BENDING RESISTANCE OF COMPOSITE STEEL-CONCRETE BEAMS IN FIRE SITUATION

The objective of this paper is to determine the bending resistance of composite beams in fire situation. The study was carried out in two stages: the first one represented the thermal analysis and the second the structural analysis. The thermal analysis was done in a commercial software based in the finite element method. The structural analysis was based in the simplified method of calculation recommended by the NBR 14323. Three cases has been studied: profile without protection, profile with full protection and the profile with partial protection. As the result, the development and the distribution of temperatures at the composite cross-section was determinated. In the same way, the mechanical behavior of the simply supported beam was investigated, mainly, detaching the partial fire protection, whose its use as thermal isolate is an alternative to the reduction of costs, but it needs to be used with critical sense.