Performances of FRP rebar reinforced concrete columns under fire condition

To well understand the fire resistance of FRP rebar reinforced concrete columns, the temperature field and mechanical performances of the columns under fire condition are analyzed by the finite element method. Results show that the fire resistance of such a reinforced column can be enhanced by either decreasing the reinforcement ratio or increasing the cross-section size. There also exists a better thickness of concrete cover for the optimal fire resistance. Based on an analysis of the results, a simple empirical formula of fire resistance time is proposed, in terms of the reinforcement ratio and cross-section size. The established finite element model is verified to be effective compared with the test.