STRUCTURAL DESIGN OF 350KL OVERHEAD WATER TANK AT INDIRA GANDHI NATIONAL OPEN UNIVERSITY, TELIBAGH LUCKNOW1DATA1. Type of Tank:Intze Tank2. Capacity of the tank: 350KL3. Type of staging: Column!"ace type#. $epth of foun%ation: 2.5m5. &afe !ea"ing Capacity of &oil: 100K'(m2). Type of foun%ation: Ci"cula" *ing *aft foun%ation+. ,"a%e of Conc"ete: -.25/. ,"a%e of &teel: 0e.#151. 2eight of staging: 25m10. Type of soil: &oft Clay11. 2eight of !uil%ing up to Te""ace: 15.)m12. 'o. of 3oo"s in !uil%ing: ,4313. !asic 5in% 6"essu"e: 1500'(m21#. &esmic 7one of Luckno8: 7one 315. 'o.of stu%ent in College: 20001). 5ate" consumption "ate96e" capita %eman% in lit"es pe" %ay pe" hea%:: #51+. $esign pe"io% fo" tank: 30 yea"s1/. 'o.of stu%ent in hostels: 1)002OBJECTIVE1:. To make a stu%y a;out the analysis an% %esign of 8ate" tank2:. To make a stu%y a;out the gui%elines fo" the %esign of li2000Let population to ;e inc"ease% at "ate of 10? pe" %eca%e'um;e" of stu%ents 9201#: > 2000'um;e" of stu%ents in 202#>2200'um;e" of stu%ents in 203# >2#20'um;e" of stu%ents in 20## >2))2@uantity > pe" capita %eman% A 6opulation > #5 A 2))2> 1B11B+10 lit"es> 120 KL 9assume:#FLUCTUATION IN RATE OF DEMANDC=e"age %aily pe" capita %eman% in college campus > #5 lpc%If this a=e"age supplie% at all the times it 8ill not ;e suDcient to meet the 3uctuation.HOURLY VARIATION91: $u"ing the ent"y of college f"om / to 1 in the mo"ning.92: $u"ing the lunch f"om 12 to 1 in the afte"noon. 5WATER CONSUMPTION IN HOSTELC=e"age %aily pe" capita %eman% in hostels > 135 lpc%.@uantity>13) A 1)00>21) KLTotal 21) 4 130> 3#) KLE 350 KL)DESIGN REQUIREMENT OF TANKF Conc"ete miG 8eake" than -.20 is not use% ;ecause of highe" g"a%e lesse" po"osity of conc"ete.F -inimum 11A10.)(ICF CoeDcient of sh"inkage may ;e taken > #50 A 10.) fo" initial an% 200 A 10.)fo" %"ying sh"inkage.F -inimum co=e" to all "einfo"cement shoul% ;e 20 mm o" the %iamete" of main ;a" 8hiche=e" is g"eate".F Cn o=e"hea% li 0.3?9ii: 0o" thickness M #50 mm > 0.2?0o" thickness ;et8een 100 mm to #50 mm > =a"ies linea"ly f"om 0.3? to 0.2?F 0o" conc"ete thickness M 225 mmB t8o laye" of "einfo"cement ;e place% onenea" 8ate" face an% othe" a8ay f"om 8ate" face.+FROM IS -33709i: 0o" loa% com;ination 8ate" loa% t"eate% as %ea% loa%.9ii:C"acking N The maGimum calculate% su"face 8i%th of conc"ete fo" %i"ect tension an% 3eGu"e o" "est"aine% tempe"atu"e an% moistu"e eOect shall not eGcee% 0.2 mm 8ith speciPe% co=e".9iii: &h"inkage coeDcient may ;e assume% > 300 A 10.).9i=: !a" spacing shoul% gene"ally not eGcee% than 300 mm o" the thickness of the section 8hiche=e" is less./DETERMINATION OF FOUNDATIONh=pr (1sin1+sin)10017 (1sin 121+sin 12)Testing of soil sample0o" clay >12I " > %ensity of soil> 1.+) gm(cm3> 1+.) K'(m3 p > 100 K'(m3

h=2.52m 1! DETERMINATION OF HEIGHT OF STAGGING5e kno8 tu";ulent 3o8 occu"s in a pipe&o *e #0000 0.07914L > length of pipeB= > mean =elocity in pipe of 3o8 % > %iamete" of pipeh% 4 fl v22 gdR=vd2

