BEHAVIOUR OF G+10 BUILDING WITH SHEAR-WALLS AT DIFFERENT POSITIONS

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BEHAVIOUR OF G+10 BUILDING WITH SHEAR-WALLS AT DIFFERENT POSITIONS

1Assistant Professor, Dept. of Civil Engineering, School of Engineering and Technology, Sandip University, Nashik, Maharashtra, India.

2M. Tech., Student, Dept. of Civil Engineering, School of Engineering and Technology, Sandip University, Nashik, Maharashtra, India. ***

Abstract Nowadays shear wall as structural element in high rise buildings has become a common practice. It has become the most common way to form the Lateral load resisting system in High rise structures. Veryhighstrengthand stiffness of the shear walls can be used to resist large horizontal loads and supporting Gravity loads. This makes them advantageous in many structuralapplications. Themain focus of this project is to determine the most suitable location or position for the shear wall. A G+10 RCC building subjected to earthquake loading located in zone IV is considered in this project. The equivalent Lateral force method or static method is used to calculate the Earthquake load using IS1893 (Part I):2002. Analyses were performed on ETABS. This research focuses on determining strength of shear walls in different locations. We have tried to place shear walls at different locations and an attempt has been made to check the best position for shear walls in a building. Six different cases of shear wall position for a G+10 building have been analyzed. This project aims to analyze the response of structure using by static method.

1. INTRODUCTION

Earthquake in general has long devastating history in the past. Earthquakes are most distressing and a threat to humancivilization,devastating man made structures, and human lives. It is such an unpredictable calamity that survivalmustensurethestrengthofthestructuresagainst seismic forces(13). Therefore, a lot of research works are going on around the globe for the development of better techniques that can be incorporated into structures for betterresistanceagainstearthquakes(13).Ashearwallisa structural component located in a building right from foundation level to top parapet level at various locations. Shear walls are used to defend against lateral forces. Structuralmemberswhichareusedtoresistlateralforces duetoearthquakesandwindaretheShearwalls.

Therearemanydifferentmethodsofseismicanalysislikethe time history method, response spectrum method seismic coefficientmethod,etc.(13) Astudyhasbeencarriedoutto determinethebestpossibleorientationoftheRCshearwall of a multistoried building by trying out different possible

orientations. And parameters like storey drift, base shear, nodaldisplacementareobservedandcompared

Thesixdifferenttypesofmodelsareasfollows(Fig:4 9)

1. WithoutaShearwall

2. ShearwallattheCentre ForLiftcoresonly

3. ShearwallsatPeriphery

4. ShearwallsatCorners

5. Shear wall along both Longitudinal faces & Lift cores

6. ShearwallalongwithbothLateralfaces&Liftcores

1.1 Concept

In this project, different position of shear wall is given.Shearwallgivesmorestabilitytothebuilding’sthan normalwall.ThisbuildingislocatedinDelhi,zoneIV.This projectgiveideaaboutshearwalllocation.Thisisalsoshow thatthebehaviorofshearwallinthebuildingsatdifferent location. This project gives idea about displacement, drift, shear.

The location of the shear walls depends on the plan of structure,corelocation,thesymmetryofthebuilding,andthe lateralforceexperiencedbythestructure.Mostly,shearwalls shouldbeplacedaroundtheouterwallsofthebuildingina symmetricalform. Itisusuallyverydifficulttofindasuitable locationfortheshearwallinthestructure.However,theideal place is the center of the building. Sometimes, structural analysis is performed to identify the ideal location in the structure.

1.3 Properties of shear wall

Shear wall is a structural member positioned at different places in a building from foundation level to top parapet level,usedtoresistlateralforcesi.eparalleltotheplaneof thewall.Therearedifferentmaterialsbywhichshearwall canbeconstructed,butreinforcedconcrete(RC)buildings often have vertical plate like Reinforced concrete walls (Figure 1) in addition to slabs, beams and columns. Their thicknesscanbeaslowas150mm,orashighas400mmin

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

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highrisebuildings.Shearwallsareusuallyprovidedalong bothlengthandwidthofbuildings.

1.2 Flow chart

Fig -1:FlowChart

1.4 Functions of Shear Walls

Shearwallsmustprovidethenecessarylateralstrengthto resist horizontal earthquake forces. When shear walls are strongenough,theywilltransferthesehorizontalforcesto the next element in the load path below them (13). These othercomponentsintheloadpathmaybeothershearwalls, floors,foundationwalls,slabsorfootings.

2 MODELING AND ANALYSIS

2.1 Building Description

ThemodelingandanalysisisdoneusingETABSsoftware. ThebuildingconsideredfortheanalysisisaResidentialG+10 building. The typical floor plan and elevation of the residentialbuildingisasshowninthefigure2andfigure3.

