Title: Confinement Model for Axially Loaded Short Rectangular Columns Strengthened with Fiber-Reinforced Polymer Wrapping

Author(s): Omar Chaallal, Munzer Hassan, and Mohsen Shahawy

Publication: Structural Journal

Volume: 100

Issue: 2

Appears on pages(s): 215-221

Keywords: ductility; reinforced concrete; strain; strength; stress; test

DOI: 10.14359/12485

Date: 3/1/2003

Abstract:
This paper presents a confinement model describing the behavior of rectangular concrete columns retrofitted with externally bonded fiber-reinforced polymer (FRP) material and subjected to axial stress. The derivation of the proposed model is based on the findings of an extensive experimental investigation involving the testing of 90 rectangular specimens representing three cross-sectional aspect ratios, two concrete strengths, and five different numbers of FRP layers. The proposed model is trilinear both in the axial and the lateral directions and captures the key parameter observed, namely the ratio of the stiffness of the FRP jacket in the lateral direction to the axial stiffness of the column. The proposed model was found to fairly accurately describe results reported in other research studies.