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Taipei Water Department

Research Report

Seismic Assessment of Damages to Water Pipeline Network of Taipei Area and Preparation for Response due to possible M7

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Taipei is the political and economic center of Taiwan. It is inevitably required to hope for the best yet prepare for the worst regarding hazard mitigation. The nearby Sanchiao Fault, classified as a type II active fault by Central Geological Survey, MOEA, due to low activity, remains a major seismic concern to the City. Recently, new geological evidences indicate that its length might extend further to the off shore for quite a distance. As a result, its seismic hazard potential could be higher than previously expected. In view of this, Taipei Water Department (TWD) launched a research project to investigate the likely consequence to its pipeline network under a postulated M7.1 event triggered by the Sanchiao Fault. It was found through scenario simulation that ground failures in terms of both fault rupturing and soil liquefaction may contribute numerous pipe damages. The scale of disaster, i.e. the number and distribution of pipe damages including pipe breaks and leakages, was estimated. The manpower and materials required for the recovery of the pipeline network were examined. A comprehensive plan with countermeasures to confront such catastrophic situation was prepared.
Furthermore, the seismic assessment of Yungfu Bridge, one of the four water pipe bridges that play pivotal roles in the functionality of TWD water system, was performed. Linear elastic static and dynamic analyses, nonlinear static pushover analyses, and nonlinear dynamic time history analyses were applied to examine its seismic capacity under various seismic conditions. It is proven capable of sustaining moderate seismic load without being inelastically deformed. However, according to nonlinear pushover analysis, its performance in longitudinal direction fails to meet the seismic demand for important bridges under design earthquakes, and should be retrofitted.