EXPERIMENTAL STUDY OF AXIAL COMPRESSIVE BEHAVIOR OF CFRP-CONFINED HIGH-STRENGTH CONCRETE DAMAGED BY HIGH TEMPERATURE

An experimental study was conducted to investigate into the axial compressive behavior of thermal damaged high-strength concrete ( HSC) confined with carbon fiber reinforced polymer ( CFRP) ． Based on tests，the axial compression failure mechanism was discussed，and the effects of the thermal damage and the amount of CFＲP on the compressive performance were analyzed． The results show that CFRP confinement is highly effective for enhancing the compressive strength and deformation capacity of the thermal damaged HSC columns． Comparing with that of the no damaged cylinders，the compressive strength of the damaged cylinders confined with same amount CFＲP was decreased only by 3% － 6%． The thermal damage and the amount of CFＲP had obvious effects on the failure mode of the CFRP-confined HSC cylinders． The compressive strength and ductility of the CFRP-confined HSC cylinders were increased with the increase of the CFRP amount． It should be noted that CFRP confinement can give a better improvement for the axial compressive behavior of the thermal damaged HSC than that of normal HSC．