EXPERIMENTAL RESEARCH OF GFRP TUBE COLUMNS FILLED WITH STEEL-REINFORCED HIGH-STRENGTH CONCRETE SUBJECTED TO AXIAL LOADING

This paper presents the experimental research of 6 GFRP tube columns filled with steel-reinforced high-strength concrete subjected to axial loading. The effects of the GFRP tube fiber winding angle, GFRP tube thickness, and the steel of GFRP tube columns filled with steel-reinforced high-strength concrete were included in the scope of this investigation. The test results show that the bearing compressive capacity of composite columns obviously increase with the fiber tangle angle reducing, and increase with the increase of GFRP tube thickness. However, both the fiber winding angle and GFRP tube thickness have less influence on mechanical performance of the steel. The steel is not local yield because of the concrete. Meanwhile, the steel restrain concrete which increase the deformation capacity and bearing compressive capacity of composite columns. The theoretical calculating formula for GFRP tube columns filled with steel-reinforced high-strength concrete subjected to axial load is proposed by the base of the test study and theoretical analysis, and the results agree well with test results.