基于整体可靠度的隔震结构参数优化分析

孙 臻;刘伟庆;王曙光;杜东升

振动与冲击 ›› 2013, Vol. 32 ›› Issue (12) : 6-10.

PDF(1779 KB)
PDF(1779 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (12) : 6-10.
论文

基于整体可靠度的隔震结构参数优化分析

  • 孙 臻,刘伟庆,王曙光,杜东升
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Parameters optimization of base isolated structure based on system reliability

  • SUN Zhen,LIU Wei-qing,WANG Shu-guang, DU Dong-sheng
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摘要

为了研究隔震结构关键设计参数对其在地震作用下整体可靠度的影响,将隔震结构简化的两质点计算模型,隔震层采用Bouc-Wen模型来模拟,上部结构采用刚度退化的Bouc-Wen模型来模拟,建立了隔震结构的运动方程,结合虚拟激励法与可靠度理论,分析了隔震结构在不同周期比、屈重比与阻尼比下的平稳随机地震响应与动力可靠度。并以整体可靠度为目标,对隔震结构的设计参数进行优化选取。将上述理论运用于设防烈度为8度的某隔震结构,分析了隔震层与上部结构的层间位移峰值的随机地震响应,并计算了隔震结构的整体可靠度。研究结果表明,隔震结构的周期比、屈重比及阻尼比的适当选取,能使隔震结构的隔震层与上部结构位移响应均较小,从而使隔震结构整体可靠度较高。从整体可靠度的角度对隔震结构的安全性进行评估,对隔震结构的合理设计及性态控制有指导意义。

Abstract

The simplified two masses calculating model of base isolated structure is established in order to study the system reliability which considering the affection of crucial design parameters. The Bouc-Wen model is used to simulate the isolation layer and the stiffness degradation of Bouc-Wen model is used to simulate the upper structure. The motion equation of the base isolated structure is established. The pseudo excitation method and reliability theories are used to analyze the random responses and reliability of the system under varied period ratios, yield force ratios and damping ratios. The design parameters of the base isolated structure are optimized by reliability objective. Those theories are used to analyze stationary random earthquake responses of a base isolated structure which located in 8 degree seismic precautionary intensity. The story displacements and the system reliabilities of the isolation layer and the superstructure are calculated. The results show that the proper selection of the period ratio, the yield force ratio and the damping ratio can make the displacement responses minimum. So the system reliability of the base isolated structure is high. This research which can assess the reliability and the security totally is instructive for structural performance design and state control of base isolated structure.

关键词

隔震结构 / 两质点计算模型 / Bouc-Wen模型 / 平稳随机地震响应 / 整体可靠度 / 参数优化

Key words

base isolated structure / two mass calculating model / Bouc-Wen model / stationary random earthquake response / system reliability / parameters optimization

引用本文

导出引用
孙 臻;刘伟庆;王曙光;杜东升 . 基于整体可靠度的隔震结构参数优化分析[J]. 振动与冲击, 2013, 32(12): 6-10
SUN Zhen;LIU Wei-qing;WANG Shu-guang;DU Dong-sheng. Parameters optimization of base isolated structure based on system reliability[J]. Journal of Vibration and Shock, 2013, 32(12): 6-10

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