Seismic Vulnerability and Emergency Response Analyses of UDOT Lifelines

摘要

Earthquakes damage transportation infrastructure. In addition to replacement and repair costs for damage to transportation structures, large earthquakes can increase time delays resulting from a network components loss of function. Damage to the network can severely disrupt traffic flows for several months or years. The Utah Department of Transportation (UDOT) recognizes the risks posed by these hazards and initiated this analysis. Impacts on road users can be estimated in terms of user costs from travel time delay. This report presents estimated traffic disruption user delay costs resulting from two earthquake scenarios in Utah. The VISUM traffic macro-simulation model was used to estimate the delay-based user costs. Road segments, which are vulnerable yet critical to detour traffic following an earthquake, are prioritized for rehabilitation. The calculated user costs show that the Taylorsville Scenario would incur $65 million, which is significantly lower than the Wasatch Scenario of $1.312 billion. Links that are susceptible to damage in one scenario, but critical in carrying detour traffic for the other scenario, are defined as lifelines. A shortlist of lifelines is provided for each earthquake scenario with detailed information, including names, directions, and addresses.