“Analysis of Multi Storied Diagrid Structure using ETABS Software”

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

Volume: 09 Issue: 05 | May 2022 www.irjet.net p-ISSN: 2395-0072

“Analysis of Multi Storied Diagrid Structure using ETABS Software”

Rohit Sunil Navale Department of Civil Engineering

SND College of Engineering & Research Center Babhulgaon Tal.yeola Dist.Nashik

Prof. Nikam Pravin Ankushrao Department of Civil Engineering

SND College of Engineering & Research Center Babhulgaon Tal.yeola Dist.Nashik

Dr Mate N.U. Department of Civil Engineering

Amrutvahini College of Engineering, Sangamner, Dist.Ahehmadnagar ***

Abstract Theincreasingrequirementtoachievelargerheightshasfueledthegrowthofstructuralsystemconceptsfor tallbuildings.Structuralengineershavebeenabletodesignandconstructbuildingsthathavegrownhigherandhigherfor overa century.Manynewideashavearisenasa resultofthisprocess,includingtherelativelynewandground breaking high rise diagrid structural system. The diagrid structure was born from the development of this notion to a system without vertical columns. For tall buildings, digrid structural systems are developing as structurally efficient and architecturally remarkable assemblies. Diagrid structures are effective in terms of both strength and stiffness in giving solutions.A tall skyscraper with a G+16 storey structure is investigated and compared under various circumstances. We explore three modules in our project: structures without diagonal grids, structures with diagonal grids at selected bay's outerface,andstructureswithdiagonalgridsatselectedbay'sinnerface.Storeydriftsanddisplacementwillbecompared, aswellasaxialforcesandbendingmoments,andshearforcesinthecolumn.

Keywords: Displacement,StoryDrift,BendingMoment,AxialForces,ShearForces,

INTRODUCTION: Thediagridisatypeofdiagonalmemberthatisusedinbothgravityandlateralloadresisting systems.Bracedtubestructureshaveevolvedintodiagridsystems.Engineerscannowusecutting edgestructuralsystems toconstructstructuresthataremorethan100storiestall.Researchersbeganusingthetermdiagrid,whichisamixof diagonalandgrid,in1970.Diagridisasteel frameconstructionmethodthatresultsintriangularstructureswithdiagonal supportbeams.Asidefromeliminatingperimetercolumns,thediagriddesignhasotheradvantages.Verticalloadcarrying capabilityisoftenprovidedbycolumns,withdiagonalsorbracesprovidingstabilityandresistancetolargeforceslikeas windandseismicstresses.Thediagrid'sdiagonalmembercarriesbothshearandmoment.Asaresult,thebestanglefor placingdiagonalsisdeterminedbytheheightofthebuilding.

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

Volume: 09 Issue: 05 | May 2022 www.irjet.net p-ISSN: 2395-0072

LITERATURE REVIEW:

• "Diagrid: An innovative, sustainable, and efficient structural system," by Esmaeel Asadi and Hojjat Adeli, published in 2016.

This study discusses several diagrid configurations, as well as the primary aspects that influence their behaviour and designparameters.Thediagridapplicationsforfreeformsteelandconcretestructuresarepresented,demonstratingthe diagrid's applicabilityinstructural designforcomplicatedbuildings.Italsocovers diagridconnections, nonlineardiagrid behaviour,anddiagridstructuralcontrol.Thearticlesuggeststhatdiagridhasthepotentialtobecomeamoreextensively employedstructuralsysteminmidtohighrisebuildingsduetoitsexceptionallateralstiffnessandaestheticqualities.The adjustability of diagrid density and diagonal angle, as well as the flexibility of triangulated diagrid parts to produce complexforms,aretheessentialstructuralpropertiesofdiagrids.

• "Improving the seismic performance of diagrid buildings with buckling constrained braces," Saman Sadeghi and Fayaz R. Rofooei, 2019.

The seismic performance of diagrids with buckling limited bracing is investigated in this study (BRBs). The seismic performance factors of six three dimensional diagrid structures with varied heights and diagonal angles that were modelled using the Open sees programme are evaluated using nonlinear static analysis. The findings show that utilising BRBs enhances the seismic performance of the models investigated by collecting plastic damages in the BRBs and spreadingplastichingesmoreuniformlyacrossthemodels.

