System-Level Seismic Risk Assessment Methodology: Application to Reinforced Masonry Buildings with Boundary Elements
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
The development of system-level seismic fragility curves, which describe the probability of building systems reaching different damage states under a given ground motion intensity level, is an essential step in preearthquake and postearthquake risk assessment and resilience quantification. Nonetheless, current methodologies for generating fragility curves do not provide clear directions regarding how to integrate the fragility of different building components within the overall building seismic risk assessment. However, several recent studies demonstrate that neglecting some of these components’ contributions may lead to an erroneous seismic risk prediction of the overall building system. Recent research has also emphasized the need to develop alternative techniques to evaluate the system-level fragility to be adopted in the next generation of seismic risk assessment and resilience quantification standards. To address these issues, this study presents a new methodology that adopts two approaches, based on either component-level seismic losses or component strengths, to evaluate the overall system-level fragility. To demonstrate its practical application, the methodology is used to generate fragility curves for a reinforced masonry shear wall building with boundary elements. In this respect, OpenSees is used to develop a three-dimensional model of the building and subsequently conduct incremental dynamic analyses (IDA) by using a suite of 44 ground motion records. On the basis of the IDA results, component-level damage states are identified and used to generate component-level and, subsequently, system-level fragility curves. The analysis results show that the two proposed approaches yield consistent results, for the studied building configuration, that fall between a lower- and an upper-bound fragility estimate of the individual building components.
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Acknowledgments
The financial support for this project was provided through the Natural Sciences and Engineering Research Council (NSERC) of Canada and the Canada Masonry Design Centre (CMDC). Support was also provided by the 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) and the McMaster Institute for Multi-hazard Systemic Risk Studies (INTERFACE).
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
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©2017 American Society of Civil Engineers.
History
Received: Jul 21, 2016
Accepted: Feb 6, 2017
Published online: May 9, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 9, 2017
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