Constitutive Model of Concrete Simultaneously Confined by FRP and Steel for Finite-Element Analysis of FRP-Confined RC Columns
Publication: Journal of Composites for Construction
Volume 22, Issue 6
Abstract
This paper presents a confined concrete material constitutive model for use in finite-element analysis, which is able to model accurately the combined confinement effect of fiber-reinforced polymers (FRP) and internal steel reinforcement on the structural monotonic, cyclic, and/or dynamic response of reinforced concrete (RC) columns confined with externally wrapped FRP. The proposed material constitutive model for FRP-and-steel confined concrete explicitly models the simultaneous confinement produced by FRP and steel on the core concrete to predict the combined effect on the structural response of circular RC columns. This modified material model is combined with a force-based frame element to predict numerically the load-carrying capacity of FRP-confined RC columns subjected to different loading conditions. Numerical simulations are compared to experimental test data available in the literature and published by different authors. The numerically simulated responses agree very well with the corresponding experimental results. The proposed model is found to predict the ultimate load for FRP-confined RC circular columns with better accuracy than models that do not consider the simultaneous confinement effects on FRP and steel, particularly for columns subjected to concentric axial loads.
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Acknowledgments
The authors gratefully acknowledge partial support of this research by the Louisiana Board of Regents (LA BoR) through the Louisiana Board of Regents Research and Development Program, Research Competitiveness (RCS) subprogram, under Award No. LESQSF (2010-13)-RD-A-01; the National Science Foundation through award CMMI #1537078; the Brazilian National Council for Scientific and Technological Development (CNPq—Brazil); and the LASPAU-LSU Fulbright Award. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the writers and do not necessarily reflect the views of the sponsors.
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Journal of Composites for Construction
Volume 22 • Issue 6 • December 2018
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©2018 American Society of Civil Engineers.
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Received: Mar 5, 2018
Accepted: Jun 22, 2018
Published online: Oct 15, 2018
Published in print: Dec 1, 2018
Discussion open until: Mar 15, 2019
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