Study of Seismic Design of Lifeline System Considering System Performance after an Earthquake

点击翻译按钮获取中文摘要

This study deals with a system performance of water supply system after an earthquake and prioritization of the retrofit. After the 1995 Hyogoken Nambu (Kobe) earthquake, the water supply system of Kobe City was completely disrupted and its principal functions were lost. It took about three months for complete recovery of water supply. Since it is not realistic that the earthquake damages were perfectly prevented against very rare but great earthquake like the 1995 Kobe earthquake, performance based design should be introduced into the lifeline system. Moreover, the retrofit prioritization is required in the system strengthening From the point of system performance because of the enormous piping length.First, a flow analysis of water supply pipelines was conducted in order to estimate under water supply points of a network after a scenario earthquake. The water supply pipeline network of Kanazawa City in Japan was adopted as a case study in this study. An effect of suspension and under supply of water on a civil society after an earthquake was estimated from the point of system performance. Based on the data in the 1995 Kobe earthquake, the relation between the day after the event and main purpose of water was shown and the minimum objective of water supply volume was given. Then a loss for water shortage was defined to evaluate the degree of effects of water shortage on a civic life. A loss of water shortage, which was a difference between supplied water volume and the minimum objective was evaluated by the value of money. The strengthening of water supply pipelines was studied to reduce the loss for water shortage due to the suspension and under supply of water after an earthquake. The results revealed that the total loss for water shortage seems to be one of the indices for evaluation of retrofit prioritization.