The kinematic =iscosity of 8ate" 9: > 0.01A10.# m2(sCssume %iamete" of pipe >15 cm

Q=AV

A=4 0.152=0. .176m2> Qolume 9Q: > 350 m3Knly fo" one hou" maGimum =elocity occu"s in the pipe so the %ischa"ge %u"ing that pe"io%

Q=vt =3506060=0.097m3s

Q=AV0.01+ 0.01+) v10

v=5.52 m(sec.-aGimum =elocity >5.52 m(sec.

=vd =5.520.150.01104=8.21059K.K.:f =0.079( 8.2105)142.61103-inimum length of pipe "e SghTotal hea% > pr + v22g+z+hL+minor losses-ino" loss 9assume: > 1 m. rhr + v22g+z+hL+111 4.5+5.52229.81+15.6+5.4+1 28.08mHsing total hea% > 21.52eight of stagging > 21.5 N #.5 > 25 m12DESIGNOFTOPDOMECssume thickness of top %ome > 100 mm.-e"i%ional th"ust at e%ges T1=P R11+cos 1$ea% loa% of top %ome > 0.100 A 25 > 2.5 K'(m2Li=e loa% on top %ome > 0.+5 K'(m29assume:Total loa%6 > 3.25 K'(m2T1=3.2510318.51+cos18.92

30897.15'(m-e"i%ional st"ess > 30897.15100100=0.308 -6a T 5 -6a 9KK:-aGimum hoop st"ess occu"s at the cent"e an% its magnitu%e P R12t1 =3.2510318.520.100 0.30 '(mm2 0.3 -6aT5-6a 9KK:6"o=i%e nominal "einfo"cement of 0.2#?.

Ast=0.241001000100=240mm2Hse / mm ;a"s. A=50mm2&pacing100050240=208.3313

205 mm c(c.6"o=i%e / mm ;a"s U 205 mm c(c "a%ially an% ci"cumtentially as sho8n in Pgu"e.The 205 mm c(c fo" "a%ial ;a" is p"o=i%e% at the sp"inging of the %ome.Ct the c"o8n the spacing "e%uces to ze"o.2ence the cu"tailment of "a%ial ;a"s may ;e ca""ie% out at the app"op"iate %istance.1#DIMENSION OFTANKInne" %iamete" of cylin%"ical po"tion$ > 12 m*ise of top %ome h1 > 1 m*ise of ;ottom %ome h2 > $(/ > 1.5 m 9cent"e:0"ee ;oa"% > 0.15 m$iamete" of "ing ;eam $o > 5(/ $ > +.5 > / m*ise of ;ottom %ome 9si%e: ho > 3(1) A $ > 2.25 m > 2.5 mCapacity of tank:. 2h23R h22V= D2h4+ ho12( D2+Do2+DDo)*a%ius of ;ottom ci"cula" %ome:.1.5 A 92*2 N 1.5: > #22*2 N 1.5 > 10.)+*2 >) m&in V2 > 46 V2 > #1./o

2h23R h22V= D2h4+ ho12( D2+Do2+DDo)15350=122h4+ 212( 122+82+128) 1.52( 361.5)3350=113 h+16038.87h=2m*a%ius of top ci"cula" %ome:.1 A 92*1.1: > ) A )*1 > 1/.5 m&in V1 > )(1/.5V1 > 1/.12o$esign of top "ing ;eam:.C "ing ;eam is p"o=i%e% at the Wunction of top %ome an% the =e"tical 8all to "esisthoop tension in%uce% ;y the top %ome.2o"izontal component of me"i%ional th"ust 61 > T1 cos V1 > 30/1+.15 cos 1/.12o

