SOFTWARE DEVELOPMENT AND EXPERIMENTAL VERIFICATION ON REINFORCED CONCRETE FRAME AFTER FIRE BASED ON FIBER ELEMENT

Based on the principle of a fiber element model and a layered shell element model, the secondary development is executed with the scripting language of Python on the platform of ABAQUS software and the Analytical System of a Fire-damaged Concrete Frame (hereafter referred to as the system of ASFCF) is established for the purpose of accurately simulating the residual mechanical properties of the reinforced concrete frame after fire. In order to validate the system of ASFCF, two identical size, single-story and single-span spatial reinforced concrete frames with the floor are designed, one will be burned in fire and the other will not be fired. Then, the test of the beams and slabs of these two frames will be conducted under monotonic loading in order. Nonlinear finite element analyses for the two test specimens are carried out by the system of ASFCF. The results show that the simulation agrees well with the test. It indicates that the fiber element model and the layered shell element model can be used to simulate the beams (columns) and slabs of the reinforced concrete frame after fire, respectively. The thermo-mechanical coupled analysis results of the reinforced concrete frame after fire by use of the system of ASFCF are precise and reliable, and the system of ASFCF can be well utilized to calculate and evaluate the residual bearing capacity of the reinforced concrete frame after fire.