An analytical model for shear links in eccentrically braced frames

  • Ashtari, Amir (Department of Civil Engineering, Science and Research Branch, Islamic Azad University) ;
  • Erfani, Saeed (Department of Civil Engineering, Amirkabir University of Technology)
  • Received : 2016.06.29
  • Accepted : 2016.10.19
  • Published : 2016.10.30


When an eccentrically braced frame (EBF) is subjected to severe earthquakes, the links experience inelastic deformations while beams outside of the link, braces and columns are designed to remain elastic. To perform reliable inelastic analyses of EBFs sufficient analytical model which can accurately predict the inelastic performance of the links is needed. It is said in the literature that available analytical models for shear links generally predict very well the maximum shear forces and deformations from experiments on shear links, but may underestimate the intermediary values. In this study it is shown that available analytical models do not predict very well the maximum shear forces and deformations too. In this study an analytical model which can accurately predict both maximum and intermediary values of shear force and deformation is proposed. The model parameters are established based on test results from several experiments on shear links. Comparison of available test results with the hysteresis curves obtained using the proposed analytical model established the accuracy of the model. The proposed model is recommended to be used to perform inelastic analyses of EBFs.


  1. AISC 341 (2010), Seismic provisions for structural steel buildings, American Institute of Steel Construction; Chicago, IL, USA.
  2. Berman, J.W. and Bruneau, M. (2007), "Experimental and analytical investigation of tubular links for eccentrically braced frames", Eng. Struct., 29(8), 1929-1938.
  3. Daneshmand, A. and Hosseini Hashemi, B. (2012), "Performance of intermediate and long links in eccentrically braced frames", J. Construct. Steel Res., 70, 167-176.
  4. Ibarra, L.F. and Krawinkler, H. (2005), "Global collapse of frame structures under seismic excitations", Report No. 152; The John A. Blume Earthquake Engineering Center, Department of Civil and Environmental Engineering, Stanford University, CA, USA.
  5. Kanvinde, A.M., Marshall, K.S., Grilli, D.A. and Bomba, G. (2014), "Forensic analysis of link fractures in eccentrically braced frames during the February 2011 Christchurch Earthquake: Testing and simulation", J. Struct. Eng., 141(5), 04014146.
  6. Kasai, K. and Popov, E.P. (1986), "General behavior of WF steel shear link beams", J. Struct. Eng., 112(2), 362-282.
  7. Koboevic, S., Rozon, J. and Tremblay, R. (2012), "Seismic performance of low-to-moderate height eccentrically braced steel frames designed for North American seismic conditions", J. Struct. Eng., 138(12), 1465-1476.
  8. Lian, M., Su, M. and Guo, Y. (2015), "Seismic performance of eccentrically braced frames with high strength steel combination", Steel Compos. Struct., Int. J., 18(6), 1517-1539.
  9. Montuori, R., Nastri, E. and Piluso, V. (2015), "Seismic response of EB-frames with inverted Y-scheme: TPMC versus eurocode provisions", Earthq. Struct., Int. J., 8(5), 1191-1214.
  10. Okazaki, T. and Engelhardt, M.D. (2007), "Cyclic loading behavior of EBF links constructed of ASTM A992 steel", J. Construct. Steel Res., 63(6), 751-765.
  11. Ohsaki, M. and Nakajima, T. (2012), "Optimization of link member of eccentrically braced frames for maximum energy dissipation", J. Construct. Steel Res., 75, 38-44.
  12. Okazaki, T., Engelhardt, M.D., Hong, J.K., Uang, C.M. and Drolias, A. (2014), "Improved link-to-column connections for steel eccentrically braced frames", J. Struct. Eng., 141(8), 04014201.
  13. O'Reilly, G.J. and Sullivan, T.J. (2013), "Direct displacement-based seismic design of steel eccentrically braced frame structures", Bull. Earthq. Eng., 11(6), 2197-2231.
  14. O'Reilly, G.J. and Sullivan, T.J. (2016), "Fragility functions for eccentrically braced steel frame structures", Earthq. Struct., Int. J., 10(2), 367-388.
  15. Ramadan, T. and Ghobarah, A. (1995), "Analytical model for shear-link behavior", J. Struct. Eng., 121(11), 1574-1580.
  16. Richards, P.W. and Uang, C.M. (2005), "Effect of flange width-thickness ratio on eccentrically braced frames link cyclic rotation capacity", J. Struct. Eng., 131(10), 1546-1552.
  17. Richards, P.W. and Uang, C.M. (2006), "Testing protocol for short links in eccentrically braced frames", J. Struct. Eng., 132(8), 1183-1191.
  18. Ricles, J.M. and Popov, E.P. (1994), "Inelastic link element for EBF seismic analysis", J. Struct. Eng., 120(2), 441-463.
  19. Wang, F., Su, M., Hong, M., Guo, Y. and Li, S. (2016), "Cyclic behaviour of Y-shaped eccentrically braced frames fabricated with high-strength steel composite", J. Construct. Steel Res., 120, 176-187.
  20. Xu, X., Zhang, Y. and Lou, Y. (2016), "Self-centering eccentrically braced frames using shape memory alloy bolts and post-tensioned tendons", J. Construct. Steel Res., 125, 190-204.