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利用虚拟激励法分析了高层组合隔震体系在平稳随机地震激励下的随机响应。隔震层由叠层橡胶支座、摩擦滑移支座及粘滞阻尼器组成。采用等效线性化处理,建立非线性阻尼多自由度线性模型,采用了能较好模拟长周期地面运动的加速度功率谱密度函数。分别建立隔震层位移和上部结构层间位移的极限状态方程,采用一次二阶矩方法计算结构各层间位移的失效概率,并根据串联系统的可靠度界限理论计算隔震结构的体系可靠度。以江苏省高烈度区宿迁市某25层的高层组合隔震结构为例,通过随机地震响应分析,得到结构隔震层和上部结构位移峰值响应的统计量以及各楼层的失效概率和结构体系可靠度,结果表明高层结构采用组合隔震技术后,体系的动力可靠度较不隔震时有明显提高。
The pseudo-excitation method is used to analyze the random response of the high-rise composite seismic isolation system under steady stochastic seismic excitation. Isolation by the laminated rubber bearings, friction slip bearings and viscous damper composition. Equivalent linearization is used to establish a linear model of nonlinear damped multiple degrees of freedom, and an acceleration power spectral density function that simulates long-period ground motions well is used. The limit state equations of the displacement of the isolation layer and the displacement of the superstructure are established respectively. The first order second moment method is used to calculate the failure probability of the displacement of each layer of the structure. The system reliability of the isolated structure is calculated according to the reliability limit theory of the tandem system . Taking a 25-storey high-rise composite seismic isolation structure in Suqian City, Jiangsu Province, as an example, the statistical analysis of the peak displacement response of the structural isolation and superstructure and the failure probability of each structure and the reliability of the structural system are obtained by means of stochastic seismic response analysis The result shows that the dynamic reliability of the system is obviously improved when the high-rise structure adopts the composite isolation technology.