Axial Behavior and Modeling of Confined Small-, Medium-, and Large-Scale Circular Sections with Carbon Fiber-Reinforced Polymer Jackets

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Title: Axial Behavior and Modeling of Confined Small-, Medium-, and Large-Scale Circular Sections with Carbon Fiber-Reinforced Polymer Jackets

Author(s): Shawn A. Carey and Kent A. Harries

Publication: Structural Journal

Volume: 102

Issue: 4

Appears on pages(s): 596-604

Keywords: column; compression; confined concrete; dilation; Poisson’s ratio; test

Date: 7/1/2005

Abstract:
The axial stress-strain behaviors of unconfined and confined concrete differ significantly. Confined concrete shows improved compressive strength and axial strain capacity over unconfined concrete. Traditional models of confined concrete assume constant confining pressure. While these models may work well in predicting behavior of columns confined by a material behaving in a plastic manner, they do not accurately predict behavior by concrete confined by fiber-reinforced polymer (FRP) composite jackets, which are elastic to failure. An experimental program involving axial load tests of small-, medium-, and large-scale circular concrete specimens is presented to identify scale effects in the axial behavior of confined concrete. At the relatively high level of confinement provided, a scale effect is not observed as similar results were observed regardless of column size. Appropriate parameters for modeling confined concrete are presented and recommendations for the modeling and design of axially-loaded confined concrete are proposed.