三类组合变刚度隔震核岛抗震性能对比研究

Study on seismic performance of three types of combined variable stiffness isolation nuclear islands

基于橡胶支座与滑板支座串联形成高弹性滑板支座(HESLB),协同铅芯橡胶支座(LRB)、橡胶支座(NRB)构成变刚度组合隔震系统应用于核岛结构。首先,结合不同支座力学特性对组合隔震系统力学性能参数进行分析;其次,基于单质点隔震模型给出不同运动状态下的动力方程;最后,针对目标核岛设计3种组合隔震方案并进行数值分析。结果表明:组合隔震方案均具备两阶段刚度特性,LRB+NRB+HESLB组合隔震方案可同时控制核岛加速度与位移响应,具备较好的耗能效果。

Based on the rubber bearing and the sliding board bearing in series to form a high elastic sliding board bearing(HESLB),the lead rubber bearing(LRB)and rubber bearing(NRB)are combined to form a variable stiffness combined seismic isolation system and applied to the nuclear island structure.First,the mechanical performance parameters of the combined isolation system are analyzed based on the mechanical characteristics of different supports;secondly,the dynamic equations under different motion states are given based on the single-particle isolation model;Finally,three combined isolation schemes are designed and numerically analyzed for the target nuclear island.The results show that:the combined isolation schemes have two-stage stiffness characteristics,and the LRB+NRB+HESLB combined isolation scheme can control the acceleration and displacement response of the nuclear island at the same time,and has a good energy consumption effect.