do an ket cau thep 2
TRANSCRIPT
-
8/12/2019 Do an ket cau thep 2
1/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 1
MC LCPHN I: S LIU BI
1. SLIU CHUNG2. SLIU RING
PHN II: XC NH KCH THC KHUNG NGANG.
1. CU TRC2. XC NH KCH THC THEO PHNG NG3. XC NH KCH THC THEO PHNG NGANG4. XC NH KCH THC CHNH CA KHUNG NGANG
PHN III: XC NHTI TRNG TC DNG LNKHUNG NGANG.
1. TI TRNG THNG XUYN2. TI TRNG SA CHA MI3. P LC CU TRC LN VAI CT4. LC X NGANG CA CU TRC5. P LC GI
PHN IV: XC NHNI LCKHUNG NGANG.
1. TNH TI2. HOT TI3. P LC NG Dmax V Dmin4. LC X NGANG T5. TI GI
PHN V: T HP NI LC.1. BNG TM TT NI LC TRONG KHUNG2. BNG THP NI LC TRONG KHUNG
PHN VI: THIT K CT.
1. THIT KCT TRN2. THIT KCT DI3. THIT KCC CHI TIT CT4. TNH TON CHN CT
PHN VII: THIT K DN MI.
A. TNH NI LC THEO PHNG PHP GIN CRMNA1. S V KCH THC CHNH CA DN2. TI TRNG TC DNG LN DN3. TNH TON NI LC TRONG DN4. TNH TON CHN CT
B. TNH NI LC THEO PHN MM SAP 2000C. NHN XT- CHN PHNG N TNH TON THANH DND. TNH TON CC THANH DN1. XC NH CHIU DI TNH TON CC THANH DN2. CHN TIT DIN CC THANH DN3. TNH DN PHN NH4. TNH TON CC CHI TIT TRONG DN
-
8/12/2019 Do an ket cau thep 2
2/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 2
PHN I:
S LIU BI
1. SO LIEU CHUNG:1 a iem xay dng:
2 Quy mo cong trnh: + Nha cong nghiep mot tang, 1 nhp. Bc cot eu nhau =6m.
+ Mai dung panel ( Be rong tap mai 1.5m) lp tren dan thep. o doc mai i= 1/10
+ Cau truc hai moc, lam viec che o trung bnh
+ Vat lieu thep CT3, Que han E42A, bulong t thep o bn thuoc lp 4.6 ( hoac lp 4.8).
Mong be tong mac 300.
3 a hnh: Thuoc a hnh B ( tng oi trong trai)
2.
SO LIEU RIENG:
Sliu tnh toan :
-Nhp : L = 30 m.-Sc truc : Q = 50/10 T.-Cao trnh ray : Hr= 9.0 m.-Bc khung : B = 6 m.-Chieu dai nha : L = 84 m.-Vung gio IA q0= 55daN/m2
Q=50/10T
2200
+16.900m
15400
0.00m
-0.60m
+19.700m
+15.400m
+13.200m
+9.65m
+8.700m
30000
M? T C? T NGANG CNG TRNH TL 1/200
Q=50/10T
4500
87
00
+19.100m
3000 3000 3000 3000 3000 3000 3000 3000 3000 3000
i=10% i=10%
Nhp nha L (m) Chieu cao nh ray Hr(m) Sc trc Q (kN)
30 9.0 500/100
-
8/12/2019 Do an ket cau thep 2
3/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 3
PHN II:
XC NH KCH THC KHUNG NGANG
1.CU TRC:Q = 50/10T, ch bnh thng, nhp nh xng 30 m, tra bng ta c cu trc :
-Loi ry : KP-80.-Chiu cao : Hct= 3150 mm.-B rng ca cu trc : Bct= 6650 mm.-Nhp cu trc : Lct= 28.5 m.-Khong cch gia hai trc bnh xe ca cu trc : K = 5250 mm.-Kch thc t tim ry n mp ngoi : B1= 300 mm.-Pmax= 490 KN.-Pmin= 145 KN.-Gxe = 180KN.-Gct = 770 KN.2.XC NH KCH THC THEO PHNG NG :
-Cao trnh nh ray Hr= 9.0 m.-S b chn chiu cao ca ray v m : hr= 0.2 m.-Chiu cao ca dm cu trc chy :hdct=
10
1
8
1B =
10
1
8
1x 6 = (0.75 0.6) Chn hdct= 0.75 m.
-C mng bng cao trnh nn hm= 0.6mChiu cao thc ca phn ct di :
Hd= Hr+ hmhrhdct= 9.0 + 0.60.20.75 = 8.65 m.
-Chiu cao gabarit ca cu trc : H= 3.15 m.-Khe h an ton : 0.1 m.-vng ca kt cu mi : f = 0.3 (khong 1/100 nhp)
Chiu cao thc ca phn ct trn :
-Ht= hr+ hdct+ Hk+ 0.1 + f = 0.2 + 0.75 + 3.15 + 0.1 +0.3 = 4.5 m.Nh vy, lm trn ta ly : Ht= 4.5 m, Hd= 8.7 m.
3.XC NH KCH THC THEO PHNG NGANG:
-Nhp nh xng : L = 30 m.-Nhp cu trc : Lk= 28.5 m.-Kch thc phn u cu trc : B1= 0.3 m.
-
8/12/2019 Do an ket cau thep 2
4/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 4
-Khe h an ton gia mt cu trc v mp trong ct trn : D = 0.06 m.Khong cch t tim ray n trc nh v :
2
LL k
= 0,75 mm-Chn s b b rng phn ct trn :-ht=
11
1
10
1Ht=
11
1
10
1x 4.5= 0.45 0.409.
Ta chn ht= 0.45 m (bi s ca 0.25 m).
-Khong cch t trc nh v ti mp ct ngoi:DBha 1t = 0.45 + 0.3 + 0.060.75 = 0.06 m.
Ta chn a = 0.25 m (trc nh v trng vi tim ct trn)-B rng ct di : 125.075.0ah d m.-kim tra li theo yu cu cng ca khung -hd
11
1
10
1Hd= 0,1 m 0,09 m
-hd 1/20 (Ht+ Hd) = 0,855 m (tha yu cu )
4.XC NH KCH THC CHNH CA KHUNG NGANG:
Q=50/10T
2200
+16.900m
15400
0.00m
-0.60m
+19.700m
+15.400m
+13.200m
+9.65m+8.700m
30000
M? T C? T NGANG CNG TRNH TL 1/200
Q=50/10T
4500
8700
+19.100m
3000 3000 3000 3000 3000 3000 3000 3000 3000 3000
i=10% i=10%
-
8/12/2019 Do an ket cau thep 2
5/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 5
*Cu to dn:Chiu cao du dn bng 2200 (mm), dc cnh trn i=1/10
* H ging:a. H ging mi* Ging cnh trn:.
* Ging cnh d-i:
i=10% i=10%
3000 3000 3000 3000 3000 30003000300030003000
30000
2200
2200
6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000600084000
0.0
0m
-0.5
5m
30000
H? GI? NG CNH THU? NG- TL 1/500
31 2 4 6 7 98 10 1211 13 145 15
A
B
6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000600084000
0.0
0m
-0.5
5m
30000
H? GI? NG CNH H? -TL 1/500
31 2 4 6 7 98 10 1211 13 145 15
A
B
-
8/12/2019 Do an ket cau thep 2
6/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 6
* H ging ng:
b. H ging ct
84000
6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 60006000
H? GI? NG ? NG TL 1/500
31 2 4 6 7 98 10 1211 135 14 15
3700
2200
31 2 4 6 7 98 10 1211 135
H? GI? NG C? T TL 1/500
6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000
14 15
4500
8700
-
8/12/2019 Do an ket cau thep 2
7/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 7
PHN III:
XC NH TI TRNG TC DNG LN KHUNG
NGANG1.TI TRNG THNG XUYN:a.Trng lng mi :
dc mi : i =10%
cos = 0.995
Trng lng do cc lpmi
Ti trng tiuchun (daN/m2)
H svt ti
Ti trng tnh ton(daN/m2)
1. Tm panen b tng ctthp c ln
150 1.1 165
2. Lp b tng nh cchnhit dy 4 cm
40 1.2 48
3. Lp chng thm 2 giy3 du
10 1.2 12
4. Lp va t trt tngchiu dy 4 cm
80 1.2 96
5. Hai lp gch l nem milp dy 3 cm
120 1.1 132
Tng ti trng 400 453
Trng lng kt cu mi v h ging c ly nh sau: g tt1= nxgtc
1= 1.2x30=36 (daN/m2)
Trng lng kt cu ca mi: gtt2= n x gtc
2= 1.2x15=18 (daN/m2)
2.TI TRNG SA CHA MI :Theo tiu chun Vit Nam v ti trng v tc ng TCVN 2737 -1995, ti trng sa cha mi lp
panen btng ct thp c ly bng 75daN/m2mt bng nh, gi thit dc mi nghing l 1/10Hay ni cch khc mi nghing 1 gc 6.Gi tr ti sa cha mi a vo tnh ton l :
pc= 75 daN/m2.
n =1.3
' c0
1.3 75p n.p 98
cos6
daN/m2.
Ti sa cha mi dn v mt khung thnh ti phn b u
P = P` * B = 98 * 6 = 588 (daN/m) = 5.88 (KN/m).
-
8/12/2019 Do an ket cau thep 2
8/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 8
Tnh ti tc dng ln dn :
Chn hck= 0.7 m.
Gbc+ck= 2* (165 + 44 * 0,7) / 27 = 14,50 daN/m2.
Tnh ti : )gggg.(Bg ckbcctdm = 12 x (455.27 + 21.38 + 13,2 + 14,50) = 6052,2daN/m2.
Hot ti tc dng ln ct :
P = P` * B = 105 * 6 = 1260 daN/m2.
3.P LC CU TRC LN VAI CT:p lc cu trc ln vai ct c tnh theo cng thc sau :
Dmax= n.nc.Pmax. iy
Dmin= n.nc.Pmin. iy
Vi + n=1.1 l h s vt ti
+ nc= 0.9 l h s thp, xt n xc xut xy ra ng thi ti trng ti a ca 2 cu trc hotng cng nhp.
Theo Catalogue ta c pmax= 490 KN, Pmin=145 KN
Hoc c th tnh gi tr ca pminnh sau:
Tng trng lng cu trc G=770 KN, s lng bnh xe mt bn ray n0=2.
Pmin=0
500 770 490 1452max
Q GP
nKN.
Sp xp cc bnh xe cu trc trn ng nh hng nh sau:
Y2= 1
Y3= 0,676Y1= 0.125
y4= 0
P1 P2 P3 P4
5000 1300 5000
6000 6000
Y1
Y2 Y3
1000 5000 1300 4700
300
-
8/12/2019 Do an ket cau thep 2
9/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 9
tnh c cc gi tr y ny ta da vo cc tam gic ng dng
1 0.125 0.676iy =1.892
Suy ra :
Dmax= m.nc.Pmax. iy =1.1x0.9x490x1.892= 917.809 (kN)
Dmin= m.nc.Pmin. iy =1.1 x0.9x145x1.892= 217.597 (kN)
4.LC X NGANG CA CU TRC:Tng lc hm tc dng ln ton cu trc l: '0 . .
xems xe
xe
Q GT f n
n
Trong :
- Q : l sc trc =500 KN- Gxe: trng lng ca xe con=180KN- nxe=4 : s bnh xe ca mt xe con- fms: lc ma st gia mc cu v cu trc ( ly bng 0.2) 0 500 180 0.2 24T x x =68 KN
Lc hm tiu chun ln mt bnh xe ca cu trc:
T1= 0
0
6834
2
T
nKN.
Vy lc x ngang ca cu trc l:
T= n.n1.T1. iy =1.1x0.9x34x1.892=63.685 KN.
Lc x ngang ny t cao trnh mt trn ca dm cu chy, cch vai ct 0.75m, lc l cao trnh9.45m.
5.P LC GI:Ti gi tc dng ln 1 khung c xc nh theo cng thc: q=n.c.k.q0.B
Trong : q0 : p luc gi tiu chun=55 daN/m2.
: n0:H s vt ti, ly bng 1.3
: C : H s kh ng
Ti gi tc dng ln khung gm 2 phn :
- Tp trung : t ti y v ko.
- Phn b : di y v ko.
-
8/12/2019 Do an ket cau thep 2
10/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 10
a.Ti trng tp trung ti y v ko :
Cao trnh y v ko : H = 13.2 mKb= 1.0512
Cao trnh nh v ko : H = 13.2 + 2.2 + 1.5 + 2.2 + 0.5 = 19.7 m KT= 1.127
Trong khong t cnh di dn n nh mi h s k c ly trung bnh 2 gi tr trn v bng 1.0891
Ti gi tp trung ti y v ko :
ii0 h.C.B.K.q.nw
dw 1.3 55 1.0891 6 (0.8 2.2 0.6 0.9 0.7 2.2 0.8 0,6)
dw = 1065.27 daN = 10.653 kN
hw 1.3*55*1.0891 6 (0.6 0.5 0.6 2.2 0.6 0,9 0.6 2.2)
hw = -1611.92 daN = 16.1192 kN
b. Ti trng phn b u (trn ct) :Gi y:
C.B.K.q.nq 0
q 1.3 0.8 1.0512 55 6 360.772 daN / m 3.608 kN / m
Gi ht:
'0
' C.B.K.q.nq
'q 1.3 0.6 1.0512 55 6 270.579daN / m 2.71kN / m
+19.100m
C1= -0.6
0.8
qd
-0.5
-0.6
-0.6
-0.6-0.8
0.7
qh-0.6
W
0.8
W
8700
4500
2197
1789
1580610
+16.900m
+19.700m
+15.400m
+13.200m
+8.700m
30000
-
8/12/2019 Do an ket cau thep 2
11/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 11
PHN IV:
XC NH NI LC KHUNG NGANG
thit lp s tnh cho khung ngang 1 cch n gin, ta gi thit:
Thay th ct bng cu kin thanh trng ci tim ct, c cng bng cng ct. Ct trn v ctdi c nn ng trc cng thm 1 moment lch tm ti vai ct. Thay th dn bng 1 thanhtrng vi cnh di dn.
