caandos _ lecture 01 _ slides 45-71

7/25/2019 CAAnDoS _ Lecture 01 _ Slides 45-71

1/14

uhammad

Ali

JInnah

University,

amabad

Campus

10/3/

Muhammad Ali Jinnah University, Islamabad CampusDepartment of Civil Engineering



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uhammad

Ali

JInnah

University,

amabad

Campus

10/3/




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uhammad

Ali

JInnah

University,

amabad

Campus

10/3/




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uhammad

Ali

JInnah

University,

amabad

Campus

10/3/




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uhammad

Ali

JInnah

University,

amabad

Campus

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uhammad

Ali

JInnah

University,

amabad

Campus

10/3/




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uhammad

Ali

JInnah

University,

amabad

Campus

10/3/




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uhammad

Ali

JInnah

University,

amabad

Campus

10/3/



LIMITATIONS OF STRUCTURAL ANALYSIS & DESIGNThere is no single reference document available to recommendanalysis and design parameters for such tanks for followingreasons:-Pakistan (BCP) - 2007 which refers mainly to UBC-1997 and ACI-318-05.- One of available ACI documents for Pedestal-mounted steeltanks is ACI 371R-98. The revised version of this document wasreleased in 2008 (ACI 371R-08) with certain modifications andencompassing the topic in more detailed manner.- qu va en s a c proce ure s ou ne n - anASCE 7-05 but these codes suggest site specific accelerationamplification which make it difficult to use ACI 371R-08 strictlyfor regions outside United States. Therefore, the concept ofequivalent static procedure is taken from ACI 371R-98 and thestepwise procedure to be adopted for Pakistan region is takenfrom UBC-1997 (ASCE-7-95) / BCP-2007.


9/14

uhammad

Ali

JInnah

University,

amabad

Campus

10/3/


External Stability Checks (Approx. method)0.40

0.20 forZone2BSE SOFTSOIL

1.25

Slidingcoefficient, (GeoTechreport)

ZoneFactor,Z(Ref.Table16I)SiteSoilCoefficient(Ref.Table16J)

SeismicImportanceFactor,I(Ref.Table16K)

2.20 forNonbuildingStructure

0.34

0.64

B M=10kmdistance

1.00 10kmdistance

0.03 forConcreteStructure

and hn hei ht of the structure above the base

Structural System,RFactor(Ref.Table16P)

Ca(Ref.Table16Q)

Cv(Ref.Table16R)

SeismicSourceType(Ref.Table16U)

NearSourceFactor,Na(Ref.Table16S)

NearSourceFactor,Nv(Ref.Table16T)

TimePeriod,Ta=Ct(hn)^0.75

Where,Ct

From Sap

. .

0.87 sec

1.22 sec

1,000 kips

50,000 Gallons

502 kips

1,502 kips

,

So,Ta=Ct(hn)^0.75

Tb=1.3xTa(say)

DeadLoadofSuperStructure

DeadLoadofWater

TotalDeadLoadAbovebase,P

DeadLoadofWater


Ds 36 ft

A 1018 sft

Vr 50000 gallons

Extra 25 %

Vd 62500 gallons

Vd 8375 ft3

Waterweight

D 150 pcf

Hmax 5.5 ft

Hmin 2.5 ft

Di 35 ft

Raftweight

Ww 523 kips

He 8.2 ft

Ds/He 4.4

Convective 0.7

Impulsive 0.26

Total 0.96

Ww 502 kips

Do 55 ft

Ai 962 ft2

Ao 2376 ft2

Av 1414 ft2

Vi 5292 ft3

Vv 5655 ft3

Vt 10946 ft3

W 1642 kips


10/14

uhammad

Ali

JInnah

University,

amabad

Campus

10/3/


1,502 kips

449 kips

725 kips70 kips

449 kips

CaseI.WhenTankisfull

SeismicWeight(W)

TheBaseShearasperUBC1997Codeis,V=(CvI/RT)xW

Max.BaseShear,Max.V=(2.5CaI/R)xWMin.BaseShear,Min.V=(0.11xCaI)xW

TheDesignBaseShear,V

38 kips

112 kips

38 kips

2.0

60.0 ft

30,330 kipft approx.

