底部带有屈曲约束支撑的摇摆墙框架结构抗震性能分析

摘要

Based on a damage concentrated model,a rocking wall frame (RWF)structure system with buckling-restrained braces (BRBs)in base was put forward to reduce the displacement response of RWF under a strong earthquake and mitigate the damage concentration effect of a buckling-restrained braced frame (BRBF).Taking a 9-storey steel frame as the benchmark model,pushover analysis and dynamic time history analysis were conducted to comparatively study its aseismic performance.The results showed that before BRBs yield,this structure is similar to the shear wall frame (SWF),the additional lateral stiffness is provided by BRBs and transferred through the rocking wall;after BRBs yield, the structure tends to rock,the rocking wall controls the lateral deformation mode and BRBs consume seismic energy to lead to full use of the aseismic capacity of each part.%为减小摇摆墙框架结构强震下位移响应及缓解屈曲约束支撑框架的损伤集中效应，基于损伤集中模式，提出了底部带有屈曲约束支撑的摇摆墙框架结构体系。以9层钢框架为基准模型，通过推覆分析和动力时程分析对比研究了该结构体系的抗震性能。分析结果表明：BRB 屈服前，该结构体系类似框剪结构，BRB 提供抗侧刚度并通过墙体进行传递；BRB 屈服后，结构发生摇摆，墙体控制变形模式，BRB 通过滞回耗能，可以充分发挥结构各部分的抗震能力。