【摘要】 在建筑物和基础之间设置滑板支座或铅芯橡胶支座,都能起到隔震作用,而且前者隔震效果更明显。如果将两种支座按一定比例组合在一起,承担结构的竖向荷载,可以形成一种组合隔震系统。通过对安装组合隔震系统的模型进行低周反复加载试验,研究这种组合隔震系统的力学性能。分析了在3种不同竖向荷载作用下,滑板和橡胶支座的比例分别为1/4、1/3和1/2的9个工况下的水平滞回曲线和骨架曲线。试验结果表明:组合隔震系统有良好的耗能能力,并且,在橡胶支座能够提供足够回复力的前提下,滑板支座越多,隔震效果越好,系统的耗能能力越强。并通过对滞回曲线的分析,给出了组合系统简化恢复力模型,为安装该系统的隔震建筑的计算分析提供参考。更多还原

【Abstract】 The sliding or lead rubber bearing between the upper structure and the foundation could isolate the seismic vibration,and the former is more effective.The sliding and lead rubber bearing can be combined in some way to resist the vertical loads,so that a new type of combined seismic isolation system is formed.In this research,the mechanical properties of the combined seismic isolation system were investigated.Three groups of models with combined seismic isolation systems were designed and the bearing ratio of the sliding and lead rubber bearing was 1/4,1/3 and 1/2.Under three types of vertical loading,low cycle loading tests in horizontal direction were carried out.The test results show that the new system has better energy dissipation capacity.In addition,if the rubber could bear enough vertical loading,the system has better performance with more sliding fraction.The restoring force models of the combined seismic isolation system have been presented in this paper by analyzing the hysteretic loops,and the results are very useful for the analyzing of the structures with the new system.更多还原