Comparative Study of Different Structural System with Steel Staggered Truss System

Transcription

1 Kalpa Publications in Civil Engineering Volue 1, 2017, Pages ICRISET2017. International Conference on Research and Innovations in Science, Engineering &Technology. Selected papers in Civil Engineering Coparative Study of Different Structural Syste Steel Staggered Truss Syste Viral H.Sheth 1,2,3*, Dr.V. R.Panchal 1+ and A. J.Wankawala Civil and structural engineering, CHARUSAT, Changa, India 2 Assistant Professor, CHARUSAT, Changa India 3 Assistant Professor, CHARUSAT, Changa, India viralsheth023@gail.co, Vijaypanchal.cv@charusat.ac.in, ankitwankawala@gail.co Abstract Staggered Truss Syste () is a prospective steel structure for high-rise buildings and staggered truss fraing is one of the effective design techniques to iprove the efficiency of building. In addition, cost reduction arise fro reduction in steel tonnage using this fraing ethod. The purpose of this study is to carryout coparative analysis of oent resisting, oent resisting shear, staggered truss and staggered truss shear. In this analysis, different tie histories are used. For the analysis, these structures are odeled in SAP2000 v18 and various displaceent data are achieved for different types of. After analysis of these four odels, soe outcoes are observed and it is concluded that displaceent in staggered truss reduced by 28% to 76% in transverse direction copared to oent resisting. It is observed that the reduction in displaceent for shear is 7% to 43% in longitudinal direction but in transverse direction, the reduction of displaceent is alost sae as. As per result Staggered truss shear gives 46% to 76% less displaceent in longitudinal direction & 28% to 77% less displaceent in transverse direction for different near fault ground otion. After analyzing all data, it sees that staggered truss shear is ore efficient than oent resisting and oent resisting shear and staggered truss. 1 Introduction Staggered truss was developed by Massachusetts institute of technology in USA. It is a new concept in structural steel fraing for high rise building. In this colun are located only at exterior faces of the building for achieving large colun free area. For large scale building staggered truss is successfully applied. is not considered as a basic seisicforce-resisting so soe research work should be carried out for. In Indian standard there is no any guideline for staggered truss but AISC gave guidelines for staggered C.D. Modhera, G.J. Joshi, D. Soni, I.N. Patel, A.K. Vera, L.B. Zala, S.D. Dhian, D.R. Bhatt, J.M. Rathod, B.C. Goradiya, M.S. Holia and D.K. Patel (eds.), ICRISET2017 (Kalpa Publications in Civil Engineering, vol. 1), pp

2 truss in Design Guide 14 [1]. The should be provided at alternate floor level for achieving large colun free area twice than colun spacing. Staggered truss is generally suitable for rectangular building [1]. Staggered truss ust be provided in shorter direction. For the connectivity between two corridors, one central opening is provided called vierndeel. Previous research work was carried out only for vierndeel truss, angle of incline truss [2], coparison between staggered truss and open web truss [3], coparison between gusset plate welding and direct welding [4]. But the use of steel plate shear in ay be new direction of research work. Table 1Standard properties of steel Sr. No. Property Value 1 Yield strength of Fe 250 N/ A 2 Yield strength of Fe 350 N/ A 3 Density 7850 kg/ 3 4 Young s Modulus N/ 2 5 Poisson Ratio 0.3 Figure. 1staggered truss MATERIAL PROPERTIES Two aterials are used Fe410 A and Fe490 B. For bea, colun and incline truss Fe490 B is used. For shear Fe 410 A is used. 1.1 Proble forulation One G + 7 storey building having plan diension of 60 x 45 is odeled in SAP2000. All coluns are fixed at the base. Staggered truss is provided in shorter (y-direction) direction and in longer direction oent resisting is provided. Strong axis of coluns are oriented parallel to longitudinal direction. Material nonlinearity is considered for analysis in SAP2000. Indian Standard Wide Parallel Flange Bea (WPB) are used as coluns. Aspect ratio for the shear is taken as one. For consideration of large colun free area for, coluns areprovided in transverse direction at interval of 10 and 5 for. 509

3 Table 2 Section properties Sr. Model 1 & Nae No. Model 2 1 Diension Nuber of storey 8 3 Height of each storey 3 4 Colun WPB Bea ISMB 250, ISMB 200 ISMB Type of floor slab Concrete 7 Thickness of floor 0.19 Figure. 2 Plan of building Model 1: Structure oent resisting Figure. 3Model 1:Moent resisting Model 2: Moent resisting 6 thick and 3 wide steel shear at four corner in x- direction Figure. 4Model 2: Moent resisting shear Table 3Section properties Sr. No. Nae Model 3& Model 4 1 Diension 60 x 45 2 Nuber of storey 8 3 Height of each storey 3 510

4 4 Colun Storey 1 to 3 Storey 4 to 5 Storey 6 to 8 5 Bea In transverse direction (y) In longitudinal direction (x) WPB WPB WPB ISWB 250 ISMB200,ISMB175 6 eber ISA Type of floor slab Concrete 8 Thickness of floor 0.19 Model 3: Structure staggered truss Figure. 5Model3:Staggered truss Model 4: Structure staggered truss 6 thick and 3 wide steel shear at four corner in x-direction. 1.2 Loading Schee Figure. 6Staggered truss shear As per IS codal provision floor finishing, Live Load, Roof live load is 1 kn/ 2, 2 kn/ 2 & 1 kn/ 2 respectively. Nonlinear dynaic tie history analysis is carried out to investigate axiu displaceent in x&y direction under different Near-fault ground otions. 1. October 15,1979 Iperial Valley, California (El centro Array #5) (EQ 1) 2. October 15,1979 Iperial Valley, California (El centro Array #6) (EQ 2) 3. January 17,1994 Northridge, California (Newhall) (EQ 3) 4. June 28, 1992 landers, California (Lucerne Valley) (EQ 4) 5. January 17,1994 Northridge, California (Rinaldi) (EQ 5) 6. January 17,1994 Northridge, California (Sylar) (EQ 6) Load cobination is taken as per IS Clause no

5 2 Result Data Table 4Maxiu displaceent in x direction () Nearfault groun d otio n She ar Syst e shear EQ EQ EQ EQ EQ EQ Figure. 7Maxiu displaceent in x direction in () () Table 5Maxiu displaceent in y direction Nearfault ground otion Shear Syst e shear EQ EQ EQ EQ EQ EQ Figure. 8 Maxiu displaceent in y direction in () 512

6 3 Conclusion After analysis of these four odels soe outcoes are observed and it is concluded that displaceent in staggered truss reduced by 28% to 76% copared to oent resisting in y direction. It is observed that the reduction in displaceent in x direction for shear is 7% to 43% but in y direction the reduction of displaceent is alost sae as. As per result Staggered truss shear gives 46% to 76% less displaceent in x direction 28% to 77% less displaceent in y direction for different near fault ground otion. After analysing all data, it sees that staggered truss shear is ore efficient than oent resisting and oent resisting shear and staggered truss. References AISC. (2002). Steel design guide 14: staggered truss fraing.. Chicago: Aerican Institute of Steel Construction: AISC. Jijo John, S. P. (2015.). Behavior of steel staggered truss under seisic loading. International Journal of Civil Engineering and Technology vol. 6, Sivaji atturi, E. A. (2016.). A study on staggered truss frae steel. Global Journal for Research Analysis, vol. 5, Zhang, C. a. (2012.). Coparative experiental investigation on steel staggered-truss constructed different joints in fire. Elsevier, Vol. 77,