共查询到18条相似文献，搜索用时 734 毫秒
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大型城市管网抗震可靠性分析与优化 总被引：3，自引：0，他引：3
本文提出了地震作用下供水系统的渗漏模型,发展了地震后带渗漏管网的流分析技术,结合一次二阶矩方法获得了地震后供水管网的功能可靠度。针对供燃气管网系统则提出了一类高效精确的大型网络抗震连通可靠度分析的概率解析算法———递推分解算法。以上述管网抗震可靠性分析理论为基础,分别发展了基于模拟退火算法的供水系统网络拓扑优化分析理论和基于遗传算法的供燃气网络系统拓扑优化理论。 相似文献
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在广泛收集供水管网资料的基础上,采用ＧＩＳ技术建立了大连开发区供水管网基础据数库,实现了基础资料的动态化、可视化。在此基础上,采用Ｍｏｎｔｅ Ｃａｒｌｏ技术,对开发区供水管网进行了系统的抗震可靠性研究,为开发区防震减灾对策的实用性和可操作性提供了依据。 相似文献
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如果管线抗震可靠性已知,关于整个管网的抗震可靠性,即各点在指定烈度水平下相对于某个震害挡次仍可得到供水的概率,前人的工作只做到对节点进行估计。由于管线内点上存在着无以数计的用户或称次级管网,因此,我们必须研究抗震可靠性场分布。这样做不仅可以对父子型管网进行解耦分析,以利于实际课题在时空双向上的分割与联系,而且也可以成为分析兄弟型管网的一种技巧。前者意义自明,对于后者本文以冕宁县城给水管网为例进行分析研究。 相似文献
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基于GIS的地下管网抗震分析系统 总被引：2，自引：0，他引：2
本文提供了一个地下管道震害快速预测方法,给出了供水管网和供气管网地震影响范围判定分析方法以及关键环节判定方法,完成了一个基于Arc View GIS的多功能的地下管网抗震分析系统的研制。 相似文献
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为量化和提高城市供水管网抗震韧性,提出了一种供水管网抗震韧性分析框架和一种基于重要度的恢复策略。首先建立了供水管网的4种常见组件(水塔、泵站、水厂和管道)的功能分析方法,获得其基于需求的抗震韧性指标;然后介绍了4种组件的易损性模型,确定各组件在地震下的损伤状态,并提出了一种基于动态重要度的方法来给出供水管网震后恢复策略。将该方法应用于一中型管网,对基于动态重要度的方法、基于静态重要度的方法和两种经验方法的抗震韧性进行比较。结果表明,基于动态重要度的方法可以显著提高供水管网的抗震韧性。 相似文献
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An approach to analyze the seismic reliability of water distribution networks by combining a hydraulic analysis with a first-order reliability method （FORM）, is proposed in this paper. The hydraulic analysis method for normal conditions is modified to accommodate the special conditions necessary to perform a seismic hydraulic analysis. In order to calculate the leakage area and leaking flow of the pipelines in the hydraulic analysis method, a new leakage model established from the seismic response analysis of buried pipelines is presented. To validate the proposed approach, a network with 17 nodes and 24 pipelines is investigated in detail. The approach is also applied to an actual project consisting of 463 nodes and 767 pipelines. The results show that the proposed approach achieves satisfactory results in analyzing the seismic reliability of large-scale water distribution networks. 相似文献
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Lifeline systems, such as water distribution and gas supply networks, usually cover large areas. For these systems, seismic design is always a difficult problem because of the complexity of large‐scale networks. In this paper, a topology optimization technology for lifeline networks is established. Firstly, in order to speed up the convergence of optimization process, an element investment importance analysis is carried out to evaluate the importance of components to the lifeline network. Then a topology optimization model is established. The aim of the model is to find the least‐cost network topology while the seismic reliability between the sources and each terminal satisfies prescribed reliability constraints. For this optimization problem, a genetic algorithm, which takes network topologies as the individuals of its population, is used to search for the optimal solutions by suitable operators, including selection, crossover and mutation operators. The capacity of the proposed algorithm is illustrated by its applications to a simple example network consisting of 10 nodes and an actual network with 391 nodes located in a large city of China. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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四川省分布着金沙江、雅砻江、大渡河、岷江、沱江、涪江、嘉陵江和渠江等8大水系。由于金沙江、雅砻江和大渡河等流域的水电站基本处于高海拔、高地震烈度、高边坡和地质条件复杂的高山峡谷中,据相关法律法规,有必要加强水电站地震监测。经30多年的努力,8大水系共计16个电站建成专用地震监测台网并投入运行,其余56座电站的地震监测工作推进较缓,文中对四川省主要水系流域地震监测情况予以详细阐述,希望为地震监测工作推进缓慢的流域提供参考,促进地震监测工作的顺利实施。 相似文献
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An improved recursive decomposition algorithm for reliability evaluation of lifeline networks 总被引：1，自引：1，他引：0
The seismic reliability evaluation of lifeline networks has received considerable attention and been widely studied.In this paper,on the basis of an original recursive decomposition algorithm,an improved analytical approach to evaluate the seismic reliability of large lifeline systems is presented.The proposed algorithm takes the shortest path from the source to the sink of a network as decomposition policy.Using the Boolean laws of set operation and the probabilistic operation principal,a recursive deco... 相似文献
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Decomposition algorithms for system reliability estimation with applications to interdependent lifeline networks 
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下载免费PDF全文 Reliability and risk assessment of lifeline systems call for efficient methods that integrate hazard and interdependencies. Such methods are computationally challenged when the probabilistic response of systems is tied to multiple events, as performance quantification requires a large catalog of ground motions. Available methods to address this issue use catalog reductions and importance sampling. However, besides comparisons against baseline Monte Carlo trials in select cases, there is no guarantee that such methods will perform or scale well in practice. This paper proposes a new efficient method for reliability assessment of interdependent lifeline systems, termed RAILS, that considers systemic performance and is particularly effective when dealing with large catalogs of events. RAILS uses the state‐space partition method to estimate systemic reliability with theoretical bounds and, for the first time, supports cyclic interdependencies among lifeline systems. Recycling computations across an entire seismic catalog with RAILS considerably reduces the number of system performance evaluations in seismic performance studies. Also, when performance estimate bounds are not tight, we adopt an importance and stratified sampling method that in our computational experiments is various orders of magnitude more efficient than crude Monte Carlo. We assess the efficiency of RAILS using synthetic networks and illustrate its application to quantify the seismic risk of realistic yet streamlined systems hypothetically located in the San Francisco Bay Region. 相似文献
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根据概率可靠性理论,计算了地震作用下地下直埋管道的各个震害等级的概率值。假定在一段管子中,其破坏为泊松公布,求得这段管道供水的可靠性,最后用并联和串联分析法,得出整个供水管网的供水可靠性。通过实际计算,结果较理想。 相似文献
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对内蒙古地震台网和呼和浩特遥测地震台网测定的近震震级ＭＬ的偏差进行了统计研究，结果表明；两者之间的ＭＬ震级标度基本一致。由于ＭＬ震级公式本身的不均匀性，对于网外地震，遥测台网ＭＬ震级需加适量校正值。 相似文献