Seismic Reliability Assessment of Water Supply Systems Considering Critical Paths

Chan Wook Lee,Hyuk Jae Kwon,Do Guen Yoo

doi:10.3390/app10228056

Chan Wook Lee, Hyuk Jae Kwon + Show 1 more

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https://doi.org/10.3390/app10228056

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Journal: Applied sciences	Publication Date: Nov 13, 2020
Citations: 2	License type: CC BY 4.0

Affiliation: University of Suwon, Cheongju University

Abstract

In general, studies of the seismic reliability of water supply systems through hydraulic analysis models fall into three categories: (1) model development through hydraulic analysis, (2) establishment of post-earthquake recovery strategies, and (3) robust design in preparation for earthquakes and the development of improvement techniques. In this study, with regard to the design of earthquake resistance techniques, which is the third category, a seismic reliability assessment was conducted that considers the water supply system, and a plan to maximize the seismic reliability was determined as a result of the analysis. The degree of improvement in seismic reliability was quantified for water supply systems with various sources and water supply routes via modeling of seismic protection for each water supply route. Korea’s A industrial water system, which has a history of large-scale earthquakes, was divided into nine paths, and the reliability of the water supply system and the cost of earthquake resistance were calculated and compared between the different paths. A water supply path consists of a combination of pipes of various sizes and lengths, and the amount of water to be supplied differs between paths. Quantifying the effect of the water supply system and the seismic reliability of a route is intended to provide a basic methodology for identifying the critical path that should be the target of seismic protection when money and resources available for construction are limited. This methodology was used to confirm that the reliability of the water supply, the demand for water, and the cost of earthquake resistance should be considered together to establish an earthquake resistance strategy for the critical path in a water supply system. We expect that the results of this study will be used to establish detailed strategies for preliminary reinforcement against earthquake damage based on critical paths rather than all or individual pipelines in a water supply network.

Highlights

Water supply systems (WSSs) consist of above-ground infrastructure, such as water reservoirs, pumps, valves, etc., and of a vast array of pipelines, most of which are buried underground
Since this study investigates water supply in an industrial water supply system, which suffers enormous economic loss if the water supply is stopped for even a few hours, the paths that independently supply water from the reservoir to the customer were defined as critical paths
This study performed a water supply reliability analysis based on critical path pipelines in an effort to improve the reliability of the water supply system during earthquake disasters

Summary

Introduction

Water supply systems (WSSs) consist of above-ground infrastructure, such as water reservoirs (tanks), pumps, valves, etc., and of a vast array of pipelines, most of which are buried underground. The basic function of a water supply system is to satisfy the demand for water quantity, quality and pressure by continuously supplying water from the water source to each customer’s faucet. Water supply systems are quite susceptible to seismic disasters as the relevant infrastructure is large in scale and widely distributed. Major earthquakes of magnitudes greater than 7.0, such as the Northridge quake in the United. States in 1994 and the quake in Kobe, Japan in 1995, often cause severe damage to water supply systems [1,2]. The water supply systems in areas affected by an earthquake fail due to primary damage, Appl.

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