In order to analyze the mechanical performance of damaged

rehabilitated and strengthened spatial reinforced concrete frames after an experienced fire

two classical numerical models

i.e.the fiber element model and the layered shell element model are adopted in this paper to divide the cross section of beams or columns into concrete or steel fibers and the cross section of slabs into several layers in the direction of section thickness.These models can simulate the nonuniform temperature distribution across the section and the change of the mechanical properties of fire-damaged

rehabilitated and strengthened materials.Based on the platform of ABAQUS Software

the further development is promoted with the language of Python to build the Analytical System of Fire-damaged Concrete Frame（ASFCF）.A multi-story

multi-span spatial reinforced concrete frame after fire is taken as a case to analyze by use of ASFCF to research the mechanical responses of the concrete frame under three conditions of fire-damage

rehabilitation and strengthening.The results indicate that ASFCF can soundly analyze the mechanical properties of damaged

rehabilitated and strengthened spatial reinforced concrete frames after fire and it provides theoretical references for evaluating the residual mechanical properties and the mechanical behaviors of rehabilitated and strengthened concrete frames after fire.