Comparative Seismic Analysis of G+20 RC Framed Structure Building for Maximum Drift with and without

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

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

Comparative Seismic Analysis of G+20 RC Framed Structure Building for Maximum Drift

with and without Shear Wall

1Rohit Maheshwari1

1Assistant Professor, Department of Civil Engineering, School of Engineering and Technology, DIT University, Dehradun, Uttarakhand, India ***

ABSTRACT

High risedesigngoalsincludestability,easeofmaintenance,durability,andaccommodationoftherequirementsinminimum space. Providing enough strength and stability against lateral stresses should be done precisely Optimal sizing which is of primeimportancefortheeconomyaccountsforoptimalstiffnessco relationshipsamongstructuralparts.High risestructural system is prone to the effects due to lateral loads, axial forces, shear forces, base shear, maximum story drift, and tensile forces In this paper, a comparative study is performed for G+20 Reinforced Concrete (RC) tie column and tie beam framed structures withand without the provisionofshear walls The analysisisperformed in the softwaretool E Tabs.Theapplied loadsandloadcombinationsarecalculatedandconsideredasperIndianCodal Provisions.Thestructure is consideredtobe locatedinseismiczoneIV. Theresultsofmaximumdriftvalues reveal thatthemaximumdrift decreaseswhena structureis configuredproperlywithashearwall.

Keywords: Shear Walls; RC Frame; Structural Response; Seismic Behavior; Maximum Drift

1 INTRODUCTION:

A building is subjected to a variety of forces, including lateral stresses induced by earthquakes, wind, and blasting Lateral loadscangenerateincreasedstrains,sidewaysmovement,andevenvibrations.Furthermore,theplananddesignofabuilding shouldbesturdyenoughtosustainverticalloads.Broadlyastructuralsystemcomprisesthefollowingconstituents:

1) System of Structural Frames: The structural system is a combination of frames, floor slabs, columns, and beams. These frameshavesufficientstiffnessandcanresistgravityloads.

2) Structural Wall Systems: Structuralwallsalsoknownasshearwallscontainallverticalmembersinthistypeofstructural system.

3) Shear Wall and Frame Systems: In the Shear Wall Frame system, reinforced concrete shear walls interact with concrete framestoformaplan.Abuildingwill faceminornon structuraldamageifitissufficientlystiff. Figure1depictsthefloor layoutofabuildingconfiguredwithashearwall framestructure.

Figure1:ShearWallFloorPlan

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Figure2:TypicalShearWallSections

Modeling the structural system is an important step while analyzing lateral loads in building structures. Many models are developedsolelytodemonstratethebehaviorofashearwallstructure.Withthisaim,manyresearchershaveconductedtheir studies on wall frame structures and stated the shear walls to be more complicated than typical frame structures. Figure 2 showsthetypicalshearwallsections.

2 Past Literature Review

Inmulti storybuildings,theadaptionofshearwallshasbeenmandatorytoattainhigherresistanceagainstlateralloads. The importanceofdeterminingthemosteffective,efficientandoptimumsizeforshearwallscannotbeoversighted[1] Structures in high seismic zones may sustain significant damages. The most prevalent solutions for resisting lateral loads generated by earthquakes, wind, blasts, and other natural calamities are R.C. structures with ductile detailing and steel structures with bracings. E TABS is used in computer aided analysis to determine the most effective lateral load resisting system [2]. The seismic performance of a building frame can be improved by a well designed system of shear walls. The study takes into account various configurations of RC moment resistant framed building structures. According to the findings, symmetrically placedshearwallarrangementsthatformacorewillresultinimprovedstructuralperformance[3] IntheIndianconstruction scenario,high risespreadingprojectshavegrownextremelypopular.ManymajorIndiancitiesarelocatedinhigh riskseismic zones,necessitatingthereinforcementofbuildingstowithstandlateralstresses[4].PriyankaSonietal.performedstructural analysesonmultiplestorystructuresatvariouslocationsandheightsoftheshearwalls.Themulti storybuildingwasmodeled and analyzed while taking into account all gravitational and lateral loads (Wind Load and Earthquake Load) [5] They have Analyzed and designed a reinforced concrete rectangular shear wall to withstand the effects of an earthquake. Amar, et.al. usedSTAAD ProdesignsoftwaretodepicttheShearForceandLateralForceoperatingontheOfficeBuilding(G+5)inSeismic ZoneIV[6]

