城市供水管网抗震功能可靠度分析

介绍了供水系统功能分析中的经验渗漏模型,在此基础上给出了一个新的改进算法。将建议模型与供水系统水力分析方法相结合,并引入一般结构分析中的一次二阶矩方法,提出了一类求解供水网络节点及系统功能可靠度的方法。对一典型供水管网进行了流分析,将建议模型计算所得结果与常规渗漏模型进行了比较,结果说明建议模型可行,计算结果合理可信。

Seismic Reliability Analysis of Urban Water Supply System

As an essential component of lifeline systems,water supply system plays a more and more important role in modern city.Unfortunately,it suffered extensive damage during many previous earthquakes.Therefore,study on the seismic reliability of water distribution system is an important topic in the earthquake engineering field.The seismic hydraulic analysis of the urban water supply system can serve the economic loss forecast and disaster control after earthquake.In this paper,a hydraulic analysis program of the water supply system in an earthquake is developed based upon the hydraulic analysis method in a normal state.As a significant factor affecting the result of the hydraulic analysis,the pipe leakage area is used to describe the damaged state of a buried pipe in the earthquake.After introducing the experiential leakage model,Chinese model,which was often used in the capability analysis,a new leakage model based on seismic response analysis of buried pipeline is presented in this article.Apply this model into the analysis of the water supply system and combine it with the first order second moment(FORM) reliability method,a new method of analyzing the capability reliability of a water supply system is suggested.In order to validate the proposed method,a network with 17 nodes and 24 pipelines is studied to compare the difference between the new model and the traditional experiential Chinese model.The results show that the Chinese model which comes from the leakage flux under normal state of water supply system will overestimate the capacity reliability under earthquake.On the other hand,the algorithm with the new leakage model presented in this paper can make the seismic hydraulic analysis efficient and accurate.The results proved that the method put forward in this paper is qualified for analyzing the seismic reliability of water supply system.