Fiber reinforced polymer (FRP) composites are often used to confine concrete for seismic strengthening of existing reinforced concrete (RC) columns and concrete filled FRP tubes as earthquake-resistant columns in new structures. For the safety and serviceability of these structural elements, it is essential to understand the behavior of FRP confinement at the element level. This is often done by observing the stress-strain behavior of FRP-confined concrete under axial compression. In the past two decades, many researchers conducted extensive experimental and analytical investigations in order to understand and predict the stress-strain behavior of FRP-confined concrete under axial compression. This paper presents an extensive review of the previously published literature on the axial stress-strain behavior of FRP-confined concrete in circular concrete sections. The reviewed models are categorized into two broad groups; design orientated models (DOMs) and analysis oriented models (AOMs). In the final part of the paper, a critical discussion is presented by comparing the constitutive models with the experimental results. The essential factors that influence the overall performance of the models are also highlighted.
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