层间隔震结构工作机理研究

Research on working mechanism of story isolation structure

本文建立了层间隔震结构动力分析模型,对层间隔震结构地震反应的主要影响系数进行了分析。结果表明:在一定的频率比范围内,当隔震层的位置较高时,隔震结构下部位移和上部加速度均显著减小,表现出与TMD相似的工作机理;当隔震层的位置较低时,隔震结构下部位移和上部加速度均变化不明显,其工作机理与基础隔震相似。隔震层的阻尼比对层间隔震结构的减震效果也有较大影响,阻尼比越大,减震效果越好。

In this paper, the dynamical analysis model of story isolation structures are established. Main influential parameters of story isolation structures are theoretically investigated. Results indicate that within the scope of certain fiequency ratio, infrastructure displacement and superstructure acceleration of the isolation layer both significantly reduce, when the location of isolation layers is approach to the roof of the structure. Its mechanism is similar to that of TMD and there is no obvious change between infrastructure displacement and superstructure acceleration, when the location of the isolation layer is approach to the base of the structure. Its mechanism is similar to that of base isolation. Damping ratio of isolation layer greatly influences the isolating effect. When the damping ratio increases, the isolating effect is better.