With the wide application of the reinforced concrete structure, accidents of structural damage caused by fire occur frequently, and the research of fire resistance of reinforced concrete is increasingly important. Based on the full scale doorframe structure model of fire experiment, the study puts out the improvement to the simulation method of single beam and single column, using large-scale finite element analysis software ANSYS to analyze the thermal coupling simulation of the full scale doorframe structure. The calculated results and experimental values are compared. The calculated values ...