STUDY ON ENERGY DISSIPATION MECHANISM AND DESIGN METHOD OF TRIPLE YIELD BUCKLING-RESTRAINED BRACE

Under the action of tension and compression loads, the force of buckling-restrained brace (BRB) is basically symmetrical and has a full hysteretic curve. It is an energy dissipation component widely used in engineering structures with excellent energy dissipation effect. The traditional BRB does not yield under frequent earthquakes and is unable to provide energy dissipation for structures, and cannot consider the usage requirements of seismic action with different intensities. Based on this, a triple yield buckling-restrained brace (TYBRB) is proposed, and its work principle and mechanical properties are systematically studied through the combination of theory and simulation. The structural composition and working principle of TYBRB are introduced; based on the mechanical analysis, the stiffness equation of TYBRB is established, and the calculation methods of yield bearing capacity and yield displacement of each level are given. The numerical simulation of TYBRB is carried out by ABAQUS, and its mechanical performance and seismic performance superiority are analyzed. The research results show that TYBRB can realize energy dissipation for the first and second yield under small deformations, has obvious triple yield effect, can realize the staged yield energy dissipation by taking into account the seismic action of different intensities, and the energy dissipation performance is superior.