Evaluation on horizontal load-bearing capacities of a steel frame after fire

摘要

In this research, the structural damages of the steel frame atthe fire and the post-fire was quantified by using the strainenergy of the members. When the heated column arranged inthe redundant frame buckled at the fire, the plastic strainenergy due to the upper storied beams progresses during thecooling phase after the fire. For that fire-damaged structure,the load bearing capacities at the story drift angle 1/200decrease in comparison with the intact frame without the firedamage.