New developments in seismic risk analysis for highway systems

A new methodology has been developed for probabilistic or deterministic seismic risk analysis (SRA) of highway systems. This methodology is multidisciplinary and modular, and includes new and improved procedures and models for scenario earthquakes, seismic hazards, bridge fragility, and transportation network analysis. It has been applied to actual highway systems in the United States, and is now being programmed into a publicdomain software package named REDARS 2. This paper summarizes the technical features of the SRA methodology, its application to the Shelby County, Tennessee highway system, and recent improvements to the methodology and its models.