Abstract: In order to clarify the influence of geometric damage of concrete frame structure caused by earthquake on the degradation law of fire resistance after earthquake, the seismic damage data and seismic test records are analyzed and summarized. The spalling and residual deformation of concrete protective layer are taken as the seismic damage form of concrete structure, and the damage size is determined by data statistics and regression analysis. Thus, the finite element model of two-story and two span earthquake damaged reinforced concrete plane frame is established, and the deformation characteristics of frame structure and the effects of fire position, axial compression ratio and story displacement angle on the fire resistance of plane frame structure are obtained.

Key words: post earthquake fire, seismic damage of reinforced concrete frame, fire resistance time