Finite Element Modeling of Concrete-Filled Steel Tubular Column after Exposure to Fire
A computational model, in which the effects of high temperature on steel and concrete’s properties and the composite action and interfacial properties between steel tube and concrete core were considered, was developed using ABAQUS program. Based on a damage model of concrete at ambient condition and tested stress versus strain curves of fire-damaged concrete, a new damage model of concrete after exposure to high temperatures was developed to consider the influence of high temperatures on the damage of concrete. By introducing the damage model of fire-damaged concrete, the reasonable equivalent stress-strain relations of confined concrete and a modified steel tube-concrete interface model into the ABAQUS FE model, the mechanical behaviors of the fire-damaged CFT columns and connections were simulated precisely and verified by some relative test results.
Jingsi Huo, Yan Xiao, Zongjin Li and Shuaib Ahmad
J. S. Huo and H. Qu, "Finite Element Modeling of Concrete-Filled Steel Tubular Column after Exposure to Fire", Key Engineering Materials, Vols. 400-402, pp. 775-781, 2009