Seismic Damage Assessment of SMA-Retrofitted Multiple-Frame Bridge Subjected to Strong Main Shock–Aftershock Excitations
Publication: Journal of Bridge Engineering
Volume 23, Issue 1
Abstract
This study numerically examined the seismic performance of a multiple-frame bridge retrofitted with external shape memory alloy (SMA) spirals actively confining the plastic hinges of the bridge piers when subjected to strong main shock–aftershock sequences. A numerical model of the bridge, including abutments and expansion joints, was developed and used in the study. The model accounts for the spread of plasticity along the piers and the constitutive behavior of SMA-confined concrete. A suite of main shock–aftershock records with various characteristics was used in a series of nonlinear dynamic analyses performed on the as-built and retrofitted bridge using different levels of SMA confinement. The seismic performance of the bridge was assessed by monitoring damage states at the local and global levels. The results show that active confinement provided by SMA spirals is quite effective in preventing concrete crushing under strong sequential seismic events and that strength degradation in concrete greatly reduces as the level of confinement increases. SMA confinement can also contribute to reducing fatigue damage in reinforcing bars and residual hinge openings at the bridge joints.
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Acknowledgments
This research was funded by the National Science Foundation (NSF) through its Faculty Early Career Development (CAREER) program under Award No. 1055640, and the authors are grateful for the support.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 23 • Issue 1 • January 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Nov 3, 2016
Accepted: Jul 18, 2017
Published online: Oct 25, 2017
Published in print: Jan 1, 2018
Discussion open until: Mar 25, 2018
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