Flow-based Seismic-resilience Estimation of Urban-bridge Transportation Networks

Abstract

The Gyeongju earthquake (magnitude 5.8) and Pohang earthquake (magnitude 5.4), which occurred recently in South Korea, induced profound social confusion. In particular, severe damage to critical infrastructures, such as bridges, water, and power-supply facilities, not only directly damages the structures but also indirectly affects the local residents and community. In this study, a comprehensive methodology was proposed to evaluate the seismic resilience of urban-bridge transportation networks based on flow analysis. To demonstrate the proposed methodology, an actual bridge transportation network in Gyeongju, South Korea was adopted, and a network map was reconstructed based on a geographic information system. Numerical analysis show that the area of the seismic-resilience curve of the bridge transportation network increases with the earthquake magnitude. Moreover, the required travel time decreases as the bridge structure is restored.