> 2122+./ '(m.Total hoop tension ten%ing to "uptu"e of ;eam >P1D2 >29227.8122=175366.8 N6e"missi;le st"ess in 2X&$ ;a"s > 150 '(m2Csh > 1+53))./(150> 11+0 mm26"o=i%e 20 mm ;a"s 931#.15: as hoop.'um;e" of 12 mm ;a"s > 11+0 ( 31#.15 > 3.+2 > #1)CctualCsh > # A (# A 202 > 125).)3 mm2 > 125+ mm26"o=i%e #.20 mm Y hoop an% / mm ;a"s tie U 205 mm c(c.2ence the c"oss sectional a"ea of conc"ete1.3 175366.8A+12578Cc > 12#/#1.536"o=i%e "ing ;eam of 320 mm A #00 mm.1+$esign of cylin%"ical 8all:.In the mem;"ane analysis the tank 8all is assume% to ;e f"ee at top an% ;ottom maGimum hoop tension occu"s at the ;ase of the 8all an% its magnitu%e:.>rwhd2=9800h122=58800h2oop tension at any %epth G f"om the topZ 9m:2oop tension 9'(m: 00 1 5//00 2 11+)00-inimum thickness of cylin%"ical 8all > 3 2 4 5 > 3 A 2 4 5 > 11 cm.6"o=i%e 20 cm at the ;ottom an% tape" it to 12 cm at top.CtG > 1 m.C"ea of steelCsh > 5//00(150 > 312 mm26"o=i%e / mm ;a"s.CY > 50.2) mm2&pacing > 91000 A 50.2): ( 312 > 130 mm c(c.CtG > 2 m.C"ea of steelCsh > 11+)00(150 > +/# mm26"o=i%e 10 mm ;a"s.CY > +/.53 mm2&pacing > 91000 A +/.53: ( +/#1/ > 100 mm c(c.The hoop steel may ;e cu"taile% acco"%ing to hoop tension at %iOe"ent height along the 8all p"o=i%e% 0.2#? of minimum =e"tical "einfo"cement.C=e"age thickness of 8all> 91204200: ( 2 > 1)0 mm.Csh > 0.241601000100=384 mm26"o=i%e / mm Y. CY > 50.2) mm2&pacing > 50.261000384=130 mm c(c.$esign of "ing ;eam !3:.Thickness >100 mm*ise > 1.5 m 9cent"e:!ase %ia. > / m*ai%us of cu"=atu"e> ) mCos #1./o > 0.+#5The "ing ;eam connect the tank 8all 8ithin conical %ome. The =e"tical loa% at theWunction of the 8all 8ith conical %ome is t"ansfe""e% to the "ing ;eam !3 ;y ho"izontal th"ust. In the conical %ome the ho"izontal component of th"ust causes hoop tension at the Wunction.5>Loa% t"ansfe""e% th"ough the tank 8all at the top of conical %ome ( unit length.11[o >Inclination of conical %ome.T>-e"i%ional th"ust in conical %ome at the Wunction.tan [o > 2(2.5[o > 3/.)5 > 30/1+.15 sin 1/.12

