【摘要】 铅芯橡胶支座(LRB)参数的优化配置是大型LRB基础隔震储罐设计的关键问题。采用Bouc-Wen模型模拟LRB的非线性力学性能,结合Newmark增量法和龙格库塔积分法求解了隔震储罐非线性动力方程,得到了不同类型场地上大型LRB隔震储罐的地震响应特点和设计参数优化配置规律。研究结果表明:支座隔震频率是影响大型隔震储罐减震效果的主要参数。I类场地上最优隔震频率范围为0.5～5rad/s,II类、III类场地上最优隔震频率范围为2～5rad/s,IV类场地上最优隔震频率范围为1.5～3rad/s。支座屈服强度对储罐地震响应的影响取决于场地类型和隔震频率。在II和III类场地上存在最优屈服强度使得基底剪力最小,且最优屈服强度随隔震频率增大而增大。更多还原

【Abstract】 The optimal configuration of parameters of LRB is a key step in design of large-scale LRB base isolated storage tank.The Bouc-Wen model was adopted to simulate the non-linear hysteretic characteristics of force-displacement relationship for lead plug rubber bearing(LRB).The dynamic nonlinear equations of motion of isolated storage tank was solved by the Newmark’s step-by-step method and Runge-kutta method.The seismic response characteristics and optimal parameters of the large-scale LRB base-isolated storage tank at different sites were investigated.The results indicate that isolation frequency is the primary parameter that affects the isolation effectiveness of the isolated storage tank.The optimal ranges of isolation frequency of large-scale base-isolated storage tank on site I,Site II,Site III and Site IV are 0.5-5rad/s,2-5rad/s,2-5rad/s and 1.5-3rad/s respectively.The influence of the bearing’s yield strength on the seismic response of storage tank depends on the site type and isolation frequency.There are optimum yield strength that makes the base shear minimum on Site II and Site III.Further,the optimum yield strength increases as the isolation frequency increases.更多还原