1.0 in

80.0 ft

OverturningMoment,=(V)(h)+(Ft)(hN)

AllowableFOS

PointofVabovebase,h

a.OverturningCheck

eo

lg

Ft


11/14

uhammad

Ali

JInnah

University,

amabad

Campus

10/3/


1,000 kips

299 kips

483 kips

47 kips

299 kips

CaseI.WhenTankisempty

SeismicWeight(W)

TheBaseShearasperUBC1997Codeis,V=(CvI/RT)xW

Max.BaseShear,Max.V=(2.5CaI/R)xWMin.BaseShear,Min.V=(0.11xCaI)xW

TheDesignBaseShear,V

25 kips

75 kips

25 kips

2.0

60.0 ft

20,193 kipft approx.

1.0 in

80.0 ft

AllowableFOS

PointofVabovebase,h

OverturningMoment,=(V)(h)+(Ft)(hN)

eo

lg

a.OverturningCheck

ForceatTopofthestructure,Ft=0.07TV

Ft


12/14

uhammad

Ali

JInnah

University,

amabad

Campus

10/3/


CLASS PROJECT


PART-1: Design the same tank for following parameters:-Net allowable bearing capacity = 1.5 TSF at 12'-0" below N.S.L-Effective allowable bearing capacity = 1.3 TSF at 12'-0" below N.S.L-No increase in allowable bearing capacity due to seismicity is permitted- = .

ZoneSoil

Type

Grid

dimensions

(ft)

Conc A fc'

(psi)

Conc B fc'

(psi)fy (psi)

Modifiers

etc.Remarks

1 DCE153001 SYEDA AAMARA ASIF 2A SE 3750.101 3000.101 60000.101

2 DCE153003 WAQAS SHAHID 2A SD 3750.103 3000.103 60000.103

3 DCE153004 MUHAMMAD USMAN FAROOQI 2A SC 3750.104 3000.104 60000.104

4 DCE153006 ISRAR UL HAQ 2A SB 3750.106 3000.106 60000.106

5 MCE153003 MUHAMMAD MUNIR 2B SE 3750.203 3000.203 60000.203

Sr. no. Registration Name

Input data

Add 0.XXX

in each

dimension

except 0.

Add

0.0XXX in

each

modifier,

multiplier

Input data for studentsCourse:CE6323 - Computer Aided Analysis and Design of Structures

Instructor:Dr. Majid Ali

6 MCE153004 MUHAMMAD ZOHAIB HASSAN 2B SD 3750.204 3000.204 60000.204

7 MCE153006 TARIQ MEHMOOD 2B SC 3750.206 3000 .206 60000 .206

8 MCE153008 MUHAMMAD HASEEB AHSAN 2B SB 3750.208 3 000.208 60000.208

9 MCE153011 MEHRAN KHAN 3 SE 3750.211 3000.211 60000.211

10 MCE153012 ALI REHMAN 3 SD 3750.212 3000 .212 60000 .212

11 MCE153013 WAQAR SIDDIQUE ALI 3 SC 3750.213 3000 .213 60000 .213

12 MCE153015 ASAD ZIA 3 SB 3750.215 3000.215 60000.215

13 MCE153016 IQBAL AHMAD 4 SE 3750.216 3000.216 60000.216

14 MCE153019 ASAD IQBAL 4 SD 3750.219 3000.219 60000.219

15 MCE153021 FAHEEM AHMAD GUL 4 SC 3750.221 3000.221 60000.221

16 MCE153022 MUHAMMAD YASSEEN 4 SB 3750.222 3000.222 60000.222

17 MCE153025 FARHEEN KANWAL 1 SE 3750.225 3000 .225 60000 .225

18 MCE153026 HAFIZ MUHAMMAD NABEEL 1 SD 3750.226 3000 .226 60000 .226

and scale

factor.


13/14

uhammad

Ali

JInnah

University,

amabad

Campus

10/3/


PART-2: Drawings have been issued at site and the contractor hadstarted the project for its execution. During the excavation for

foundation, certain facts were revealed. How will you respond with minimumchanges in design output within minimum time? Certain facts will be

.

REQUIREMENTS: Develop models in SAP and SAFE (soft copy)

Marks:PART-1: 15%PART-2: 5%

Create structural drawings (soft and hard copy, A3 size)

Analysis and design report, internal & external checks (soft and hard copy, A4 size)

Analysis and design summary (soft and hard copy, A4 size)

Justify analysis and design (Part-1 Presentation)

Alternate design approach for varying site conditions (Part-2 Presentation)


SAP MODELLING


14/14

uhammad

Ali

JInnah

University,

amabad

Campus

10/3/


Any question !

caandos _ lecture 01 _ slides 45-71

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