International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
THE EFFECT OF PARTIAL CONSTRUCTION IN 3D-MULTISTORIED FRAME
Applav1 , Dr. Sunil Kumar2
1PG Student, Department of Civil Engineering, HBTU, U.P, INDIA
2Professor, Department of Civil Engineering, HBTU, U.P, INDIA ***
Abstract –
Multistoried buildingshavebeenanalyzedforyearon the assumption that whole of the load is applied on the completed frame. Looking into the mode of incidence of the load or various stage of partial construction, it is evident that part of the load is applied in stages as the construction of the frame proceeds, where as the remaining part of it is imposed on completion of the frame. Unfortunately, the aspect of partial construction of the frame due to any reasons has been over looked till now by engineers, although its effect on the final stresses of the frame is quite considerable.
Computer aided analysis of building system is considered in present work by considering the self-weight, Dead loads, Live Loads & Earth-quake loads with different load cases and later the effect of partial construction is studied. The building system consists of slabs supported on beams which are framed into columns and foundations. The software STADPRO V8i is used for analysis.
Initially Three dimensional six storied is considered under various combination of loading as per IS 456:2000 and later different modes of partial construction are chosen by eliminating either some storeys or bays. At each instant the variation in bending momentsandaxialloadsovercolumn has been studied.
The comparative study between main frame and different modes of partial construction is being done. It is evident from this study that during analysis of multistoried frame, the mode of partial construction should be pre-defined, if constructed in phases.
Key Words: partial construction, building system, multistoriedframe,differentmodes,loadcases.
1. INTRODUCTION
Safety, Serviceability and Economy are the basic qualities which all structures should possess during their designedlifespan.
Analysisanddesignofstructuresconstitutethetwo major activities in Structural Engineering practices. Generally,structuralanalysisanddesignaretwomutually
coupled processes. The results of the analysis decide the choiceofvariablesinthedesign
Generally, multistoried building frames have been analyzeinasinglestepascompleteframebyconsideringthe selfweight,deadloads,liveloads&earth-quakeloadswith differentloadcasesactingonthebuilding.Theperformance ofstructurewithvariousloadappliedinsinglestepdiffers significantlyfromthatwhenthestructureisconstructedin differentcases[i.e.stagesofpartialconstruction].
Thestructuralanalysisofmultistoriedbuildingison oftheareasthathaveattractedtheengineeringresearchers &designerattention.Thereisareaofpartialconstruction, however, which has been ignored by many designers till now.
In this study we are considering 3D multistoried frameundervariouscombitionofloading&laterdifferent modeofpartialconstructionareconsideredbyeliminating eithersomestoreys&bays.
2. Work Methodology
2.1 General
Inthepresentwork,softwarepackageSTAAD.ProV8iis usedtoanalysistheTHREEDIMENSIONAL SIXSTOREYED building frame under combination of Dead, Live load and SeismicLoad.Later,weconsiderdifferentmodesofpartial construction.Theconsideredmodesofpartialconstruction are mentioned in Article 3.3. The effect of each mode of partialconstructionistobenotedincolumnsincomparison withmainsixstoriedstructure.
Thisisarealproblem,generallyoccursinpracticallife thatbuilderstakedesignanddrawingofcompletestructure butconstructonlysomepartduetovariousconstraints(i.e. financial,timerequirementetc.)
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
2.2 Details of Building
Thedetailsofthemainbuildingaregivenbelow:
Table 2.1 –ParametersofMainBuilding S.No. Particulars Description 1 No’sofStorey’s 6 2 No’sofBaysinX-direction 3 3 No’sofBaysinZ-direction 2 4 No’sofjoints 84 5 No’sofmember 174 6 TypeofBuilding Mercantile 7 City Lucknow 8 EarthquakeZone IV 9 SoilType MediumSoil 10 Importancefactor 1.5 11 BuildingFrameSystem OrdinaryRC momentresisting frame 12 ZoneFactor 0.16 13 StoreyHeight 3.00m 14 Gradeofconcrete M25 15 Gradeofsteel Fe500
2.3 MODES OF PARTIAL CONSTRUCTIONS:
The following modes of partial construction were consideredforcomparativestudy:
Case–I:Onebayofspan =5.00misremovedfrom sixthstorey.