Khi ti khng tc dng trc tip ln x, coi cng x bng v cng EJ = 00.
Gi s t l cng gia cc tit din trong thanh l :
cd
ct
j
j
= 8 ; d
ct
J
J
= 30 ( Chn s b)
1.TNH TI:
S tnh
Ton b tnh ti tc dng ln khung nh sau:q =B(qtt+gtt1+g
tt2/3)=6x(453+36+6)=2970 (daN/m)= 29.7 KN/m.
Lc dc trong ct trn khung bng:
q.L 2.97 30N 445.52 2 KN.
Moment lch tm t ti vai ct: M lt=N2x e =445.5x0.275=122.65 (KNm)
Ta c cc thng s sau tra bng:
4.50.34
4.5 8.7t
t d
Ha
h H Hv n= 2
1
10.125
8
J
J
Tra bng v ni suy ta c: KB= -0.6897 v KB= 1.4535.
Gii bi ton bng phng php chuyn v vi phng trnh chnh tc nh sau:
11 1. 0Pr R
Gii bi ton trn thnh 2 bi ton nh sau:
e=0.275
29.7 KN/m
4500
8700
30000
-
8/12/2019 Do an ket cau thep 2
12/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 12
Xt bi ton BT1:
a) Ni lc do chuyn v xoay 1 gy ra trn h c bn:- Moment v lc ct ti nh ct:
. . .0.6897B cd cdB
K E J E JM
h h v
'
2 2
. . .1.4535B cd cdB
K E J E JQ
h h
- M men v lc ct ti vai ct
.C B B t M M Q h =.
0.6897 cdE J
h-0.6897+ 2
.1.4535 cd
E J
hx4.5=0.585105 2
.cd
E J
h
- M men v lc ct chn ct
.A B BM M Q h =-0.6897+ 2.
1.4535 cdE J
hx13.2=0.7638
2
.cd
E J
h
A BQ Q - M men trong thanh x ngang:
4. . 3.75 15. . 6. .4d cd d d BC
E J Ex J E J E JM
L L L h
b) Moment do ti ngoi gy ra trong thanh x:2
2227.5( . )12
q
BC
qlM KN m ;
2
1113.75( . )24
q
Nhip
qlM KN m
Cc h s r11v R1Pc th xc nh nh sau:
r11= ( 0.6897) ( 6.6) 7.2897cd cd B BCEJ EJ
M Mh h
R1P= - BM =-2227.5 KNm
111
305.568P
cd
R h
r EJ
T ta tnh ra c gi tr ni lc cui cng:
29.7 KN/m
HCB 1 HCB 2122.65 KNm122.65 KNm
V
2227.5KNm2227.5 KNm
1113.75 KNm
-
8/12/2019 Do an ket cau thep 2
13/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 13
- Gi tr moment chn ct:0.7638 305.568.
233.393( )cdPA
cd
EJ hM x KNm
h EJ
- Gi tr moment nh ct:0.6897 305.568. 210.750( )cdPB
cd
EJ hM x KNmh EJ
- Gi tr moment u dn:6.6 305.568.
2227.5 210.751( )cdBC
cd
EJ hM x KNm
h EJ
- Gi tr moment gia dn:2 229.7 30
210.71 3130.499( )8 8nhip BC
ql xM M KNm
Biu mmen cui cng:
Xt bi ton BT2:
T cc thng s =0.34,x
h=
4.5
13.2=0.34 v n=0.125, tra bng ta c:
'
0.16118
1.4915B
B
k
k
- Momen v phn lc nh ct c xc nh nh sau:MB= KB.Mlchtm=-0.16118x(-122.65)=19.77 (KNm)
' 122.651.4915 13.8613.2
lechtamB B
MQ K xh (KN)
- Mmen ti chn ct trn:MII=MB+QB.Ht=19.77-(13.86x4.5)= -42.6 (KNm)
- Mmen ti nh ct di:MIII= -Mlechtam+MII=122.6- 42.366 =80(KNm)
- Momen ti chn ct:MA= MII+ QB.Hd= 80-(13.86x8.7)=-40.58 (KNm)
M0P
29.7 KN/m
29.7 KN/m
29.7 KN/m
-
8/12/2019 Do an ket cau thep 2
14/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 14
Cng kt qu 2 bi ton trn ta thu c biu moment gy ra do tnh ti:
Biu mment do tnh ti
Lc ct ti chn ct196.07 11.632
21.28.7
TT
AQ (KN)
2.HOT TI :
Tnh tng t trng hp tnh ti, vi qht= 5.88KN/m. Nh vy ch cn nhn cc tung biu
moment ca trng hp tnh ti vi t s5.88
0.19829.7
ht
tt
q
q
Biu moment nh sau:
40.58 KN/m
80 KN/m
19.77 KN/m
38.296 KN/m
M0P
190.98 KN/m
101.93 KN/m
192.81 KN/m
20.67 KN/m
38.209KN/m
19.531KN/m
38.82 KN/m
2.303 KN/m
-
8/12/2019 Do an ket cau thep 2
15/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 15
Lc ct ti chn ct 0.198 0.198 21.2 4.19( )HT TTA AQ Q x KN
3. P LC NG Dmax V Dmin:
Tng t nh trn bi ton cng c a v thnh 2 bi ton
- Bi ton 1: vi ct chu nn ng tm Dmax v Dmin (ch gy ra lc dc trong ct di chkhng gy ra moment).- Bi ton 2: vi cc moment Mmaxv Mmin( do Dmaxv Dmint lch tm ) gy ra ti vai ct.Cc moment lch tm:
Mmax=Dmaxx e=917.809x0.5=458.905 (KNm)
Mmin=Dminx e=217.597x0.5=108.799 (KNm)
a. Mment do ti trng ngoi gy ra trn h c bn:Tng t nh trng hp tnh ti:
-
Moment v phn lc nh ct c xc nh nh sau: MB= KB.Mlchtm=-0.16118x(458.905)= -73.966 (KNm)
' 458.9051.4915 51.8513.2
lechtamB B
MQ K x
h(KN)
- Mmen ti chn ct trn:MII=MB+QB.Ht=-73.966+51.85x4.5= 159.359 (KNm)
- Mmen ti nh ct di:MIII= -Mlechtam+MII=-458.905+159.359 = -299.546(KNm)
- Momen ti chn ct:MA= MII+ QB.Hd= -299.546+51.85x8.7= 151.549 (KNm)
Biu moment cho trng hp ny nh sau:
b. Ni lc do chuyn v thng n v gy ra trn h c bn:T ph lc ta tnh c cc h s KB=1.4535 v KB=-5.52095.
T :
2 2
. .. 1.4535cd cd BE J E J
M Kh h
'3 3
. .. 5.52095cd cd B B E J E JQ Kh h
4.067
0.429
17.536 KN/m1.453 1.453
4.067
0.429
73.966 KN/m
299.546 KN/m
159.359 KN/m
151.549 KN/m 35.893 KN/m
37.769 KN/m
71.03 KN/m
M Mp
-
8/12/2019 Do an ket cau thep 2
16/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 16
'2 2 2
. . .. ( ) 4.06745cd cd cd A A B BE J E J E J
M K K Kh h h
Xc nh h s r11v R1p:
Ct thanh dn v chiu tt c cc lc tc dng ln phng ngang ta xc nh c r11nh hnh v.Tng t ta cng xc nh c R1p:
R1P=-51.85+12.29=-39.56 (KN)
n chuyn v thng: 3 3111
39.563.58
11.0419P
cd cd
R h h
r EJ EJ
Vy moment trong h ban u:Ct tri:
- Moment ti nh ct: 0 1. 73.966 3.58 13.2 1.4535 5.28( )Bp PM M M x x KNm - Moment ti chn ct trn:
01. 159.359 3.58 ( 0.4286) 13.2 139.105( )
II
p PM M M x x KNm
- Moment ti nh ct di: 458.905 139.105 319.8( )III IIp lt PM M M KNm - Lc ct: 0 . 51.85 3.58 2.52095 32.085( )p BQ Q Q x KN - Moment ti chn ct: 0 . 151.549 4.06745 13.2 3.58 40.66( )Ap AM M M x x KNm
Ct phi:Tnh ton tng t nh trng hp trn ta c bng kt qu sau:
Q(KN) M (KNm)nh ct Chn ct trn nh ct di Chn ct
-7.475 -86.22 17.515 -91.287 228.10Cui cng ta c biu moment do Dmaxv Dmingy ra nh sau:
40.66 ( 319.8)0.198 17.19( )
8.7HT TT
A AQ Q KNm
r11=11.0419 EJcd/h3
R1p
5.52095EJcd/h3
5.52095 EJcd/h3 51.85 12.29
86.22 KN/m5.28 KN/m
319.8 KN/m
139.05 KN/m
40.66 KN/m 288.10 KN/m
17.515 KN/m
91.287 KN/m
Bi?u d? moment do Dmaxv Dmin
-
8/12/2019 Do an ket cau thep 2
17/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 17
T
MB= 0.1088 T.h
QB= 0.68597 T
4. LC X NGANG T :
S tnh:a) Ni lc do chuyn v n v gy ra trn h c bn:
Cc h s =0.34,x
h=
3.75
13.2=0.284 v n=0.125, tra bng ta c:
'
0.1088
0.68597B
B
k
k
b) Biu bao moment do ngoi lc gy ra trn h c bn 0PM :- Moment u ct:
MI=KBxTxh = -0.1088x63.685x13.2=-91.46 (KNm)
- Moment ti vtr t lc x ngang:Mx=MI+QBx X=-91.46+0.68597x63.685x3.75=72.36 (KNm)- Moment chn ct;
MIV=MI+ QB.h-T.(h-x)=-91.46+0.68597x63.685x13.2-63.685.(13.2-3.75)=-116.63 (KNm).
