COMPARATIVE ANALYSIS OF STEEL BUILDING ON SLOPING GROUND FOR DIFFERENT ANGLE

COMPARATIVE ANALYSIS OF STEEL BUILDING ON SLOPING GROUND FOR DIFFERENT ANGLE

Siddhesh Wavale1 , Trupti Narkhede2 , P J Salunke3

1M. E. Student, Dept. of Structural Engineering, MGM college of engineering and technology kamothe navi-mumbai

2Professor, Dept. of Structural Engineering, MGM college of engineering and technology kamothe navi-mumbai

3Head of the Department, Dept. of Structural Engineering, MGM college of engineering and technology kamothe navi-mumbai

Abstract – The unpredictable natural disasters like earthquakes leads to the importance of seismic studies. In this research paper we study steel structure on sloping ground where structure is step-back. The structure is totally commercial building. The structure is examined for seismic zone III and soil condition is hard consider. The structure is compared the sloping ground and plain ground and also with and with-out bracing system. The total 24 model is done on ETABS 2019 software. The 12 model is analysis on plain ground and sloping ground with-out Bracing system and 12 model is analysis on plain ground and sloping ground withBracing System. The slope is 10-degree, 20-degree and 30degree. The bracing is applying X-Bracingat outerperipherals and Diamond-Bracing at Center of core. The Models are analysis for various aspect like Story Displacement, Natural period of Oscillation, Base Shear, etc. Inthisresearch P-deltais not Consider.

Key Words: Steel Structure, Step back, Sloping Ground, Bracing,RSM, Natural period of Oscillation, Base Shear

1.Introduction

Generally, all buildings are constructed on horizontal plainlevelground.Inthehillyregionhavingslopingground it is hard to build the multistory structures. The constructions of the building now days are progress on slopinggroundduetolackofhorizontalplainlevelground. These hill regions are the most hazardous view shows sometimesduetosomenaturalcalamitieslikelandsidesand seismic activity. The earthquake is the one of the major factors is consider on the sloping and mountainous areas. Thus,duetogrowinglevelofheavypopulationthebiggest reasonofconstructiondoneonmountainousareas.

1.1 Steel Structure

Steel structure is a metal structure which is made of structuralsteelcomponentsconnectwitheachothertocarry loads and provide full rigidity. Structural Steel is steel constructionmaterialwhichfabricatedwithaspecificshape and chemical composition to suit a project’s applicable specifications.CommonshapesincludetheI-beam,Channels,

AnglesandPlate.Inmodernconstruction,steelstructuresare used for almost every type of structure including heavy industrial building, high-rise building, equipment support system,infrastructure,bridge,tower,airportterminal,heavy industrialplant,piperack,etc

1.2 Scope of the Project

 The structure is (G+10), (G+20), and (G+30) floor for commercialusedwherefloortofloorheight3.5m.

 The building rest on sloping in one side ground where slopeis10,20,30andplaingroundundertheseismicand windload.

 Thebuildingframeisstepback.Thestructureshouldbe analysiswithandwithoutBracingsystem.

 The result of this analysis will include base shear, Displacement,naturalperiodofoscillation.

 The conclusion will be finding out and compared with different configuration. At the end, a suitable configuration of building to be used in hilly region is suggested.

1.3 Methodology of Project

 InthisresearchpaperIwillstudytheSteelframeWith andWith-OutBracingSystemInplaingroundandsloping groundindifferentangle.

 ModalofstructureisdoneonCSIETABS

 AnalysisofSteelStructureasperIS800:2007.

 SeismicanalysiscarriedoutbyResponseSpectrum MethodasperIS1893:2016andWindanalysisasper IS875(part3):2015.

 ModalistoberunonCSIETABSsoftware.

 TheresultshouldbeobtainedfromETABS.

 Observedandcomparetheresultlikebaseshear, Naturalperiodofoscillationanddisplacement,etc.

 Conclusion

International Research Journal of Engineering and Technology (IRJET)

2. Model Configuration

There are following model is done on CSI ETABS by ResponseSpectrumMethodandWindanalysis,theseareas below.

