橡胶支座基础隔震结构隔震层软限位加固方法研究

Study on Reinforcement Method of Isolation Layer Soft Limiting Displacement of Rubber Bearing Isolation Buildings

按现行建筑抗震规范建造的橡胶支座基础隔震结构遭遇远场大震或近断层脉冲型地震作用时,隔震层可能发生过大变形,造成隔震支座侧倾失稳。本文提出隔震层软限位加固方案,给出软限位加固主要参数预留距离、限位刚度、阻尼的设计与优化方法。取一栋橡胶支座基础隔震钢筋混凝土框架结构,以近断层地震动作用为例,对软限位加固参数的设计与优化进行了介绍。优化软限位加固设计参数,可获得隔震层限位与上部结构减震的良好效果。同时给出了两种适用的软限位加固装置。

The rubber bearing isolation layer displacement will be very large when existing isolation buildings are impacted by far-field strong ground motions or near-fault pulse-type ground motions. The reinforcement project of soft limiting displacement is presented. The optimizing design method of soft limiting displacement parameters, which are reserve displacement, limit stiffness and damping, are proposed. A base-isolating RC frame structure is designed according to the Code for Seismic Design of Building. Near-fault pulse-type ground motions are selected. The optimizing design methods of soft limiting displacement parameters are introduced to the existing base- isolating RC frame structure. The effect of limiting displacement and isolation will be obtained simultaneously if soft limiting parameters are elected right. Two kinds of soft limiting displacement devices are proposed.