Numerical evaluation of diagrid system with other grid system using ANSYS software

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

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

Numerical evaluation of diagrid system with other grid system using ANSYS software

1Mtech student, Structural and construction management, MGMCET, Pampakuda P.O, Muvattupuzha, Kerala, India

2Assistant professor, Civil Department, MGMCET, Pampakuda P.O, Muvattupuzha, Kerala, India

3Assistant professor, Civil Department, MGMCET, Pampakuda P.O, Muvattupuzha, Kerala, India ***

Abstract Diagrid structures are designed with new geometric layouts. The flexibility and aesthetic appearance make it unique. In this paper comparing four grid systems such as O Grid, Elliptical grid, concentric grid and Forward grid with ANSYS workbench 2021 R2. Also the connection bracings are provided with three shapes such as H, I and C. Analysis with an outrigger with O Grid H, I, C shape is also performed. Analysis is mainly used to determine the seismic performance of models, energy absorption capacity and ductility of the models. After analysis the result obtained that, by comparing with other models O Grid models are between the forward and elliptical bracing systems, and have appropriate load bearing and can absorbedgreatenergywith their axial and flexural behaviour. The utility performance of OG rid with C section shows better result.

Key Words: Diagrid Grid, O Grid, Elliptical bracing system, Grid bracing system, forward bracing seismic response.

1. INTRODUCTION

1.1 General Background

Diagridconstructionshaveframesarrangedinatriangular modular quadrilateral. These triangular members resist verticalandlateralloads.Becausetherearenoelementsor columns. A modular framework consists of larger interlockingsteels.Thissystemhasordoesnothavevertical components, and since the primary load components are members,theyalsohavelateralsupport.Tiesarecommonly usedtostabilizeabuildingstructureagainstlateralloading. Themainfunctionofthestrutsistostabilizethestructure and prevent its collapse. Various fastening systems are currently in use. Depending on the shape, the braces are diagonalbracings,X shaped,K shaped shaped,ellipticaland O shaped. In this paper different bracing systems are numericallyanalysed.

2. NUMERICAL INVESTIGATION USING ANSYS WORKBENCH 2021 R2

Numerical modelling of different gridsystemslike OGrid, Elliptical grid, concentric grid and Forward grid with differentsectionalgeometriesweredoneusingANSYS2021 R2WORKBENCH,afiniteelementsoftwareformathematical

modelling and analysis. The dimension of frame is 3000x3000mm. Utility performance of different O Grid outrigger with H, I, C sections is also performed. The dimensionsandpropertiesofallthebeamsandcolumnsof all the specimens are same. The size of different section geometries are shown in Table 1. The different section propertyareselectedfromIBCcodeandthegeometriesare showedinTable2.

Table -1: DifferentBraceSectionGeometries.

NAME OF MODEL COLUMN SECTION BEAM SECTION BRACE SECTION

OGrid IPB160 IPE180 IPE120

Elliptical grid IPB160 IPE180 IPE120

Angulargrid IPB160 IPE180 IPE120

Forwardgrid IPB160 IPE180 IPE120

Table 3 shows the material property of different bracing system.Figure1showsatypicalexampleofanOGridwith anI sectiongeometry,Figure2showsatypicalexampleof an elliptical with a C section geometry, Figure 3 shows a typicalexampleofaconcentricgridwithH sectiongeometry andFigure4showsthetypicalexampleofforwardI section geometry.

Table 2: SectionProperty.

Section property

IPB160 IPE180 IPE120

Depth 160 180 120

Widthof flange 160mm 91mm 64mm

Thicknessof flange 13mm 8mm 6.3mm

Thicknessof web 8mm 5.3mm 4.4mm

International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072

Table -3: MaterialProperty.

Fig -4:ForwardgridwithI section

2.1 Utility performance of O Grid in an outrigger system

Anoutriggerisconstructedwith threestoreywithOGrid. OutriggerwithH,IandCsectionsweremodelled.Theheight ofeachlayeris3000mmanddiameterofOGridis2616mm. Thelengthofbeamis9000mm.forfirststoreythereisthree OGridsareprovided.Onthewholestructuretotallyof9O Grids are there. Figure 5 shows the modelled view of outriggerwithCsectiongeometry.

Fig -5:ModelledviewofsteelwithoutriggerwithC section

2.2 Loading and boundary conditions

Herea100mmdisplacementisgiveninx direction.Similar loading conditions is given to twelve models. Also the support condition is fixed. A remote displacement is also provided. Figure 6 and 7 shows the loading pattern in Angular Isectionandinanoutriggergeometry.

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

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

Combination of O Grid Section

Fig -6 LoadingandboundaryconditionofAngulargrid

Fig 7 LoadingandboundaryconditionofOGridin outriggersystem

3. RESULTS AND DISCUSSIONS

Theload displacementhysteresiscurvesofeachmodelare drawn by comparing the load deformation values of each model Chart1tochart4showstheobtainedvalues.

200000

100000

0

-100000

300000 -150 -100 -50 0 50 100 150 Force (N)

-200000

-300000

Deformation (mm)

O Grid-C O Grid-I O Grid-H

Comparison of Elliptical Sections

200000

100000

0

-100000

300000 -150 -100 -50 0 50 100 150 Force (N)

-200000

Chart 1:Load displacementhysteresiscurveofOGrid section -300000

Deformation (mm)

Elliptical-C Elliptical- I Elliptical -H

Chart -2:Load displacementhysteresiscurveofelliptical gridsection

Comparison of Angular sections

100000

50000

0

150000 -200 -100 0 100 200 Force (N)

-50000

-100000

-150000

Deformation (mm)

Angle-C Angle-I Angle-H

Chart 3:Load displacementhysteresiscurveofangular gridsection

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

Chart 6showstheenergyabsorptioncapacityofeachmodel.

