加载制度对具有Bouc-Wen模型特征的结构反应的影响

根据ISO和CUREE两种低周反复加载制度并采用Bouc-Wen恢复力模型计算得到不同参考位移时轻型木结构的力学性能参数，通过对结构极限强度、极限位移、刚度、耗能和强度及刚度退化的分析得到如下的一些结论：1)不同加载制度下得到的轻型木结构力学性能参数是不同的，在利用试验结果对轻型木结构房屋进行性能评价时应该考虑加载制度和参考位移的影响；2)采用ISO加载制度，参考位移为120 mm时结构的极限强度和极限位移较参考位移为60 mm时分别增加12%~13%和66%~68%；采用CUREE加载制度，参考位移为100 mm时结构的极限强度和极限位移较参考位移为50 mm时分别增加4%~6%和55%~58%；3)结构的割线刚度受参考位移的影响较小；4)参考位移对ISO加载制度下的结构耗能、强度及刚度退化影响较大，而对CUREE加载制度下的影响较小.
According to the ISO and CUREE cyclic test loading protocol, some mechanical performance parameters of wood framed constructions were calculated in Bouc-Wen hysteresis model. Based on analysis of the ultimate strength，ultimate displacement, stiffness, energy dissipation and strength and stiffness degradation of wood framed construction, some basic conclusions on the mechanical performance considering the influence of different loading protocols and reference displacements were obtained. The influence of the loading protocols and reference displacements should be taken into consideration in order to evaluate the mechanical performance parameter based on the test results exactly. Reference displacement equal to 120mm resulted in a 12%~13% and a 66%~68% increasing in ultimate strength and ultimate displacement respectively when compared with reference displacement equal to 60mm under ISO protocol. Reference displacement equal to 100mm resulted in a 4%~6% and a 55%~58% increasing in ultimate strength and ultimate displacement respectively when compared with reference displacement equal to 50mm under CUREE protocol. The loading protocol appeared to have little influence on the scant stiffness of the wood framed construction. It was shown that the ISO protocol with different reference displacements had more effect on the energy dissipation and strength and stiffness degradation when compared with the CUREE protocol.