长行程屈曲约束支撑拟静力试验

为研究长行程屈曲约束支撑(buckling restrained brace,BRB)的抗震性能,针对不同有效屈服长度比的屈曲约束支撑进行了拟静力试验研究,对比分析了试件的滞回曲线、骨架曲线、延性系数、耗能能力、刚度退化和强度退化等性能指标.结果表明:高有效屈服长度比能够有效提高试件的极限承载力和极限位移;长行程屈曲约束支撑的延性系数为2.54～3.60,延性较好;有效屈服长度比对长行程屈曲约束支撑的刚度退化性能影响不大;高有效屈服长度比的长行程屈曲约束支撑,强度退化更稳定;抗震性能有所提高.

Quasi-static test study on the long-stroke buckling restrained braces

In order to study the seismic performance of the L-BRB(Long-stroke Buckling restrained braces, L-BRB), two groups of BRBs with different effective yield length ratio were designed and the quasi-static test were carried out. The hysteretic curves, skeleton curves, ductility coefficient, energy dissipation, stiffness degradation, and strength degradation of specimens were obtained compared and analyzed. It was shown from the results that the ultimate bearing capacity and ultimate displacement of specimens with higher effective yield length ratio were effectively improved. The ductility coefficient of two long-stroke BRB was 2.54 and 3.6, indicating well ductility. The stiffness degradation of the long-stroke BRBs is slightly influenced by the effective yield length ratio. The strength degradation of the Long-stroke BRBs became more stable and the seismic performance was improved by increasing the effective yield length ratio appropriately.