5.00E+05

0.00E+00

1.00E+06 -150 -100 -50 0 50 100 150 Force (N)

-5.00E+05

-1.00E+06

Deformation (mm)

Comparision of Forward sections Forward-C Forward-I Forward -H

Chart 4:Load displacementhysteresiscurveofforward gridsection

Theacceptanceofdifferentgeometriesofoutriggerwillbe analyzedusingANSYSsoftware.Table4showstheresultsof anoutriggersystems.

Table -4: Resultsofoutriggersystem

Name of model Total deformation (mm) Equivalent stress (MPa)

Outrigger I 112.03 653.34 Outrigger H 112.74 648.37 Outrigger C 112.44 751.27

1000000

Energy absorbed

500000

0

Ogrid-C Ogrid-I Ogrid-H Elliptical-C ELliptical-I Elliptical -H Angle-C Angle-I Angle-H Forward-C FOrward-I Forward-H

Name of models

Chart 6: Energyabsorptioncapacityofgridsystems

Force (N)

Force (N)

Chart5showsductilecharacteristicsofgridsystems.From thesemaximumforcevalueisobtained. 0

1000000 0 50 100 150

500000

Deformation (mm)

Ogrid-C O Grid-I Ogrid-H Elliptical -C Elliptical-I Elliptical-H Angle-C Angle-I Angle-H Forward-C Forward-I Forward-H

Chart -5: Ductilepropertiesofgridsections

100000

This can be simplified by comparing the maximum force valueofoutrigger H,outrigger I,outrigger C.Chart7shows themaximumforcevalueofdifferentgeometries. 0

150000 0 50 100 150

50000

Deformation (mm) Outrigger-I Outrigger -C Outrigger -H

Chart -7:Comparisonofoutriggerwithdifferent geometries

4. CONCLUSIONS

This study was mainly used to compare different types of bracing with different cross section geometries. When analysing,Gridbracesarebetweentheforwardandelliptical systems, and they have adequate load bearings and can absorbgreatenergywiththeiraxialandflexuralbehaviour. Unlike other braces, the structure and shape of O Grid braces, can be used in any part of the structure without removingarchitecturalspaceandarchitecturalform.Ogrid bracingsystemhasgoodductilityandstiffness.

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

Theresultofanalyticalstudywithdifferentbracingsection geometryisshowninfollowingconclusions:



The load deflection hysteresis curve of twelve models,OGridwithH,I,C sectionbracing,elliptical gridwithH,I,C sectionbracing,angularbracingH,I,C andforwardbracingwithH,I,C section.

[5] Maryam Boostani, Omid Rezaifar, Majid Gholhaki, “Experimental investigation of a new lateral bracing systemcalledOGridundercyclicloading”,Department of structural Engineering, Semnan University, Iran,2022.



Theresultshowedthatforward Hsectionbracing hasmoreductilityandenergyabsorptioncapacity, also the one with O Grid C section bracing shows comparableresult.

[6] Mahathi Heshmati, Alireza Khatami, Hamzeh Shakib,”Seismic performance assessment of tubular diagrid structures with varying angles in tall steel buildings”, Department of civil and Environmental Engineering,TarbiatModaresuniversity,Iran,2020.



Theresultobtainedfromtheanalysisofoutrigger showsthatOutrigger Csectionshowsthemaximum forceandequivalentstress.

[7] Qingxuan Shi, Yihui Ying, Bin Wang, ”Experimental investigationonthe seismic performanceofconcrete filledsteeltubularjointsindiagridstructures”,College ofcivilengineering,Xi’anUniversityofArchitecture& technology,Xi’an710055,China,2020



ThusthisOGrid Ctypeofbracingcanbeeffectively used in engineering structures in seismic prone areas which have the ability to withstand lateral loads.

ACKNOWLEDGEMENT

IwishtothanktheManagement,PrincipalandHeadofCivil EngineeringDepartmentofMGMCollegeofEngineeringand Technology,affiliatedbyKeralaTechnologicalUniversityfor theirsupport.Thispaperisbasedontheworkcarriedoutby me (Ancy Eldho), as part of my PG course, under the guidance of Anila. C. Shaju and Inus Paulose (Assistant Professors, MGM College of Engineering and Technology, Muvattupuzha,Kerala).Iexpressmygratitudetowardsthem forvaluableguidance.

REFERENCES

[1] Arshia Keivan, Yunfeng Zhang, “Nonlinear seismic performance of Y type self centering steel eccentri callybracedframebuildings”,DepartmentofCiviland Environmental Engineering, University of Maryland, CollegePark,USA.2018

[2] F.Albouye,“ExperimentalInvestigationofNewStruc turalSystem‘‘OGRID’’,DepartmentofCivilEngineering, SemnanUniversity,Iran,2016

[3] G.Lacidogna,D.Scaramozzino,A.Carpinteri,“Influence ofthegeometricalshapeonthestructuralbehaviourof diagridtallbuildingunderlateralandtorqueactions”, DepartmentofstructuralEngineering,CorsoDucaDegli Abruzzi24,Torino,Itely,2020.

[4] JorgeRuiz Garcíaa,EdénBojorquezb,EdgarCoronab. “Seismicbehaviourofsteeleccentricallybracedframes undersoft soilseismicsequences”,SoilDynamicsand EarthquakeEngineering115(2018)

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal