Among the passive dampers, using Vertical Link Beam (VLB) is one of the most effective and simplest methods, while not embedded in the floor they can be easily replaced after earthquakes. These dampers dissipate a major part of the input energy resulting in a minimized damage of the main structural components of system. This paper presents a numerical study on the impact of flange width of VLB on cyclic performance of chevron braced steel frames. Despite most previous research projects in which wide-flange I sections were considered for the VLB and the length of VLB was studied, here, the objective is to investigate the possibility of using narrower flange. Verification has been made on the basis of the experimental results from the IPE160 model. By changing the flange width, the cyclic behavior has been investigated. The results show that while the vertical link beam has sufficient lateral support, in spite of the flange width reduction, stable hysteretic cycles still form accompanied with considerable energy dissipation. Based on the hysteretic curves, using modification of the narrower flange section, the shear force at last cycle increased about 20.74% and 16.17% in IPE160 VLBs with a half and quarter flange width respectively, and the proportion of VLB in plastic energy dissipation increased from 78.9% to 90.4% in half flange VLB and from 74.2% to 90.9% in quarter flange VLB only by this simple modification, showing an increase in ductility of the system.
Boukamp, J.G. and Vetr, M.G. (1994) Design of eccentrically braced test frame with vertical shear link. Proceeding of the 2nd International Conference on Earthquake Resistant Construction and Design, Berlin, Germany, June.
Williams, M.S. and Albermani, F. (2003) Monotonic and cyclic tests on shear diaphragm dissipators for steel frames. Civil Eng. Res. Bulletin, 23, 1-34.
Berman, J.W. and Bruneau, M. (2007) Experimental and analytical investigation of tubular links for eccentrically braced frames. Eng. Struct., 29(8), 1929-1938.
Zahrai, S.M. and Moslehi Tabar, A. (2006) Cyclic Behavior of steel Braced frames using shear panel system. Asian Journal of Civil Engineering, 7(1), 13-26.
De Matteis, G., Formisano, A., Panico, S., and Mazzolani, F.M. (2008) Numerical and experimental analysis of pure aluminum shear panels with welded stiffeners. Comput. Struct., 86(6), 545-555.
Ozhendekci, D. and Ozhendekci, N. (2008) Effects of the frame geometry on the weight and inelastic behavior of eccentrically braced chevron steel frames. J. Construct. Steel Res., 64(3), 326-343.
Hossain, M.R., Ashraf, M., and Albermani, F. (2009) Numerical evaluation of yielding shear panel device: A sustainable technique to minimize structural damages due to earthquakes. Universitas 21 International Graduate Research Conference, Melbourne-Brisbane, Australia, November-December, 65-68.
Hossain, Md.R, Ashraf, M., and Albermani, F. (2011) Numerical modelling of yielding shear panel device for passive energy dissipation. Thin-Wall. Struct., 49(8), 1032-1044.
Zahrai, S.M. and Moslehi Tabar, A. (2013) Analytical study on cyclic behavior of chevron braced frames with shearpanel system considering post-yield deformation. Canadian Journal of Civil Engineering, 40(7), 633-643.
Rai, D.C., Annam, P.K., and Pradhan, T. (2013) Seismic testing of steel braced frames with aluminum shear yielding dampers. Eng. Struct., 46, 737-747.
Zahrai, S.M. (2015) Cyclic testing of steel braced frames with IPE shear panels. Steel and Composite Structures, 19(5), 1167-1184.
BHRC (2014) Iranian code of practice for seismic resistance design of buildings: Standard No. 2800 (4th Version) Building and Housing Research Center.
Miranda, E. (1993) Site dependent strength reduction factor. J. Struct. Eng., ASCE, 119(12), 3503-3519.
Applied Technology Council (1992) Guidelines for Seismic Testing of Components of Steel Structures. Report ATC-24.
Zahrai, S. M., & Parsa, A. (2015). Effect of Flange Width of Vertical Link Beam on Cyclic Behavior of Chevron Braced Steel Frames. Journal of Seismology and Earthquake Engineering, 17(4), 281-292.
Seyed Mehdi Zahrai; Amir Parsa. "Effect of Flange Width of Vertical Link Beam on Cyclic Behavior of Chevron Braced Steel Frames". Journal of Seismology and Earthquake Engineering, 17, 4, 2015, 281-292.
Zahrai, S. M., Parsa, A. (2015). 'Effect of Flange Width of Vertical Link Beam on Cyclic Behavior of Chevron Braced Steel Frames', Journal of Seismology and Earthquake Engineering, 17(4), pp. 281-292.
Zahrai, S. M., Parsa, A. Effect of Flange Width of Vertical Link Beam on Cyclic Behavior of Chevron Braced Steel Frames. Journal of Seismology and Earthquake Engineering, 2015; 17(4): 281-292.