Risk assessment of transportation systems with network functionality losses

• Published in: Structure and infrastructure engineering Vol. 6; no. 1-2; pp. 111 - 125
• Main Authors: Stergiou, Evangelos C., Kiremidjian, Anne S.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 01.02.2010
• Subjects: direct loss; functional loss; network systems; risk assessment; spatially distributed systems; INE, USA, California, San Francisco Bay
• ISSN: 1573-2479; 1744-8980
• DOI: 10.1080/15732470802663839

The objective of this paper is to present a seismic risk assessment model for transportation network systems that includes the hazard exposure from ground shaking, liquefaction and landslides. Previous studies consider the risk from physical damage and loss of functionality of the network system due to a single scenario earthquake. The current paper extends these methods to include all possible events for complete risk curve estimation. Functionality loss is presented in terms of lack of connectivity, reduction in traffic flow and increase in travel time or length. The risk is provided in terms of the annual rate of exceeding monetary loss. The model is applied to the transportation network of five counties in the San Francisco Bay Area. The annual risk curve is generated based on the rate of occurrence of possible events and their corresponding loss. The loss due to commuter traffic delay is found to be higher than that from bridges damage.