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

This article reports on a study of the axial behavior and modeling of confined circular sections of concrete with carbon fiber-reinforced polymer (FRP) jackets. The authors note that 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. The study involved axial load tests of small-scale (152 mm diameter by 305 mm tall cylinders), medium-scale (254 mm diameter by 762 mm tall), and large-scale (610 mm in diameter by 1.83 m tall) circular concrete specimens, all of which had a height-to-diameter ratio less than or equal to 3.0. At the relatively high level of confinement provided, a scale effect was not observed; similar results were observed regardless of column size. The authors conclude by presenting appropriate parameters for modeling confined concrete and by making recommendations for the modeling and design of axially-loaded confined concrete.

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