3.7
5
m
0.7
5m
13.2m
T= 63.685 KN
-
8/12/2019 Do an ket cau thep 2
18/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 18
Xc nh h s r11v R1p:
Ct thanh dn v chiu tt c cc lc tc dng ln phng ngang ta xc nh R1p:R1P= -43.69(KN)
n chuyn v thng: 3 3111
43.693.96
11.0419P
cd cd
R h h
r EJ EJ
Vy moment trong h ban u: 0 1.B
p PM M M
C th:Ct tri:
- Moment ti nh ct: 30 1 2. 91.46 3.96 1.4535 15.48( )cdB Pcd
EJhM M M x KNm
EJ h
- Moment ti v tr t lc x ngang:3
01 2. 72.36 3.96 ( 0.4286) 49.96( )
cdC P
cd
EJhM M M x KNm
EJ h
- Moment ti chn ct:3
01 2. 116.63 3.96 ( 4.06745) 329.24( )
cdA P
cd
EJhM M M x KNm
EJ h
Ct phi:
- Moment ti nh ct: 30 1 2. 0 3.96 1.4535 75.98( )cdB Pcd
EJhM M M x KNm
EJ h
- Moment ti v tr t lc x ngang:3
01 2
. 0 3.96 ( 0.4286) 22.40( )cdC Pcd
EJhM M M x KNm
EJ h
Moment ti chn ct:3
01 2. 0 3.96 ( 4.06745) 212.61( )
cdA P
cd
EJhM M M x KNm
EJ h
Biu moment nh sau:
116.63 KNm
24.74 KNm
91.46 KNm
4.067 4.067
0.429
1.453 1.453
4.067
0.429
M
R1p
43.69
-
8/12/2019 Do an ket cau thep 2
19/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 19
+
-
-
5. TI GI :
Ni lc c tnh theo s nh sau:
a. Ni lc do chuyn v n v gy ra trn h c bn: Cc h s =0.34, v n=0.125, tra bng ta c:
'
0.05032
0.44322B
B
k
k
20.05032
0.44322B
B
M qh
Q qh
b. Biu moment do ngoi lc gy ra trn h c bn 0BM :Pha gi y:
- Moment u ct:2 2. . 0.05032 3.608 13.2 31.63( )dI B dM K q h x x KNm - Moment chn ct trn v nh ct di:
329.24 KNm
23.045 KNm
15.48 KNm
102.32 KNm
49.96 KNm 22.40 KNm
22.42 KNm
75.98 KN
qd
Wd
qh
So d? tnh
Wh
-
8/12/2019 Do an ket cau thep 2
20/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 20
2 2. 3.608 4.5. 31.63 0.44322 3.608 13.2 4.5 26.83( )
2 2d d d t
II III I B t
q H xM M M Q H x x x KNm
- Moment chn ct:2 2. 3.608 13.2
. 31.63 0.44322 3.608 13.2 13.2 67.33( )2 2
d d
IV I B
q h xM M Q h x x x KNm
Tng t i vi pha ht gi (qh=2.71KN/m) ta c kt qu sau:
MA(KNm) MB(KNm) MC(KNm)
23.76 20.15 50.57
Biu mment gy ra trn h c bn
Xc nh h s r11v R1p:
trng hp trn ta xc nh c r11=11.0419 3cdEJ
h
Ct thanh dn v chiu tt c cc lc tc dng ln phng ngang ta xc nh R1p:R1p=21.11+15.85+10.65+16.12=63.73(KN)
n chuyn v thng:
3 31
11
63.73
5.7711.0419P
cd cd
R h h
r EJ EJ
Vy moment trong h ban u: 0 1.B
p PM M M
C th:Ct tri:
- Moment ti nhct:3
01 2
. 31.63 5.77 1.4535 79.07( )cdB Pcd
EJhM M M x KNm
EJ h
- Moment ti chn ct trn v nh ct:30
1 2. 26.83 5.77 ( 0.4286) 5.8( )cdC P
cd
EJhM M M x KNmEJ h
67.33 KNm
26.83 KNm
31.63 KNm
50.57 KNm
20.15 KN
23.76 KNm
Mp
R1p
21.11
10.65
15.85
16.12
-
8/12/2019 Do an ket cau thep 2
21/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 21
- Moment ti chn ct:3
01 2
. 67.33 5.77 ( 4.06745) 377.12( )cdA Pcd
EJhM M M x KNm
EJ h
Ct phi:
- Moment ti nh ct: 30 1 2. 23.76 5.77 ( 1.4535) 86.94( )cdB Pcd
EJhM M M x KNmEJ h
- Moment ti chn ct trn v nh c di:3
01 2
. 20.15 5.77 ( 0.4286) 12.49( )cdC Pcd
EJhM M M x KNm
EJ h
Moment ti chn ct:3
01 2
. 50.57 5.77 ( 4.06745) 360.36( )cdA Pcd
EJhM M M x KNm
EJ h
Biu moment cui cng nh sau:
MTRMPH
377.12 KNm
5.8 KNm
79.07 KNm
360.36KNm
12.49 KNm
86.94 KNm
377.12 KNm
5.8 KNm
79.07 KNm
360.36KNm
12.49 KNm
86.94 KNm
-
8/12/2019 Do an ket cau thep 2
22/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 22
PHN V:
T HP NI LC
1. BNG TM TT NI LC TRONG KHUNGTitdin
Hs
TH
Tnh ti(1)
Hot ti mi(2)
Dmaxtri(3)
Dmax phi(4)
T tri(5)
T phi(6)
G. Tri(7)
G.Phi(8)
M(KNm)
N(KN)
M(KNm)
N(KN)
M(KNm)
N(KN)
M(KNm)
N(KN)
M(KNm)
M(KNm)
M(KNm)
M(KNm
)I-I 1 -190.8 446 -38.21 88.2 -5.28 0 -86.22 0 15.48 75.98 79.07 -86.94
0.9 -190.8 446 -34.39 79.38 -4.752 0 -77.598 0 13.932 68.382 71.163 -78.246
II-II 1 -101.93 446 -19.53 88.2 139.23 0 17.52 0 20.05 22.42 -5.6 12.49
0.9 -101.93 446 -17.42 79.38 125.307 0 15.768 0 18.045 20.178 -5.04 11.241
III-III
1 20.67 446 2.30 88.2 -319.8 917.81 -91.29 217.6 20.05 22.42 -5.6 12.49
0.9 20.67 446 2.07 79.38 -287.82 826.029 -82.161 195.84 18.045 20.178 -5.04 11.241
IV-IV 1 192.81 446 38.82 88.2 -40.66 917.81 228.10 217.6 329.24 212.61 -377.12 360.36
0.9 192.81 446 34.938 79.38 -36.594 826.029 205.29 195.84 296.316 191.349 -339.408 324.304
2. BNG T HP NI LC TRONG KHUNGT hp I
Tit din Mmax-Nt Mmin-Nt NmaxMtM(KNm) N(KN) M(KNm) N(KN) N(KN) M+(KNm) M-(KNm)
I-I 1+8 1+2-277.92 446 534.2 -122.77
II-II 1+3 1+2 1+237.3 -129.46 534.2 534.2 -129.46
III-III 1+8 1+3 1+333.16 446 -299.13 1368.81 1363.81 -299.13
IV-IV 1+8 1+7 1+3553.17 446 -184.31 446 1363.81 152.15
T hp II
Titdin
Mmax-Nt Mmin-Nt NmaxMt
M(KNm) N(KN) M(KNm) N(KN) N(KN) M+(KNm) M-(KNm)I-I 1+2+4+6+8 1+2 +4+6+8
-449.596 525.38 525.38 -449.596II-II 1+3+6+8 1+2+7 1+2 +3+6+8 +7
54.796 446 -124.39 525.38 525.38 37.376 -124.39III-III 1+2+8 1+3+6+7 1+2+3 +6+7
33.981 525.38 -333.708 1272.029 1351.409 -290.298
IV-IV 1+2+4+5+8 1+3+5+7 1+2+3 +5+8 +5+71053.658 721.22 -479.508 1072.029 1351.409 811.774 -444.57
-
8/12/2019 Do an ket cau thep 2
23/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 23
PHN VI:
THIT K CT
Ht =3.2m, ht= 0.45m
Hd=9.9m, hd= 1.0m
T s m men qun tnh ca tit din phn ct : 8J
J
t
d
Ni lc tnh ton : t bng t hp ni lc
+ Ct trn : cp ni lc nguy him nht :
M = - 449.596 kNm
N = 525.38 kN
+ Ct di :
M 479.508kNm; N 1072.029kN
M 1053.658kNm; N 721.22kN
T s lc nn ln nht ca phn ct di v phn ct trn :
d
t
t d
1
d t
2 t d
1
1 t d
N 1072.029
m 2.04N 525.38
H J 4.5 8C 1.024
H mJ 8.7 2.04 1
i J J 1 8K : : 0.242
i H H 4.5 8.7
Tra bng II.6a theo 2 thng s C1, K1v ni suy ta c1
2.014
12
1
2.0141.967
1.024C
Chiu di tnh ton trong mt phng khung :
1x 1 d
2x 2 t
l H 2.014 8.7 17.522m
l H 1.967 4.5 8.85m
Chiu di tnh ton ngoi mt phng khung :
1y d
2y t dct
l H 8.7ml H h 4.5 0.75 3.75m
1. THIT K CT TRN:
-
8/12/2019 Do an ket cau thep 2
24/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 24
15
300
450
12
15
Chn tit din hnh ch H i xng t 3 bng thp
Ta c lch tm :
449.5960.86 86
525.38
Me m cm
N
S b chn tit din :
yct
N eF 1.25 2.2 2.8
R h
525.38 861.25 2.2 2.8 136.5 165.15 cm
21 1 45
= 1.25 : h s nh hng hnh dng tit din
R = 21kN/cm
2
: cng thit k ca vt liu thp.Chn :
b t
c c
c t
1 11.2cm h
30 50
1 11.5cm b
20 36
1 1b 30cm h
12 15
bh 45cm; h 42cm
ch
a 21.75cm2
Kim tra :
2c
2b
2c b
F 2 1.5 30 90cm
F 1.2 42 50.4cmF F F 140.4cm
3 32b b c c
x c c
3 32 4
h bJ 2 a b
12 12
1.2 42 30 1.52 21.75 1.5 30 50001cm
12 12
-
8/12/2019 Do an ket cau thep 2
25/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 25
3 3c c b b
y
3 34
2 b hJ
12 12
2 1.5 30 42 1.26756cm
12 12
y
y
xx
3xx
t
J 6756r 6.94cm
F 140.4
J 50001r 18.87cm
F 140.4
2J 2 50001w 2222cm
h 45
2yy
y
2xx
x
l 375 54.03r 6.94
l 88546.90
r 18.87
Nh vy max 54.03 120
lch tm tng i m :
x
e F 86 140.4
m 5.4W 2222
Vi :
3
x x 6
R 2.1 1046.9 1.48
E 2.1 10
3
y y 6
R 2.1 1054.03 1.71
E 2.1 10
Ta c : cxb
F 901.25 5; 5 m 5.5 20; 1.79F 50.4
tra bng II.4 -ph lc II ta c :
1
1.4 0.02 1.4 0.02 1.48 1.37
m m 1.37 5.4 7.398
Ct khng cn kim tra bn v yc 1F F; m 20
* Kim tra n nh tng th trong mt phng un :
x 1.48 v m1= 7.398 tra bng II.2 -ph lc II ta c h s lt 0.180
2
lt
N 525.3820.78kN / cm
F 0.180 140.4(tha < 21 kN/cm2)
-
8/12/2019 Do an ket cau thep 2
26/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 26
* Kim tra n nh tng th ngoi mt phng un :
Ta c M2= - 449.596 ng vi t hp 1,2,4,6,8 ti mt ct B ng vi u kia ta c m men tng
ng :
1M 101.93 17.42 15.768 20.178 11.241 112.519kNm
M men 1/3 on ct :
1 2'2
112.519 449.596449.596 337.237
3 3
M MM M kNm
Ta c : ' '2 1max , , 337.2372 2
M MM M kNm l gi tr m men a vo tnh ton.
lch tm tng i :
' 2
xx
M F 337.237 10 140.4m 4.06N W 525.38 2222
Vi mx= 4.06 < 5 tra bng II.5 -ph lc II ta c x0.65 0.005 m 0.67
Vi y CE
54.03 3.14 97R
tra bng II.5 -ph lc II ta c 1
H s nh hng ca m men trong mt phng un C c xc nh nh sau:
2
1C 0.269
1 m 1 0.67 4.06
y 54.03 ta tra bng II.1 -ph lc II y 0.849
Kim tra n nh tng th ca ct trn ngoi mt phng theo cng thc :
2 2y
y
N 525.3816.385kN / cm 21kN / cm
C F 0.269 0.849 140.4
* Kim tra n nh cc b :
- Bn cnh :
o C bC
C
b b 30 1.2: :1.5 9.62 2
Mc khc, theo bng 3.3 ta c i vi thp I c 48.0 x th
6o
3C
b E 2.1 100.36 0.1 0.36 0.1 1.25 15.34
R 2.1 10
Vy
C
o
C
o bb bn cnh tho mn iu kin n nh cc b.
-
8/12/2019 Do an ket cau thep 2
27/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 27
- Bn bng :
V kh nng chu lc ca ct c xc nh theo iu kin n nh tng th trong mt phng khung nn
t s gii hnb
oh xc nh theo bng 3.4
Vi :
o
b
6
3
m 4.06 1 h E0.9 0.5
R1.48 0.8
2.1 100.9 0.5 1.48
2.1 1048.22
Tit din chn c :
o o
b b
h 45 2 1.5 h35 48.22
1.2
bn bng tho mn iu kin n nh cc b.
2. THIT K CT DI:Thit k ct di c:
2 cp ni lc nguy him. M1=1053.658 KNm ; N1=721.22 KN.
M2=-479.508 KNm ; N2=1072.029 KN.
0
479.508 1072.0291015.5
2 1 2tu
ct
NMN KN
h
0
1053.658 721.221414.268
2 1 2tu
mai
NMN KN
h
Cp M1cho Nnhnhln hn nn ta dng tnh ctNi lc tnh ton tit din I-I chn ct l:
Trng lng bn thn ct:
- Phn ct trn: G2=A.ht. =140.4x10-4x4.5x78.5=4.96KN.- Phnct di:
G1=2
37
721.22 10. . 7.85 10 1.4 8.7
. 0.5 2.1 10dN x
h x x x xK R x x
=660 daN=6.6KN
- Lc nn tng cng: N=1351.409+6.6+4.96=732.78 KN.a. S b chn tit din:Chiu cao tit din ct chn trc h=1.0m
-
8/12/2019 Do an ket cau thep 2
28/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 28
lch tm1053.658
1.44732.78
Me m
N
Gi thit bn knh li rx=0.48xhd=0.48x100=48cm.
mnh 1 1752.2
36.548xx
x
l
r
3
6
2.1 1036.5 36.5 1.154
2.1 10xR x
xE x
lch tm tng i: 1144
1.25 3.9130.46 100
x
em x x
x
Tra bng ph lc II-7 vi 1.154x v m1=1.6 ni suy ta c lt 0.305
Din tch cn thit:
2732.78 144.(1.25 2.5 ) (1.25 2.8 ) 185. 21 100yc
N eA x cm
R h
Chn chiu dy bn bng1 1
( ) (12.5 4)80 250b d
h mm
Chn chiu dy bn bng b =1.0mm.
Din tch bn bng 21.0 100 100bA x cm
Din tch mi nhnh ct: 2185 100
432
cm
Chn nhnh cu chy: I-30 c cc c trng hnh hc:
F=46.5 cm2;Jx=7080 cm4; Jy=337 cm
4; Wx=472 cm3.
Nhnh mi:30x1.5=45 cm2.
- Din tch bn nhnh mi:230 1.5 45c c cF b x x cm
- Din tch bn bng:298.175 1 98.175b b bF h x x cm
- Din tch nhnh cu chy:
30
0
1000
13515
491.2
2.9
501.3
1
0
I-30
-
8/12/2019 Do an ket cau thep 2
29/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 29
246.5cF cm
- Din tch ton ct:245 98.175 46.5 189.675F cm
- Khong cch t trc trng tm nhnh cu chy n trc tit din.( ) ( )
2 2 2
1.5 98.175 0.6545 (100 ) 98.175 ( )
2 2 2 49.12189.675
m bm d b
c
h dF x h F x
hF
x x
cm
- Khong cch t trc trng tm nhnh mi n trc tit din.hm= hd-hc-0.5x m =100-49.12-0.5x1.5=50.13 cm.
- Khong cch t trc trng tm bn bng n trc tit din.1.5 98.175
50.13 0.292 2 2 2
b dm
hy h cm.
