Assessment of Terrorism Risk Mitigation Measures for Iconic Bridges

Sebastian Thöns, Mark G. Stewart

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This paper describes the assessment of the cost efficiency of risk mitigation measures for ter-rorist attacks with Improvised Explosive Devices (IEDs) for an iconic bridge structure. The assessment is per-formed with a decision theoretical framework building upon very recent advances in the framework of the COST Action TU1402 on Quantifying the Value of Structural Heath Monitoring. The decision scenario is formulated for a decision maker constituting an authority responsible for the societal safety of the infrastruc-ture and consequently the direct risks for the infrastructure owner and the indirect risk due to fatalities and importance of the infrastructure are considered. The mitigation strategies are classified within the decision theoretical context as protection measures, which may be implemented in the design phase of a bridge, and as control, i.e. information acquirement, strategies. The identification of efficient measures for risk mitigation is based on (1) the risk and expected cost based optimization of actions and information and their combination before implementation, (2) on quantifying and assuring significance in risk reduction and (3) on the quantifi-cation of the uncertainties associated to the implementation. These criteria ensure a transparent decision and the performance of the measures before strategy implementation. It is found that the decision is relying on the identification of the threat level and that control strategies may be in favor as their costs are adjustable. How-ever, for very high threat levels, bridge protection strategies or protection strategies in combination with con-trol strategies may be more cost efficient.
Original languageEnglish
Title of host publicationMaintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges : Proceedings of the Ninth International Conference on Bridge Maintenance, Safety and Management
Number of pages8
PublisherCRC Press
Publication date2018
ISBN (Print)9781138730458
Publication statusPublished - 2018
Event9th International Conference on Bridge Maintenance, Safety and Management - Melbourne, Australia
Duration: 9 Jul 201813 Jul 2018
Conference number: 9


Conference9th International Conference on Bridge Maintenance, Safety and Management

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