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Structural Engineering and Mechanics
  Volume 73, Number 3, February10 2020 , pages 339-351

A comprehensive approach to flow-based seismic risk analysis of water transmission network
Sungsik Yoon, Young-Joo Lee and Hyung-Jo Jung

    Earthquakes are natural disasters that cause serious social disruptions and economic losses. In particular, they have a significant impact on critical lifeline infrastructure such as urban water transmission networks. Therefore, it is important to predict network performance and provide an alternative that minimizes the damage by considering the factors affecting lifeline structures. This paper proposes a probabilistic reliability approach for post-hazard flow analysis of a water transmission network according to earthquake magnitude, pipeline deterioration, and interdependency between pumping plants and 154 kV substations. The model is composed of the following three phases: (1) generation of input ground motion considering spatial correlation, (2) updating the revised nodal demands, and (3) calculation of available nodal demands. Accordingly, a computer code was developed to perform the hydraulic analysis and numerical modelling of water facilities. For numerical simulation, an actual water transmission network was considered and the epicenter was determined from historical earthquake data. To evaluate the network performance, flow-based performance indicators such as system serviceability, nodal serviceability, and mean normal status rate were introduced. The results from the proposed approach quantitatively show that the water network is significantly affected by not only the magnitude of the earthquake but the interdependency and pipeline deterioration.
Key Words
    water transmission network; flow-based network simulation; seismic risk analysis; water network interdependency; buried pipeline deterioration
Sungsik Yoon, Hyung-Jo Jung: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291
Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
Young-Joo Lee: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil,
Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea

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