【摘要】 橡胶支座基础隔震结构遭遇近断层脉冲型地震动作用时,隔震层变形过大,需要限位。提出了软碰撞限位方案。按抗震规范设计橡胶支座隔震钢筋混凝土框架结构,选取近断层地震动记录,分析了限位主要参数预留距离、限位刚度和阻尼对隔震结构响应的影响。结果表明,预留距离增大,限位刚度需求增大,限位效果减弱;限位刚度增大,隔震层最大位移减小,上部结构层间最大位移增大;在一定范围内适当增大阻尼可减小隔震层最大位移与上部结构的层间最大位移。合理选用限位参数,可同时获得良好的限位与减震效果。提出了限位参数的优选方法。更多还原

【Abstract】 The rubber bearing isolation layer displacement will be very large when isolated buildings are impacted by near-fault pulse-type ground motions.The project of soft collision displacement limit was presented.A base-isolation RC frame structure was designed according to the Code for Seismic Design of Building.Near-fault pulse-type ground motions were selected.The influences of key parameters,such as reserve displacement,limit stiffness and damping,on responses of isolated structure were analyzed.The results show that if the reserve displacement increases,the requirement of limit stiffness increases and the effect of displacement limit reduces.Along with increase of limit stiffness,the isolation layer displacement decreases,but the maximum storey drift of superstructure increases.The maximum isolation layer displacement and maximum storey drift of superstructure decrease if damping increases properly.The effect of displacement limit and isolation will be obtained simultaneously if limit parameters are elected rightly.The optimization of limit parameters is proposed.更多还原