Rotation capacity improvement of long link beams in Eccentrically Braced Frames


1 Young Researchers Chub, Khorramabd Branch, Islamic Azad University, Khorramabad, Iran

2 Structural Eng. Div., Faculty of Civil and Architectural Engineering, University of Malayer, Malayer, Iran


Short link beams in Eccentrically Braced Frames (EBFs) are generally preferred to long ones mainly due to their high rotation capacity and energy dissipation under cyclic loadings. However, long links have the advantage of providing openings in the braced spans of EBFs. Based on few tests conducted on long links’ behavior in the literature, the Seismic Provisions (AISC-341-05) limits their rotation capacity to a small value of 0.02 rad. In this paper, a three dimensional finite-element model using ABAQUS is developed for the inelastic nonlinear analysis of long linksto investigate their rotation capacity. It was found that, using some new intermediate stiffeners in addition to those specified in the Seismic Provisions, large rotation capacity for long links can be achieved.