ANALYSIS AND DESIGN OF MULTISTORY BUILDING WITH DIFFERENT SLAB ARRANGEMENTS USING ETABS

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

ANALYSIS AND DESIGN OF MULTISTORY BUILDING WITH DIFFERENT SLAB ARRANGEMENTS USING ETABS

Maulin Patel1, Abbas Jamani2

1MTech student L.J University, Ahmedabad, India.

2Abbas Jamani, Assistant Professor, civil engineering department, L.J University, Ahmedabad, India. ***

Abstract - In the prevailing era, earthquakes play a maximum probably position internal factor the evaluation and designing of systems. Therefore, it is far crucial to research the seismic conduct of buildings. In modern day creation, RC systems are normally used for creation. Here evaluation and layout of a Conventional Slab, Flat Slab and Waffle Slab is carried out using ETABS. The assessment is the technique of identifying the behavior of the form beneath heath unique load combinations. Design is the process, which requires the ideal specification of the form. Using software program application utility evaluation and layout device is carried out easily.

This paper analyzes of multistory building with wonderful slab arrangements the use of etabs like as conventional slab, flat slab and waffle slab. We have modelled a 10 storey building in ETAB software program application. Total 12 Models have been prepared with wonderful shape of slabs in wonderful earthquake zone. The object of the prevailing artwork is to study the behavior of building in several seismic zones to study the Story Displacement, Story drift, and Shear force, for building thru the use of ETABS. Most premier prolonged span slab based completely on this study is Building with Waffle Slab.

Key Words: Slab Arrangement, Symmetric Asymmetric, Plain and Sloping Ground Seismic analysis, ETAB.

1. INTRODUCTION

Duetotheshortageofspace,verticalcreationhasadvanced incityareas,whichincludelow rise,medium rise,andhigh risehomes.Thesesortsofhomesmakeuseofbodysystems, which include conventional RC body systems or flat slab bodysystems.Atraditionalslabisusedforthedevelopment thataccomplishesamachineinwhichabeamhelpstheslab and the beam is supported via way of means of a column. This can be referred to as the Beam Slab Load Transfer method;awaythisisnotunusualplaceexerciseeverywhere intheworld.Thedifferentshapeofbodyshapeisreferredto as a "flat slab," in which the slab immediately rests at the column.Thisislikewisereferredtoasabeamwithoutaslab, astheremightbenobeamsonthisbodyshape.

1.1 SLAB ARRANGEMENT

1.Flatslab

TheflatslabisanR.C.Cconcreteslabsupporteddirectlyvia wayofmeansofconcretecolumnsorcaps.Aflatslabdoes nownolongerhavebeamssoitisalsoreferredtoasabeam muchlessslab.Theyaresupportedoncolumnsthemselves. Loadsarewithoutdelaytransferredtocolumns.

TherearefouruniquekindsofconcreteFlatSlabs:

[1] Slabwithoutdropandcolumnwithoutcolumnhead.

[2] Slabwithdropandcolumnwithoutcolumnhead.

[3] Slabwithoutdropandcolumnwithcolumnhead.

[4] Slabwithdropandcolumnwithcolumnhead.

Fig 1:FlatSlab

2.ConventionalSlab

TheslabthatissupportedonBeamsandcolumnsiscalleda conventionalslab.Thethicknessoftheslabissmallwhereas the depth of the beam is large and load is transferred to beamsandthentocolumns.Itrequiresmoreformworkwhen comparedwiththeflatslab.

ConventionalSlabisclassifiedintotwotypes:

[1] One WaySlab

[2] Two WaySlab

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

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5. TostudytheStoryDisplacement,Storydrift,Shear force,bendingmoment,BuildingTorsionforbuilding byusingETABS.

6. Review of different slab results compare with differentslabarrangementsinagraphsandtables.

3. Literature Review

Fig -2:ConventionalSlab

3.WaffleSlab

Waffleslabisareinforcedconcreterooforfloorcontaining squaregridswithdeepsidesanditiscalledasgridslabs.This kindofslabismajorlyusedattheentranceofhotels,Malls, Restaurantsforgoodpictorialview.Itisusuallyusedwhere large spans are required (e.g. auditorium, cinema halls) to avoidmanycolumnsinterferingwithspace.

