Seismic Analysis of G+10 building with and without Rubber Bearing using E- TABS by IRJET Journal

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

Volume: 12 Issue: 05 | May 2025 www.irjet.net p-ISSN:2395-0072

Seismic Analysis of G+10 building with and without Rubber Bearing using E- TABS

S D1 , Pallavi K2 , Prajwal R Chavan3, Radhika Nagaraj Dange 4 , Sagar A Patil 5

1 Asst Professor, Department of Civil Engineering, Dr. AIT, Bengaluru 2,3,4,5 UG Students, Department of Civil Engineering, Dr. AIT, Bengaluru

Abstract - Bracings, shear walls, dampers,baseisolationetc are the earthquake resistant techniques adopted to the building to safeguard it from the hazourdous effects of earthquake. The main purpose of this project is to analyze the G+10 residential building with and without Rubber bearing. Two models of the building were created one with rubber bearing and other with fixed support subjected to Dead load, live load and Earthquake load in combination as per IS 875 (part 1&2) and IS 1893-part1. The building considered to be located in zone V. Both the models were analysed and are compared on the basis of storey displacement, storey shear, storey drift, and base shear and are illustrated in the form of chart. The results show that storey displacement, storey shear, storey drift, and base shear values were much less in case of model with rubber bearing when compared with model with fixed support.

Key Words: Earthquake resistant techniques, Rubber bearing,baseisolation,earthquakeload,seismicload

1. INTRODUCTION

Earthquakes are the most destructive of natural hazards. Earthquake occurs due to sudden transient motion of the ground as a result of release of energy in a matter of few seconds.Theimpactoftheeventismosttraumaticbecauseit affectslargearea,occursallofasuddenandunpredictable.

Vibrations induced in the earth’s crust due to internal or externalcausesthatvirtuallyshakeupapartofthecrustand allthestructuresandlivingandnon-livingthingsexistingon ittheycancauselargescalelossoflife,propertyanddisrupts essentialservicessuchaswatersupply,seweragesystems, communication,powerandtransportetc.

Software usedareAutoCADSoftwareandETABSSoftware. ETABS software used in the project stands for Extended Three-DimensionalAnalysisofBuildingSystems.

AsperIS1893-part1,Indiaisdividedintofivezonesbasedof sevearityinoccuranceofearthquake.

Zone II: A low seismic hazard zone with Zone factor (Z) = 0.10.

ZoneIII:AmoderateseismichazardzonewithZonefactor(Z) =0.16.

ZoneIV:AhighseismichazardzonewithZonefactor(Z)= 0.24.

ZoneV:AveryhighseismichazardzonewithZonefactor(Z) =0.36.

In Base isolation techniques, superstructure is separated fromfoundationusingflexibleinterfacessuchaselastomeric bearings, lead rubber bearings, Sliding systems etc. which allowsthebuidingtomoveindependentlyduringearthquake thusreducingforcetransmittedfromgroundtothebuilding duringearthquake.

2. METHODOLOGY

2.1 Flow chart

2.2 Building specifications

Inthisworkfollowingbuildingdetailsareconsidered No.ofstories=10

Height=37 eachbay@3m

SitePlandimensions-100’X50’-8.4”

Location=Bengaluru

ConcretegradeM25

SteelgradeHYSD500

Sneha

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

Volume: 12 Issue: 05 | May 2025 www.irjet.net p-ISSN:2395-0072

2.3 Plan and column layout

ImportingarchitectureplanfromAutoCADandgeneratethe grids; after getting opened with ETABS we select a new model,andawindowappearswherewehadenteredthegrid dimensionsandstorydimensionsofourbuilding.

:GridgeneratedinEtabs

2.4 Specifying Member Property

Thememberpropertiesaretakenasgiven Thicknessofslab=125mm

Beam=300x200mmColumn=300X750mm

Thememberpropertiesarefirstdefinedandthenassignedto therespectivemembersinEtabssoftware.