• "Seismic fragility evaluation of a diagrid structure based on energy approach," Majid Moradi and Moein Abdolmohammadi (2020).

The goal of this research is to use energy approach principles to analyse the seismic behaviour of diagrid structural systems under near field and far field earthquakes in order to acquire a better understanding of their seismic behaviour and the benefits of adopting energy approaches. The Incremental Dynamic Analysis (IDA) method and a finite element model are used to investigate the behaviour of a 50 story skyscraper. The results reveal that the structure is more vulnerable in far field earthquakes than in near field earthquakes, using both the maximum story drift and energy approaches.

METHODOLODY

Thefollowingisthemethodsusedtoattaintheaforementionedgoals: i) Conductaliteraturereview ii) InETABSoftware,chooseabuildingmodelforthestudy. iii)Createadiagonalcolumnmodelofthechosenstructure(diagridbracing).

Model1:Plainhexagonalstructurewithnobracing.

Model2:Astructurefeaturingdiagonalbracing(diagrids)ontheground,first,andsecondfloors.

Model3:Astructurehavingdiagonalbracingonthe13th,14th,and15thfloors.

Model4:Astructurefeaturingcrossbracingonthe7thand8thfloors.

iv) AcomparisonassessmentofthedataproducedfromtheanalysisinETABSoftwareandaseismicanalysisofthe selected buildingmodel.

v) Discussionsandobservationsofoutcomes

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

Volume: 09 Issue: 05 | May 2022 www.irjet.net p-ISSN: 2395-0072

Theloadpatternappliedonthestructuresisasfollows:

Define Load Pattern Type of Load Load DeadLoad(DL) Dead LiveLoad(LL) Live 2kN/m FloorFurnishLoad SuperDead 1.5kN/m WallLoad SuperDead 10kN/m EarthquakeLoadinx dir (EQX) Seismic SeismicZoneFactorZ 0.16 ImportanceFactorI 1.2 EarthquakeLoadiny dir (EQY) Seismic SeismicZoneFactorZ 0.16 ImportanceFactorI 1.2

Table2.LoadSpecifications

BasicLoadCombinationsasper[IS456:2000,Table18,pg.no.68].

1. 1.5(DL+LL) 14.1.2(DL+LL+EQX)

2. 1.2(DL+LL+WLX) 15.1.2(DL+LL+EQ X)

3. 1.2(DL+LL+WL X) 16.1.2(DL+LL+EQY)

4. 1.2(DL+LL+WLY) 17.1.2(DL+LL+EQ Y)

5. 1.2(DL+LL+WL Y) 18.1.5(DL+EQX)

6. 1.5(DL+WLX) 19.1.5(DL+EQ X)

7. 1.5(DL+WL X) 20.1.5(DL+EQY)

8. 1.5(DL+WLY) 21.1.5(DL+EQY Y)

9. 1.5(DL+WLY Y) 22.0.9DL+1.5EQX 10. 0.9DL+1.5WLX 23.0.9DL+1.5EQ X 11. 0.9DL+1.5WL X 24.0.9DL+1.5EQY

12. 0.9DL+1.5WLY 25.0.9DL+1.5EQ Y 13. 0.9DL+1.5WL Y

14. Various load combinations as per [IS 1893 part 1:2016, 6.3.2.2, pg. no. 8] have been implemented on the structure. Theyareasfollows:

15. 1.2DL+1.2LL+1.2EQX+0.36EQY

16. 1.2DL+1.2LL 1.2EQX 0.36EQY

17. 1.2DL+1.2LL+1.2EQY+0.36EQX

18. 1.2DL+1.2LL 1.2EQY 0.36EQX

19. 1.5DL+1.5EQX+0.45EQY

20. 1.5DL 1.5EQX 0.45EQY

21. 1.5DL+1.5EQY+0.45EQX

22. 1.5DL 1.5EQY 0.45EQX

23. 0.9DL+1.5EQX+0.45EQY

24. 0.9DL 1.5EQX 0.45EQY

25. 0.9DL+1.5EQY+0.45EQX 12 0.9DL 1.5EQY 0.45EQX

Model 2: Building with diagonal bracing(diagrids) at Ground floor, 1st floor and 2nd floor.