Case-II:Onebayofspan =5.00misremovedfrom fifthandsixthstory.
Case-III: The building is constructed up to fourth floor.
Case-IV: The building is constructed up to second floor.
Case-V:Thebuildingisconstructeduptofirstfloor.
Themainframeandallfivecasesofpartialconstruction were analyzed and designed by using software STAAD.ProV8i. These six models were used for the comparison of response of various forces in terms of axial force, bending moments and shear forces in differentloadingcombinations.
2.4 Loads
InthecurrentworkcombinationofSelf-weight,Dead Loads,LiveloadsandEarthquakeloadsistakeninaccount. TheloadsareconfirimingtoIS875 (part1&part2)andIS 1893(part1):2002.
3. Modelling of Structure
3.1 General
Data preparation for structural analysis problem basicallyinvolved,(1)describingthestructuralgeometry,(2) definingthestaticand/ordynamicloadconditionsforwhich thestructureneedstobeanalyzed.
3.2 Problem Statement
Thedetailsofmainproblemtakeninthisworkareas below:
Typeofbuilding =Mercantile Nos.ofbaysinX–direction = 3 Nos.ofbaysinZ–direction = 2 Nos.ofstorey = 6 Nos.ofJoints = 84 Nos.ofmembers = 174 Thicknessofslab = 125mm(M25)
Details of beams:
Table 3.1 - DimensionsofBeamsSection
SPAN FIRST&LAST PORTAL INTERMEDIATE PORTAL MIX
(M) B(mm) D(mm) B(mm) D(mm) 4.0 230 350 230 450 M25 5.0 230 550 230 650 M25
Details of columns:
Table 3.2 - DimensionsofColumnsSection
LOCATIONOF COLUMNS
FIRST&LAST PORTAL (mm)
INTERMEDIATE PORTAL (mm)
MIX
EXTERIOR 300X400 300X500 M25 INTERIOR 300X450 300X650 M25
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
Details of loading on beams: Table 3.3:- Loadingonbeams
SPAN (M) LOCATIONOFBEAMS ATFLOORS (KN/m) ATTERRACE (KN/m)
4.0 ENDBEAM 17 14
INTERMEDIATE 25 21 5.0 ENDBEAM 20 16 INTERMEDIATE 30 26
3.3 Main Model
Figure3.1:THREEDIMENSIONALSIXSTOREYEDFRAME
3.4 Different Models
The different modes of partial constructionare as follows:
Case-I: Onebayofspan = 5.00misremovedfrom sixthstorey[Referfigure3.2]
Case-II:Onebayofspan = 5.00misremovedfrom fifth&sixthstorey[Referfigure3.3]
Case-III:Thebuildingisconstructeduptofourthfloor [Referfigure3.4]
Case-IV:Thebuildingisconstructeduptosecondfloor [Referfigure3.5]
Case-V: The building is constructed up to first floor [Referfigure3.6]
Figure3.2: CASE-IOFPARTIALCONSTRUCTION FRAME[Onebayofspan5misremovedfrom6thstorey]
Figure3.3: CASE-IIOFPARTIALCONSTRUCTION FRAME[Onebayofspan5misremovedfrom5thand6th storey]
Figure3.4: CASE-IIIOFPARTIALCONSTRUCTION FRAME[Buildingconstructeduptofourthfloor]
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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
Figure3.5: CASE-IVOFPARTIALCONSTRUCTION FRAME[Buildingconstructeduptosecondfloor]
Figures5.1Planofcolumnslocations
6. Discussion
6.1 Column no.1
Thegraphforaxialload(Pu)andbendingmoment (Mz)areasfollows:
Figure3.6: CASE-VOFPARTIALCONSTRUCTION FRAME[Buildingconstructeduptofirstfloor]
4. Analysis
All structures may be analyzed by the linear elastic theorytocalculateinternalactionsproducedbydesignloads. In the present work we have used the software STAAD.ProV8ifortheanalysis.
