مشخصات پژوهش

This paper aimed to investigate the cyclic performance of short and very short links made of ASTM A992 steel in eccentrically braced frames. An extensive parametric study was conducted using ABAQUS software, considering the effects of local buckling, cumulative damage under repeated loads, and steel fracture on strength and stiffness degradation. The study analyzed 114 isolated I-shaped links with various link lengths, stiffener arrangements, and a wide range of web and flange widths and thicknesses. The results showed that the shear links developed overstrength factors ranging from 1.73 to 2.53, with an average value of 2, indicating that the overstrength factor of 1.5, which is proposed by current seismic provisions, results in unconservative design predictions compared to the test results. Moreover, the rotation capacity of shear links exceeded the AISC 341-22 requirement with a large margin, and the stiffener requirements could be relaxed for very short links. The results also revealed that the link-length-ratio parameter could not represent the actual behavior differences among the shear links, and thus an effective parameter was proposed to determine the overstrength factor of shear links.