- Cc moment qun tnh:3 3
2 2 2
3 32 2 2
4
( ) ( ) ( )12 12
30 1.5 1.0 98.175( 50.13 45) ( 0.29 98.175) (337 49.12 46.5)
12 12304487
d b b bx m m b xc c c
b x xhJ h xF y xF J h xF
x xx x x
cm
3 3 3
4
1.5 30 98.175 17080
12 12 12
10463
cy y
h x x xJ J
cm
Kim tra li gi thit: 1
2
30448729.1 8
10463
J
J=> m bo.
- Cc bn knh qun tnh:304487
40.07( )189.675
x
x
J
r cmF
104637.427( )
189.675y
y
Jr cm
F
- Gi tr mnh: 2 885 21.7440.07
xx
x
l
r
2 375 50.497.427
y
y
y
l
r
- mnh quy c: 36
2.1 1021.74 0.6872.1 10x x
R xx
E x
-
8/12/2019 Do an ket cau thep 2
30/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 30
3
6
2.1 1050.49 1.597
2.1 10y yR x
xE x
- Cc moment khng un:3304487 5984.4141.5
50.1322
xxm
mm
JW cm
h
3304487 4410.93713.5
49.1222
xxc
cc
JW cm
bh
- Bn knh li tit din:5984.414
31.55189.675
xmx
Wcm
F
- lch tm tng i:144
4.56431.55
xx
x
em
- lch tm quy i:1 . 1.25 4.564 5.705xm m x
Tra bng ph lc II-7 vi 0.687x v m1=5.705 ni suy ta c lt 0.244
b.Kim tra cc b bn cnh:( nhnh mi)- n nh cc b ca bn cnh phi c m bo ngay t lc chn s b tit din: t s phn
vn ra v b dy ca n l:' 0.5( ) 0.5 (30 1)
9.661.5
d b
c m
bb xnh hn tr s quy nh bn 2 l
3
6
2.1 10(0.36 0.1 ) (0.36 0.1 0.687) 13.557
2.1 10
E xx
R x
Vy bn cnh nhnh mi n nh cc b.
c. Kim tra cc b bn bng.Vi bn bng ct, v kh nng chu lc ca ct c xc nh theo iu kin n nh tng th trong mt
phng khung nn t s gii hn o
b
hxc nh theo bng 3.4.
Khi m=4.564 v 0.687x 41.11 Bn bng b mt n nh cc b, ch c mt phn chiu
rng st hai cnh cng lm vic vi cnh. Chiu rng on cng lm vic:
-
8/12/2019 Do an ket cau thep 2
31/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 31
6
1 3
2.1 100.85 0.85 1 27
2.1 10bE x
C x x x cmR x
T s thc t:6
3
2.1 1098.175 2.2 2.2 69.57
2.1 10
o
b
h E x
R x
.
Phi lm cc i sn ngang gia c bng bng.
Khong cch cc sng ngang a=2.5hb=2.5x98.175=245cm
B rng sn ngang: bs=981.75
40 72.730
mmchn bs=100mm.
Chiu dy sn:3
6
2.1 102 2 10 0.63
2.1 10s sR x
xb x x cmE x
. Chn s =8mm.
d.Kim tra n nh tng th trong mt phngkhung.Theo cng thc
.x lt
N
A
Vi lt tnh nh trn lt =0.244; A- din tch lm vic ca tit din.
A=Anhm+Anhct+2C1. b =45+46.5+2x27x1=145.5cm2.
Vy: 2732.78
20.64 .0.244 145.5x
KN
x cm < 21 2.KN
cmm bo n nh.
e. Kim tra n nh tng th ngoi mt phng khung.Cp ni lc tnh ton tit din I-I:
M1=1053.658 KNm ; N1=721.22 KN. ng vi t hp ti trng 1,2,4,5,8. Mment ng vi u kia,cng do cc ti trng 1,2,4,5,8 gy ra l:
Mc= -30.135 KNm;
Moment ln nht 1/3 chiu di ct l:
11053.658 ( 30.135 1053.658) 692.394
3M KNm.
0.5Mmax=0.5x1053.658=526.829 KNm
-
8/12/2019 Do an ket cau thep 2
32/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 32
Theo ph lc 7 ta c:
50.49y < 99.296c th =1.
V khi 1
-
8/12/2019 Do an ket cau thep 2
33/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 33
Mmax=54.796 KNm ; Ntu=446 KN.Mmin=-129.46 KNm ; Ntu=534.2 KN.
- Khong cch hai bn cnh ct trn: ' 45 1.5 43.5t t cb h cm - Ni lc ln nht m mi ni cnh ngoi ct trn phi chu:
max1'
446 54.796
2 2 0.435ngt
MNS
b349 KN.
- Ni lc ln nht m mi ni cnh trong ct trn phi chu:2 min'
534.2 129.46
2 2 0.435trt
N MS b 565 KN.
932.5 135 100
1167.5
50
50
50
30
200
450
750
500
20
20
120
15
76B?n K dy 15mm
D?m c?u ch?y80
57
36580
10
22
15
15 15
1000
300
450 650 167.5
200
300
400
1167.5
11
7
8
-
8/12/2019 Do an ket cau thep 2
34/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 34
- Ni cnh ngoi bng ng hn i u thng, chiu di ng hn bng b rng cnh cttrn, chiu cao ng hn bng chiu dy thp cnh ct trn.
- ng sut trong ng hn i u cnh ngoi: 2349 81.5 (30 0.5 2)
ngh
h h
S KN
xl x x cm
-
8/12/2019 Do an ket cau thep 2
35/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 35
- Chiu cao bn bng dm vai: phi cha 4 ng hn gc lin kt bn bng dm vai vibng nhnh cu trc.
+ gi thit chiu cao ng hn gc hh=10mm
+ Chiu di 1 ng hn cn thit l:
2 max( ) 932.809 282.51 24.114 (0.7 ) min 4 1 0.7 18
dcth
h g
D G Bl cm
xh x xR x x x
+ Chiu di 1 ng hn cn thit lin kt bn K vo bng dm vai ( 4 ng hn gc ny lin kt truyn lc Str).
2
min
5651 11.2
4 (0.7 ) 4 1 (0.7 18)
trh
h g
Sl cm
xh x xR x x x
+ iu kin hdv 0.5xhd=0.5x100=50cm. Chn hdv=50cm.
+ Chn chiu dy bn di dm vai cv =10mm.
+ Chiu cao bn bng dm vai hbdv=hdv-( bd cv )=50-(2+1)=47cm.
- Kim tra iu kin chu un ca dm vai:Tit din ch I ca dm vai khng i xng gm cnh di dm vai thng l mt bn thp nmngang ni bn bng ca hai nhnh ct di.
Cnh trn ca dm vai thng l hai bn thp ( bn y mt nhnh cu trc v bn sn lt).
c th tnh ton n gin v thin v an ton ta quan nim ch c bn bng dm vai chu un.
- Moment khng un ca bn bng:2 2
32 47 736.336 6
dv bdvxh xW cm
- Kim tra iu kin chu un ca dm vai(tit din ch nht):2
max2
141.25 1019.18
736.33
dvM x KN
W cm B= 30+2(1+4)=40cm.
-
8/12/2019 Do an ket cau thep 2
36/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 36
Chiu dibn tnh c theo gi thit ng sut ln nht ti mp bn t c cng p cc b ca btng mng theo cng thc:
2
.
6( )
2. . 2. . .m m
N N ML
B R b R B R
- Chn cp ni lc tnh tonM=1053.658 Km
N=721.22 KN
- Rn=150 2kGcm : cng chu nn ca vt liu lm mng BTCT mc 250- Rm= 33 1.50 1.2nR x =1.594 2KNcm ( = mbd
F
Fgi thit =1.2).
22721.22 721.22 6 1053.658 10( )
2 40 1.594 2 40 1.594 40 1.594
x xL
x x x x x=105.39cm
- tin li cho cu to chn ct ta chn L=150 cm.b. Tnh chiu dy bn :
- ng sut bn di bn :2
max 2 2 2
2
min 2 2 2
6 721.22 6 1053.658 100.823
. . 40 150 40 150
6 721.22 6 1053.658 100.582
. . 40 150 40 150
N M x x KN
B L B L x x cm
N M x x KN
B L B L x x cm
B dy ca bn c xc nh t iu kin chu un do phn lc mng khi tnh moment un. Titrng tng bn c xem nh phn b u v bng ng sut ln nht trong .
- Tnh ng sut nn ln nht ca btng mng di sn chn ct l: 1 max
2
0.823KN
cm
12 max min min 2
150 14( ) (0.823 0.582) 0.582 0.692
150
L a KN
L cm
1 23 max min min 2
( ) 150 (10 14)( ) (0.823 0.582) 0.582 0.5982
150
L a a KN
L cm
1 2 34 max min min 2
( ) 150 (10 14 31)( ) (0.823 0.582) 0.582 0.308
150
L a a a KN
L cm
5 max min min 2
1 1( ) (0.823 0.582) 0.582 0.121
2 2
KN
cm.
- 1: Bn lm vic nh cng sn:
-
8/12/2019 Do an ket cau thep 2
37/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 37
2 21 1
11
24 0.823 54.8 2 10.288
5 2 2cb xa xM KNcm
a.
- 2: Bn lm vic nh bn k 4 cnh: 2 2
2 2 2 22
30 2.143 . 0.125 0.729 14 17.86114
cb M xa x x KNcma
.
- 3: Bn lm vic nh bn k 3 cnh: 2 2
3 3 3 33 3
400.645 . 0.081 0.5982 31 46.564
2 2 31cb B M xa x x KNcm
a a x.
- 4: Bn lm vic nh bn k 3 cnh:2 2
4 4 4 44
401 . 0.112 0.308 20 13.798
2 20cb M xa x x KNcm
a x.
Mment dng tnh chiu dy bn l:
M= max(M1, M2, M3, M4)=46.564 KNcm.
- Chiu dy bn :6 6 46.564
3.647 421bd
M xcm cm
RChn bd =4cm=40mm.
c. Tnh dm :-
Chiu di ng hn lin kt chn ct vi dm cng chnh l chiu cao dm .- Chiu di dm : ld=24cm- Dm lm vic nh conson chu p lc phn b di bn :
300X1
0
300x15 1
0
10
O 3 O 3
O 3 O 3
O 3 O 2
O 4
O 4
O 4
O 4
O 3O 2
O 1
-
8/12/2019 Do an ket cau thep 2
38/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 38
max
400.823 16.46
2 2dB KN
q x xcm
- Momen: Md = 2 22416.46 4740.482 2
dd
lq x x KNcm
- Lc ct: Q d =q d x l d =16.46x24=395.04 KN.- Ly b dy dm
d=1cm
- Chiu cao cn thit cho tit din cu un:6 6 4740.48
36.802. 1 21d
d
d
M xh cm
R x
- Chiucao cn thit cho tit din chu ct:395.04
30.3881 13d
d
Qh cm
xR x
- Dng tit din bn dm 40x1cm chung cho c 2 nhnh- 3 2 31 1. . 1 35 266.667
6 6d d d W h x x cm
Kim tra dm :
2
4740.4817.777
266.667d
d
M KN
W cm t yu cu.
Kim tra tit din dm theo iu kin chu ct:
2
395.049.876
. 1 40d
d d
Q KN
h x cm t yu cu.
Tnh ng hn lin kt dm vo nhnh ct: Hn dm vo nhnh ct bng hai ng hn ng c chiu di ng hn l:
- Lh=h d =40cm- ng hn lin kt dm vo nhnh c hh=10mm
2 230.7 ( 1) 0.7 1 (40 1) 177.45
6 6h d
h
xh x h x xW cm
- Din tch ng hn:20.7 ( 1) 0.7 1 (40 1) 27.3h h dF xh x h x x cm
Kim tra ng hn:
-
8/12/2019 Do an ket cau thep 2
39/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 39
2 2
4740.4813.357 21
2. 2 177.45d
h
M KN KN R
W x cm cm=> t yu cu.
2 2
395.047.235 15
2. 2 27.3hd
g
h
Q KN KN R
F x cm cm=> t yu cu.
2 2 2 22 2
13.357 7.235 15.19 15ht h h g KN KN
Rcm cm
chnh lch cho php: 15.19 15
100% 1.25% 5%15.19
x c th chp nhn c.
ng hn kh nng chu lc.
d. Tnh sn ngn:+ Sn ngn A:
S tnh l dm n gin c lA=bc=30cm.
- Ti trng:2
2 1
14( ) 0.729 (10 ) 12.393
2 2Aa KN
q a xcm
- Moment:2 212.393 30
1394.2138 8
AA
q xl xM KNcm
- Lc ct ti tit din u dn( hn vi dm )
200
X10
200
X10
200
X1
0
200
X1
0
200X10
300X1
0
300x15 1
0
15
350X10
250X10
250X10
250X10
-
8/12/2019 Do an ket cau thep 2
40/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 40
12.393 30185.895
2 2A
A
q xl xQ KN
- Dng sn ngang cao bng chiu cao dm : hA=40cm.- B dy sn ngn 1.0
sn
cm
2 2 2 2
6 6 1394.2136.829 21
1 35A
A
A A
M x KN KNR
xh x cm cm
- B dy ng hn lin kt sn ngn A vo dm ( lin kt 2 bn):0.5 12.393 0.5 30
0.32 0.7 2 0.7 (30 1) 15
A Ah h
h g
q x l x xh cm
x xl xR x x x.
Dng hh=8mm.
+ Sn gia c B:
S tnh l dm conson c lB=0.5x40=20cm.
- Ti trng:3 4
4
31 400.308 10.934
2 4 2 2Ba a KN
q xcm
.
- Moment:2 210.934 20
2186.82 2
B BB
q xl xM KNcm
- Lc ct:10.934 20 218.68
B B BQ q xl x KN .
- Chiu cao cn thit ca sn ngn B tnh theo iu kin chu un6 6 2186.8
24.9. 1 21
BB
B
M xh cm
R x.
