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城市范围内的埋地管线,具有相似的结构属性参数,面临空间相关的地震动荷载,管线结构地震破坏失效存在相关性。提出一种考虑管线失效相关性的埋设管网地震连通可靠性随机模拟方法,以空间距离表示管线位置处地震动参数的相关系数,采用经验震害公式求解管线地震破坏概率,通过联合分布与边缘分布的关系得到管线结构失效事件的相关系数。将管线结构地震破坏事件视为相关随机变量,采用正交变换方法将相关随机变量转变为独立随机变量,进行Monte Carlo随机模拟求解管网“源-汇”点连通事件的概率。通过设定地震作用下典型算例的连通可靠性求解,验证了方法的正确性,并比较了管线失效相关性对管网地震可靠性分析结果的影响。
Buried pipelines in urban areas have similar structural property parameters, which are related to the earthquake-related load in space and failure of seismic damage to pipeline structures. This paper presents a stochastic simulation method of buried pipe network seismic reliability considering pipeline failure correlation. The spatial distance is used to show the correlation coefficient of ground motion parameters. The empirical damage formula is used to solve the seismic damage probability of pipelines. The joint distribution and edge The correlation of distribution results in the failure of the pipeline structure. Taking the earthquake damage event of pipeline structure as the relevant random variable, the orthogonal transform method is used to convert the related random variables into independent random variables, and Monte Carlo stochastic simulation is used to solve the probability of connectivity events of pipe network “source - sink”. The correctness of the method is verified by setting the connectivity reliability of typical examples under earthquake action. The influence of pipeline failure correlation on the seismic reliability analysis results of pipeline networks is also compared.