Parametric Study of RC Bridge Columns Actively Confined with Shape Memory Alloy Spirals under Lateral Cyclic Loading
Publication: Journal of Bridge Engineering
Volume 19, Issue 10
Abstract
This paper focuses on studying numerically the cyclic behavior of RC bridge columns that are seismically retrofitted using thermally prestressed shape memory alloy (SMA) spirals, an innovative active confinement technique that has been validated experimentally. A fiber-based model of the actively confined column is first developed and is validated using experimental results. Comparing the numerical and experimental behaviors shows that the developed model is satisfactorily capable of describing the hysteretic behavior and damage states of the experimental column. The developed model is then used in a parametric study to investigate the effects of the interactions between active confinement pressure and other important design and geometrical parameters of the columns, such as axial load, volumetric ratio of longitudinal reinforcement, and slenderness ratio. The results of this parametric study provide practical information that is useful in setting a design guideline for retrofitted bridge columns using the newly developed SMA active confinement technique.
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Information
Published In
Journal of Bridge Engineering
Volume 19 • Issue 10 • October 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 16, 2013
Accepted: Feb 3, 2014
Published online: Mar 21, 2014
Discussion open until: Aug 21, 2014
Published in print: Oct 1, 2014
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