【摘要】 选用国标Q235热轧钢材,采用三个型钢品种,以三种截面、两种组合方式设计并制作了六个防屈曲支撑试件,进行了低周反复荷载试验。研究了防屈曲支撑恢复力的特点,讨论了Bouc-Wen等模型用于计算恢复力-变形滞回曲线的可行性,指出了将其用于防屈曲支撑时,在力学参数非对称性、材料塑性硬化等方面的不足。在此基础上,提出了考虑这些影响的三个参数,建议了三个参数的实用计算方法,建立了改进的Bouc-Wen恢复力计算模型。与UCB静力反复单调增位移控制加载和地震诱发位移控制加载的试验研究结果进行了对比,与该文试验结果进行了对比。表明在恢复力-变形滞回曲线、割线刚度及其退化规律、等效粘滞阻尼比等方面吻合较好。提出了适合于防屈曲支撑工业产品性能测试的若干参数,针对结构设计及分析提出了建议。更多还原

【Abstract】 With hot-rolled steel Q235 in China,six specimens of buckling-restrained braces are designed,manufactured and tested.The loops’ characterization of the restoring force versus the deformation is studied.The feasibility of modeling the BRB specimen with the Bouc-Wen model is discussed,and some shortages leading to considerable errors to the restoring force,such as the absence of asymmetrically mechanical properties and plastic hardening etc,are indicated.On the basis,an improved model with three suggested parameters is established.The practical calculation formulas for the three parameters are suggested.Comparisons are made between the calculated results with the model and the tested results of both UCB(under the low cycle increasingly imposed displacement tests and earthquake induced displacement-imposed test respectively) and that of the paper.It is approved that the model performs better than the unimproved model on the hysterical loops,equivalent stiffness and damping ratio.Some suggestions are made on the structural design and analysis of BRB product tests.更多还原