地震动频谱特性对隔震结构响应及损伤影响研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (20) : 203-208.

论文

杜东升，王曙光，刘伟庆，李威威

作者信息 +

Research on seismic responses and damage of base isolated structure impacted by spectral characteristics of earthquake ground motion

DU Dong-sheng，WANG Shu-guang，LIU Wei-qing，LI Wei-wei

Author information +

文章历史 +

摘要

针对地震动复杂频谱特性对隔震结构响应及损伤影响进行研究，用加速度反应谱平均周期Tr表征地震动周期特性，用Bouc-Wen模型及刚度退化的Bouc-Wen模型分别描述隔震层与上部楼层的滞变特性，建立隔震结构的质点系非线性分析模型，考虑隔震支座压剪相关性与拉压性能差异建立隔震体系损伤指数模型，分析不同地震动输入加速度幅值及不同Tr与对隔震结构地震反应、损伤影响规律。分析表明，在地震动高频范围内隔震结构响应随输入加速度峰值增加而增加，但对长周期地震动，输入加速度峰值对隔震结构地震反应影响较小，地震反应呈较大离散性、无规律性；在相同加速度幅值输入下隔震层地震反应、损伤的离散性远大于上部结构，在共振区内虽出现最大地震反应，但也会出现较小地震反应，表明隔震结构瞬时共振为非常复杂的过程。研究可为揭示地震动特性与隔震结构地震反应及损伤的关联性提供分析依据。

Abstract

The complicacy of spectral characteristics of earthquake ground motion has been gradually realized by researchers. But the effect of it on structural responses and damage required further study. The nonlinear characteristic and time-varying of frequency of base isolated structure make this effect more complicated. The response spectral average period Tr is used to represent the cyclical nature of earthquake ground motion. The base isolated structure is simplified to a two-mass model, and the Bouc-Wen model and the stiffness degradation of Bouc-Wen model are used to simulate the hysteresis of isolation story and superstructure, respectively. Referring to the Park-Ang damage index model and considering the compression-shear correlation and tension-compression difference of isolators, the damage index model of IS is established. The nonlinear seismic responses and damage of base isolated structure under earthquake ground motion with different Tr are analyzed. The results show that the seismic response and damage all increased with the increase of peak of acceleration seismic wave at the range of high frequency of the wave, but it is discreteness and irregularly at the long period of seismic wave. The discreteness of seismic response of isolation layer is larger than sup-structure, and it is a more significant when Tr is within the range of frequency of IS, which indicate that instantaneous resonance of IS is a complex phenomenon. This study reveals the characteristics of earthquake ground motion associated with seismic responses and damage of base isolated structure.

导出引用

杜东升，王曙光，刘伟庆，李威威. 地震动频谱特性对隔震结构响应及损伤影响研究[J]. 振动与冲击, 2015, 34(20): 203-208

DU Dong-sheng，WANG Shu-guang，LIU Wei-qing，LI Wei-wei . Research on seismic responses and damage of base isolated structure impacted by spectral characteristics of earthquake ground motion[J]. Journal of Vibration and Shock, 2015, 34(20): 203-208

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