Fig-2: Assigning the Beam and Column properties

2.5 Defining of rubber bearing properties

Fig-3: DefiningtheRubberBearingproperty

2.6 Assigning of Supports

FortheG+10storey3Dmodelcreated,Fixedsupportswere assignedtoonemodelandrubberbearingswereassignedto anothermodelinsteadoffixedsupport

Fig-4: AssigningtheFixedSupport

Fig-5: AssigningtheRubberBearing

2.7 Defining and Assigning of loads

Deadload,liveloadandearthquakeloadsweredefinedand assignedtoboththemodels,loadcalculationsareasshown below

Deadload

Basedonthebeamandcolumndimensonsassigneddeadload isautomaticallycalculatedbyetabssoftwareitself

Floorfinishload

Weightofmortarbed=1.02KN/m²

Weightofgranite =0.475KN/m²

ThereforeFloorfinish=1.5KN/m²

Liveload

AsperIS875(Part2)-1987forresidentialbuildingliveload intensityisconsideredas2kN/m2

Wallloads

MainWallloads–11.45KN/m

PartitionWallloads-6.25KN/m

Parapetwallloadonterracebeam-3.12KN/m

Fig-1

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

Volume: 12 Issue: 05 | May 2025 www.irjet.net p-ISSN:2395-0072

Earthquakeload Earthquake load was defined and assigned in both X and Y directions consideringfollowingparametersasperIS1893-part1

Zone:V

SeismicFactor:0.36

SoilType:II(safesoil)

ImportanceFactor:1

Responsereduction factor:5

Fig-6: DefiningtheEarthquakeloadinXdirection

Fig-7: DefiningtheEarthquakeloadinYdirection

2.8 Load combination

Dead load, live load and earthquake load were applied in combination on model with fixed support and also model withrubberbearingconsideringscalefactorof1.2.

Fig-8: DefiningtheloadcombinationinXdirection

Fig-9: DefiningtheloadcombinationinYdirection

2.9 Analysing the models

Models are checked for errors and analysed. After the completionofanalysis,resultsofstoreyshear,storeydrift, storeydisplacementandbaseshearinboththemodelswere compared.

3. RESULTS AND DISCUSSION

Thecomparisionofresultsobtainedarerepresentedbelow bothintableformatandgraphs.Itcanbeobservedthatthe Storey drifts, Storey shear, storey displacement and base shear values for model with rubber bearing is much less whencomparedtomodelwithfixedsupportwhensubjected tocombinedloading.

3.1 Storey Drift

Table-1: StoreyDriftalongX-DirectionforFixedBaseModel andRubberBearingbaseModel.

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

Volume: 12 Issue: 05 | May 2025 www.irjet.net p-ISSN:2395-0072

Chart-1: StoreyDriftalongX-DirectionforFixedBaseModel andRubberBearingbaseModel

Table-2: StoreyDriftalongY-DirectionforFixedBaseModel andRubberBearingbaseModel

Chart-2: StoreyDriftalongY-DirectionforFixedBaseModel andRubberBearingbaseModel

3.2 Storey shear

Table-3: StoreyshearalongX-DirectionforFixedBase ModelandRubberBearingbaseModel

Chart-3: StoreyshearalongX-DirectionforFixedBase ModelandRubberBearingbaseModel

Table-4: StoreyshearalongY-DirectionforFixedBase ModelandRubberBearingbaseModel

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

Volume: 12 Issue: 05 | May 2025 www.irjet.net p-ISSN:2395-0072

Chart-4: StoreyshearalongY-DirectionforFixedBase ModelandRubberBearingbaseModel

3.3 Storey Displacement

Table-5: StoreyDisplacementalongX-DirectionforFixed BaseModelandRubberBearingbaseModel

Chart-5: StoreyDisplacementalongX-DirectionforFixed BaseModelandRubberBearingbaseModel

Table-6: StoreyDisplacementalongY-DirectionforFixed BaseModelandRubberBearingbaseModel

