LY315钢屈曲约束支撑耗能性能试验研究

采用新型抗震结构用软钢LY315作为内核材料，设计加工了3根全钢型装配式屈曲约束支撑。对支撑进行了拉压往复加载试验，并对其力学性能进行分析，研究此类新型屈曲约束支撑的耗能性能。结果表明:支撑构造合理，滞回曲线饱满，耗能性能稳定；试件的最大位移延性系数均大于15，抗拉应变强化系数在1.21~1.29，等效粘性阻尼比在0.442~0.465，累积塑性变形均大于500倍的屈服位移；对试件的疲劳加载进行分析，各项参数均满足JGJ 297-2013《建筑消能减震技术规程》的要求，表明试件有良好的低周疲劳性能。

EXPERIMENT ON ENERGY DISSIPATION PERFORMANCE OF LY315 STEEL BUCKLING-RESTRAINED BRACES

Three buckling-restrained braces(BRBs)assembled with section steel were designed using novel soft steel LY315as the core material.Cyclic loading tests on three specimens were conducted to analyze the mechanical properties and the energy dissipation of the new type of BRBs.The results indicate that the structure of BRBs is reasonable and all specimens exhibit a full hysteretic curve and stable energy dissipation performance.The ultimate ductility coefficients of specimens were greater than15.The strain hardening coefficients were between1.21and1.29.The equivalent damping ratios were between 0.442 and 0.465.The cumulative plastic deformations were more than500times the yield displacement.The fatigue loading was analyzed.All performance parameters were able to meet the requirements in JGJ297-2013‘Technical specification for seismic energy dissipation of buildings’,indicating excellent low-cycle fatigue behavior of the BRBs.