Numerical investigations on a wide reinforced concrete beam subjected to fire

摘要

Use of wide pre-stressed reinforced concrete beams is moderate due to their mechanical disadvantages with respect to the regular ones but also due to the uncertainty in their behavior. Wide beams are still the right solution when complex optimization parameters are imposed. Fire provisions are foreseeing specific concrete cover of reinforcement but excessive deformation of bended concrete elements can lead to crack appearance and excessive exposure of reinforcement to fire. Limited deformation of a concrete beam by pre-stressing could postpone appearance of cracks and as consequence it could increase the fire resistance of the element, but how the large width of the beam is influencing its behavior when subjected to fire? The paper is presenting numerical modeling for three different fire scenarios for the wide pre-stressed reinforced concrete beam.