屈曲约束支撑与钢框架节点板连接的抗震性能#br# 试验与分析研究

屈曲约束支撑作为耗能减震构件，其与钢框架连接形成屈曲约束支撑钢框架结构体系。然而目前对于屈曲约束支撑与节点板不同连接形式的抗震性能和破坏模式尚缺乏研究。为了获悉不同连接形式对屈曲约束支撑钢框架结构抗震性能和破坏机理的影响，进行5榀屈曲约束支撑与钢框架节点板连接试件的水平低周往复荷载试验，观察试验现象和破坏特征，考察屈曲约束支撑与节点板两端采用销轴连接、螺栓连接、焊接连接和混合连接对钢结构抗震性能的影响，研究屈曲约束支撑与钢框架节点板连接试件的滞回曲线、骨架曲线、延性系数、刚度退化、耗能能力等抗震性能指标，探讨屈曲约束支撑与钢框架节点板转动变形和关键部位的应变规律，分析结构的破坏模式和各构件屈服顺序。结果表明：屈曲约束支撑的芯板先于梁、柱和节点板屈服，试件滞回曲线饱满，表现出良好的抗震性能和延性。文章研究成果以期为屈曲约束支撑钢框架结构设计和应用提供科学依据。

Seismic performance tests and analysis of connections between buckling restrained braces and steel frame

Buckling restrained brace (BRB) as an energy dissipation member is connected with steel frame to form a buckling restrained braced steel frame structure system. However, the effects of different connection types on seismic performance and mechanical properties of the connections between BRB and steel frame have been rarely studied. To understand the seismic performance and failure mechanism of BRB and steel frame due to different connection types, tests on five BRB-steel frame connection specimens were performed under horizontally low cyclic loading. Consequently, the phenomena and failure characteristics of the specimens were carefully observed, and the effects of the pinned shaft connection, bolted connection, welded connection and mixed connection on the seismic performance of the steel structure were investigated; the seismic performance of specimens with BRB-steel frame was studied for the hysteretic curves, skeleton curves, ductility coefficient, stiffness degradation, energy dissipation capacity and so on; the rotational forms and the strain laws of the key parts were also discussed; the failure mode of the steel structure and the yielding sequence of all structural components were analyzed. The test results show that the core plates of BRB yield before the beam, column and the gusset plate; the hysteretic curves of the specimen are plump, indicating that BRB possesses good seismic performance and ductility. The research results can provide scientific reference for the design and application of BRB in steel frame structures.