【摘要】 本文考虑地震动的随机性,运用概率密度演化方法对基础隔震结构的随机响应进行研究。上部结构与隔震层分别采用刚度退化的Bouc-Wen模型与Bouc-Wen模型,建立隔震结构的概率密度演化方程,直接应用四阶龙格-库塔方法迭代求解隔震结构的非线性的响应,得出隔震结构在8度罕遇地震下每层的位移概率。结果显示隔震结构较非隔震结构上部结构的位移大大地减小了,上部结构具有足够的安全性。结构整个概率密度演化过程显示了隔震结构的响应信息,概率密度演化方法能够有效评估隔震结构的抗震性能。更多还原

【Abstract】 This paper adopts the probability density evolution method to study the stochastic seismic responses of base isolated structure considering the randomness of seismic ground motion.The Bouc-Wen model and the BoucWen model with stiffness degradation are used to simulate the isolation layer and the upper structure.The probability density evolution equation of isolated structure is derived,and the Runge-Kutta method with iterative solution to the nonlinear response of isolated structure is adopted.The results show that the displacement of the upper structure of the seismic isolation system substantially reduces under seismic intensity 8,which is compared with the non-isolation system.The upper structure is in comparative safety.The probability density evolution process shows information of the response of the isolated structure,and it can effectively assess the seismic performance of isolated structures.更多还原