【摘要】 以天然气管网工程造价、未来遭遇地震时管道结构的损失期望及灾后管网服务功能失效损失之和最小为目标函数,结合工程投资限制、管网系统抗震可靠度的分配以及部分管道设防的特殊要求,建立了天然气管网系统最优设防烈度决策模型。利用布尔立方体矩阵(BCM)不交化算法,作为多源多汇网络系统抗震可靠度分析工具。将差分进化算法的繁殖策略与遗传算法的交叉、变异相结合形成了一种新的混合遗传算法,用于天然气管网系统最优设防烈度的优化求解。以某天然气管网为例,在管道遭遇烈度为7度地震的情况下,进行了最优设防烈度的决策,给出了相应的计算结果。更多还原

【Abstract】 A model of optimal decision on fortification intensity for natural gas pipeline network is established,taking the sum of construction cost of natural gas pipeline network,failure loss expectation of pipeline structure in future seism and failure loss for services after the disaster as minimal objective function,combined with the restrictions of project investment,aseismatic reliability for pipeline network and special requirement of fortification for partial pipelines.The cubical algorithm for disjoint of Boolean function that is applicable for reliability calculation of network system is used as the tool of aseismatic reliability analysis for multi-source and multi-terminal network system.Combined with reproduction strategy of differential evolution algorithm with the cross and variation of genetic algorithm,a new hybrid genetic algorithm is applied to the optimization solution for fortification intensity of natural gas pipeline network.Taking a natural gas network as an example,under a condition of seven magnitude seism,a decision of optimal fortification intensity for gas pipeline is made and corresponding results are given meantime.更多还原