Item Storey Size Grade of Concrete

Diagrid Ongroundfloor,1st and 2nd floor 230X230mm M30

Table3.DiagridSpecifications

Model 3: Building with diagonal bracing at 13th storey, 14th floor and 15th floor.

Item Floor Size Grade of Concrete

Diagrid On13th,14th and 15th floor 230X230mm M30

Table3.DiagridSpecifications

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

Model 4: Building with cross bracing at 7th floor and 8th floor.

Item Storey Size Grade of Concrete Diagrid

On7th and8th floor 230X230mm M30

Table3.DiagridSpecifications

Conclusion and Discussion:

Model 1: Plain hexagonal structure with no bracing.

A hexagonal building with G+16 stories and no diagrid is considered. The greatest drift found after the analysis was 0.001321. Under the operation of the design base of shear, storey drift in any storey shall not exceed 0.004 times the storey height [IS 1893 part1:2016]. As a result, the structure is not safe since it shows more deflection than is required, namely0.0012.

Model 2: A structure featuring diagonal bracing (diagrids) on the ground, first, and second floors.

A 16 story hexagonal building with diagrids on the ground, first, and second floors is considered. The largest drift found aftertheanalysiswas0.001248.Asaresult,thestructureissafebecauseithasthesamedeflectionastherequired0.0012.

Model 3: A structure having diagonal bracing on the 13th, 14th, and 15th floors.

A16 storyhexagonalskyscraperfeaturingdiagridsonthe13th,14th,and15thfloorsisbeingconsidered.Thelargestdrift foundaftertheanalysiswas0.001069.Asaresult,thestructureissafebecauseithaslessdeflectionthanrequired,namely 0.0012.

Model 4: A structure featuring cross bracing on the 7th and 8th floors.

A16 storyhexagonalstructurefeaturingdiagridsonthe7thand8thfloorsisbeingstudied.The greatestdriftfoundafter theanalysiswas0.00099.Asaresult,thestructureissafebecauseithaslessdeflectionthanrequired,namely0.0012.

Graph1.Maximumdriftofthefourmodels.

Graph2.Maximumdisplacementofthefourmodels.

CONCLUSION

1. AccordingtoIS1893part 12016,thelateraldisplacementofhexagonalbuildingsisgreaterthanenvisaged.

2. It was discovered that the maximum drift was correct to the required drift according to IS code after installing diagonalbracings(Diagrid)attheground1stand2ndfloors.

3. After installing diagonal bracings (Diagrid) on the 13th, 14th, and 15th floors, it was discovered that the maximum

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

driftwaslessthantheIScode mandateddrift.

4. Afterinstallingdiagonalbracings(Diagrid)onthe7thand8thfloors,itwasdiscoveredthatthemaximumdriftwasfar lessthantheIScoderequireddrift.

5. As a result, the building's drift when diagrids are installed at the bottom storeys is greater than the building's drift whendiagridsarepositionedatthetopstoreys.Also,whenthediagridsareputinthestructure'smiddlestories,the driftisreducedtoaminimum.

6. Whencomparingthefourmodelsofeachcolumn,thereisnosuchvarianceinaxialforceandshearforce.

7. Thebendingmomentsofthemodelsdifferslightly.

REFERENCES

1.EsmaeelAsadiandHojjatAdeli,Wiley,Dec2016,"Diagrid:Aninnovative,sustainable,andefficientstructure system."

2. Saman Sadeghi, Fayaz R. Rofooei, “Improving the seismic performance of diagrid structures using buckling restrained braces.”,JournalofConstructionalSteelResearch166,2019.

3."Seismic fragility assessment of a diagrid structure using the energy technique," Majid Moradi and Moein Abdolmohammadi,JournalofConstructionalSteelResearch174,2020.

4. Vahid Mohsenian, Saman Padashpour, Iman Hajirasouliha, “Seismic reliability analysis and estimation of multilevel responsemodificationfactorforsteeldiagridstructuralsystems.”,JournalofBuildingEngineering,2019.

5. G.B. Ramesh Kumar and Neha Tirkey, "Analysis on the diagrid structure with the Conventional building frame using ETABS," Materials Today: Proceedings, Elsevier, 2019."Analyzing alternative configurations of variable angle diagrid structures." by Kamil Ashraf Bhat and Peerzada Danish, Elsevier, Materials Today: Proceedings,2020

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