1. STEELFrame(G+10)buildingonplainground.

2. STEELFrame(G+20)buildingonplainground.

3. STEELFrame(G+30)buildingonplainground.

4. STEELFrame(G+10)stepbackbuildingonsloping10 degree.

5. STEELFrame(G+20)stepbackbuildingonsloping10 degree.

6. STEELFrame(G+30)stepbackbuildingonsloping10 degree.

7. STEELFrame(G+10)stepbackbuildingonsloping20 degree.

8. STEELFrame(G+20)stepbackbuildingonsloping20 degree.

9. STEELFrame(G+30)stepbackbuildingonsloping20 degree.

10.STEELFrame(G+10)stepbackbuildingonsloping30 degree.

11.STEELFrame(G+20)stepbackbuildingonsloping30 degree.

12.STEELFrame(G+30)stepbackbuildingonsloping30 degree.

13.STEELFramewithBracing(G+10)buildingonplain ground.

14.STEELFramewithBracing(G+20)buildingonplain ground.

15.STEELFramewithBracing(G+30)buildingonplain ground.

16.STEELFramewithBracing(G+10)stepbackbuildingon sloping10degree.

17.STEELFramewithBracing(G+20)stepbackbuildingon sloping10degree.

18.STEELFramewithBracing(G+30)stepbackbuildingon sloping10degree.

19.STEELFramewithBracing(G+10)stepbackbuildingon sloping20degree.

20.STEELFramewithBracing(G+20)stepbackbuildingon sloping20degree.

21.STEELFramewithBracing(G+30)stepback building on sloping 20 degree.

22.STEEL Frame with Bracing (G+10) step back building on sloping 30 degree.

23.STEEL Frame with Bracing (G+20) step back building on sloping 30 degree.

24.STEEL Frame with Bracing (G+30) step back building on sloping 30 degree.

2.1 Input Data for Models

Table-1: PreliminaryData

4

2.2 Plan View of Building

Figure1: PlanViewofBuilding

2.3 Building Elevation View

Figure3:With-outBracingSteelframeon20-degree Groundand30-DegreeSlope

Figure2:With-outBracingSteelframeonPlainGround and10-DegreeSlope

Figure4:WithBracingSteelframeonPlainGround

Figure7:WithBracingSteelframeon30-degreeSlope

3. Result

3.1 Base Shear

ChartNo.1.BaseShearWith-OutBracingSystem Frame(G+10)Structure

ChartNo.2.BaseShearWith-OutBracingSystem Frame(G+20)Structure

Figure5:WithBracingSteelframeon10-degreeSlope

Figure6:WithBracingSteelframeon20-degreeSlope

3.2 Natural Period of Oscillation

ChartNo.7Fundamental

ChartNo.8NaturalPeriodofModeoscillationWith-Out BracingSystemFrame(G+20)Structure

ChartNo.9NaturalPeriodofModeoscillationWith-Out BracingSystem

ChartNo.10NaturalPeriodofModeoscillationWith BracingFrameSystem(G+10)Structure

NaturalPeriodWith-OutBracing SystemFrame(G+10)Structure

Frame(G+30)Structure

ChartNo.3.BaseShearWith-OutBracingSystem Frame(G+30)Structure

ChartNo.4.BaseShearwithBracingFrameSystem(G+10) Structure

ChartNo.5.BaseShearFramewithBracing(G+20) Structure

ChartNo.6.BaseShearFramewithBracing(G+30) Structure

ChartNo.15

ChartNo.16

3.3 Maximum story Displacement for Seismic Load

ChartNo.13SeismicDisplacementWith-OutBracing frameSystem(G+10)Structure

ChartNo.11NaturalPeriodofModeoscillationWith BracingFrameSystem(G+20)Structure

hartNo.12NaturalPeriodofModeoscillationWith BracingFrameSystem(G+30)Structure

ChartNo.14SeismicDisplacementWith-OutBracing frameSystem(G+20)Structure

SeismicDisplacementWith-OutBracing frameSystem(G+30)Structure

SeismicDisplacementWithBracingframe System(G+10)Structure

ChartNo.17SeismicDisplacementWithBracingframe System(G+20)Structure

No.22

Chart No.23 Wind Displacement With Bracing frame System(G+20)Structure

ChartNo.24WindDisplacementWithBracingframe System(G+30)Structure

3.4 Maximum story Displacement for Wind Load

ChartNo.19WindDisplacementWith-OutBracing frameSystem(G+10)Structure

ChartNo.20WindDisplacementWith-OutBracing frameSystem(G+20)Structure

ChartNo.18SeismicDisplacementWithBracingframe System(G+30)Structure

ChartNo.21WindDisplacementWith-OutBracing frameSystem(G+30)Structure

Chart

WindDisplacementWithBracingframe System(G+10)Structure

4. Discussion

1. AsperIS1893,TheMassofparticipationis65%infirst theirmodeandstructureissafefromtorsion.

2. After analysis model, The Natural Period of mode Oscillation is Decrease, when Slope of structure is increased.

3. AllstructuralaresafeinTorsionalIrregularity.

4. . In G+10 and G+20 Bracing system the Base Shear is increased,Whentheslopeisincreased.

