نوع مقاله : علمی - پژوهشی
عنوان مقاله English
نویسندگان English
Steel moment-resisting frames (SMRFs) are widely used in seismic regions because of their high ductility and energy dissipation capacity. However, their relatively low stiffness often leads to excessive lateral deformations and reduced seismic performance. Although conventional bracing systems can improve structural stiffness, challenges such as brace buckling, reduced ductility, and limited energy dissipation capacity may adversely affect their seismic performance. Accordingly, this study proposes a novel toggle-brace-type rotational damper (TBRD) incorporating hourglass-shaped yielding pins (HYPs) as replaceable energy-dissipating elements. Seismic input energy is dissipated through the inelastic deformation of the HYPs, thereby confining damage to the replaceable pins. After validating the numerical modeling technique, three-dimensional finite element models were developed in ABAQUS and subjected to cyclic loading to evaluate the effect of the TBRD on the seismic performance of SMRFs. The results showed that the proposed damper increased elastic stiffness by 1.94–2.19 times, lateral strength by 36.03–47.72%, and energy dissipation capacity by 72.31–94.01% compared with the bare frame. Moreover, effective damping reached approximately 42% at 5% story drift, while effective stiffness remained 39.21–52.03% higher than that of the bare frame at the end of cyclic loading. Based on the findings, the proposed system effectively improves the overall seismic performance of SMRFs.
کلیدواژهها English
