优化复合型金属阻尼器等效模型及减震性能
Equivalent Model and Damping Performance of Optimized Compound Mental Damper

基于金属阻尼器屈服强度较高且不能调控的不足，提出由低屈服点钢和普通碳素钢组成的复合型金属阻尼器。首先,将“最大刚度”和“满应力状态”同时作为优化目标对边缘镂空的钢板阻尼器进行拓扑优化，获得最优的阻尼器形状;然后,针对复合型金属阻尼器的受力特点建立偏心交叉支撑等效模型，得到阻尼器屈服强度和屈服位移的近似解析解。数值分析结果表明优化复合型金属阻尼器具有滞回曲线饱满且应力均匀的优点，且可按需求调控阻尼器的屈服强度。对装有复合型金属阻尼器的框架整体抗震减震能力进行弹塑性分析，结果表明复合型金属阻尼器的减震效果明显，而经过优化的金属阻尼器性能更加优越。
The traditional metal dampers have the disadvantages such as higher yield point and inadequate adjustability. To overcome these deficiencies, a compound mental damper which comprises the low yield point steel plates and common steel plates is presented. The optimization objectives including “maximum rigidity” and “full stress state” are proposed to obtain the optimal shape of compound mental damper. The numerical simulation results show that the compound mental damper has the advantages such as the full hysteresis performance and uniform stress state, and the integral yield point can be regulated. In view of the mechanical characteristic of the compound metal damper, the equivalent model of eccentric cross bracing is established, and the approximate analytical solution of the yield strength and the yield displacement is proposed. The nonlinear simulation analysis is carried out for the overall aseismic capacity of the frame structures with the compound mental damper. It is verified that the compound mental damper has better energy dissipation capacity and more superior seismic performance, especially for the damper with optimized shape.