An extensive experimental program has been conducted to investigate the structural behavior of axial concrete members confined with fiber reinforced polymer (FRP) composites. The study was performed on both steel-reinforced and unreinforced concrete members wrapped with carbon/epoxy and E-glass/epoxy FRP composite laminates. Concrete members with several cross-sectional geometries were investigated including circular, square, rectangular, hexagonal and octagonal. In all tests, the large-scale column specimens were subjected to pure quasi-static axial compression loads only, and no lateral loads were applied. A total of 107 large-scale column specimens were tested in this comprehensive experimental program to better understand the advantages of using FRP composites in concrete confinement applications. This study is considered to be one of the first experimental programs conducted on large-scale concrete axial members. The majority of the published data were generated from standard 6' X 12' concrete cylinders tests which does not account for the scale-factor of orthotropic behavior of the concrete/composite hybrid system. This is due to the large loading capacity requirements for testing machines that are in the order of multi-million pounds capacity. In this study, a 7-million pounds compression testing machine was available and was used in the experimental program. This paper reports only the experimental results generated from the circular jacketed columns tests.
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