> 1001/.32 '(m9ii: Loa% %ue to "ing ;eam !1 > 320 mm %epth> #00 mm 8i%th > 0.32A90.#.0.1:A1A25000 > 2#00 '(m9iii: Loa% %ue to tank 8all> 2(0.12+0.22)125000> /000 '(m9i=: &eif loa% of ;eam !391m A 0.)m say: >91.0.3: A0.)A25000 > 10500 '(mTotal5 > 1001/.32 4 2#00 4 /000 4 10500> 3011/.32 '(m&in [o > sin 3/.)5 > 0.)2B cos 3/.)5 > 0.+/0o"ce 68 %ue to loa%681 > 5 tan [o > 3011/.32 tan 3/.)5> 2#+25.1+ '(m0o"ce 68 cause% %ue to 8ate" p"essu"e at top of conical %ome682 > "8 A h%3h > %epth of 8ate" upto cent"e of "ing ;eam%3 > %epth of "ing ;eam682 > 1/00 A 2 A 0.) > 11+)0 '(m202ence hoop tension in the "ing ;eam is gi=en ;y :.6 >(P w1+Pw22)D > (24725.97+117602)12=218915.82NThis is to ;e "esiste% ;y steel hoops the a"ea of 8hich isCsh > 218915.82150> 1#)0 mm2Hse 20 mm ;a"s > 31#.15'um;e" of 20 mm ;a"s > 1460314.15=4.64> 5 ;a"s2ence p"o=i%e 5 "ing of 20 mm %ia ;a"s.Cctual a"eaCs > \(# A 20 A 5> 15+0 mm2&t"ess in e 218915.82(1000600)+101570 > 0.35 '(mm2 T 1.2 '(mm29&C0J: 9KK:The 10 mm %iamete" %ist"i;ution ;a"a 9=e"tical ;a"s: p"o=i%e% in the 8allU 100 mm c(c shoul% ;e taken "oun% the a;o=e "ing to act as sti""ups.$esign of conical %ome :.9a:-e"i%ional th"ust :.58 > Total 8eight of 8ate" on the conical %ome5 > 5eight of top %omB cylin%"ical 8all etc.5s > &elf 8eight of conical %ome2158 > rw[4 (D2+Do2)+ 12(D2+DDo2+D Do)4 Do2ho] >9800[ 4 (122+82)+ 122.5(122+82+128)4 822.5] >9800[ 326.72+198.96125.67] >312001/ 'Let the thickness of conical sla; > #00 mm58 > [ (+Do2)l t0]rc l > 2.52+22 > 3.2 m5s > 25000(12+82)3.20.4> 1005301.)#1 '5eight 5 at !3 > 3011/.32 '(m.2ence =e"tical loa% 52 pe" met"e "un is gi=en ;y52 > DW+Ww+WsDo > 1230918.32+3920098+1005309.64 8 >2#2353.22 '(m-e"i%ional th"ust To in the conical %omeTo > 52 ( cos [o > 2#2353.22 ( cos 3/.)5 > 310321.0) '(m.-e"i%ional st"ess> 310321.0) ( 91000A#00: > 0.++5 '(mm2T 5 '(mm2 9&afe:.229;: 2oop st"ess $iamete" of conical %ome at any height h] a;o=e ;ase is$] > / 4 912./:(2 A h] > / 4 2h]Intensity of 8ate" p"essu"e 6 > ^9#42:.h]_A1/00 > ^).h]_1/00 '(mm2&elf 8eight < > 0.# A 25000> 10000 '(mm22oop tension Po

=(pcos! o+"t#n!o)D

2(( 6h

) 9800cos38.65 +1000 tan38.65)((8+2h

) )20.#/ 4 125#/.# h]2 4 125#/.#h]2 "# H$$% T&'()$' 0 333150.#/ ' 1 353)15.#1 ' 2 3#11##./) ' 2.5 33+#5+.15 '0o" maGimum d Po

d h

=033013.11 N 2501)./ h]> 0 h]> 1.31 m.-aGimum6o] > 35#1)1.21++ '239c: $esign of 8alls:.-e"i%ionalst"ess > 0.++5 '(mm2-aGimum hoop st"ess > 35#1)1.21 '5hich is to ;e "esiste% ;y steelCs > 35#1)1.21(150> 23)).#) mm2C"ea of each face > 11/3.23 mm2&pacing of 1) mm %ia ;a"s > 91000 A 201:(11/3.23> 1+0 mm c(c2ence p"o=i%e 1) mm %ia hoops U1+0 mm c(c on each face.CctualCs > 91000 A 201:(1+0> 11/2 mm2-aGimum tensile st"ess in composite section > 354969.29(4001000)+(2118210)>0./3 '(mm2T 1.2 '(mm2 9&afe: 9KK:In the me"i%ional %i"ection the "einfo"cement > .214001000100 > /#0 mm2K" #20 mm2 on each face Hse 10mm %iamete" ;a"s C > +/.53 mm2 &pacing > 100078.53420> 1/0 mm c(c2ence p"o=i%e 10 mm ;a"s U 1/0 mm c(c on each face 8ith a clea" co=e" 20 mm$J&I,' K0 !KTTK- $K-J*2> ) mV2> #1./5eight of 8ate" on 80 on the %ome is gi=en ;y 2#50> [4 D02$0% $223(3R2h2)]`8 $0>/B20 >2.5 B*2>)Bh2>1.5B 50>/50#+1.35'Let the thickness of ;ottom %ome >250mm&elf 5eight 5s >2\*2h2t2A25000*2>)B h2>1.5B t2>0.255s>353#21.1+'Total 5eight>1203100.52'-e"i%ional thu"st>T2> 1203900.52 Dosin 41.8$0>/T2>+1/)).1/'(m-e"i%ional &t"ess>718866.982501000 >0.2/+'(mm2 T5'(mm2safe o.k.Intensity of loa% pe" unit a"ea62>1203900.522 R2h2*2 >)Bh2>1.562>212/1.)3'(m2-aG hoop st"ess at cent"e of %ome P2 R22t2>( 21289.636)2.25 >255#+5.)25'(mm2 >0.25'(mm2 T5-6a K.K.25C"ea of min steel>0.26250 1000100 >)50 mm2in each %i"ectionHse 10 mm V ;a"s&pacing>100078.5650 >120mm2ence p"o=i%e 10mm a ;a"s U 120mm c(c in ;oth %i"ection also p"o=i%e 1)mm Y me"i%oinal ;a"s U1+0mm c(c nea" 8ate" face.$esign of ;ottom ci"cula" !eam !2In8a"% th"ust f"om conical %ome >T0&inYo >310321.0) &in3/.)5 >113/1#.5 '(mKut8a"% th"ust f"om ;ottom %am>T2cosV2

