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Axial Ultimate Compressive Strength of FRP-tube Reinforced Concrete Structure

By studying the mechanics characteristics of the axial compression of the combined structure in the late reinforcement service stage and the restricted condition of the composition materials,the predicted expression of the axial compressive ultimate stress of FRP-tube reinforced concrete is concluded.The axial compressive ultimate strength of the FRP reinforced concrete is obtained by synthesis method.The effect of the design parameters on the axial ultimate compressive strength of the combined structure is analyzed.The result shows that there's a nonlinear relationship between the fiber winding angle and the axial ultimate compressive strength and the best winding angle was 72 degrees at the maximum strength point of the combined structure.The axial ultimate compressive strength almost increases gradually with the increase of the content proportion of FRP tube.