Chn hB= 25cm.
- B dy sn ngn B l 10sn mm 2 2
6 6 2186.8 3.499 211 25 2 2
BB
B B
M x KN KN Rxh x cm cm
- B dy ng hn lin kt sn ngn B vo dm ( lin kt 2 bn): 10.934 20
0.542 0.7 2 0.7 (20 1) 15
A Bh h
h g
q xl xh cm
x xl xR x x x. Dng hh=8mm.
+ Sn gia c B1:
S tnh l dm conson c lB1=20cm.
- Ti trng:4 2
1 5
31 310.121 3.751
2 2 2 2Ba a KN
qcm
-
8/12/2019 Do an ket cau thep 2
41/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 41
- Moment:2 2
1 11
3.751 20750.2
2 2B B
B
q xl xM KNcm
-
Lc ct:.
B b BQ q l 3.751x20=75.02KN.
- Chiu cao cn thit ca sn ngn B tnh theo iu kin chu un:1
11
6 6 750.214.64
1 21B
B
B
M xh cm
xR x
Chn hB1=25cm.
- B dy sn ngn B l 10sn mm .12 2 2
1 16 6 750.2 7.2021 25
BB
B B
M x KNxh x cm
- B dy ng hn lin kt sn ngn B1vo dm (lin kt 2 bn):1 3.751 20 0.19
2 0.7 2 0.7 (20 1) 15B B
h h
h g
q xl xh cm
x xl xR x x x=>Dng hh=8mm.
+ Tnh cc ng hn ngang lin kt vo bn theo phn lc t bn trn 1 gii 1cm:
- ng hn lin kt dm vo bn :16.46
0.7842. . . 2 0.7 15 1
d
h hg h
q
h cml x x x => Chn hh=0.8cm
- Sn A lin kt vo bn (1 ng hn).12.393
0.592. . . 2 0.7 15 1
Ah h
g h
qh cm
l x x x=> Chn hh=0.8cm
- Sn B lin kt vo bn (2 ng hn).10.934
0.5212. . . 2 0.7 15 1
Bh h
g h
qh cm
l x x x=> Chn hh=0.8cm
- Sn B1 lin kt vo bn (2 ng hn).1 3.751 0.179
2. . . 2 0.7 15 1
Bh h
g h
qh cm
l x x x=> Chn hh=0.8cm
Vy ta dng mi ng hn ngang lin kt vi bn u dy 8mm.
e. Tnh bu long neo:T bng t hp ni lc ct, tit din chn ct (IV-IV), tm ra cp ni lc cho moment un ln nht vlc dc nh nht. Trong trng hp ny ta tm c cp ni lc (5,7) do lc hm ca cu trc v gi
tri gy nn l:
-
8/12/2019 Do an ket cau thep 2
42/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 42
M=329.24
0.9 377.12 646.4981.1
x KNm .
N=212.61
0.9 173.9541.1
x KN.
+ bu long neo nhnh mi:
- ng sut ti y mng:maxmin
2
2 2
173.954 6 646.498 100.029 0.431
40 150 40 150
N M x x KN
F W x x cm.
=>max 2
min 2
0.46
0.402
KN
cm
KN
cm
Ta c:
Y1= max
max min
0.46150 80.046 .
0.46 0.402xL x cm
Y2=L- Y1=150-80.046=69.954cm.
- Khong cch t trng tm vng nn n mp bn l:1
1 180.046 26.682 .
3 3X Y x cm
- Khong cch t im t lc n trng tm vng b tong nn l:Y=L-a1-x= 150-10-26.682=113.318cm.
- Din tch bu long chu ko cn thit l:2646.498 10 173.954 (0.5 150 26.682)
113.318 14th neo
M Nxa x x xF
YxR x35.453 cm2.
Dng 2 bulong ng knh 56mm c din tch chn Fchn=19.02x2=38.04 cm2.
+ Tnh bu long neo nhnh cu chy:
Dung 2 bulong neo nhnh cu chy ng knh 56mm c din tch chn Fchn=19.02x2=38.04 cm2.
- Lc ko ln nht trong 1 bulng l:Nk=
2646.498 10 173.954 (0.5 150 26.682)248.172
2. 2 113.318
M N a x x
YKN.
- Tnh chiu di neo bulng vo btng mng Cng lc dnh gia btng v bulng l:
=402
KN
cm.
- Chiu di neo bulng:
-
8/12/2019 Do an ket cau thep 2
43/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 43
K
bl neoneo
F Rl
n
- Trong :1. Rn=1.5
2
KN
cm
2. m= (3.6-6) chn m=43. =
2
1.50.375
4nR KN
m cm
4. n=4(3.14x5.6)=70.336cm.5. lneo= 38.04 14 20.191 .
0.375 70.336 cm
vy chn lneo=25cm.
+ tnh sn conson bulng neo qua qu m bng thp gc L:
- chn dm k bulng l thp hnh L 200x125x11.- Khong cch t trc bulng n dm l e= 15cm.- Sn bulng neo tnh nh conson nhp e=15cm.- Hn cc sn vo dm .- Moment ti tit din ngm( hn sn vo dm ).
M =NKx e= 248.172x15=3722.58 KNm.- Chn sn dy 10mm, cao 30cm.- Kim tra tit din sn.
2 2 2
6 3722.5810.489 21
2. 2 0.7 1 (40 1)s
M KN KN
W cm cm=> t.
2
248.1724.545
2 2 0.7 1 (40 1)K
s
N KN
F cm t.
2 2 2 2
10.489 4.545td h h =11.431 2KN
cm < h
gR =15 2
KN
cm .
Vy ng hn kh nng chu lc.
-
8/12/2019 Do an ket cau thep 2
44/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 44
PHN VII:
THIT K DN MI
A. TNH NI LC THEO PHNG PHP GIN CRMNA:1. S V KCH THC CHNH CA DN:
Dn c s hnh thang, dc cnh trn i = 0.1 0 chiu cao u dn l 2.2m
Chiu di thc t ca dn :L0= L2ht= 302 x 0.45 = 29.1 m
Kt cu ca tri :Lct= 12 m, cao 2.2 m
Ta c s dn :
2. TI TRNG TC DNG LN DN:
a. Tnh ti :
Trng lng mi: gkc= 0.36 2KN
m
Trng lng ca tri: gct= 0.18 2KNm
Trng lng cc lp vt liu mi: gm=4.35 2KN
m.
Trng lng cnh v bu ca mi: Gct=6KN.
Moment u dn do tnh ti mi gy ra: Mtr=Mph=-190.98 KNm.
b. Hot ti : hot ti mi
Hot ti y l hot ti sa cha mi phn b u theo phn nm ngang v c gi tr:
p=5.88KN/m2.Mment u dn: Mtr=Mph=-38.209 KNm.
c. p lc ng maxtrD :
Mment u dn : Mtr=5.28 KNm.
Mph=86.22 KNm.
Trng hp maxphD s ly kt qu i xng trong trng hp max
trD qua trc gia dn.
d. Lc hm ngang Ttr:
M men u dn :15.48
75.98tr
ph
M kNm
M kNm
-
8/12/2019 Do an ket cau thep 2
45/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 45
3. TNH TON NI LC TRONG DN:
* Ni lc tnh ton ca cc thanh dn : xc nh bng phng php gii crmona :
Tnh chi tit :
a. Ti trng thng xuyn-Nt u dn :
1 m d
dB 3 6G g g 4.53 0.36 44.01kN
2 2
- Nt trung gian:
G2= 2G1= 44.01 x 2 = 88.02 kN
-Nt ti chn ca tri :
2
3 2 ct ct
3
d B
G 2G g G23 6
G 88.02 0.18 95.64kN2
-Nt c kt cu ca tri :
4 ct 2G d.B.g G 3 6 0.18 88.02 91.26kN
S tnh
Gin Crmna trng hp tnh ti
Kt qu ni lc trong dn nh sau:
12
3 4
5
6 7
8
9 10
11
1213
14
15
a
c
b
d ef g
h k l m
n o p44.01 88.02
88.02 95.64
91.2691.26
86.8
86.8
452.58 452.58
872
7165
7165
9177
9177
913
588
880
224
4634
3893
6518
8690
8761
4526
4139
353bd c
1e
2 a
f
3
4
g
5
6
h
k
7
8
-
8/12/2019 Do an ket cau thep 2
46/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 46
Thanh a-2 a-5 a-8 c-1 e-1 f-3 g-4 h-6
N(KN) 413.9 869.0 876.1 -35.3 87.2 -716.5 -716.5 -917.7
Thanh k-7 1-2 2-3 3-4 4-5 5-6 6-7 7-8
N(KN) -917.7 -651.8 389.3 -88.0 -224.4 63.4 -91.3 58.8
b. hot ti sa cha mi :
- Vi nt u dn :
P1= 0.5 x d.P = 0.5 x 3 x 5.88 = 8.82 kN
- Vi nt trung gian :
P2= 2P1= 2 x 8.82 = 17.64 kN
- Vi nt ti chn ca triP3= P2/2 + 0.5 d2P = 8.82 + 0.5 x 3 x 5.88 = 17.64kN
- Vi nt c kt cu ca tri :
P4= d2.P = 3 x 5.88 = 17.64 kN.
Moment u dn c thay th bng mt cp ngu lc c gi tr38.209
2.2=17.368 KN.
Vi cc dn phn nh : tch dn phn nh, xc nh ti trng t mt v dn phn nh. v gin dn. an ton ta xem nh lc t mt dn phn nh l hot ti c tr s bng (P2+ G2). Ni lctrong thanh dn phn nh c cng vo ni lc ca thanh chnh khi ni lc ca thanh dn phn nhlm tng ni lc tnh ton ca thanh chnh .
S tnh
Gin Crmna trng hp hot ti
12
3 4
5
6 7
8
9 10
11
1213
14
a
c
b
d ef
gh
k l mn o
p8.8217.64
17.64 17.64
17.6417.64
17.368
17.368
88.2 88.2
15
12671
13824
13824
17641
17641
1764
422
3
1239
1764
1116
7997
16692
16846
17630
17641
7495
708
1745
a
e
f
g
h
k
1
2
3
4
5
6
78
-
8/12/2019 Do an ket cau thep 2
47/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 47
Kt qu ni lc trong dn nh sau:
Thanh a-2 a-5 a-8 c-1 e-1 f-3 g-4 h-6
N(KN) 79.97 166.92 168.46 -7.08 17.45 -138.24 -138.24 -176.41
Thanh k-7 1-2 2-3 3-4 4-5 5-6 6-7 7-8
N(KN) -176.41 -126.71 74.95 -17.64 -42.23 12.39 -17.64 11.16
c. p lc ng Dmaxtr:Mtr=-5.28 KNm; Mtr=-86.22KNm
Ti khng tc dng trc tip ln dn do chng ta s gii cho trng hp M tr=1 (trng hp Mph=1s ly i xng qua trc dn).
