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Reduction for seisic damages and evaluation of aseismic investment for lifeline system

生命线系统地震减损及抗震投资评估

基本信息

批准号：
11650499
负责人：
FUCHIDA Kunihiko
金额：
$ 2.24万
依托单位：
Yatsushiro National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Objects of this study is to investigate the effect of the ground improvement method on the responses of liquefied surface layers and the buried pipeline for reducing damages of pipeline during strong ground motion. It is also the object of this study to develop the evaluation method for effective investment for lifeline network system during and after earthquakes.Firstly we focus on the large ground deformations like subsidence induced by soil liquefaction and build up the analytical method for seismic response of buried pipeline including its joints. We develop the 2D FE analysis program for the ground subsidence induced by liquefaction based on the potential head method. Combining the programs for the simulation of the compacting method, the liquefaction analysis and the analysis of the ground subsidence, the responses of pipeline subjected to the ground subsidence are analyzed. The numerical computational results show that the compacting improvement method is effective to reduce the responses of the surface ground layers and the pipeline.Secondly we develop the evaluating method for the optimal investment for lifeline network systems subjected to future earthquakes. In proposed method the reliability for the lifeline system is computed by Monte Carlo simulation technique, then aseisimc investment for lifeline is evaluated including the initial cost for strengthening of pipes and ground improvement, renewal cost for damaged pipes and the industrial loss. Also the cost of optional decision for fast restoration is investigated. Numerical computations are conducted for the water supply system in Kumamoto city. Result shows that the restoration strategy for performing the aseismic reinforcement in order of least costed link is effective on reducing the industrial loss and shortening of the recovery.

为减少管道在强震作用下的损伤，研究地基处理方法对液化表层和埋地管道响应的影响。提出地震中和震后生命线管网系统有效投资的评价方法也是本研究的目的。首先，针对由土壤液化引起的地面大变形，建立了埋地管道及其接头的地震反应分析方法。基于势头法，开发了液化引起地面沉降的二维有限元分析程序。结合压实模拟、液化分析和地面沉降分析程序，对管道在地面沉降作用下的响应进行了分析。数值计算结果表明，紧凑型改进方法能有效地降低地面层和管线的响应。其次，提出了生命线网络系统在未来地震作用下的最优投资评估方法。该方法利用蒙特卡罗模拟技术计算生命线系统的可靠性，然后对生命线的投资进行评估，包括管道加固和地基加固的初始成本、损坏管道的更新费和工业损失。此外，还研究了快速恢复的可选决策的代价。对熊本市的供水系统进行了数值计算。结果表明，采用按费用最小的环节进行抗震加固的恢复策略对减少工业损失、缩短恢复时间是有效的。