Experimental Investigation of Axial Compressive Behavior of Large-Scale Circular Concrete Columns Confined by Prestressed CFRP Strips
Publication: Journal of Structural Engineering
Volume 145, Issue 8
Abstract
One important application of fiber-reinforced polymer (FRP) composites is providing confinement for concrete columns. Utilization of prestressed FRP sheets can relieve stress hysteresis through active confinement. And most investigations focus on small size concrete columns, but it is unclear whether the models that developed from small-scale cylinders are appropriate for large-scale columns due to the size effect. This paper evaluated the axial compressive behavior of large-scale circular concrete columns confined by lateral prestressed carbon fiber-reinforced polymer (CFRP) strips. A total of 10 large-scale columns were tested, and the size of the specimen was 800 mm in diameter and 2,500 mm high. These specimens included one unconfined column, seven columns actively confined by prestressed CFRP strips, and two columns passively confined by externally bonded CFRP strips. Including different strengthening methods, the influences of various prestress levels and different strip spacing were considered in this experiment. The test results indicated that, considering reinforcement effectiveness, axial load-bearing capacity and ductility of large-scale columns confined with prestressed CFRP strips were improved significantly. A polynomial stress-strain model is proposed based on the experimental results, and this model could be used to estimate the axial compressive behavior of large-scale concrete columns confined by prestressed CFRP strips.
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Acknowledgments
The authors are grateful for the financial support received from the National Natural Science Foundation of China (Project Nos. 51678039 and 51478033) and Structural Laboratory in Civil Engineering at Beijing University of Technology, China.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 21, 2018
Accepted: Dec 7, 2018
Published online: May 17, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 17, 2019
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