Effect of Seismic Load History on Deformation Limit States for Longitudinal Bar Buckling in RC Circular Columns
Publication: Journal of Structural Engineering
Volume 141, Issue 8
Abstract
This paper investigates the impact of seismic load history on longitudinal bar buckling in reinforced concrete (RC) bridge columns. Previous research has shown that reinforcing bars are prone to buckling upon reversal from tensile strain. To quantify this effect, a hybrid analysis method using both fiber and solid elements is developed and implemented to assess the impact of seismic load history on reinforcing bar buckling. Forty earthquake ground motions are utilized to conduct nonlinear time history analysis of bridge columns using a fiber-based model. The longitudinal bar strain history from the fiber-based model is then utilized as the input to the finite element model. A parametric study is conducted for the purpose of developing design equations that provide strain limits prior to the onset of bar buckling. Simple design approaches are proposed based on the design equations.
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Acknowledgments
The research described in this proposal was funded by the Alaska Department of Transportation and Public Facilities (AKDOT&PF) and the Alaska University Transportation Center (AUTC). Special mention for the support and engagement in the research by AKDOT&PF bridge engineer and project technical contact Elmer Marx is noted.
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© 2014 American Society of Civil Engineers.
History
Received: Sep 1, 2013
Accepted: Jul 14, 2014
Published online: Sep 3, 2014
Discussion open until: Feb 3, 2015
Published in print: Aug 1, 2015
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