Size Effect in FRP-Confined Concrete under Axial Compression
Publication: Journal of Composites for Construction
Volume 21, Issue 6
Abstract
The effect of size on strength of fiber-reinforced polymer (FRP)-confined cylindrical concrete columns is studied. The specimens studied are self-similar, i.e., all column dimensions as well as FRP wrap thickness are scaled proportionately with specimen size. Unlike many previous studies, a significant size effect is found in large specimens. A simple analytical model is used to explain the observed behavior. The mode of failure is seen to be critical in determining the size effect. Whereas cylinders of small size fail because of FRP rupture induced by plastic dilation in the concrete, in larger columns, failure may occur because of fracture and shear banding. A size effect is observed whenever failure is fracture dominated. The confining pressure mobilized by the FRP wrap is found to be critical. The reasons why several previous studies did not predict a size effect are investigated, and the size-effect sensitivity of different models is studied.
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Published In
Journal of Composites for Construction
Volume 21 • Issue 6 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 23, 2016
Accepted: Aug 28, 2017
Published online: Oct 5, 2017
Published in print: Dec 1, 2017
Discussion open until: Mar 5, 2018
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