Axial Load Behavior of Large-Scale Columns Confined with Fiber-Reinforced Polymer Composites


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Title: Axial Load Behavior of Large-Scale Columns Confined with Fiber-Reinforced Polymer Composites

Author(s): S. Matthys, H. Toutanji, K. Audenaert, and L. Taerwe

Publication: Structural Journal

Volume: 102

Issue: 2

Appears on pages(s): 258-267

Keywords: column; fiber-reinforced concrete; load; test

Date: 3/1/2005

The behavior of fiber-reinforced polymer (FRP)-confined concrete under axial loads has been extensively studied. However, most of the existing models have been concerned with small-size cylinders. This paper presents the experimental and analytical results of axially loaded large-scale columns confined with FRP wrapping reinforcement. The effective circumferential FRP failure strain and the effect of increasing confining action were investigated. Different models for the prediction of the ultimate strength of FRP-confined concrete have been reviewed. One of the main objectives of this study was to compare the different existing compressive strength models to the results presented in this study. A revision of an existing model developed previously by the second author is presented. The revised model addresses the effective FRP failure strain that is attributed to localized stress concentrations near failure due to nonhomogenous deformations of the damaged concrete. A comparison between the experimental results and those predicted by the existing models is presented. Although the available models were developed based on small-size cylinders, some seem to predict the ultimate strength of large-scale columns fairly accurately.