S tnh
Gin Crmna trng hp M=+1 t ti u dn tri
Ni lc trong dn s c xc nh nh sau:
ij ijtr tr ijph phN N M N M
12
3 4
5
6 7
8
9 10
11
1213
14
a
c
b
d
0.4545
0.4545
0.0333 0.0333
15
4082 519
5
cb
a
d
1
e
2
3, 4
5
6, 7
8
9, 10
11
12, 13
14
15
3330
4032
9697
13524
22587
36000
4545
1230
1966
5
8611
17744
28717
7091
656
0
2771
41
2995
11838
45677
3637
-
8/12/2019 Do an ket cau thep 2
48/80
-
8/12/2019 Do an ket cau thep 2
49/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 49
d. Lc hm ngang T :Mtr=-15.48 KNm; Mtr=-75.98KNm
Ni lc trong dn do lc hm
Thanh Mment n v max
trT max
phT
Mtr=1 M h=1 Mtr=-15.48 M h=-75.98 Lc dc M h=-15.48 Mtr=-75.98 Lc dc(1) (2) (3) (4) (5) (6) (7) (8) (9)
a2 0.36 0.04 -5.5728 -3.0392 -8.612 -0.6192 -27.3528 -27.972
a5 0.226 0.097 -3.49848 -7.37006 -10.86854 -1.50156 -17.17148 -18.67304
a8 0.135 0.135 -2.0898 -10.2573 -12.3471 -2.0898 -10.2573 -12.3471
a11 0.097 0.226 -1.50156 -17.17148 -18.67304 -3.49848 -7.37006 -10.86854
a14 0.04 0.36 -0.6192 -27.3528 -27.972 -5.5728 -3.0392 -8.612
d1 -0.457 0 7.07436 0 7.07436 0 34.72286 34.72286
d3=d4 -0.287 -0.072 4.44276 5.47056 9.91332 1.11456 21.80626 22.92082
d6=d7 -0.177 -0.118 2.73996 8.96564 11.7056 1.82664 13.44846 15.2751
d9=d10 -0.118 -0.177 1.82664 13.44846 15.2751 2.73996 8.96564 11.7056
d12=d13 -0.072 -0.287 1.11456 21.80626 22.92082 4.44276 5.47056 9.91332
d15 0 -0.457 0 34.72286 34.72286 7.07436 0 7.07436
c1 -0.045 0 0.6966 0 0.6966 0 3.4191 3.4191
0 0 0 0 0 0 0 01_2 0.123 -0.052 -1.90404 3.95096 2.04692 0.80496 -9.34554 -8.54058
2_3 -0.097 0.041 1.50156 -3.11518 -1.61362 -0.63468 7.37006 6.73538
3_4 0 0 0 0 0 0 0 0
4_5 0.0861 -0.036 -1.332828 2.73528 1.402452 0.55728 -6.541878 -5.984598
5_6 -0.071 0.03 1.09908 -2.2794 -1.18032 -0.4644 5.39458 4.93018
6_7 0 0 0 0 0 0 0 0
7_8 0.066 -0.028 -1.02168 2.12744 1.10576 0.43344 -5.01468 -4.58124
8_9 -0.028 0.066 0.43344 -5.01468 -4.58124 -1.02168 2.12744 1.105769_10 0 0 0 0 0 0 0 0
10_11 0.03 -0.071 -0.4644 5.39458 4.93018 1.09908 -2.2794 -1.18032
11_12 -0.036 0.0861 0.55728 -6.541878 -5.984598 -1.332828 2.73528 1.402452
12 _13 0 0 0 0 0 0 0 0
13_14 0.041 -0.097 -0.63468 7.37006 6.73538 1.50156 -3.11518 -1.61362
14_15 -0.052 0.123 0.80496 -9.34554 -8.54058 -1.90404 3.95096 2.04692
-
8/12/2019 Do an ket cau thep 2
50/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 50
e. p lc gi :Mtr=79.07 KNm; Mtr=-86.94KNm
Thanh
Mment n v GI TRI GI PHI
Mtr=1 Mph=1 Mtr=79.07 Mph=-86.94 Lc dc Mph=79.07 Mtr=-86.94 Lc dc
(1) (2) (3) (4) (5) (6) (7) (8) (9)a2 0.36 0.04 28.4652 -3.4776 24.9876 3.1628 -31.2984 -28.1356a5 0.226 0.097 17.86982 -8.43318 9.43664 7.66979 -19.64844 -11.9787a8 0.135 0.135 10.67445 -11.7369 -1.06245 10.67445 -11.7369 -1.06245a11 0.097 0.226 7.66979 -19.64844 -11.9787 17.86982 -8.43318 9.43664a14 0.04 0.36 3.1628 -31.2984 -28.1356 28.4652 -3.4776 24.9876d1 -0.457 0 -36.13499 0 -36.135 0 39.73158 39.73158d3=d4 -0.287 -0.072 -22.69309 6.25968 -16.4334 -5.69304 24.95178 19.25874
d6=d7 -0.177 -0.118 -13.99539 10.25892 -3.73647 -9.33026 15.38838 6.05812d9=d10 -0.118 -0.177 -9.33026 15.38838 6.05812 -13.99539 10.25892 -3.73647d12=d13 -0.072 -0.287 -5.69304 24.95178 19.25874 -22.69309 6.25968 -16.4334d15 0 -0.457 0 39.73158 39.73158 -36.13499 0 -36.135c1 -0.045 0 -3.55815 0 -3.55815 0 3.9123 3.9123
0 0 0 0 0 0 0 01_2 0.123 -0.052 9.72561 4.52088 14.24649 -4.11164 -10.69362 -14.80532_3 -0.097 0.041 -7.66979 -3.56454 -11.2343 3.24187 8.43318 11.675053_4 0 0 0 0 0 0 0 04_5 0.0861 -0.036 6.807927 3.12984 9.937767 -2.84652 -7.485534 -10.33215_6 -0.071 0.03 -5.61397 -2.6082 -8.22217 2.3721 6.17274 8.544846_7 0 0 0 0 0 0 0 07_8 0.066 -0.028 5.21862 2.43432 7.65294 -2.21396 -5.73804 -7.9528_9 -0.028 0.066 -2.21396 -5.73804 -7.952 5.21862 2.43432 7.652949_10 0 0 0 0 0 0 0 010_11 0.03 -0.071 2.3721 6.17274 8.54484 -5.61397 -2.6082 -8.2221711_12 -0.036 0.0861 -2.84652 -7.485534 -10.3321 6.807927 3.12984 9.93776712 _13 0 0 0 0 0 0 0 013_14 0.041 -0.097 3.24187 8.43318 11.67505 -7.66979 -3.56454 -11.234314_15 -0.052 0.123 -4.11164 -10.69362 -14.8053 9.72561 4.52088 14.24649
-
8/12/2019 Do an ket cau thep 2
51/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 51
f. Ni lc trong dn :
ThanhTnhti Hot Ti max
trD maxphD trT trT phT phT Gi tri Gi phi
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
a2 413.9 79.97 -5.3496 -31.2504 -8.612 8.612 -27.972 27.972024.9876 -28.1356
a5 869 166.92 -9.55662 -19.9979 -10.8685 10.869 -18.673 18.67309.43664 -11.9787
a8 876.1 168.46 -12.3525 -12.3525 -12.3471 12.347 -12.3471 12.3471-1.06245 -1.06245
a11 869 166.92 -19.9979 -9.55662 -18.673 18.673 -10.8685 10.8685 -11.9787 9.43664
a14 413.9 79.97 -31.2504 -5.3496 -27.972 27.972 -8.612 8.6120 -28.1356 24.9876
d1 87.2 17.45 2.41296 39.40254 7.07436 -7.074 34.72286 -34.7229 -36.135 39.73158
d3=d4 -716.5 -138.24 7.7232 25.1253 9.91332 -9.913 22.92082 -22.9208-16.4334 19.25874
d6=d7 -917.7 -176.41 11.10852 15.88398 11.7056 -11.706 15.2751 -15.2751-3.73647 6.05812
d9=d10 -917.7 -176.41 15.88398 11.10852 15.2751 -15.275 11.7056 -11.70566.05812 -3.73647
d12=d13 -716.5 -138.24 25.1253 7.7232 22.92082 -22.921 9.91332 -9.9133 19.25874 -16.4334
d15 87.2 17.45 39.40254 2.41296 34.72286 -34.723 7.07436 -7.0744 39.73158 -36.135
c1 -35.3 -7.08 0.2376 3.8799 0.6966 -0.697 3.4191 -3.4191-3.55815 3.9123
1_2 -651.8 -126.71 3.834 -10.3305 2.04692 -2.047 -8.54058 8.540614.24649 -14.8053
2_3 389.3 74.95 -3.02286 8.14686 -1.61362 1.614 6.73538 -6.7354-11.2343 11.67505
3_4 -88 -17.64 0 0 0 0.000 0 0.0000 0 0
4_5 -224.4 -42.23 2.649312 -7.23346 1.402452 -1.402 -5.9846 5.9846 9.937767 -10.3321
5_6 63.4 12.39 -2.21172 5.96322 -1.18032 1.180 4.93018 -4.9302-8.22217 8.54484
6_7 -91.3 -17.64 0 0 0 0.000 0 0.0000 0 0
7_8 58.8 11.16 2.06568 -5.54268 1.10576 -1.106 -4.58124 4.58127.65294 -7.952
8_9 58.8 11.16 -5.54268 2.06568 -4.58124 4.581 1.10576 -1.1058-7.952 7.65294
9_10 -91.3 -17.64 0 0 0 0.0000 0 0.0000 0 0
10_11 63.4 12.39 5.96322 -2.21172 4.93018 -4.930 -1.18032 1.1803 8.54484 -8.22217
11_12 -224.4 -42.23 -7.23346 2.649312 -5.9846 5.985 1.402452 -1.4025-10.3321 9.937767
12 _13 -88 -17.64 0 0 0 0.000 0 0.00000 0
13_14 389.3 74.95 8.14686 -3.02286 6.73538 -6.735 -1.61362 1.613611.67505 -11.2343
14_15 -651.8 -126.71 -10.3305 3.834 -8.54058 8.541 2.04692 -2.0469-14.8053 14.24649
-
8/12/2019 Do an ket cau thep 2
52/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 52
f. T hp ni lc :
ThanhT hp c bn 1 T hp c bn 2 Ni lc tnh ton
Nmax Nmin Nmax Nmin Nmax Nmin
1 2 3 4 5 6 7
a2 493.87 382.65 508.362 335.278 508.36 335.278
a5 1035.92 849.00 1027.721 823.415 1035.92 823.415
a8 1044.56 863.75 1027.714 852.914 1044.56 852.914
a11 1035.92 849.00 1027.721 823.415 1035.92 823.415
a14 493.87 382.65 508.362 335.278 508.36 335.278
d1 126.93 51.07 205.376 54.679 205.38 51.065
d3=d4 -691.37 -854.74 -655.926 -855.706 -655.93 -855.706
d6=d7 -901.82 -1094.11 -884.205 -1079.832 -884.20 -1094.110
d9=d10 -901.82 -1094.11 -884.205 -1079.832 -884.20 -1094.110
d12=d13 -691.37 -854.74 -655.926 -855.706 -655.93 -855.706
d15 126.93 51.07 205.376 54.679 205.38 51.065
c1 -31.39 -42.38 -25.210 -44.874 -25.21 -44.874
0.00 0.00 0.000 0.000 0.00 0.000
1_2 -637.55 -778.51 -633.685 -796.148 -633.69 -796.148
2_3 464.25 378.07 480.657 375.016 480.66 375.016
3_4 -88.00 -105.64 -88.000 -103.876 -88.00 -105.640
4_5 -214.46 -266.63 -211.809 -283.602 -211.81 -283.602
5_6 75.79 55.18 92.045 52.947 92.05 52.947
6_7 -91.30 -108.94 -91.300 -107.176 -91.30 -108.940
7_8 69.96 50.85 78.586 42.532 78.59 42.532
8_9 69.96 50.85 78.586 42.532 78.59 42.532
9_10 -91.30 -108.94 -91.300 -107.176 -91.30 -108.940
10_11 75.79 55.18 92.045 52.947 92.05 52.947
11_12 -214.46 -266.63 -211.809 -283.602 -211.81 -283.602
12 _13 -88.00 -105.64 -88.000 -103.876 -88.00 -105.640
13_14 464.25 378.07 480.657 60.666 480.66 60.666
14_15 -637.55 -778.51 -633.685 -796.148 -633.69 -796.148
-
8/12/2019 Do an ket cau thep 2
53/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 53
B. TNH NI LC THEO PHN MM SAP 2000:
TABLE: Element Forces - Frames
Frame Station OutputCase CaseType StepType StepNum P
Text m Text Text Text Unitless KN
12 0 DEAD LinStatic 497.548
14 0 DEAD LinStatic 944.786
16 0 DEAD LinStatic 941.946
18 0 DEAD LinStatic 944.786
20 0 DEAD LinStatic 497.548
22 1.50748 DEAD LinStatic 2.08E-13
23 0 DEAD LinStatic -797.267
24 0 DEAD LinStatic -797.267
25 0 DEAD LinStatic -989.318
26 0 DEAD LinStatic -989.318
27 0 DEAD LinStatic -989.282
28 0 DEAD LinStatic -989.282
29 0 DEAD LinStatic -797.231
30 0 DEAD LinStatic -797.231
31 0 DEAD LinStatic 0.018
42 0 DEAD LinStatic -44.189
43 0 DEAD LinStatic -647.811
44 0 DEAD LinStatic 385.121
45 0 DEAD LinStatic -218.029
46 0 DEAD LinStatic 57.134
47 0 DEAD LinStatic 67.17348 0 DEAD LinStatic 67.612
49 0 DEAD LinStatic 56.766
50 0 DEAD LinStatic -217.661
51 0 DEAD LinStatic 384.824
52 0 DEAD LinStatic -647.515
53 0 DEAD LinStatic -88.378
55 0 DEAD LinStatic -91.618
56 0 DEAD LinStatic -88.378
57 0 DEAD LinStatic -91.618
58 0 DEAD LinStatic -44.189
4547
49 56 5243
12
44 53
14
46 57
16
48 55
18
5051
20
5842
2223
2425
26 2728
29 3031
-
8/12/2019 Do an ket cau thep 2
54/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 54
C. NHN XT-CHN PHNG N TNH TON CC THANH DN:
Da vo kt qu ni lc ca 2 phng php tnh ton cho dn ta nhn thy kt qu gn ging nhau.Nguyn nhn dn n kt qu c sai s l do ta quy c cc h s trong qu trnh tnh ton.
T 2 kt qu tnh c th ta ly kt qu gii th cng i tnh ton thanh dan v kt qu ny c gi trni lc ln hn gy nguy him hn.
D. TNH TON CC THANH DN:
1. XC NH CHIU DI TNH TON CC THANH DN:
Mi lp panen btng loiln kch thc 6x1.5m nn ta b tr h thng dn phn nh nh trn.
Cc thanh dn c phn thnh 3 loi nh sau:
Loi thanh Tn Thanh Nmax Nmin l(m)lox(m) loy(m)
Thanh xin u dn 1_2 -633.69 -796.1477 3.9 1.95 3.9
Thanh bng
c_1 -25.21 -44.87434 2.2 0.88 2.2
2_3 480.66 375.01627 3.9 1.56 3.9
3_4 -88.00 -105.64 2.8 1.12 2.8
4_5 -211.81 -283.6021 4.31 1.724 4.31
5_6 92.05 52.947211 4.31 1.724 4.31
6_7 -91.30 -108.94 3.4 1.36 3.47_8 78.59 42.531672 4.76 1.904 4.76
Thanh Cnh Trn
e_1 205.38 51.06501 3.01 3.01 6
f_3 -655.93 -855.7061 3.01 3.01 6
g_4 -655.93 -855.7061 3.01 3.01 6
h_6 -884.20 -1094.11 3.01 3.01 6
k_7 -884.20 -1094.11 3.01 3.01 6
Thanh Cnh Dia_2 508.36 335.2778 6 6 6a_5 1035.92 823.41539 6 6 6
a_8 1044.56 852.91416 6 6 6
2200
6000 6000 6000 6000 6000
2200 3
700
-
8/12/2019 Do an ket cau thep 2
55/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 55
Trong : + l l khong cch gia 2 mt dn
+ loxl chiu di tnh ton trong mt phng khung.
