Analytical Model for Fiber-Reinforced Polymer-Jacketed Square Concrete Columns in Axial Compression

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Title: Analytical Model for Fiber-Reinforced Polymer-Jacketed Square Concrete Columns in Axial Compression

Author(s): Chung-Sheng Lee, Gilbert A. Hegemier, and Donald J. Phillippi

Publication: Structural Journal

Volume: 107

Issue: 2

Appears on pages(s): 208-217

Keywords: axial compression; fiber-reinforced polymers; hoop strain; square column; strain; stress; transverse strain.

Date: 3/1/2010

Abstract:
This paper describes the development of a new model for the response of square fiber-reinforced polymer (FRP)-jacketed concrete columns subject to axial compression. In addition to jacket membrane strain, the maximum jacket flexural strains at the centers of the sectional side and corner are approximately evaluated by assumed parabolic functions. With this novel approach, the proposed model is able to reveal the effects of sectional shape and jacket strength to the specimen performance. Including new test data on six large-scale square column specimens, validation of the proposed model is conducted via the comparison with the experimental curves of axial stress-strain, axial stress-transverse strain, and axial stress-jacket hoop strain. The results demonstrate the model accuracy on estimating the influences of corner radius and jacket properties on the axial stress-strain relation. Via the proposed model, a parametric study to exemplify these parametric effects is illustrated.