软夹层地基上多层隔震结构模型振动台试验研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (24) : 104-110.

论文

于旭1,2 庄海洋2 朱超2 陈苏2

作者信息 +

Shaking table model test for multi-story isolated structure on the ground with softer interlayer

Yu Xu1,2, Zhuang Hai-yang 2，Zhu Chao 2,CHEN Su2

Author information +

文章历史 +

摘要

基于软夹层地基和刚性地基上多层隔震结构体系地震反应的振动台模型试验，研究软夹层地基上隔震结构体系的动力特性、地基地震反应特性、上部结构加速度反应特征，分析基础与隔震层的转动效应及其对隔震效果的影响。试验结果表明：软夹层地基对地震动输入起明显的削弱作用；软夹层地基上SSI效应对隔震结构动力特性影响较大， SSI效应降低了隔震结构体系的一阶自振频率，显著增大了体系的阻尼比；软夹层地基上SSI效应使隔震结构基础及隔震层产生转动反应，隔震层对基础转动角加速度反应有一定的放大作用，与输入地震动的特性有关；软夹层地基上SSI效应可增大也可能减小隔震结构上部结构的地震反应，隔震效果与隔震层转动效应的强弱密切相关，隔震层转动效应显著时，隔震结构楼层加速度峰值放大系数增大，隔震效果降低，而隔震层转动效应减弱时，楼层加速度峰值放大系数与刚性地基时相似，隔震效果较好。

Abstract

Based on shaking table model test on rigid and softer interlayer ground, dynamic characteristics of multi-story isolated structure and seismic behavior of ground are studied,superstructure acceleration response and turning effects of foundation and isolation layer are analyzed, the impact of turning effects on isolation effectiveness is studied.Test results show that ground motion is obviously weakened due to softer interlayer ground, soil-structure interaction(SSI) has more effects on dynamic characteristic of isolated structure on softer interlayer ground, the first order natural frequency is reduced and damping ratio is largely increased for SSI, the turning effects of the foundation and isolation layer are occurred on the softer interlayer ground due to SSI, the isolation layer has amplification effect on rotational acceleration response of foundation, which depends on the type of the earthquake motion inputted. SSI can increase or decrease the seismic response of isolated structure on softer interlayer ground, isolation effectiveness is closely related to the intensity of turning effects on isolation layer,when turning effects on isolation layer is enhanced, amplification factors of acceleration amplitude of floors for isolated structure are increased, isolation effectiveness is weaken, when turning effects on isolation layer is weakened, amplification factors of acceleration amplitude of floors for isolated structure are similar to the ones on rigid ground, isolation effectiveness is satisfied.

导出引用

于旭1,2 庄海洋2 朱超2 陈苏2. 软夹层地基上多层隔震结构模型振动台试验研究[J]. 振动与冲击, 2015, 34(24): 104-110

Yu Xu1,2, Zhuang Hai-yang 2，Zhu Chao 2,CHEN Su2. Shaking table model test for multi-story isolated structure on the ground with softer interlayer[J]. Journal of Vibration and Shock, 2015, 34(24): 104-110

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