CH. Lokesh Nishanth, Y. Sai Swaroop, Durga Chaitanya Kumar Jagarapu, Pavan Kumar Jogi [1] The foremost functions of this paintings is to evaluation and layout a industrialconstructingwithspecificslabpreparations,i.e., Conventionalslab,Flatslabwithdroppanels,Grid/Waffle slab,andconstructingwithloadbearingwall.Anindustrial constructingisonewhereinattheleast50percentageofits groundareaisusedforindustrialactivities.Theimpactof seismic and wind forces on homes with specific slab preparationswereanalyzed withtheaidofusingutilizing ETABSsoftwareprogram.ETABSisanengineeringsoftware programproduct,that'sappliedforevaluationandlayoutof structures.Analysisandlayoutareachievedasinkeeping withIS456 2000codebook.M30gradeofconcreteandFe 500 metallic is followed. Load combos are taken as in keeping with IS 875 element five (2015) codebook. Live hundreds are taken as in keeping with IS 875 element 1. Windvelocityoffifty fivem/sandearthquakearea five is followedforevaluation.Loadcombosof1.2(DL+LL+EQ) and1.five(DL+LL+WL)areconsidered.

After their research and analysis work, they conclude an overview on Storey displacement is maximum for ConventionalslabandminimumforLoadbearingwalltype & increases with increase in storey height. Storey displacementforconventionalslabis92.6%morethanthe load bearingwallStoreydriftismaximumforconventional slabandminimumforLoadbearingwalltype.Itismaximum atfourthstoreyofbuilding.BaseshearisminimumforFlat slab and maximum for Load bearing wall type in both the loadcombinations.BaseshearforLoadbearingwalltypeis 44.5%morethantheflatslabtype.

2. OBJECTIVE

1. Themainobjectiveofstudyistheanalyzeanddesign ofabuildingwithdifferentslabarrangementslikeas , i.e., Conventional slab, Flat slab with drop panels andGrid/Waffleslab.

2. Tocalculatethemodelsforgravityloadsandlateral loads Seismic and Wind with different load combinationsasperIndianstandards.

3. Tocalculatethedesignlateralforcesforbuildingby usingETABS.

4. Tostudythebehaviorofbuildinginvariousseismic zones.

Latha M.S, Pratibha K [2]Gridslabincludesribsspacedat everyday c program language period in perpendicular directions,whichmightbemonolithicwithslab.Thesegrid slabsareusuallyusedforarchitecturalmotiveformassive spans consisting of public meeting halls, display rooms, auditoriums, had been to keep away from inner columns with inside the shape. The rectangular voided sample is utilized in gift observe. In the existing, observe 12 tales shapeofsymmetricandunevenforeveryday,planabnormal and vertical abnormal shape for each traditional slab and gridslabisconsidered.Conventionalandgridslabshapeas inkeepingwithIScode1893:2002(Part1).Inaddition, in comparison the consequences of traditional slab and grid slabforparametersofdeflection,storeyshear,displacement andstoreystiffness.

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After their research and analysis work, they conclude Deflection of slab of regular structure is maximum in conventional.Inaddition,inirregularstructuresgridslabis havingmaximumdeflection.Storydisplacementismaximum ingridslabsystemandleastinconventionalslabforboth regular & irregular structure. Story shear is maximum in conventional slabsystemandleastingridslabsystemfor both regular & irregular structure. Finally concluded that, gridslabisbetterthanconventionalslabbecausegridslabis moreeconomicthanconventionalslab.

