【摘要】 为了研究隔震结构关键设计参数对其在地震作用下整体可靠度的影响,将隔震结构简化的两质点计算模型,隔震层采用Bouc-Wen模型来模拟,上部结构采用刚度退化的Bouc-Wen模型来模拟,建立了隔震结构的运动方程,结合虚拟激励法与可靠度理论,分析了隔震结构在不同周期比、屈重比与阻尼比下的平稳随机地震响应与动力可靠度。并以整体可靠度为目标,对隔震结构的设计参数进行优化选取。将上述理论运用于设防烈度为8度的某隔震结构,分析了隔震层与上部结构的层间位移峰值的随机地震响应,并计算了隔震结构的整体可靠度。研究结果表明,隔震结构的周期比、屈重比及阻尼比的适当选取,能使隔震结构的隔震层与上部结构位移响应均较小,从而使隔震结构整体可靠度较高。从整体可靠度的角度对隔震结构的安全性进行评估,对隔震结构的合理设计及性态控制有指导意义。更多还原

【Abstract】 A simplified two-mass calculating model of a base-isolated structure was established in order to study the effect of crucial design parameters on the system reliability.A Bouc-Wen model was used to simulate the isolation layer and a Bouc-Wen model with stiffness degradation was used to simulate the upper structure.The motion equation of the base-isolated structure was established.The pseudo excitation method and reliability theories were used to analyze the random responses and dynamic reliability of the system under different period ratios,yield force ratios and damping ratios.The design parameters of the base-isolated structure were optimized with the system reliability as an objective.The above theories were used to analyze the stationary random earthquake responses of a base-isolated structure with a 8 degree seismic precautionary intensity.The story displacements and the system reliabilities of the isolation layer and the upperstructure were calculated.The results showed that properly selecting period ratio,yield force ratio and damping ratio can make the displacement responses minimum,so the system reliability of the base-isolated structure is high;validating the safety of base-isolated structures based on system reliability is a guide for structural performance design and state control of base-isolated structures.更多还原