This paper presents an experimental investigation on the behavior of FRP composite columns fabricated from a pultrusion process. The study includes five column cross-section configurations with various lengths. The objectives of the research are to determine the ultimate load capacity for each group, and to evaluate the effect of column slenderness on the mode of failure. A full scale column testing is performed under an axial compressive load condition in a vertical position. The test results and analysis from a large number of specimens have provided a comprehensive evaluation of the FRP composite columns for the application in civil engineering structures.
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