P. Manjunath and Yogeendra R. Holebsgilu [3]

Thehomesarefoundinslopingfloorareveryspecificfrom theonesinsimplefloor,inslopingfloorthehomesarevery abnormal and unsymmetrical in horizontal and vertical planes.Thehomesinslopingfloorreasonsgreaterharmat somepointofearthquake,duetothefactinslopingfloorthe shapeisbuiltwithspecificcolumnheights.Inthisobserve three D analytical version of 10 storied constructing, the planofeveryconfigurationconsistsoffourbaysinYroute and six bays in X route that is saved identical for all configurationsofconstructingframe,theslopeselectedin amongzeroto30degrees.Theconstructingispositionedon seismic quarter V, with specific soil type; the fashions are analyzed and designed with the aid of using ETABS 2015 software.Seismicevaluationexecutedwiththeaidofusing lineardynamicevaluation(RSA).

After their research and analysis work, they conclude the slopeofthebaseincreases;itresultsindecreaseinseismic weight. Base shear will be very less in sloping ground comparedtothatonlevelground.Storeydriftismoreinon theplaingroundcomparedtothatontheslopinggroundthis isduetoincreaseinfixityandreducesinnumberofstories. Effect of soil is more important on the earthquake performanceofstructure.Thestudyalsopossessesthatin static linear method and response spectrum analysis the performance of the building on sloping ground has more dangertoearthquakethanthatofbuildingpresentinplain ground.

Shivnarayan Malviya and Mr. Vipin Kumar Tiwari [4]

Recentearthquakeswhereinmanyconcretesystemswere significantlybrokenorcollapsed,Haveindicatedthewant for comparing the seismic adequacy of current homes. In order to Strengthen and face up to the homes for destiny earthquakes,afewtechniquesneedtobeadopted.Theuse ofvariousformofslabsisevolvingasabrandnewfashion andisturningintoahugeventureforStructuralengineers. Therefore, it's far essential to examine approximately its structural conduct. This paper offers with the conduct of various form of slabs consisting of flat slab, waffle slab, ribbed Slab and slab with secondary beam. We have modelledaG+5&G+9storeyconstructinginETABSoftware havingaplinthvicinityof1600m2.Thereactionspectrum evaluationhasbeencompletedfortheseismic,areaIII.Ithas

been determined that for big span slabs the shape having secondary beamsneedto beprevented for higherseismic performance.

After their research and analysis work, they conclude Buildinghavingsecondarybeamsstructureshowshighest valueofmaximumstoreydisplacement.Thelowestvalueof storey Building having waffle slab with respect to others casesofmodels.

Navyashree K, Sahana T.S [5] Theshortageofareaincity regions has caused the improvement of vertical growth including low upward thrust, medium upward thrust and tall homes. Generally, framed systems are used for those homes. They are subjected to each vertical and lateral hundreds.Lateralhundredsbecauseofwindandearthquake governs the layout in place of the vertical hundreds. The homesdesignedforverticalloadwon'thavethecapabilityto faceuptothelateralhundreds.Pureinflexiblebodydevice or body movement acquired via way of means of the interplayofslabs,beamandcolumnisn'tadequate.Thebody bymyselffailstoofferthedesiredlateralstiffnessforhomes tallerthan15to20(50mto60m)stories.

After theirresearchandanalysiswork,theyconcludeThe momentismaximumatplinth,firstandsecondlevel.After secondlevel.Baseshearofflatplatebuildingislessthanthe conventionalR.C.Cbuilding.Thedifferencebetweenthetwo variesfrom8 13percentage.Theearthquakeforcesaremore predominantthanothersload.

4. RESEARCH GAP

Literaturesurveyiscarriedouttogetmoreinformationfor themethodsofanalysisforstructure.

Fromtheliteraturereview,wecanconcludethat

The analysis and design a building with different slab arrangements will be more accurate results get and comparisonwithConventionalslab,FlatslabandWaffleslab willbemorespecified.

Which slab arrangement required less amount of steel quantitywithsameloads.

The structure can be compared with post tensioned slab designedmethods.

Slabsconstructionsystemisoneinwhichthebeams used inthestudyislimitedtoresponsespectrumanalysis.

Useofrecycledmaterialsinconcretetoformdifferentslabs andanalysisonthesoftware.