Chart-6: StoreyDisplacementalongY-DirectionforFixed BaseModelandRubberBearingbaseModel

3.4 Base shear

Table-7: BaseshearalongX-DirectionforFixedBaseModel andRubberBearingbaseModel

Chart-7: BaseshearalongX-DirectionforFixedBaseModel andRubberBearingbaseModel

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

Volume: 12 Issue: 05 | May 2025 www.irjet.net p-ISSN:2395-0072

Chart-8: BaseshearalongY-DirectionforFixedBaseModel andRubberBearingbaseModel

4. CONCLUSION

Themaximumpercentagedecreaseinthestoreydriftalong EQXandEQYdirectionis87.79%and77.34%

Themaximumpercentagedecreaseinthestoreyshearalong EQXandEQYdirectionis79.16%and79.54%

The maximum percentage decrease in the storey displacement along EQX and EQY direction is 78.07% and 93.67%

Themaximumpercentagedecreaseinthebaseshearalong EQXandEQYdirectionis79.16%and77.24%

Thestoreydisplacement,storeydrift,storeyshearandbase shear values of model with rubber bearing is lower when comparedtomodel withoutrubberbearing,indicatingthe improvedLateralStability

Based on the results,itis recommended toinclude rubber bearing in the design of multi-storey buildings in highseismiczonestoreduceseismicvulnerabilitiesandensure adherencetosafetystandards

The rubber bearing improve the distribution of seismic forces,reducingstressconcentrationsoncolumnsandbeams, thusminimizingtheriskofstructuralfailures.

REFERENCES

Dr.Alokkumarjain,Dr.ManishSakhlecha,SumanVerma,et al, “Seismic retrofitting by base isolation and analysing throughE-TABS”InternationaljournalofTrendinResearch andDevelopment(IJTRD)Volume:7(5)|Sep-Oct2020

CenkAlhan,etal.“Modelingofleadrubberbearingsvia3dbasis,sap2000,andopenseesconsidering leadcoreheating modelingcapabilities”InternationalJournalofStructuraland Civil Engineering Research (IJSCER) Volume 7, No 4 | November2018

Mr Ankurvaidya1,Mr ShahayajaliSayyedetal “AResearch onComparingtheSeismicEffectonShearwallbuildingand Without-ShearWallBuilding”InternationalResearchJournal ofEngineeringandTechnology(IRJET)Volume:05Issue:12| December2018

SanketVijayMunot,PBAutade,etal “DesignofLeadRubber Bearing Base Isolator system for high Rise structure” InternationalJournalofCreativeResearchthoughts(IJCRT) Volume:9,Issue:7|July2021.

P B Autade, Rohit Kokane, et al. “Comparitive study on conventionalbuildingwithleadrubberbearingandDamper systems”InternationalJournalofCreativeResearchthoughts (IJCRT)Volume7|July2021

IS:875(Part1),fordeadloads,BureauofIndianStandards, NewDelhi,India

IS: 875 (Part 2), for imposed loads, Bureau of Indian Standards,NewDelhi,India

IS1893(Part1),forseismiczone,BureauofIndianStandards, NewDelhi,India.

RadmilaBSALIC,MihailA.Garevski,ZoranV.Milutinovic,et al “Response of Lead Rubber Bearing Isolated Structure” WorldConferenceEarthquakeEngineering(WCEE)Oct1217,2008,Beijing,China

BIOGRAPHIES

SnehaSD

Assistantprofessor,departmentof Civil Engineering Dr. AIT Bengaluru

PallaviK

UG Student, department of Civil EngineeringDr.AITBengaluru

PrajwalRChavan

UG Student, department of Civil EngineeringDr AITBengaluru

RadhikaNagarajDange

UG Student, department of Civil EngineeringDr.AITBengaluru

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

Volume: 12 Issue: 05 | May 2025 www.irjet.net p-ISSN:2395-0072

SagarApatil

UG Student, department of Civil EngineeringDr.AITBengaluru