Simplified Framework for Blast-Risk-Based Cost-Benefit Analysis for Reinforced Concrete-Block Buildings
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 4
Abstract
Probabilistic risk assessment (PRA) is essential for evaluating different options for blast risk management. However, depending on the risk management approach being considered, a rigorous blast PRA study can be quite demanding. To expedite this process, a simplified PRA framework is proposed for reinforced concrete-block shear wall buildings, in order to determine design basis threat (DBT) fragility curves based on revised damage limit states most suitable for risk assessment. The current definitions of damage states by North American standards for blast resistant design involve global response limits—such as the support rotations of a structural element—that are relatively simple to calculate. However, such damage state descriptors can be insufficient for the cost-benefit analysis required to evaluate different risk mitigation options. As such, building on recent advances in the area of performance-based seismic design of concrete-block shear wall buildings, this study proposes revised damage states that can be associated with more useful metrics, including repair technique and building downtime. To illustrate the proposed methodology, a hypothetical shear wall building is analyzed under different DBT levels. The DBT fragility curves are obtained through Monte Carlo sampling of the random variables describing the shear wall system and are used to identify the locations that are most suitable for the erection of barriers for blast protection. The proposed PRA framework can be used to identify target performance requirements, formulated in terms of stakeholders’ tolerable probability of failure and consequent risk management, for different classes of buildings under a range of DBTs.
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Acknowledgments
This research was facilitated by a Collaborative Research and Development Grant (CRDG), funded by the Natural Sciences and Engineering Research Council of Canada (NSERC); the Canadian Concrete Masonry Producers Association (CCMPA); and the Canada Masonry Design Centre (CMDC). Additional funding was provided by McMaster University Centre for Effective Design of Structures (CEDS), funded through the Ontario Research and Development Challenge Fund (ORDCF) of the Ministry of Research and Innovation (MRI). The authors are very grateful to the staff of the Canadian Explosives Research Laboratory (CERL) who conducted the field tests and to the Canadian Forces for granting access to the test range.
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Published In
Journal of Performance of Constructed Facilities
Volume 30 • Issue 4 • August 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 30, 2014
Accepted: Mar 5, 2015
Published online: Sep 11, 2015
Discussion open until: Feb 11, 2016
Published in print: Aug 1, 2016
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