Effect of Predamage on the Stress-Strain Relationship of Confined Concrete under Monotonic Loading
Publication: Journal of Structural Engineering
Volume 140, Issue 12
Abstract
Jacketing concrete columns with steel or fiber-reinforced polymer (FRP) has been identified as a highly effective way of restoring and enhancing the strength and ductility of columns damaged by catastrophic events such as earthquakes, blasts, and vehicle impact. However, a stress-strain relationship for damaged and subsequently repaired concrete is not available for design of the repair works. An extensive experimental and analytical investigation was undertaken in this work to study the mechanical properties of repaired concrete columns. Tests were conducted on 102 concrete cylinders involving variations of damage degree, concrete grade, and confinement pressure. The effect of damage on the compressive strength, strain capacity, initial elastic modulus, and strain-hardening modulus of repaired concrete is quantified in terms of a damage index. A stress-strain model is developed for the design of structural repair works. Evaluation of the test data also exhibits that the classic model of confined concrete proposed by a previous study and the classic internal friction theory are qualitatively applicable to failure of concrete materials not only in its original form, but also in the heavily disturbed state. The Hoek-Brown failure criterion is unconservative for heavily damaged concrete.
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Acknowledgments
The first author would like to acknowledge that the undergraduate students Lip Chi Chung and Hui Chi Hang undertook the tests as their final year projects under the guidance of the second author. The third author undertook the model regression works that were initially tried by the fourth author. The work described in this paper was fully supported by a grant from the City University of Hong Kong (Project No. 6351015).
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Published In
Journal of Structural Engineering
Volume 140 • Issue 12 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 18, 2013
Accepted: Nov 26, 2013
Published online: Jun 4, 2014
Discussion open until: Nov 4, 2014
Published in print: Dec 1, 2014
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