Seismic Behaviour of Multistorey RC Frame with Shear wall and Octagrid Sructure

International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072

Seismic Behaviour of Multistorey RC Frame with Shear wall and Octagrid Sructure

1 UG Student, Dept. of Civil Engineering, Rajarambapu Institute of Technology, Rajaramnagar, Maharashtra, India. 2Professor, Dept. of Civil Engineering, Rajarambapu Institute of Technology, Rajaramnagar, Maharashtra, India ***

Abstract - In this paper total six Octagrid buildings are modelled and analyzed for earthquakeandgravityload.Three buildings have been modelled with 3m, 6m and 9m Octagrid modules and three with shear wallwithOctagridmodules.The floor plan of 18m x 18m and 19 storey building is considered here. The comparison of parameters like base shear, overturning moment, storey drift and storey displacement is done between buildings to determine efficient alternative. Response spectrum method is used for dynamic analysis. STAAD. Pro software is used for modelling and analysis of buildings.

Key Words: Octagrid, Shear wall, Response spectrum analysis, Storey drift, Storey displacements, Base shear, Overturningmoment,etc…

1. INTRODUCTION

Now a days due to increase in population cost of land is increasing and therefore there is limitations on land availability.Scarcityoflandshowspictureofconstructionof highrisebuildings Highrisebuildingsrequireslateralload resistingsystemforstability Becauseasheightofbuilding increases lateral applied loads increases. So early tall buildings were having lateral load resisting systems like bracing systems, trusses, tubular structure, shear wall buildings.NowadaysDiagrid,Hexagrid,Octagridstructures are being used as lateral load resisting systems. These patterns are arranged at perimeter of structure. External columnsareabsentinthisstructure.Thesestructuresare madeupofhorizontal,vertical,andinclinedmembers.This patterns resists shear by carrying load axially which provides stiffness and strength against horizontal shear Thesestructuresconsumeslessamountofmaterialandare aestheticallybeautiful.

ObjectiveofthestudyistomodelandanalyzeRCframewith varying sizes of Octagrid pattern and shear wall building with varying sizes of Octagrid pattern and compare the parameters like storey drift, storey displacements, base shearandoverturningmomentbetweenthebuildings.

2. BUILDING DESCRIPTON

Thefloorplanof18mx18m,buildingheight57mandstorey height3misconsidered.Locationofshearwall istakenat center.Octagridofvaryingsizesi.e3m,6m,and9mOctagrid

modules are used to modelling and analyze the buildings. Total six buildings are modelled and analyzed. Three buildingshavebeenmodelledwith3m,6mand9mOctagrid modulesand3withshearwall atcenterwith3m,6m,9m Octagridmodulesatperiphery.

Table -1: Description

FloorPlan 18mx18m

BuildingHeight 57m StoreyHeight 3m

NumberofStoreys 19

Shearwalllocation Center ThicknessofShearwall 150mm ColumnSize 600mmx600mm

BeamSize 450mmx450mm

Octagrid 300mmx300mmx15mm

GradeofConcrete M20

GradeofSteel Fe550

DeadLoad 4.75kN/m2

LiveLoad 4kN/m2

SeismicAnalysisMethod ResponseSpectrumAnalysis

SeismicZone III(Zonefactor0.16)

Soiltype Medium

Responsereductionfactor 5

Importancefactor 1.5

DampingRatio 0.05

International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072

3. MODELLING

Fig -1:PlanView

Fig -2:Locationofshearwall

Fig 3:3Dviewof3mOctagridmodulebuilding

Fig 4:3Dviewof6mOctagridmodulebuilding

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International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

Fig 5:3Dviewof9mOctagridmodulebuilding

Fig 7:Wireframeviewofshearwall+6mOctagridmodule building

Fig -6:Wireframeviewofshearwall+3mOctagridmodule building

Fig 8:Wireframeviewofshearwall+9mOctagridmodule building

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International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072

4. ANALYSIS AND RESULTS

4.1. STOREY DRIFT

Chart 1:Storeydrift

Permissible maximum storey drift as per IS 1893 part1: 2002 is 0.004h = 0.004*3= 0.012m, where h= Height of storey. The values of storey drift of all the buildings for earthquake load in both X & Z directions are within limit. Frames with varying sizes of Octagrid pattern shows less storeydriftcomparetoshearwall+Octagridbuildings.6m and9mOctagridbuildingshowslesstopstoreydrift1.002 mmand1.02mmrespectivelycomparetoothermodels.

4.2. STOREY DISPLACEMENT

Chart - 2:Storeydisplacement

Permissible maximum storey displacement as per IS1893 part1:2002,isH/500=57/500=0.114m,whereH=Heightof building. The values of storey displacement of all the buildingsinbothX&Zdirectionsforearthquakearewithin limit.Shearwall+Octagridbuildingsshowslesstopstorey displacement compare to Octagrid buildings. Shear wall buildingswith3mand9mOctagridshowsleasttopstorey displacement 23.112 mm and 25.94 mm respectively

comparetootherbuildings.

4.3. BASE SHEAR

Chart 3:BaseShear

BaseshearislessforframeswithvaryingsizesofOctagrid pattern than shear wall+ Octagrid buildings. 6 m and 9m Octagridbuildingarehavingleastbaseshear964.32kNand 953.35kNrespectively.Asmodulesizeincreasesbaseshear decreases.

4.4. OVERTURNING MOMENT

Chart 4:OverturningMoment

Overturningmomentislessforframeswithvaryingsizesof Octagridpatternthanshearwall+Octagridbuilding.6and 9mOctagridbuildingsarehavingleastoverturningmoment 33389.95kN.mand33121.56kN.mrespectively.Asmodule sizeincreasesOverturningmomentdecreases.

International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

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FORCE AND MOMENT

Internalcolumnscarriesmaximumloadandaresubjectedto lowermomentthanthatofexternalcolumns Chart - 5:Force Chart 6:Moment

5. CONCLUSION

Eachmodelhassatisfiedthelimitsfordisplacement andstoreydriftasperIS1893part1:2002  Octagridwith6mand9m moduleshowsless top storeydrift,baseshearandoverturningmoment.  The structural performance of Octagrid system decreaseswithincreaseinmoduledensity. 

Buildingswith6mand9mOctagrid,canbeconsider asanefficientalternative.

ACKNOWLEDGEMENT

I am deeply indebted to my guide Prof. H. S. Jadhav, Department of Civil Engineering for guiding me for successfulaccomplishmentofthisresearchwork.Itwasmy privilege and pleasure to work under his guidance. I am indeedverygratefultohimforprovidinghelpfulsuggestions

from time to time. I am also thankful to technical and nontechnicalstaffofCivilEngineeringDepartmentfortheir guidance.

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BIOGRAPHIES

ManishaS.Kumbhar, B.TechStudent, DepartmentofCivilEngineering, RajarambapuInstituteof Technology,Rajaramnagar, Maharashtra,India.

Prof.H.S.Jadhav, Professor, DepartmentofCivilEngineering, RajarambapuInstituteof Technology,Rajaramnagar, Maharashtra,India.