مشخصات پژوهش

As of today, a decisive conclusion regarding the effect of flanges on the overstrength factor of short I-shaped shear links is still lacking. Accordingly, to address this gap in knowledge, this paper relies on the nonlinear finite element analysis to explore the flange contribution in the ultimate shear strength of (very) short Low-Yield-Point (LYP) steel shear links. To this end, 147 I-shaped links made from two LYP steels with a yield stress of 100 and 225 MPa are numerically analyzed and compared considering the effects of certain factors, including the contribution of flanges in shear, boundary conditions associated with the shear panel, and strain hardening of both flange and web steels due to large inelastic rotations. According to the results, the flanges contribution in the shear has two primary sources. The first is the shear resistance of flange plates, and the second is the hardening effect of flange steel under large inelastic rotations. The flange contribution in shear increases with decreasing the Non-dimensional Web Slenderness (NWS) parameter. Accordingly, links with heavy flanges and low NWS parameter could develop a significant contribution in shear and high overstrength factor. The maximum contribution of the flanges reaches about 36% and 43% for the links fabricated from, respectively, L100 and L225 steels with an NWS parameter of 0.1. In this regard, new diagrams based on the NWS parameter were proposed to find out the flange contribution in the shear strength of the links.