Resilience assessment and optimization method of city road network in the post-earthquake emergency period

The post-earthquake emergency period, which is a sensitive time segment just after an event, mainly focuses on saving life and restoring social order. To improve the seismic resilience of city road networks, a resilience evaluation method used in the post-earthquake emergency period is proposed. The road seismic damage index of a city road network can consider the influence of roads, bridges and buildings along the roads, etc. on road capacity after an earthquake. A function index for a city road network is developed, which reflects the connectivity, redundancy, traffic demand and traffic function of the network. An optimization model for improving the road repair order in the post-earthquake emergency period is also developed according to the resilience evaluation, to enable decision support for city emergency management and achieve the best seismic resilience of the city road network. The optimization model is applied to a city road network and the results illustrate the feasibility of the resilience evaluation and optimization method for a city road network in the post-earthquake emergency period.