+ loyl chiu di tnh ton ngoimt phng khung.
2. CHN TIT DIN CC THANH DN:
2.1 Thanh xin u dn:
* Chn tit din:
Tnh nh thanh chu nn ng tm vi N=-796.1477KN.
T N=796.1477KN>601KN ta chn b dy bn mt l 14mm.
Gi thit =80 =0.726.
Din tch tit din cn thit: 2796.1477
52.22. 0.726 21yc
NF cm
R.
mnh cho php ca thanh xin u dn chu nn l =120 do bn knh qun tnh yu cu ca
tit din:
0
0
1951.625 .
120
3903.25 .
120
xx yc
y
y yc
lr cm
lr cm
Chn tit din gm 2 thp gc khng u cnh L160x100x12, ghp theo cnh ngn, c cc c trnghnh hc sau:
- Din tch: F=60cm2.- Bn knh qun tnh: rx =2.82>1.625
ry =7.90>3.25
* Kim tra li tit din:
0
0
19569.15
2.82
39049.367
7.9
xx
x
y
y
l
r
l
r
Y
X12
14
160
100
-
8/12/2019 Do an ket cau thep 2
56/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 56
Chn max( ; ) 69.15x y 0.782.
Kim tra n nh trong thanh: 2 2796.1477
16.97 21. 0.782 60
N KN KNR
F cm cm
Vy tit din chn m bo kh nng chu lc.2.2 Thanh bng:
a. Thanh 2_3
* Chn tit din
Thanh chu ko ng tm N=480.66 KN nn din tch yu cu c tnh theo cng thc.
2480.66 22.8921yc
NF cm
R.
mnh cho php ca thanh chu ko l =400 do bn knh qun tnh yu cu ca tit din:
0
0
1560.39 .
400
3900.975 .
400
xx yc
y
y yc
lr cm
lr cm
Chn tit din gm 2 thanh thp gc khng u cnh L100x63x8, ghp theo cnh ngn, c cc ctrng hnh hc sau:
- Din tch: F=25.2cm2
.- Bn knh qun tnh: rx =1.77>0.39
ry =5.12>0.975
Kim tra n nh trong thanh: 2 2480.66
19.07 2125.2
N KN KNR
F cm cm
Vy tit din chn m bo kh nng chu lc.
b. Thanh 4_5
* Chn tit din:
8
14
100
6
3
Y
X
-
8/12/2019 Do an ket cau thep 2
57/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 57
Tnh nh thanh chu nn ng tm vi N= -283.6021KN.
Gi thit =100 =0.591.
Din tch tit din cn thit: 2283.6021
22.85
. 0.591 21
yc
NF cm
R
.
mnh cho php ca thanh chu nn l =150 do bn knh qun tnh yu cu ca tit din:
0
0
172.41.15 .
150
4312.87 .
150
xx yc
y
y yc
lr cm
lr cm
Chn tit din gm 2 thp gc khng u cnh L100x63x8, ghp theo cnh ngn, c cc c trng hnh
hc sau:
- Din tch: F=25.2cm2.- Bn knh qun tnh: rx =1.77>1.15
ry =5.12>2.87
* Kim tra li tit din:
0
0
172.497.4
1.77
431
84.185.12
xx
x
y
y
l
r
l
r
Chn max( ; ) 97.4x y 0.608.
Kim tra n nh trong thanh: 2 2283.6021
18.5 21. 0.608 25.2
N KN KNR
F cm cm
Vy tit din chn m bo kh nng chu lc.
2.3 Thanh cnh:
a. Thanh h_6
* Chn tit din:Thanh chu nn ng tm viN=1094.11KN.
8
14
100
63
Y
X
-
8/12/2019 Do an ket cau thep 2
58/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 58
Gi thit =100 =0.591.
Din tch tit din cn thit: 21094.11
88.156. 0.591 21yc
NF cm
R.
mnh cho php ca thanh chu nn l =150 do bn knh qun tnh yu cu ca tit din:
0
0
3012 .
150
6004 .
150
xx yc
y
y yc
lr cm
lr cm
Chn tit din gm 2 thp gc u cnh L200x12, c cc c trng hnh hc sau:
- Din tch: F=94.2cm2.- Bn knh qun tnh: rx =6.22>2
ry =8.69>4
* Kim tra li tit din:
0
0
30148.39
6.22
600
66.968.69
xx
x
y
y
l
r
l
r
Chn max( ; ) 66.96x y 0.792.
Kim tra n nh trong thanh: 2 21094.11
14.67 21. 0.792 94.2
N KN KNR
F cm cm
Vy tit din chn m bo kh nng chu lc.
b. Thanh a_8
* Chn tit din
Thanh chu ko ng tm N=1044.56 KN nn din tch yu cuc tnh theo cng thc.
12
14
200
200
Y
X
-
8/12/2019 Do an ket cau thep 2
59/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 59
21044.56 49.7421yc
NF cm
R.
mnh cho php ca thanh chu ko l =400 do bn knh qun tnh yu cu ca tit din:
0
0
600 1.5 .400
6001.5 .
400
xx yc
y
y yc
lr cm
lr cm
Chn tit din gm 2 thanh thp gc u cnh L100x14, ghp theo cnh ngn, c cc c trng hnhhc sau:
- Din tch: F=52.6cm2.- Bn knh qun tnh: rx =3>1.5
ry =4.76>1.5
Kim tra n nh trong thanh: 2 21044.56
19.86 2152.6
N KN KNR
F cm cm
Vy tit din chn m bo kh nng chu lc.
3. TNH DN PHN NH:
Lc tc dng ln nt l nh nhau i vi tt c cc dn phn nh, ta xt tnh ton i vi dn c chiudi ln nht, l dn ngay ti chn ca mi.
Lc tc dng ln dn phn nh:
. 3 6( ) (0.36 0.453) 44.01
2 2m kcd B
G g g KN .
. 5.88 38.82
2 2
p dp KN.
44.01 8.82 52.83Q G P KN .
Ni lc trong cc thanh xin nh sau:
14
14
100
100
Y
X
26.41526.415
52.83
1 2
a
b c
c
a
b
1
2
5283
3684
-
8/12/2019 Do an ket cau thep 2
60/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 60
Thanh ng 1_2: N=-52.83KN.
Thanh xin a_1: N= 36.84KN.
Cc thanh xin ny c ni lc nh nn ta s tnh theo cu to.
a. Tnh thanh ng:+ Chiu di tnh ton:
l0x=0.8l=0.8x1.4=1.12m
loy= l =1.4m
+ mnh yu cu:
0
0
1120.747 .
150
140 0.93 .150
xx yc
yy yc
lr cm
lr cm
Chn tit din gm 2 thanh thp gc u cnh L50x5, c cc c trng hnh hc sau:
- Din tch: F=29.2cm2.- Bn knh qun tnh: rx =1.53>0.747
ry =2.61>0.93
b. Tnh thanh xin:
+ Chiu di tnh ton:
l0x=0.8l=0.8x1.95=1.56m
loy= l =1.95m
+ mnh yu cu:
mnh cho php ca thanh chu ko l =400 do bn knh qun tnh yu cu ca tit din:
0
0
1560.39 .
400
1950.49 .400
xx yc
y
y yc
lr cm
lr cm
Chn tit din gm 2 thanh thp gc u cnh L50x5, c cc c trng hnh hc sau:
- Din tch: F=29.2cm2.- Bn knh qun tnh: rx =1.53>0.39
ry =2.61>0.49
vy trong mt dn phn nh chn tit din 2L50x5
-
8/12/2019 Do an ket cau thep 2
61/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 61
Loi thanhTn
ThanhN(KN) Thp chn
Dintch
(cm2)
Chiu di (m)Bn knhqun tnh
(cm)mnh
l(m) lox(m) loy(m) rx ryx y
Thanh xin u dn 1_2 -796.15 L160x100x12 60.00 3.9 1.95 3.9 2.82 7.9 69.15 49.367
Thanh bng
c_1 -44.87 50x5 9.60 2.2 0.88 2.2 1.53 2.61 57.52 27.85
2_3 480.66 L100x63x8 25.20 3.9 1.56 3.9 1.77 5.12 88.14 149.43
3_4 -105.64 50x5 9.60 2.8 1.12 2.8 1.53 2.61 73.20 54.69
4_5 -283.60 L100x63x8 25.20 4.31 1.724 4.31 1.77 5.12 97.40 165.13
5_6 92.05 50x5 9.60 4.31 1.724 4.31 1.53 2.61 112.68 84.18
6_7 -108.94 50x5 9.60 3.4 1.36 3.4 1.53 2.61 88.89 130.27
7_8 78.59 50x5 9.60 4.76 1.904 4.76 1.53 2.61 124.44 182.38
Thanh CnhTrn
e_1 205.38 80x8 24.60 3.01 3.01 6 2.44 3.84 123.36 229.89
f_3 -855.71 200x12 94.20 3.01 3.01 6 6.22 8.69 48.39 156.25
g_4 -855.71 200x12 94.20 3.01 3.01 6 6.22 8.69 48.39 69.04
h_6 -1094.11 200x12 94.20 3.01 3.01 6 6.22 8.69 48.39 69.04
k_7 -1094.11 200x12 94.20 3.01 3.01 6 6.22 8.69 48.39 69.04
Thanh Cnh Di
a_2 508.36 80x8 24.60 6 6 6 2.44 3.84 245.90 69.04
a_5 1035.92 100x14 52.60 6 6 6 3 4.76 200.00 156.25
a_8 1044.56 100x14 52.60 6 6 6 3 4.76 200.00 126.05
4. TNH TON CC CHI TIT TRONG DN:
Trong n ny ta s tnh ton cc chi tit chnh sau:
- Mt gi dn (2)- Mt khuych i nh dn (4)- Mt khuych i gia dn cnh di(5)
-
8/12/2019 Do an ket cau thep 2
62/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 62
- Mt trung gian c ni thanh cnh dn(3)- Mt trn u dn (1)
1.1. Mt gi dn (Nt 2):
Cu to mt gi bao gm bn mt (2), bn gi (1) v gi (3).
Cc thanh dn (gm thanh cnh di, thanh xin u dn) hi t ti mp trong ct trn v lien kt vobn mt bng ng hn sng(4) v ng hn mp (5).
Lc tc dng vo bn mt gm:Lc dc trong thanh cnh di : N1= 508.36KN
Lc dc trong thanh xin : N2= -796.15KN
Mment u dn : M=478.329KNm
Cc ng hn c tnh ton nh sau:
ng hn lin kt thanh cnh di vo bn mt:
Lc dc N1c phn ra lm 2 truyn vo 2 thp gc: 1 508.36
2 2
NN =254.18KN.
Thp u cnh nn:- ng hn sng lin kt thp gc chu 1 lc l 0.7N=0.7x254.18=177.926 KN.
Chiu cao ng hn: hmin= 4mm; hmax=1.2x8=9.6mm
1
2
34
5 5
7 89
610
1112
13
14
15
BU LONG
2L80 x8
2L160x100x12
3
3
2
4
51
4
-
8/12/2019 Do an ket cau thep 2
63/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 63
Chn hhs=8mm => Chiu di ng hn sng cn thit l:
177.92621
( . ) (0.7 0.8) 15hs ghh h h
Nl cm
h R
-
ng hn mp chu 1 lc l 0.3N= 0.3x254.18=76.254KN
Chn hm=6mm => Chiu di ng hn mp cn thit l:
76.25412
( . ) (0.7 0.6) 15hm ghh h h
Nl cm
h R
ng hn lin kt thanh xin u dn vo bn mt:
Thp khng u cnh nn t l phn b lc gia ng hn sng v ng hn mp l 0.75/0.25.
Chn hs=10mm => Chiu di ng hn sng cn thit l:
2/ 2 796.15 / 20.75 0.75 28.43( . ) (0.7 1) 15hs gh h h
Nl cm
h R.
Chn hm=6mm => Chiu di ng hn mp cn thit l:
2/ 2 796.15 / 20.25 0.25 15.79( . ) (0.7 0.6) 15hm g
h h h
Nl cm
h R
Tnh ton sn gi 1:
Phn lc ng ti gi truyn vo lin kt hn gia bn mt v bn gi c gi tr bng
N2.sin=796.15.sin450=562.96KN.
Chn b rng sn bbg=200mm. Vi b dy bn gi 18bg mm , ta kim tra iu kin chu p mt cabn gi
2 2
562.9615.637 35
20 1.8em
em em
em
N KN KN R
F cm cm
B dy sn c xc nh nh sau:
Nu quan nim bn gi nh mt bn ngm 2 cnh l 2 hng bulong, chu lc nh H th b dy bngi c xc nh theo cng thc:
1
3. .1 1 3 10 217.4221.32 . 2 46 21
bg
b Hcml R
Trong b1l khong cch gia 2 hng bulong, ly bng 10cm
Mt khc 20s mm do ly 20s mm
Kim tra lin kt hn gia bn mt v bn gi:
Thay th moment u dn bng 1 cp ngu lc c g tr:
0
478.329217.422
2.2ngM
N KNh
.
cnh di, lc trng vi trc thanh cnh di, hng t tri qua phi, c xu hng tch bn gi cttrn. Khi di v trng tm lin kt ta thu c mt lc ngang H=217.422KN v mt moment
M=(N1-Nng) x e=(508.36-217.422)x0.05=14.547KNm.
-
8/12/2019 Do an ket cau thep 2
64/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 64
Phn lc ti gi truyn vo lin kt hn gia bn mt v bn gi c gi tr bng:
R= N2.sin= 796.15x2.5
3.9=510.353KN.
