考虑场地效应的建筑群动力可靠度PDEM评估

城市建筑群的动力可靠度评估对于区域防灾减灾具有重要意义。场地效应会导致地震动的空间变异性和土-结构相互作用效应，进而显著影响区域建筑群的非线性地震响应，而确定性区域震害模拟方法仍不足以准确反映随机建筑群动力系统的整体性态。该研究引入实测地震动场和土-结构相互作用效应，发展了建筑群系统非线性地震响应时域求解方法，并遵循概率守恒假定，建立基于概率密度演化方法(PDEM)的建筑群系统动力可靠度评估框架。以某高层框架结构建筑群为例，进行了场地效应下确定性建筑群非线性地震响应分析，进而完成了随机建筑群动力可靠度评估，并评估了场地效应对建筑群系统动力可靠度影响，得到了有益结论。

DYNAMIC RELIABILITY EVALUATION OF BUILDING CLUSTER CONSIDERING SITE EFFECT BASED ON PDEM

The dynamic reliability evaluation of urban building cluster is of great significance for regional disaster prevention and mitigation. The spatial variability of ground motion and the soil-structure interaction caused by site effect have important impacts on nonlinear seismic response of building cluster. Yet existing regional earthquake disaster simulation methods based on deterministic analysis cannot reasonably reflect the overall behavior of the stochastic dynamic system of building cluster. The measured earthquake field excitations and the soil-structure interaction effect are introduced, and the time-domain solution method of the building cluster system considering the structural nonlinearity is developed in it. Further, based on the idea of probability conservation, the framework of dynamic reliability evaluation of stochastic building cluster based on the probability density evolution method is established. Taking a building cluster of high-rise frame structures as an example, the deterministic nonlinear seismic response analysis considering site effect is carried out. Next, the dynamic reliability evaluation of a stochastic building cluster is completed, and the impact of site effect on dynamic reliability of building cluster is evaluated. Finally, some useful conclusions are obtained.