Tall buildings must be designed with strength, serviceability, stability, and human comfort in mind. The investigation is restrictedtomulti storyreinforcedconcretecommercialstructuresinfourseismiczones[7] Whenastructureisshakenbyan earthquake. The structure shakes in all three directions as a result of this motion [8] Due to dominant lateral loads, tall structures experience unusual loading effects and extremely high loading values. The stiffness co relation of structural elementsistakenintoaccountwhilesizing.Asa result,comparedtostandarddesignoptions,thereisacostsavings [9].Itis necessarytodeterminetheseismicreactionsofsuchstructurestodevelopearthquake resistantstructures.Amoresignificant methodology for structural seismic analysis is time history analysis. A dynamic analysis of a G+12 multistory practiced RCC building is performed, taking into account the earthquakes in Koyna and Bhuj [10]. Hence, the concept of structural engineeringaswellasthebasicunderstandingoftheoreticalandpracticalknowledgeofplanninganddesigningarerequired fortheanalysisanddesignofrobustanddurablemulti storybuildings[11].

3 MODELLING & ANALYSING BUILDING STRUCTURES:

The two most important components in a structure’s analysis and design are selecting an acceptable structural modeling method that depicts the system's actual behavior and deciding on the analyzing technique to be used for the structure. As

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

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

statedintheobjectiveofthestudy,twotypesofbuildingsareconsidered,i.e.,withandwithouttheprovisionofashearwallas shown in figure4. The modeling is performed in ETABS Software and demonstrates the 3 D view of the G+20 story RC plan buildingmodel.usingthefollowingtwobasicconcepts:

Figure 3: 3 DViewofG+20RCFrameBuildingwithshearwalls

1) Analyses of the Maximum Story Drift: Inter storey drift is described as the ratio of lateral displacement of one floor of a multi story building concerning the floor just above or below and the height of a building. The drift is found to be maximuminthetopstoryofanybuildingstructure.Maximumdriftisdefinedastheratioofroofdisplacement(maximum displacement)tothetotalheightofabuilding.Table1depictstheadopteddatatomodelthebuildingstructure.

Table 1: StructuralDataofthedesignedmodel

Type of structure RC Framed G+ 20 Stories

Zone IV

ZoneFactor 0.24

ImportanceFactor 1 ResponseReductionFactor 5

Eachfloorheight 3meters

Thicknessofwall 200mm Thicknessofslab 200mm

WeightofFloorfinish 1.1kn/m2

Columnsize 750mmX750mm Beamsize 450mmX250mm

2) Model Design: Building model design contains designing the column, beam and slab elements; whose specifications are specified in Table 1. Two structural systems are considered to compare the behavior of a structure under the effect of lateral loads: structural systems without a shear wall (model 1) and structural systems with a shear wall (model 2) as elaborated in Figure 4. The results obtained through analyzing these structural systems are acquired in the form of maximumstorydrift

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

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a) Model1 b)Model2

Figure 4:BuildingModel1withoutShearWall&Model2configuredwithShearWall

Note: The dimensions of beam, column, and slab elements for (Model 1 and Model 2) are considered similar to determine the effect of shear wall provision when the structure is applied with lateral loads. The applied loads and load combinations may vary in these two models according to Indian Codal Provisions.

6 RESULTS

For a G+ 20 RC Framed structure located in Seismic Zone IV, a comparative study is performed adopting response spectrum analysisinSoftwaretool E tabs Multiplelocationsfortheprovisionofshearwallsareconsidered. AspertheIndianSeismic Provisions, a story drift in the structural system with partial safety factor 1 should not exceed 0.004 times the height of a structure. The obtained results of drift presented in Figures 5 8 indicates that the maximum value of drift is within the permissiblelimitofmaximumstorydrift. Figure5 6illustratesthe maximumstory driftinthex directionasdefinedby blue colorandthemaximumstorydriftinthey directionasdefinedbyredcolor.Figure7 8depictsthebuilding'smaximumdrift whenitisconfiguredwithshearwalls.