Vi hh= 50cm, ta tnh c chiu cao ng hn cn tit nh sau:
2 22 21 1 1454.7217.422 510.35
2 2 0.7 46 15 46lt
h h
h h g h
Mh H R
l R l x x x=0.59cm.
Chn hh=10mm. Cc c trng hnh hc ca 2 ng hn nh sau:
- Din tch: Fh=2(h.hh)lh= 2(0.7x1)x50=70 cm2.- Moment khng un: Wh= 2 2 3. 0.7 1 502 2 583.33
6 6h h h
h lcm
Kim tra cng ng hn:
2 2 2 21454.7 217.422 510.35
583.33 70 70h h h
M N Q
W F F=9.193
2
KN
cm
-
8/12/2019 Do an ket cau thep 2
65/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 65
Cc ng hn lin kt gi vo ct bao gm 2 ng hn 2 bn gi v 1 ng hn mp di chu 1 lc: 1.5RA=1.5x510.35=765.525KN
Chn hs=10mm => chiu di ng hn cn thit l:
765.525 72.9( . ) (0.7 1) 15h g
h h h
Nl cmh R
. Vy chiu di 2 ng hn bn l 25cm.
1.2. Mt trn (Nt 1):
Tng t nh mt gi, cu to mt trn bao gm bn mt, bn gi
Lc tc dng vo bn mt bao gm:Lc dc trong thanh cnh trn :N1=205.38KN
Lc dc trong thanh cnh xin dn phn nh :N2=36.84 KN
Thp moment m ln nht u dn :M2=-449.59 KNma)Tnh ng hn lin kt thanh cnh trn vo mt:Chiu cao ng hn:hmin=4mm; hmax=1.2x8=9.6mm
Chn hhs=6mm => Chiu di ng hn sng cn thit l:
1/ 2 205.38 / 20.7 1 0.7 1 12.41( . ) (0.7 0.6) 15hs g
h h h
Nl cmh R
Chiu di ng hn mp cn thit l:
1/ 2 205.38 / 20.7 1 0.3 1 5.89( . ) (0.7 0.6) 15hs g
h h h
Nl cm
h R
b)Tnh ng hn lin kt thanh xin u dn vo mt:Chiu cao ng hn: hmin=4mm; hmax=1.2x5=6 mm
Chn hhs=5mm => Chiu di ng hn sng cn thit l:
BAN MAT
50 x 5
80 X 8
-
8/12/2019 Do an ket cau thep 2
66/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 66
2/ 2 36.84 / 20.7 1 0.7 1 3.45( . ) (0.7 0.5) 15hs g
h h h
Nl cm
h R
Chiu di ng hn mp cn thit l:
2/ 2 36.84 / 20.3 1 0.3 1 2.05( . ) (0.7 0.5) 15hm g
h h h
Nl cm
h R
c)Tnh ton sn gi:Chn b rng sn bs=200mm
Thay th moment u dn bng mt cp ngu lc c gi tr:
0449.59 204.3592.2ng MN KNh
Khi di lc do moment ngu lc v trng tm ta thu c mt lc ngang
H=204.359 KN hng t phi sang tri v mt moment :
M=H x e=204.359x0.05=10.218KNm.
B dy sn gi c xc nh nh sau:
131 1 3 10 204.359
1.6752 . 2 26 21bgb H
cml R
Trong b1l khong cch gia 2 hng bulong, ly bng 10cm
Mt khc 20s mm do ly 20s mm
Kim tra lin kt hn gia bn mt v bn gi:
Lc dc trong thanh xin dn phn nh truyn vo lin kt gia bn mt v bn gi:
2
1.5.cos 36.84 31.045
1.78pnR N KN.
Vi lh=26cm, ta tnh c chiu cao ng hn cn thit nh sau:2 2
2 21 1 1021.8204.359 31.0452. . . 2 0.7 26 15 26
lth pnh
h h g h
Mh H N
l R l=0.45cm
Chn hh=8mm. cc c trng hnh hc ca 2 ng hn nh sau:
- Din tch: Fh=2(h.hh)lh=2(0.7x0.8)x26=29.12cm2.- Moment khng un: Wh= 2 2 3( . ) (0.7 0.8) 262 2 126.187
6 6h h h
h lcm
Kim tra cng nghn:
-
8/12/2019 Do an ket cau thep 2
67/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 67
2 2 2 21021.8 204.359 31.045
126.187 29.12 29.12h h h
M N Q
W F F=15.15
2
KN
cm.
chch lch15.15 15
100% 0.99% 5%
15.15
Kim tra iu kin p mt gia bn gi v gi :
Lc p mt: Nem=Rpn= 31.045KN
Cng p mt:
2 2
31.0450.776 35
20 2em
em em
em
N KN KN R
F cm cm
Tnh ton lin kt bulong bn gi vo cnh ct trn:
Chn b tr 2 hng bulong , mi hng gm 2 bulong nh hnh v, bulong c chn c bn thuclp 5-6.Lc ln nht xut hin trong thn bulong:
1max 2 2 2
. . 204.359 5 20 204.359
2 2 10 20 6bl
i
H z l HN
l n=54.5KN.
Din tch qua ren ca bulong:
2max 54.5 2.59521
bl
th
bl
NF cm
R.
Chn bulong 24, c Fth=3.52cm2.
1.3. Mt nh dn (Nt 4):
Cu to mt nh dn gm bn ph (1), bn mt(2),bn ni (3)v 2 sn ng(4)
Gc nghing ca thanh cnh so vi phng ngang l = arctan(1/10)=5.710.
Gc nghing ca thanh xin so vi phng ngang l =arctan(3.7/3)=50.90.
a.Ni cnh:Lc dc trong thanh cnh: Nct= -1094.11KN
BAN MAT
5
32
41
-
8/12/2019 Do an ket cau thep 2
68/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 68
Lc dc trong thanh xin: N tx=78.59KN.
Lc tnh ton: Ntt=1.2Nct=1.2x1094.11=1312.932 KN
Din tch tnh ton quy c:
Bn mt dy 14mm, ni 2 thp gc L200x12, do chn bn ph c tit din 440x10mm.
Khi din tch tnh ton quy c c tnh nh sau:
Ftt = Fbm + Fbp = 2 x1.2x20+44x1= 92cm2.
ng sut trung bnh trong tit din tnh ton quy c:
2 2
1312.93214.27 21
92tt
tb
tt
N KN KN R
F cm cm
lc truyn vo bn mt: Nbm=tb.Fbm=14.27x48=684.96 KN.
Kim tra cng ng hn lin kt thanh cnh trn vo bn mt:Thp u cnh nn:
ng hn sng lin kt thp gc chu lc 1 lc l Ns= 0.7Nbm=0.7x684.96=479.472 KN.
Chiu cao ng hn: hmin=4mm ; hmax=1.2x1.2=1.44cm
Chn hhs=12mm => Chiu di ng hn sng cn thit l:
/ 2 479.472 / 219
( . ) (0.7 1.2) 15s
hs g
h h h
Nl cm
h R
Chn hhm =8mm => Chiu di ng hn mp cn thit l:
/ 2 684.96 / 20.3 0.3 12.23
( . ) (0.7 0.8) 15bm
hm g
h h h
Nl cm
h R
Ly chiu di ng hn sng l 21cm, chiu di ng hn mp l 15cm.
Tng din tch ng hn:
Fh=(h.hh)lh=2(0.7x1.2x20+0.7x0.8x14)=49.28 cm2.
ng sut trong ng hn c kim tra nh sau:
2
684.9613.9
49.28bm
h
h
N KN
F cm
-
8/12/2019 Do an ket cau thep 2
69/80
-
8/12/2019 Do an ket cau thep 2
70/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 70
Bn ni c lin kt vi bn ng bng 2 ng hn ng c lh=39cm, chn hh=6mm
ng sut trong ng hn:
2 2
741.03911.31 15
4 (0.7 0.6) 39
bn
hh
N KN KN R
F x x cm cm
1.4. Mt gia didn (Nt 5):
Ngoi cng trng dn s c khuych i nh sau:
- Ta stnh ng hn lin kt thanh cnh s8 vo 2 phn cn khuych iLc dc trong thanh cnh: N3=1044.56 KN
Lc tnh ton: Ntt= 1.2Ncd =1.2x1044.56=1253.472 KN
Din tch tnh ton quy c:
Bn mt dy 14mm, ni 2 thp gc L100x14, do phi chn bn ph c tit din l 250x14mm.
Khi d din tch tnh ton quy c c tnh nh sau:
Ftt= Fbm+Fbp =2x1.4x10 +25x1.4=28+35=63cm2.
ng sut trung bnh trong tit din tnh ton quy c:
2 2
1253.47219.896 21
63tt
tb
tt
N KN KN R
F cm cm
Lc truyn vo bn mt: Nbm= tb.Fbm=19.896x28=557.088 KN
Kim tra cng ng hn lin kt thanh a_8 vo bn mt:
Thp u cnh nn:
Chiu cao ng hn: hmin=4mm; hmax=1.2x14=16.8mm.
Chn hh=8mm => Chiu di ng hn sng cn thit l:
/ 2 557.088 / 20.7 1 0.7 1 24.25
( . ) (0.7 0.8) 15bm
hs g
h h h
Nl cm
h R.
Chiu di ng hn mp:Chn hh=6mm
8
nut nh
nut di
-
8/12/2019 Do an ket cau thep 2
71/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 71
/ 2 557.088 / 20.3 1 0.3 1 14.26
( . ) (0.7 0.6) 15bm
hm g
h h h
Nl cm
h R
Ly chiu di ng hn mp l 15cm
Tng din tch ng hn:
Fh = (h.hh)lh =2(0.7x0.8x24+0.7x0.8x12)= 40.32 cm2.
ng sut trong ng hn c kim tra nh sau:
2 2
557.08813.817 15
40.32bm
h
h
N KN KN R
F cm cm
Lc truyn vo bn ph: Nbp= tb.Fbp =19.896x35=696.36 KN
Kim tra lin kt gia bn phv thp gc cnh:
Chn hhm=12mm, tng chiu di ng hn lin kt bn ph vi thp gc cnh l:
min
696.364 4 60
( ) . (0.7 15) 1.2bp
h
g h
Nl cm
R h
Chn chiu di ng hn ngoi dc theo mp thp gc l 15cm, hh=12mm; ng hn xin l 15cm,chiu cao ng hn hh=12mm.
Tng din tch ng hn:
Fh=(h.hh)lh=2(0.7x1.2x15+0.7x1.2x15) = 50.4cm2
.ng sut trong ng hn c kim tra nh sau:
2 2
696.3613.82 15
50.4bp
h
h
N KN KN R
F cm cm
- Tnh lin kt thanh bng vo bn mt:Thanh a_5: N= 1035.92KN.
ng sut trung bnh trong tit din tnh ton quy c:
2 21035.92 16.44 21
63tt
tb
tt
N KN KN RF cm cm
Lc truyn vo bn mt: Nbm= tb.Fbm=16.44x28=460.32 KN
Kim tra cng ng hn lin kt thanh a_5 vo bn mt:
Thp u cnh nn:
Chiu cao ng hn: hmin=4mm; hmax=1.2x14=16.8mm.
Chn hh=0.8mm => Chiu di ng hn sng cn thit l:
/ 2 460.32 / 20.7 1 0.7 1 20.18( . ) (0.7 0.8) 15
bmhs g
h h h
Nl cmh R
.
-
8/12/2019 Do an ket cau thep 2
72/80
n Kt Cu Thp GVHD : Th.S. Trn Quc Hng
SVTH : Mai Xun Ton-XDLTTD12 Trang 72
Chiu di ng hn mp:Chn hh=6mm
/ 2 460.32 / 20.7 1 0.3 1 11.96
( . ) (0.7 0.6) 15bm
hm g
h h h
Nl cm
h R
Ly chiu di ng hnsng 21cm, ng hn mp l 12cm
Lc truyn vo bn ph: Nbp= tb.Fbp=16.44x35= 575.4 KN
Kim tra lin kt gia bn phv thp gc cnh:
Chn hhm=12mm, tng chiu di ng hn lin kt bn ph vi thp gc cnh l:
min
575.44 4 50
( ) . (0.7 15) 1.2bp
h
g h
Nl cm
R h
Chn chiu di ng hn ngoi dc theo mp thp gc l 15cm, hh=12mm; ng hn xin l 10cm,chiu cao ng hn hh=12mm.
Thanh 5_6: N= 92.05KN.
Chn hhs=5mm => Chiu di ng hn sng cn thit l:
/ 2 92.05 / 20.7 1 0.7 1 7.14
( . ) (0.7 0.5) 15s
hs g
h h h
Nl cm
h R
Chiu di ng hn mp cn thitl:/ 2 92.05 / 2
0.3 1 0.3 1 3.63( . ) (0.7 0.5) 15
mhm g
h h h
Nl cm
h R
Ly chiu di ng hn sng 8cm, ng hn mp l 5cm
Thanh 6_7: N= -108.94KN.
Chn hhs=5mm => Chiu di ng hn sng cn thit l:
/ 2 108.94 / 2
0.7 1 0.7 1 8.26( . ) (0.7 0.5) 15s
hs gh h h
N
l cmh R
Chiu di ng hn mp cn thit l:
/ 2 108.94 / 20.3 1 0.3 1 4.11
( . ) (0.7 0.5) 15m
hm g
h h h
Nl cm
h R
Ly chiu di ng hn sng 9cm, ng hn mp l 5cm
Thanh 7_8: N= 78.59KN.
Chn hhs=5mm => Chiu di ng hn sng cn thit l:/ 2 78.59 / 2
0.7 1 0.7 1 6.2( . ) (0.7 0.5) 15
shs g
h h h
Nl cm
h R
-
8/12/2019 Do an ket c