CFRP-Confined Square RC Columns. II: Cyclic Axial Compression Stress-Strain Model
Publication: Journal of Composites for Construction
Volume 16, Issue 2
Abstract
For the seismic design of fiber reinforcement polymer (FRP) confined reinforced concrete (RC) columns, the development of an accurate axial stress-strain model that considers cyclic compression is necessary. In light of such a demand, this paper presents a cyclic axial stress-strain model for FRP-confined RC square columns. The model is informed from physical observations and test measurements obtained from an experimental investigation reported in the companion paper, in which FRP-confined square unreinforced and reinforced concrete columns of larger size under varying cyclic axial compression patterns were tested. In the current paper, the proposed stress-strain model is presented and it consists of three main components, namely (1) a monotonic stress-strain model to describe the envelope curve, (2) a polynomial expression for the unloading path, and (3) a straight line for the reloading path. The influence of internal longitudinal and hoop steel reinforcement is also considered in the proposed model, in addition to their influence on the ultimate stress and strain. The accuracy of the model is finally validated with an experimental database compiled of tests reported in the companion paper and other relevant tests extracted from the open literature
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Acknowledgments
This first author acknowledges the support provided by the National Natural Science Foundation of China (Grant Nos. 51078109 and 50408010) and also by the Heilongjiang Provincial Foundation for Returned Overseas Scholars (Grant No. LC2011C23).
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Information & Authors
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Published In
Journal of Composites for Construction
Volume 16 • Issue 2 • April 2012
Pages: 161 - 170
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Feb 28, 2011
Accepted: Aug 1, 2011
Published online: Aug 3, 2011
Published in print: Apr 1, 2012
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