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建立了层间隔震结构的动力分析模型,采用低频模拟和高频模拟方法相结合的综合功率谱模型模拟地震地面运动功率谱,运用虚拟激励法进行层间隔震结构的随机地震反应进行了分析,得到了隔震层及其他各层层间响应峰值的统计量。以隔震层和其他各层最大层间位移作为控制指标,建立极限状态方程,采用一次二阶矩方法,用MATLAB编程计算其失效概率,并用串联模式计算体系的整体失效概率。以江苏省高烈度区宿迁市的某20层的框剪结构为例,利用上述方法计算了层间隔震结构的位移随机响应和整体失效概率,并与非隔震结构进行了比较。结果表明,层间隔震结构上部各层失效概率较非隔震结构大大减小,且各层失效概率分布比较稳定。隔震结构整体的失效概率要远小于非隔震结构,层间隔震结构的动力可靠度显著增加。
The dynamic analysis model of the layered seismic isolation structure is established. The power spectrum of ground motion is simulated by the integrated power spectral model combined with the low-frequency and high-frequency simulation methods. The random seismic response of the layered seismic isolation structure is analyzed by the virtual excitation method. The statistics of the peak response between the isolation layer and other layers are obtained. Taking the maximum interlayer displacement between seismic isolation layer and other layers as the control index, the limit state equation is established. The first order second moment method is used to calculate the failure probability with MATLAB and the overall failure probability of the system is calculated by series mode. Taking a 20-story frame-shear structure in Suqian City, a high-intensity area of Jiangsu Province, as an example, the stochastic displacement response and the overall failure probability of a layered seismic isolation structure are calculated and compared with those of non-isolated structures. The results show that the probability of failure at upper layers of seismic isolation structure is much lower than that of non-seismic isolation structures, and the failure probability distribution of each layer is relatively stable. The overall failure probability of the isolated structure is far less than that of the non-isolated structure, and the dynamic reliability of the layered separated structure increases significantly.