5. In G+30 the Base Shear is observed, The Base Shear is DecreasingbecauseoftheSeismicCoefficientislessthan 1.1%.

6. In G+10, G+20 with and with-out bracing structure it is observed that, The Base Shear is increased because of fundamentalnaturaltimeperiodisdecreased.Andalso, the weight of building is decreased when slope is increased

7. . In Natural Period of oscillation get 41% difference in with-out bracing system and with bracing system. If bracing system is applying the Natural Period of oscillationisdecrees41%.

8. Compare plain ground and sloping ground. The Natural Period of Oscillation is decreased. In G+10 with-out Bracingsystemaverage20%decreasedandwithBracing systemaverage12%decreased.WhereinG+20with-out BracingsystemandwithBracingaverage6%decreased. And in G+30 with-out Bracing system average 4% decreased and with Bracing system average 2% decreased.

9. ThewithoutBracingsystemG+10andG+20structureis safeindeflectionbutG+30isnotsafeinwinddeflectionit is cross the limit (H/500). The G+30 structure required Bracingsystem.

10. The wind load is increased when the slope is increased because as per topography factor (K3) is based on topographydimension.Whentheslopeisincreased(K3) factorisalsochange,at10-degreeslopethe4%forceis increased and at 20-degree and 30-degree slope 3.6% forceisincreased.

5. Conclusions

1. After comparison it is observed that G+10 and G+20 structurecanstablewith-outBracing but morethan20 storystructurerequiredBracingSystem.

2. InthiscaseG+30storystructureisbetterperformancein BracingSystem.

3. Comparison between Bracing system and with-out bracingsystem,ifweaddbracingsystemthenstiffnessof structure is increase and Because of increase stiffness, Decreasethemodeofoscillation.

4. Afteranalysisthemodel,theG+30with-outBracing systemstructureisunsafe.

5. Afteranalysisthemodel,observedthatwhentheslopeis increasedneedtoprovidedmorestiffnessforcolumnup toslopingarea.

6. It is observed that when the slope is increased then deflectionofstructureisalsoincreasedinGravity(DLLL).

REFERENCES

[1] Dhiraj Ahiwale et al. – “Seismic Response Assessment of Steel Frame Step-back Building for Different Fluid Viscous Dampers” – https://www.researchgate.net/ publication/344269992,Sep2020

[2] NaveenV&MNHegde–“DynamicAnalysisofsetback steel moment resisting frame on sloping ground with different types of bracing system” – International ResearchJournal of Engineering and Technology, Vol. 04Issue09,June-2017.

[3] Panthak tayade & Dr. Swati Ambadkar – “Analysis and DesignofG+6buildingindifferentSeimicZoneofIndia” –International Journal for Research in Applied Science and Engineering Technology, ISSN 2321-9653 June2020.

[4] Swapnamol Chacko eta al – “Optimization of Seismic ResponsebySteelframestructureonslopingground”–International Research Journal of Engineering and Technology–ISSN2395-0056June2022.

[5] Amruta Kadu – “Seismic Analysis of RCC and Steel buildingonslopingground” – International Journal for Research in Applied Science and Engineering TechnologyISSN2321-9653July2021.

[6] ReferIScode:-IS800:2007

...IS1893:2016 IS16700:2017

...IS875(Part1,Part2andPart3)

[7] ReferBooks:-SteelStructuresbyB.C.PunmiaAshok Jain,ArunJain

DesignofSteelStructuresbySK DuggalStructuralAnalysisbyRC Hibbeler

BIOGRAPHIES

Mr.SiddheshBholanathWavalehas completed his BE from Mumbai University. He is currently pursing hisMEstructuralEngineeringfrom MGM college of Engineering and Technology,kamothe, Panvel. Hehas totalworkexperienceof5yearsand is currently working at CBM engineercompanyinhigh-risemultistoryproject.