>+/)).1/cos#1./>5)12).3)'(m'et in8a"% th"ust>13+)//.1#'(m2oop comp"ession in ;eam >13+)//.1#A/(2 >550+52.5)'Qe"tical loa% on ;eam Bpe" mete" "un>T0CosY04T2&inV2>310321.0) Cos 3/.) 4+1/)).1/ &in #1./>210#23.13 '(m&elf 8eight of ;eam>0.)A1.2A25000 >1/000'(mTotal loa% on ;eam>210#23.1341/000>30/#23.10'(mLet us suppo"t the ;eam on / e#m0o" suppo"t /:.coeDcient of !.2.t8isting moment in ci"cula" ;eam2)2V>#5o C1>0.0))BC2>0.030BC3>0.005[m>1.5o BV>\(#>22.5>\(/ *a%ius8*2V>30/#23.1A#2A\(#>3/+5+)1.#-aG N=e !.-.at suppo"t -0>C18*22V>255/00.+/'.m-aG 4=e !.-. at suppo"t -c>C28*22V>11)2+3.0/'.m-aG to"sional moment &mt>C3 8*22V >113+/./#'m0o" b c;c>/.52ys% ;a"sbst>150 '(mm2'eute"al aGis %epth facto" 9K:K>m'c(cm'c(c+'st m>2803'c(c>28038.5>10.1/ >10.988.510.988.5+150>0.3/3Le=e" C"mc>1.K(3>0./+2*>1(2Abc;cAcAk>1(2A/.5A0./+2A0.3/31.#1-">*;%2*e< eO. $epth 9%:.255/00.+/>1.#1A)00A%2

%>550mm2+2o8e=e" keep total %epth >+00mm f"om shea" point of =ie8.-aG shea" fo"ce at suppo"t0o>5*V>30/#23.1A#A\(/ >#/##+1.12'&.0. at any point 0>5*9V.d:>30/#23.1A#A922.5.1.5: A\(1/0 >2+111).)'!.-. at the pointy of maG to"ssional moment dm>1.50-d>5*29V&ind4VCosVCosd.1: sagging>30/#23.1A#2A9\(/Asin1.54\(/Acot22.5Acos1.5.1: >#13#.+/'msaggingThe to"sion moment at any point.-pt>5*2^Vcosd.Vcosdsind.9V.d:_Ct the suppo"td>0-0t>5*2 9V.d:>0Ct the mi% span d>V>22.5>\(/ "a%ian-dt> 5*2^VcosV_.[cos)sin) sin)]5e ha=e the follo8ing com;ination of !.-.to"sional moment:.9a: at the suppo"t -0 >255/00.+/ '- 9hogging o" negati=e: -0t>0 2/