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

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5. METHODOLOGY:

1. Comparewithdifferentslabarrangementslikeas, i.e.,Conventionalslab,Flatslabwithdroppanelsand Waffleslab.

2. Tocalculatethemodelsforgravityloadsandlateral loads(Seismic)differentloadcombinationsasper Indianstandards.

3. Tocalculatethedesignlateralforcesforbuildingby usingETABS.

4. Tostudythebehaviorofbuildinginvariousseismic zones.

5. TostudytheStoryDisplacement,Storydrift,Shear force,forbuildingbyusingETABS.

6. Review of different slab results compare with differentslabarrangementsinagraphsandtables.

6. DETAILS OF THE MODELS

In the present study, one building configurations are considered, which include buildings situated on plain ground.Planlayoutofeachconfigurationincludesfour baysacrosstheXdirectionandsixbaysareconsidered along Y direction, which is kept same for all configurationsofbuildingframewithConventionalslab, FlatslabwithdroppanelsandWaffleslab.

Table 1: GeneralData

DESCRIPTION DATA

Dimensionofplan : 18x25m

NumberofStories : 10

FloorHeight : 3

GradeofConcrete(Beam) : M25

GradeofConcrete(Column) : M25

GradeofConcrete(Slab) : M20

Grade of Steel (Beam & Column) : Fe500

GradeofSteel(Slab) : Fe500,Fe415

Importancefactors,I : 1.5

Responsereductionfactor : 5

Liveloadonfloors : 2

Floorfinish : 1.5

Table 2: Case1 ModalData

Building having Two Way Slab

Beamdimension 300mmx600mm

Columndimension 600mmx600mm Slabthickness 125mm Droppanelthickness Nil

Fig 4:PlanViewofOnewaySlab

Table -3: Case2 ModalData

Building having One Way Slab

Beamdimension 300mmx600mm Columndimension 600mmx600mm Slabthickness 125mm Droppanelthickness Nil

Fig 5: PlanViewofTwowaySlab

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Table 4: Case3 ModalData

Building having Flat Slab with Drop Panels

Beamdimension Nil

Columndimension 600mmx600mm

Slabthickness 200mm Droppanelthickness 400mm

Fig 6: PlanViewofFlatSlab

Table 5: Case4 ModalData

Building having Waffle Slab

Beamdimension Nil

Columndimension 600mmx600mm Slabthickness 75mm Droppanelthickness 450mm

7. Result:-

Theresultsareseismic,storydisplacement;storeydriftand concretequantityarecomparedforallthefourcasesofthe building.Moreover,loadcombinationforallcasesconsidered as1.2(DL+LL+EQx/EQz).

Table -6: MaximumStoryDisplacementofVariousSlab

Building having Flat Slab with Drop Panels

Story One Way Slab Two Way Slab Waffle Slab Flat slab

Story10 53.92 53.875 55.407 65.682

Story9 51.908 51.889 53.344 63.157

Story8 48.707 48.7 50.043 59.216

Story7 44.403 44.398 45.613 53.93

Story6 39.201 39.197 40.281 47.532 Story5 33.316 33.313 34.27 40.279

Story4 26.944 26.942 27.778 32.407

Story3 20.257 20.255 20.978 24.14

Story2 13.421 13.418 14.026 15.715

Story1 6.679 6.667 7.103 7.536 Base 0 0 0 0

Chart 1:GraphofMaximumStoryDisplacementof variousslab

Fig 7: PlanViewofWaffleSlab

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Table 7: MaximumStoryDriftinVariousSlab

Building having Flat Slab with Drop Panels

Story One Way Slab Two Way Slab Waffle Slab Flat slab

Story10 0.000679 0.000662 0.000688 0.000852

Story9 0.001068 0.001063 0.0011 0.001315

Story8 0.001435 0.001434 0.001477 0.001763

Story7 0.001734 0.001734 0.001777 0.002133

Story6 0.001962 0.001961 0.002004 0.002418

Story5 0.002124 0.002124 0.002164 0.002624

Story4 0.002229 0.002229 0.002267 0.002756

Story3 0.00228 0.002279 0.002317 0.002808

Story2 0.002258 0.00225 0.002308 0.002727

Story1 0.00167 0.001667 0.001776 0.001884

Base 0 0 0 0

Chart -4:PercentageofMaximumStoryDriftofVarious Slab

Table 8: TotalQuantityofConcretefordifferentslab

Types Of Slab

ONEWAY 1187 TWOWAY 1187 FLATSLAB 1588 WAFFLESLAB 1384

Chart 2:GraphofMaximumStoryDriftofvariousslab

Chart 5:GraphofTotalQuantityofConcreteindifferent slab

8. CONCLUSIONS

The following conclusions are obtained from the analysis andResults.

