Abstract: The post-earthquake fire test based on components cannot fully and truly reflect the fire performance of local components of the overall structure after earthquake damage, therefore, ABAQUS software is used to establish the finite element of the steel-concrete frame under different damage combinations. The model combines multi-scale modeling methods with fire-resistance hybrid simulation to study the calculation results of different modeling methods, the influence of different damage combinations on the fire resistance limit of the structure, and the applicability of the fire-resistance hybrid simulation to evaluate the fire performance of the structure after earthquake. The conclusions show that the calculation time of the multi-scale element model is reduced by 68% and 61%, respectively, under the crack damage and the joint action of cracks and spalling compared with the micro-element model. The joint action of cracks and spalling is 22% lower than the fire resistance limit of crack damage. As the changes in boundary conditions are taken into account, the fire-resistance hybrid simulation can reflect the post-earthquake fire performance of the overall structure through partial component tests.

Key words: reinforced concrete frame, seismic damage, fire resistance, multi-scale, hybrid simulation