Application of Reliability-Based Robustness Assessment of Steel Moment Resisting Frame Structures under Post-Mainshock Cascading Events
Publication: Journal of Structural Engineering
Volume 140, Issue 8
Abstract
This paper proposes a reliability-based framework for quantifying structural robustness considering the occurrence of a major earthquake (mainshock) and subsequent cascading hazard events, such as aftershocks that are triggered by the mainshock. These events can significantly increase the probability of failure of buildings, especially for structures that are damaged during the mainshock. The application of the proposed framework is exemplified through three numerical case studies. The case studies correspond to three SAC steel moment frame buildings of three, nine, and 20 stories, which were designed to pre-Northridge codes and standards. Two-dimensional nonlinear finite-element models of the buildings are developed with the Open System for Earthquake Engineering Simulation framework (OpenSees), using a finite length plastic hinge beam model and a bilinear constitutive law with deterioration, and are subjected to multiple mainshock-aftershock seismic sequences. For the three buildings analyzed herein, it is shown that the structural reliability under a single seismic event can be significantly different from that under a sequence of seismic events. The reliability based robustness indicator shows that the structural robustness is influenced by the extent to which a structure can distribute damage.
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Acknowledgments
In the development of this research work, the first and third author would like to acknowledge the support of the Portuguese Science and Technology Foundation through the fellowship SFRH/BD/77722/2011 and UNIC Research Center at the New University of Lisbon. The support of the School of Civil and Construction Engineering at Oregon State University to the second author is gratefully acknowledged. The second author would also like to thank Dr. Nicolas Luco (USGS) for the fruitful discussions on the validation of the finite element models. The first author would also like to acknowledge the support of Oregon State University during the period in which he was a visiting Ph.D. student. The support of the Nottingham Transportation Engineering Center to the third author is gratefully acknowledged. The opinions and conclusions presented in this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations.
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Information
Published In
Journal of Structural Engineering
Volume 140 • Issue 8 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 22, 2012
Accepted: Sep 6, 2013
Published online: Mar 10, 2014
Published in print: Aug 1, 2014
Discussion open until: Aug 10, 2014
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