Figure 5: StoryDriftforLoadCombination1.5(DL+EQX+EQY)(Model 1)

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

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Figure 6: StoryDriftforLoadCombination0.9(DL+EQX+EQY)(Model 1)

Figure 7: StoryDriftforLoadCombination1.5(DL+EQX +EQY)(Model 2)

Figure 8: StoryDriftforLoadCombination0.9(D±EQX±EQY)(Model 2)

6.1.3 Maximum story drift for load combinations:

Figures 9 illustrate the maximum story drift for load combinations in the X direction for models 1 and 2, respectively, and Figure10showsthemaximumstorydriftintheY directionformodels1and2withaloadcombinationof1.5(DL+EQX +EQY) Similarly, Figures 11 illustrates the maximum story drift for load combinations in the X direction for models 1 and 2, respectively,andFigure 12 showsthe maximumstory drift inthe Y directionfor models1and2 witha load combination of 0.9(DL+EQX +EQY) Providing shear wall maximum drift value decrease by 12 15% in the x direction and 8 10% in the y direction

Note: Blue & grey line for M 1, orange and yellow line for M 2 for different load combination scenarios.

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

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S to r y Dr i fy (m m )

0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 0.0014 0.0016

Maximum Story Drift for Load Combination 1 5( DL+EQx ) 0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 0.0014 0.0016

Sto ry 20 Sto ry 18 Sto ry 16 Sto ry 14 Sto ry 12 Sto ry 10 Sto ry 8 Sto ry 6 Sto ry 4 Sto ry 2 Bas e

No. of Stories

S to r y Dr i ft (m m )

Sto ry 20 Sto ry 18 Sto ry 16 Sto ry 14 Sto ry 12 Sto ry 10 Sto ry 8 Sto ry 6 Sto ry 4 Sto ry 2 Bas e

No. of Stories

Figure 9: MaximumStoryDriftforLoadCombination1.5(DL±EQX)Model1&2

Maximum Story Drift for Load Combination 1 5 (DL EQy )

0.002

0.0015

0.001

0.0025 Sto ry 20 Sto ry 18 Sto ry 16 Sto ry 14 Sto ry 12 Sto ry 10 Sto ry 8 Story 6 Story 4 Story 2 Bas e

S to r y Dr i ft No. of Stories

0.0005

0.0025

0.002

0.0015

Maximum Story Drift for Load Combination 1 5 (DL+ EQy ) 0

Maximum Story Drift for Load Combination 1 5 (DL EQx ) 0

0.001

0.0005

S to r y Dr i ft No. of Stories

Sto ry 20 Sto ry 18 Sto ry 16 Sto ry 14 Sto ry 12 Sto ry 10 Story 8 Sto ry 6 Sto ry 4 Sto ry 2 Bas e

Figure 10: MaximumStoryDriftforLoadCombination1.5(DL EQY)Model1&2

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Maximum Story Drift for Load Combination 0 9 ( DL+EQx )

Story Drift (mm)

0 0.0002 0.0004 0.0006 0.0008 0.001

Story20 Story18 Story16 Story14 Story12 Story10 Story8 Story6 Story4 Story2 Base

No. of Stories

Story Drift (mm)

0 0.0002 0.0004 0.0006 0.0008 0.001

Story20 Story18 Story16 Story14 Story12 Story10 Story8 Story6 Story4 Story2 Base

No. of Stories

Figure 11: MaximumStoryDriftforLoadCombination0.9(DL EQX)Model1&2

Maximum Story Drift for Load Combiation 0 9 (DL+EQy ) 0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 0.0014

Maximum Story Drift for Load Combination 0 9 ( DL EQx ) 0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 0.0014

Maximum Story Drift for Load Combination 0 9 (DL EQy )

Story20 Story18 Story16 Story14 Story12 Story10 Story8 Story6 Story4 Story2 Base Stpry Drift (mm)

No. of Stories

Story20 Story18 Story16 Story14 Story12 Story10 Story8 Story6 Story4 Story2 Base Story Drift (mm)

No. of Stories

Figure 12: MaximumStoryDriftforLoadCombination0.9(DL EQY)Model1&2

7 CONCLUSIONS

FollowingsalientobservationsarederivedfromtheanalysisofG+20storyRCframebuildingwithandwithouttheprovision ofshearwalls:

1. The inclusion of a shear wall in an RC Frame Structure minimizes Story Drift, making it safer compared to an RC Frame Structurewithoutashearwall.Shearwallsinamulti storybuildingminimizetheStoryDrift.

2. The appropriate location of shear walls significantly reduces the structure's maximum drift. Summarily provision of properlydesignedshearwallsistheessentialneedforRCFramedstructuresinhigherearthquakezones.

8 REFERENCES

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