加层隔震结构的简化反应分析

对剪切型加层隔震结构地震反应问题的简化分析方法进行了研究。首先,对于原结构为剪切型多质点体系,用第一振型将原结构展开后,可以将原结构近似用一个单自由度结构来代替,并将附加层看作一个单自由度体系,这样加层隔震结构可以按双自由度系统进行初步分析,并用振型叠加反应谱法求解此双自由度系统的地震反应。并给出了算例,计算结果表明加层隔震结构比原结构的地震作用力降低了23.72%。

Analysis on Simplified Response Analysis of Structures with Isolation Add-layer

The simplified response analysis of structures with add-layer of base isolation is studied.According to the situation,the structure is multi-degree shear structure,the structure is replaced by a single-degree structure.At the same time the add-layer looks as a single-degree structure,so the new structure is a free-degree structure.The mode analysis response spectrum method is used to disconnect the equations.An example is given to show how to use this method.The results show that compared with original structure the isolation add-layer can reduce 23.72% of earthquake action.