Experiment and Simulation of Temperature Distribution for H-shape Beams under Local Fire Condition

H-shape steel beams were examined under local fire condition in a small space where the heat source temperature was 880 ℃, the temperature distribution of the H-shape steel beams along the height direction was collected and compared with the experimental data from profiled steel sheet-beton built-up beams under local fire condition. Temperature fields of several thin wing H-shape steel beams normally used in engineering were simulated under local fire condition in a small space, using thermal physical parameters deduced from numerical simulation by finite element software ANSYS and based on the experimental data. Results show that H-shape steel got a high temperature in a fire for 30 min, and the temperature distribution show great difference in each part of the beam, the highest temperature of the bottom flange was 630 ℃ while it was only 300 ℃ of the top flange.The temperature gradient of H-shape steels increased gradually from the bottom to the top, the temperature-time curves were nonlinear. The experiment results proved the accuracy of the simulation.