• Flat slab having greater story displacement and story drift while in comparison with the different slab.

Chart -3:PercentageofMaximumStoryDisplacementof VariousSlab

• Flatslabconstructions,ontheotherhand,increase the aesthetic perspective while allowing the

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

architectenormousflexibilityofformwork,easeof placementofflexuralreinforcement,easeofcasting concrete,openspaceforwater,andpipes,andthe reduction of building height in multi story structuresbysavingonestoryheight.Thismakes theFlatslabmoreeconomicalascomparedtothe conventional.

• WhereastheConventionalslabismoresuitablefor Residentialandsmallspanstructures.

• Waffle Slab is more suitable for bigger span structureslikebigmalls,halls,andauditoriumsfor thebetterelegantviewofbuilding.

• Forthesamespan/gridsize,theamountofconcrete requiredforaWaffleslabmulti storeybuildingis minimumandforaflatslabmulti storybuildingis maximum.

• Asperresults,wheneverincreasingzonetypestory displacementandstorydriftincreasing.Sothat,the studyalsopossesthatincreasingearthquakezone hasmoredangertobuildingforcollapse.

• StoreydisplacementforFlatslabis20%morethan conventionalslab.

• Storey drift for Flat slab is 23% more than conventionalslab.

REFERENCES

[1] CH.LokeshNishanth,Y.SaiSwaroop,DurgaChaitanya KumarJagarapu,PavanKumarJogi“Analysisanddesign ofcommercialbuildingwithdifferentslabarrangements usingetabs”MaterialsToday:Proceedings

[2] Latha M.S, Pratibha K “Analysis and comparison of conventional slab and grid slab for symmetric and asymmetricstructures”MaterialsToday:Proceedings

[3] P. Manjunath and Yogeendra R. Holebsgilu “Seismic analysisofmultistoreybuildingwithflatslabrestingon plainandslopingground”BonfringInternationalJournal of Man Machine Interface, Vol. 4, Special Issue, July 2016.

[4] Shivnarayan Malviya and Mr. Vipin Kumar Tiwari “Comparative study of seismic behaviour of multi storeybuildingswithflatslab,waffleslab,ribbedslab &slabwithsecondarybeam”JournalofXi'anUniversity ofArchitecture&Technology.

[5] Navyashree K, Sahana T.S “Use of flat slabs in multistorey commercial building situated in high seismiczone”ScienceDirect ELSEVIER.

[6] J.D. Chaitanya kumar, Lute Venkat, Analysis of multi storey building with precast load bearing walls, InternationalJournalofCivilandStructuralEngineering, Volume4,No2,2013.

[7] E.PavanKumar,A.Naresh,EarthquakeAnalysisofMulti StoriedResidentialBuilding ACaseStudy,Vol.4,Issue 11,IJERA 2014,pages59 64.pages87 96.

[8] TejashreeKulkarni,SachinKulkarni,Analysisanddesign ofhigh risebuildingframeusingstaadpro,Volume:05, Issue:04,IJRET 2016,pages235 237.

[9] S. Ramamrutham Design of Reinforced concrete structure

[10] Dr.V.L. Shah, Late Dr. S.r. kurve Limit state theory & DesignofReinforcedconcrete

[11] IS 456 2000 Code of Practice is an Indian Standard codeofpracticeforgeneralstructuraluseofplainand reinforcedconcrete.

[12] IS 456 2000 Code of Practice is an Indian Standard codeofpracticeforgeneralstructuraluseofplainand reinforcedconcrete.

[13] IS 1893:2002 Indian code for earthquake resistant structures.

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