基于刚度比设计的屈曲约束支撑-混凝土框架抗震性能研究

Research on Seismic Performance of Concrete Frame Supported by Buckling Restrained Braces Based on Stiffness Ratio Design

为研究刚度比对屈曲约束支撑—混凝土框架结构体系的影响及其合理的取值范围,分别设计了初始层间位移角不同的三种混凝土框架结构,通过多遇与罕遇地震作用下的动力时程分析,研究了不同刚度比对框架结构层间位移角、层间剪力、支撑滞回耗能率、塑性损伤分布等抗震性能的影响。根据分析结果,给出了屈曲约束支撑与框架部分刚度比合理的取值范围。

To study the influence of stiffness ratio on the performance of buckling-restrained brace-concrete frame structural systems and its likely reasonable value range, three concrete frames with different initial storey drifts are designed and analyzed respectively. By means of dynamic time history analysis of frequent earthquakes and rare earthquakes, the influences of different stiffness ratios on seismic performance of the frame structure, such as the inter-storey drift angle, inter-storey shear force, hysteretic energy dissipation ratio of bracing, plastic damage distribution, etc. Based on the analysis results, the likely suitable stiffness ratios are proposed for structures with different initial drift angles.