Effects on the Plastic Region of RC Bridge Columns: Closed-Form Solution
Publication: Journal of Structural Engineering
Volume 142, Issue 11
Abstract
A closed-form solution to the effect of member deformations () on the inelastic response of RC bridge columns is presented. The formulation is based on an equivalent elastic structure with a constant flexural stiffness for the cracked RC section that enables the solution to be independent of the structural global displacements (). The ability of the proposed solution for predicting moment, curvature, and displacement profiles in RC columns is demonstrated and verified against experimental data from four half-scale test columns. The closed-form solution led to the identification of a dimensionless slenderness parameter that measures the susceptibility of RC columns to second-order effects. Simplified formulas for the spread of the plastic region () and the magnitude of moment are proposed for use in seismic design. The design formulas, derived from the mechanics-based solution, are shown to be able to predict experimental data on the effects with satisfactory accuracy.
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Acknowledgments
The research described in this paper was carried out with funding from the U.S. National Science Foundation under grant numbers CMMI-1000549 and CMMI-1000797. The authors thank Professors Michael Berry, Dawn Lehman, and Michael Eberhard for sharing test data for reported column B0815.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 5, 2015
Accepted: Apr 29, 2016
Published online: Jun 27, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 27, 2016
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