Numerical Analysis on Failure Modes of Steel Frame under Fire Combined Blast Loads

An H-shaped steel frame in fire combined blast loading was numerically developed in this paper using finite element method by ANSYS thermal analysis. At the first step, a temperature field has been numerically analyzed. At the second step, each element of the steel frame was assigned different modulus of elasticity and yield stress based on the temperature analysis results. A dynamic simulation of the steel frame subjected to a blast load was analyzed under such a temperature field. The failure modes of the frame structure has been discussed. Finally, a same shape frame at the room temperature under the same blast load was simulated to compare with that at the elevated temperature.