Numerical simulation of the risk of frame structure in fire

In this paper the fire temperature model and thermal-force performance model of composite beams has been establishment by a FORTRAN77 program, which is based on FDS simulation and the analysis of coupled relationship between thermal and mechanical performance. Through the program mentioned above, the temperature, the shear force, bending moment, deformation and displacement of two layers of composite beams in fire was simulated. The results showed that: in the single room fire, the upper beam is generally positive fire area; maximum displacement generally appear in the middle of the structure positive fire area; for two frame structure, the risk of thermal injury prone point is in the adjacent area of the fire or diagonal regional.