Bridge Management, Inspection and Sustainability

Full Session with Abstracts

335554-2 - Life-Cycle Risk Assessment of Bridges Belonging to a Transportation Network under Multiple Hazards

Saturday, April 21
8:00 AM - 9:30 AM
Location: 203A

It is not feasible to design bridges that will remain intact under all hazards that might impact their lifetime performance. Hazards to bridges must be selected on the basis of their significance and must be incorporated into the risk assessment. These hazards depend on the bridge location. Based on the fragility, hazards and bridge importance, bridges that require additional attention to achieve life-cycle risk objectives must be identified. Comparing life-cycle risk among bridges belonging to a network under multiple hazards makes the determination of the priority for upgrade and/or repair actions possible. In this context, Decò and Frangopol (2011) proposed a general framework to rank the highway bridges under investigation based on quantitative time-dependent risk. Risk-based approach was also used to obtain the optimum maintenance strategy of bridges under traffic and earthquake loads (Zhu and Frangopol 2013).
This paper presents a framework for estimating the life-cycle risk of bridges in a transportation network under three types of hazards; seismic hazard, traffic load hazard, and hazard associated with airborne chlorides. The proposed framework consists of the hazard assessment, fragility assessment, consequence assessment, and life-cycle risk assessment. In the proposed framework, traffic load hazard and hazard associated with airborne chlorides are considered to affect the bridge superstructure. On the other hand, seismic hazard is considered to mainly affect the bridge substructure. To provide quantitative measures of the vulnerability of bridges or susceptibility of different levels of damage, fragility assessments are performed. Both indirect and direct losses are considered in the estimation of consequence due to the bridge damage or failure. In order to estimate the future monetary value of consequences, the annual money discount rate is taken into account. Procedures for identifying significant hazards and for assessing the risk associated with damage or collapse of bridges under multiple hazards are discussed.
KEYWORDS: life-cycle risk assessment, transportation network, seismic hazard, traffic hazard, airborne chloride.
REFERENCES
Decò, A., and Frangopol, D. M. (2011). “Risk assessment of highway bridges under multiple hazards.” J. Risk Research, 14(9), 1057-1089.
Zhu, B., and Frangopol, D. M. (2013). “Risk-Based Approach for Optimum Maintenance of Bridges under Traffic and Earthquake Loads.” J. Structural Engineering, 139(3), 422-434.

Mitsuyoshi Akiyama

Professsor
Waseda University

Mitsuyoshi Akiyama is a professor of Waseda University – Tokyo, Japan. Dr. Akiyama was Assistant and Associate Professor of Civil Engineering at Tohoku University from 1998 to 2011 before joining Waseda University in 2011. In 2001, he received a doctorate in Civil Engineering from Tohoku University. Dr. Akiyama was a Visiting Research Associate at Lehigh University from October 2008 to September 2009 in the research group of Professor Frangopol under the auspices of the Kajima Foundation. Since his stay at Lehigh University, Dr. Akiyama has collaborated with Professor Frangopol, and they have published several research papers on earthquake engineering, life-cycle structural performance, safety and reliability in structural engineering, and application of probabilistic concepts and methods to the design of civil structures. Dr. Akiyama is the recipient of several awards including the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, JSCE Yoshida Award in 1998, 2007, and 2010, JSCE Encouragement Award for Outstanding Thesis in 2007, the JCI Award for Engineering Development in 2001, and IABMAS Junior Research Prize 2016

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