Connectivity-based Seismic Response Analysis of Water Transmission Networks

Abstract

Recent frequent earthquakes have caused serious damage to water supply structures, significantly affecting the drinking water supply of local residents. In particular, because water supply structures are extensively buried underground, prediction of their deteriorated performance against external disturbances is crucial for maintenance purpose. Therefore, this study aims to evaluate the degraded seismic performance of the water transmission network based on connectivity-based network analysis against seismic conditions. The proposed methodology consists of i) network map reconstruction using a graph theory, ii) ground motion generation considering the uncertainty of seismic motion, and iii) connectivity verification between source and sink nodes. To demonstrate the proposed methodology, the network topology was reconstructed by adopting the water transmission network located in A-city, and the seismic performance of the target network was evaluated considering the epicenter of the historical earthquakes. As a result of numerical analysis, the seismic response of the water transmission network showed the highest network connectivity when the water was supplied from node 62, and water was stably secured at node 107 under different earthquake magnitudes.