5. Comparative Study
The different modes of partial construction were analyzed. These modes were chosen by eliminating either somestoreyorbays.Ateachinstantthevariationinbending moments and axial loads for various members has been studied.Thevariationinmomentsinaxialloadincolumns withrespecttomaincompleteframeistobeperformed
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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
6.2. Column No.2
Thegraphforaxialload(Pu)andbendingmoment (Mz)areasfollows:
Afterthedetailstudyfromtheresultsandgraphthat thedesignofcolumnsectionobtainedfrommaincomplete frame analysis & design.It needs scrutiny of the proposed sectionatfollowingfloorlevel,ifconstructedinanyoneof themodesofpartialconstruction:
i. Ifthebuildingisconstructedincase-I(i.e. onebayofspan5.00misremovedat6th storey) of partial construction in place of maincompleteframethencolumnNo:1is criticalat4thfloor
ii. Ifthebuildingisconstructedincase-II(i.e. onebayofspan5.00misremovedat5th& 6thstorey)ofpartialconstructioninplace ofmaincompleteframethencolumnNo:1 iscriticalat3rdfloor
iii. Ifthebuildingisconstructedincase-III&IV thandesignofmaincompleteframehasno scopeofcheckthisColumn.
iv. Ifthebuildingisconstructedincase-V(i.e. building is constructed up to 1st floor) of partial construction in place of main complete frame then column No: 1 is criticalatGroundfloor.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
Afterthedetailstudyfromtheresultsandgraphthat thedesignofcolumnsectionobtainedfrommaincomplete frame analysis & design.It needs scrutiny of the proposed sectionatfollowingfloorlevel,ifconstructedinanyoneof themodesofpartialconstruction:
i. Ifthebuildingisconstructedincase-I(i.e. onebayofspan5.00misremovedat6th storey) of partial construction in place of maincompleteframethencolumnNo:2is criticalat4thfloor.
ii. Ifthebuildingisconstructedincase-I(i.e. onebayofspan5.00misremovedat6th storey) of partial construction in place of maincompleteframethencolumnNo:2is criticalat3rdfloor.
iii. Ifthebuildingisconstructedincase-II((i.e. onebayofspan5.00misremovedat5th& 6thstorey)ofpartialconstructioninplace ofmaincompleteframethencolumnNo:2 iscriticalat3rdfloor
6.3. Column No.3
Thegraphforaxialload(Pu)andbendingmoment (Mz)areasfollows:
After the detail study from the results and graph that,if the building is constructed in any mode of partial constructioninplaceofmaincompleteframethancolumn No: 3 has no scope to check in any mode of partial construction,henceprovidedsectionofmaincompleteframe isadequate
Comparativestudyforothercolumnswillbedone separately.
7. Conclusions
a) Thefollowingareevidentfromabovestudy:
i. IfthebuildingisconstructedinCase-I(ie.onebayof span5.00misremovedat6thstorey)ofpartial constructionthanthecolumnno.1,2,5,6,7&8 wereredesigned.
ii. IfthebuildingisconstructedinCase-Il(i.e.Onebay ofspan5.00misremovedat5th&6thstorey)of Partialconstructionthanthecolumnno.1,2,5,6, &7wereredesigned.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
iii. IfthebuildingisconstructedinCase-V(i.e.building constructed up to first floor) of Partial construction than the column no. I was redesigned.
b) Asfromabovestudyitisseenthatinsomecasesof partialconstructioncolumnmomentsandaxialload bothincrease.
c) Natureofcolumnmomentsmaychangeindifferent mode of partial construction, such as some of the columnsdesignedforaxialloadsmaybesubjected to uniaxial and biaxial bending under partial construction.
Ifmagnitudeofcolumnmomentsandaxial loads increases or nature of column moments in differentplanechanges,thenitshouldbeconsidered indesignforsafetyandserviceabilityofstructure.
d) Morerationalandeconomicaldesigncanbedoneby consideringtheeffectsofpartialconstructions.
e) Asisevidentfromabovediscussion,itisconcluded thatinanalysisofmultistoriedstructure,themode of partial construction should be pre-defined, if constructedinphasesanditsbehaviourshouldbe takenintoaccount.
8. Future Perspective
ThereisanimmensescopeinthisfieldofCADfor futurework.Limitedmodesofpartialconstructionareused in present study. Wind loads have not been considered at present.However,thiscanbeaddedtotheworkwithlittle effort,buthasbeenleftoutduetolackoftime.
Theworkcanbeextendedtocarryoutthewindanalysis. Aninterfacebetweenanalysescanbedeveloped.
9. Reference
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