基于物理机制的随机地震动场中供水管网抗震功能反应分析

城市供水管网是生命线工程的重要组成部分，由于受到工程场地地震动随机性的影响，其系统结构响应和服务功能也应呈现显著的随机性。传统的埋地管线地震反应分析既不能考虑管网拓扑结构的影响，也难以反映随机地震动的作用，同时，管线的结构响应未能落实到系统的功能性评价之上。为了解决上述三个难题，该文在工程场地地震动随机场物理模型的基础之上，通过引入埋地管网地震反应分析模型，结合概率密度演化方法，实现了具有非线性特性的埋地管网的随机地震反应分析；进而，结合管网流体的瞬变流分析理论，实现了城市供水管网的动态抗震功能反应分析，为供水管网的抗震功能可靠度研究奠定了基础。

THE SEISMIC RESPONSE OF WATER SUPPLY NETWORKS IN RANDOM SEISMIC FIELDS BASED ON PHYSICAL MECHANISMS

Water supply networks are important components of lifeline engineering. Because of the influence of random earthquake motion fields, their seismic response and function also have obvious randomness. The influence of the complicated topological structure of water supply networks cannot be considered by the traditional seismic response analysis of buried pipelines. The traditional method is also difficult to be applied to analyze the random vibration of the nonlinear system. The physical response of pipelines has not been implemented into the functional analysis of water supply networks. To solve these three problems, this paper modifies the random physical model of seismic ground motion fields on the local engineering site, introduces a finite element method of buried pipe networks, combines the probability density evolution method, and realizes the random seismic response analysis of water supply networks. Furthermore, the transient flow theory is utilized, and the random seismic function analysis of water supply networks is completed. It lays foundation for the seismic reliability evaluation of water supply networks.