Abstract:
Energy dissipation components are arranged at the column base of the rocking steel braced frame, and the frames on both sides are connected through energy-dissipation links to form a rocking steel braced frame structure with replaceable links. This structure has strong energy dissipation capacity, replaceable and uniform deformation between layers, etc. In order to study its seismic performance, three types of links for the rocking steel braced frame which adopts a single oval hole in the web (LRBF-1) and a diamond-shaped hole (LRBF-2), and stainless-steel stiffener type with no hole (LRBF-3) were designed for the low-cycle reversed loading test. The experimental results show that: each specimen has a full hysteresis curve, excellent energy-dissipating performance, and there is basically no decrease in strength under the same level of cyclic load. The damage is concentrated on the energy-dissipating parts, the structural function can be quickly restored by replacing the energy-dissipating parts. The specimens with hole type link have excellent deformation ability and energy-dissipating performance; and the stainless-steel stiffeners type specimen has a higher ultimate bearing capacity and a slower decrease in stiffness. The finite element analysis reveals that using higher-strength steel for energy-dissipating parts can increase the bearing capacity and stiffness, but energy dissipation efficiency of the structure may decrease. Increasing the thickness of link webs can significantly improves the bearing capacity, stiffness and, the energy dissipation efficiency of later loading stage.