Axial Impact Behavior of FRP-Confined Concrete Stub Columns with Square and Circular Cross Section
Publication: Journal of Composites for Construction
Volume 24, Issue 3
Abstract
Fiber-reinforced polymer (FRP) wrapping has been shown to be very effective in enhancing the static loading capacity of reinforced concrete columns. However, the impact performance of FRP-confined square concrete columns is still an unexplored field of study. This paper reports experimental results of relatively large-scale FRP-confined square and circular concrete columns subjected to axial impact, using a large-capacity drop-hammer machine. The main parameters include type of FRP, number of FRP layers, and the corner-rounding radius ratio. The results indicate that the failure modes of square columns are strongly influenced by the corner-rounding radius ratio. As expected, the rupture locations of FRP are all in the corner region, where the strain distribution usually shows stress concentration. It is revealed that the actual rupture strain of FRP under impact is significantly lower than that under static load. Columns wrapped in glass FRP (GFRP) and basalt FRP (BFRP) performed better under impact loading than did columns wrapped with carbon FRP (CFRP). Compared with static loading results, the axial stress–strain response under impact exhibits a more complex behavior. Based on the experimental results, an equation is proposed for predicting the FRP confinement effect on concrete for circular and square cross-section columns under impact.
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Acknowledgments
The experimental work of this research was conducted at the China Ministry of Education Key Laboratory of Building Safety and Efficiency at Hunan University, with the support of the National Natural Science Foundation National Project (51438010, 51678228) and the Distinguished Professorship provided by the Zhejiang University–University of Illinois Institute, Zhejiang University.
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Journal of Composites for Construction
Volume 24 • Issue 3 • June 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: May 4, 2019
Accepted: Oct 31, 2019
Published online: Apr 8, 2020
Published in print: Jun 1, 2020
Discussion open until: Sep 8, 2020
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