EXPERIMENTAL RESEARCH ON GFRP COLUMNS FILLED WITH STEEL-REINFORCED HIGH-STRENGTH CONCRETE SUBJECTED TO ECCENTRIC COMPRESSION LOAD

Based on the eccentric compression experiments of 8 GFRP tubes filled with steel-reinforced high-strength concrete composite columns, the mechanism and failure modes of these columns were studied considering the variation of main effect Parameters, such as the GFRP tube fiber tangle angle, the GFRP tube thickness, the slenderness ratio and the eccentricity. The experimental results show that the bearing compressive capacity of composite columns obviously increases with the decrease of the fiber tangle angle and the thickness increase of GFRP tube, but decreases with the increase of the eccentricity and slenderness ratio. The theoretical calculating formula of GFRP columns filled with steel-reinforced high-strength concrete subjected to eccentric compression was proposed based on test study and theoretical analysis, and the calculated results agreed well with the experimental results.