Teses #fluência

In this Thesis a study about the behavior of steel structures on fire was carried out. Comments about fire models (temperature-time curves of hot gases) are made and the expressions to determine the thermal action on the structures and its effect, the temperature on steel, are derived. The influence of load fire, opening factor (ventilation) and section factor (massivity factor) is discussed. Stress-strain curves of steel, including the creep phenomena, under high temperature are presented. A comparison between the safety criteria for the accidental situation of structures in fire, based on Brazilian and European Standards, is made. A simplified method of steel structures fire design is recommended and the influence of geometrical and material non linearities and thermal deformation are analyzed.