隔震结构"小震不坏"的动力可靠度分析

本文探讨叠层橡胶隔震体系在“小震不坏”条件下的动力可靠度分析。基于等效线性化的隔震工程设计参数，建立非比例阻尼隔震结构模型。采用双过滤白噪声功率谱模型描述地震动，并用林家浩虚拟激励法进行随机响应分析。以各层的最大层间位移响应作为控制指标，取结构的弹性位移限值作为位移极限值，建立功能状态方程。根据一次二阶矩方法，用串联模式计算体系的总体可靠度。文末选用了一个7层隔震框架作为数值算例，探讨了隔震阻尼、寒冷环境、节点构造误差所引起的隔震层刚度上升，以及场地土类别等对体系动力可靠性的影响。

Dynamic reliability of isolated structure for "undamaged under minor earthquake"

This paper investigates the dynamic reliability of laminated rubber bearing isolated structure under minor earthquake. The structure is modeled as non-proportionally damped system based on equivalent linearized parameters which is used for practical design. The seismic ground motion is assumed to be double filtered white noise, and pseudo excitation approach is employed to calculate the random response. The maximum interstory drift is adopted as the performance index of the superstructure, and elastic limit of interstory displacement is used as the ultimate value to establish the performance equation. The failure probability is calculated using first-order reliability method (FORM), and the total reliability of structure is derived by regarding the stories to be of series relation. A 7-story isolated RC frame is used as numerical example, and the effect of isolation damping, cold environment, inaccuracy of isolation detailing and soil profile on the system reliability is discussed.