屈曲约束支撑装配式混凝土框架结构抗震性能试验研究

消能减震技术能有效地提高装配式混凝土结构的整体抗震性能，改善其破坏模式。然而，目前对屈曲约束支撑装配式混凝土框架结构尚缺乏试验研究。为了获悉屈曲约束支撑装配式混凝土框架的抗震性能和破坏机理，文章进行3榀屈曲约束支撑装配式混凝土框架和1榀现浇混凝土框架的低周反复荷载试验。研究了地震作用下采用整体式和暗牛腿式预制混凝土梁柱节点的屈曲约束支撑装配式混凝土框架抗震性能，观察和记录试验现象和破坏特征，对各试件的滞回曲线、刚度退化、耗能能力、骨架曲线和延性系数等进行对比分析。试验结果表明：屈曲约束支撑装配式混凝土框架具有良好的耗能能力和延性，能量耗散系数E=1.464?1.759，延性系数?=3.02~3.61，屈曲约束支撑可以有效地提高装配式混凝土框架的抗震性能，改善其失效模式；研发的支撑与梁柱连接节点的连接构造可以有效地实现屈曲约束支撑与装配式混凝土框架在地震作用下的协同受力。文中研究成果将为屈曲约束支撑在多高层装配式混凝土结构中的设计和应用提供科学依据。

Experimental studies on seismic performance of prefabricated concrete frame structures with buckling-restrained braces

Energy-dissipation earthquake-reduction technology can effectively improve the seismic performance of prefabricated concrete (PC) structures and can improve their failure modes. However, studies on the PC frame structures with buckling-restrained braces (BRBs) are still lacking. Cyclic loading tests on three PC frames with BRBs and one cast-in-place concrete frame were conducted to investigate the seismic behavior and failure mechanism of PC frame with BRBs. Seismic performance of PC frames with BRBs and PC beam-column connections fabricated in integral type and hidden corbel type was studied under earthquake action. The experimental phenomena and failure characteristics were observed and recorded. The hysteretic curves, skeleton curves, ductility coefficients, stiffness degradation and energy dissipation capacity of the structures were analyzed. The test results show that the PC frames with BRBs have good energy dissipation capacity and ductility, the ductility coefficient μ is between 3.02 and 3.61, the energy dissipation E is between 1.464 and 1.759. It was verified that BRBs could effectively improve the seismic performance of PC frames and improve their failure modes. Novel construction detail between BRB and PC beam-column connection was developed to ensure the cooperative working between PC frame and BRBs under earthquake action. The studied results can provide scientific basis for the design and application of BRBs in PC frames.