Abstract
Fiber-reinforced polymer (FRP) composite jackets can be used to retrofit existing reinforced concrete columns and structural systems. This article presents a damage-based stress-strain model applicable for both bonded or nonbonded FRP confined concrete. The model was developed for predicting the compressive behavior of circular FRP-confined concrete members and is based on a variable of Poisson's ratio formulation. The general concepts of elasticity, damage mechanics, and plasticity theory are included in this stress-strain model that considers the macrostructural effects of the increase in internal damage into a simple mechanics model. Poisson's ratios used in the model are a function of the mechanical properties of the unconfined concrete and confining FRP jacket, and the extent of internal damage in the confined concrete core. The authors conclude that the proposed damage-based stress-strain model governs the behavior of circular FRP-confined concrete throughout its compressive behavior and can be easily implemented into a spreadsheet, finite element, or other computer language program for the analysis of FRP-confined concrete members.
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