Axially Restrained Beam-Column with Initial Imperfections and Nonlinear End Connections Subject to High Temperatures
Publication: Journal of Engineering Mechanics
Volume 140, Issue 4
Abstract
A nonlinear formulation capable of accurately and efficiently predicting the nonlinear response of an axially restrained prismatic beam-column with initial geometric imperfections (i.e., initial curvature and connection eccentricities) and nonlinear temperature-dependent end connections under elevated temperatures is presented. The proposed model includes the effects of (1) an arbitrary thermal gradient along both the span and cross section of the member and (2) the nonlinear behavior and any stiffness and strength degradations of the beam-column material. However, high-temperature creep and shear deflection effects are not taken into consideration. The proposed model is generic allowing the implementation of any thermal regime and the use of any stress-strain-temperature curves of the beam-column material. The stress-strain-temperature curves of the material can be either theoretical or experimental providing a more realistic approach to the structural response of beam-columns subjected to different fire conditions. Two comprehensive examples are presented and discussed in detail showing the effectiveness and accuracy of the proposed iterative method on the nonlinear large-deflection behavior of slender prismatic beam-columns under high temperatures, including the combined effects of initial imperfections, end restraints, and nonlinear end connections.
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Acknowledgments
The authors thank COLCIENCIAS (COLOMBIA) and the Civil Engineering Department, School of Mines of the National University of Colombia at Medellín for providing financial support.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 140 • Issue 4 • April 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 8, 2013
Accepted: Sep 11, 2013
Published online: Sep 13, 2013
Published in print: Apr 1, 2014
Discussion open until: Jun 2, 2014
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