Experimental study on fire resistance of h-shaped steel beams with high strength bolted joints

This paper presents a experimental study on the structural behavior of H-shaped stee! beams with high strength bolted joints in case of fire. Load bearing fire tests were carried out under rotational restraint conditions at the both ends of the beam in order to investigate the temperature distribution of steel beams, the rotational performance of the friction type high strength bolted joints at high temperature, and the relation of critical temperature of steel beams with joints to permanent loads. Their critical temperatures of steel beams with joints are approximated by applying the strength of joints to the simple plastic theory because the rotational capacity of beam joints is remarkably improved at elevated temperature.