【摘要】 考虑管线震害发生的随机性,利用管线在地震作用下反应的二阶矩特征信息,采用带渗漏管网抗震可靠性分析的一次二阶矩方法,以华中地区某市主干供水管网为例,进行了基本烈度条件下的可靠度分析,结果表明,在低、中烈度条件下,供水管网中各节点均处于可靠状态;在高烈度条件下,节点主要处于可靠状态,局部处于严重不可靠、甚至出现断水状态。进一步地,基于微粒群优化算法,以管网年费用折算值为优化目标、管网拓扑结构与管径为优化参数、管网节点可靠度为约束条件,建立了新的供水管网抗震设计优化模型,并将供水管网所在区域的道路信息引入管网优化设计中,提出了管网拓扑的自动生成策略,从而形成了城市供水管网系统智能化抗震设计方法。数值算例表明,基于可靠度的抗震优化设计方法为风险-投资之间的合理均衡提供了理论基础,决策者可以据此选择所期望的最佳方案。更多还原

【Abstract】 A first-order second-moment method with pipe leakage model for seismic reliability of water distribution network is proposed in the present paper,which includes the randomness inherent in the occurrence of earthquake damage of pipe network,and integrates the second-order statistics of responses of base-excited pipes.The water distribution network of an urban city in the central China is investigated for illustrative purpose.The reliability analysis of the network under basic seismic intensity is carried out.The results reveal that the nodes in the network are all in the sound state in cases of the lower and medium seismic intensity,some of them,however,are in the state of serious risk even of water break in case of the higher seismic intensity.Further,an optimal design scheme for newly-planned water distribution network is constructed using a particle swarm optimal algorithm.This scheme involves the objective function representing referred value of annual cost of network,the optimization parameters indicating the network topology and pipe diameter,and the conditional quantity with node reliability of network.A strategy of automatic generation of network is then proposed by introducing the road information of the network area into the optimal design scheme,in virtue of which the intelligent seismic design method of water distribution network is achieved.Numerical investigations show that the design method provides a foundation for the rational balance between risk and investment,and a decision-maker can thus get access to the desirable scheme.更多还原