Fig 2:Typicalfloorplan

Fig 3:Elevationofthebuildin

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

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2.2 Design Criteria

BUILDING DESCRIPTION

NumberofStories G+10

1

The building was idealized into a structural frame and modeledinETABSbygeneratingthegrids.Thesixdifferent modelsweremodeledandanalyzedseparately.Thesemodels areasfollows:

Table 3:Buildingdescription

MATERIALSPECIFICATIONS

ElasticModulusofM30concrete 27386.12MPa ElasticModulusofM40concrete 31622.77MPa PoissonsRatioofConcrete 0.2 ElasticModulusofSteel 200000MPa

Table 4:Materialspecification

TYPEOFLOADING

CODE

DeadLoad IS875(Part1):1987 LiveLoad IS875(Part2):1987 WindLoad IS875(Part3):1987 SeismicLoad IS1893(Part1):2016

Table 5:ISCodesused

DESCRIPTION VALUE

ZoneFactor IV 0.1 SoilType Medium II ImportanceFactor I 1 ResponseReductionFactor R 3

Table 6:Seismicparameters

DESCRIPTION VALUE

LocationofBuilding Delhi Purpose ResidentialOccupancy Sub Structure In SituRaftFoundation Super Structure OrdinaryMoment ResistingFrames FloorSlabType Two Wayslabsystem LateralLoad resistingsystem RigidFloorDiaphragmand OMRFwithShearWalls No. Load Combination 1. 2. 3. 4. 5. 6. 7. 8. 9.

BasicWindSpeed 44m/s DesignlifeofStructure(50years) 1 Topographyfactor 1 TerrainCategory 2 ImportanceFactor 1 PressureCoefficientPositive 1.2 PressureCoefficientNegative 0.001

Table 7:Windloadparameters

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4. RESULTS

All the six models were analyzed, and the results were generated from ETABS. Before running the analysis, the modelhasbeencheckedforanywarnings.

Storey displacements plotted when Earthquake hits in X direction.Significantstoreydisplacementsareobserved.

Fig 4:Modelcase1

Fig 5:Modelcase2

Fig -9:Modelcase6

Model 1 having No shear walls tend to show very large displacements. Very small displacements are observed in Model5(Shearwallsatcorners). Model2&4areshowing almostsamestoreydisplacementsinYdirection.Similarly, Model3&6.Thisshowsthatthecontributionoftheshear wallalongX directionisveryless.

Themaxstoreydisplacementisobservedtobesignificantly reduced when compared with the building without shear wall.Morethan50%reductionindisplacementswasnoticed justbyprovidingshearwallsattheliftcores.Maximumof about90%reductionindisplacement wasobservedwhen theshearwallswerelocatedatthecornersofthebuilding. Differentorientationsofshearwallhavebeenstudiedand therespectivereductionwasnotedandcanbeseeninthe bargraph.Althoughwehavegot90%reductionwithoneof theorientations,weneedtocheckwhetheritisoptimum/ economical or not? To know that I have calculated the efficiency of every model considered. The efficiency was calculatedbyMaxstoreydisplacementdividedbythelength ofshearwallprovided.Calculationsshowthatthemaximum efficiencyisshownbythrmodelwiththeshearwallsatthe Liftcoresonly

Fig 6:Modelcase3

Fig 7:Modelcase4

Fig 10:Storeydisplacementinx direction

Fig 8:Modelcase5

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Model 1 give more displacement as compared to other Model,becausethemodeldoesn’thaveshearwalls.Model5 give very less displacement, because shear walls are providedatthecorners.Thisconfigurationisrestrainingthe displacementinalldirectionsmakingthestructureverystiff. The displacements are reduced by almost 50% just by providingshearwallsattheliftcores.

Whereas providing shear walls along longer side of the structureisobservedtobenotveryefficient.Thereasonis quietobviousthattheMomentofInertiaandsothestiffness of the structure is already higher along longer side, providingshearwallsalongthisdirectionmaybeofnouse andonlyincreasingthecostofthestructure.

Infigure13,reductionofstoreydisplacementwithrespect toModel1isgiven.Model5hasshownthemaximumabout 90%reductionwhenshearwallisprovidedatthecorners. Reductionindisplacementmaybeafascinatingnumberbut agoodstructuraldesigncanbeidentifiedbytheefficiencyof the structural components we are providing. And hence plotting the efficiency of each and every configuration consideredisveryimportant.

Fig 11:Storeydisplacementiny direction

Fig 13:Reductioninstoreydisplacementw.r.t.first model

Fig 12:Maximumstoreydisplacement

Fig 14:Efficiencyinresistingstoreydisplacement

4. CONCLUSIONS

Shear wall is become an important structural component when it comes to High rise buildings. Provision of shear walls in high rise structures significantly reduce the displacementsandsuppresstheeffectofseismicforcestoo. But, just providing the shear walls is not enough. The location where shear walls have to be provided and the configurationisofimportance.Asastructuralengineer,we shouldalwaystrytomakethedesignssuchthatweareusing lowest possible quantity of concrete and steel in the structure. Not only that but utilizing their strengths and capacitiestothefullest.

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

1. Displacementsofthestructurecanbereducedby around 50% just by providing shear wall at the centerofthebuilding.

2. Providingshearwallsatthecornercanbethebest optionwhenitisnotpossibletoprovideshearwalls atthecenter.

3. Shearwallshallbeprovidedalongtheshorteredge ofthestructure.

4. Providing shear walls along longer side of the structuremaynotbeusefulasstructurealreadyhas higherstiffnessalonglongerdirection.

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