Do large-span steel structure space frame need to be fireproof
The long-span steel structure space frame usually loses its bearing capacity at a temperature of 450-650 °C, and undergoes great deformation, resulting in the bending of steel columns and steel beams, and cannot be used continuously due to excessive deformation. Generally, the fire resistance limit of unprotected steel structures is about 15 minutes. The length of this time is also related to the rate at which the component absorbs heat. In order to make steel structure materials overcome the deficiencies of fire protection in practical applications, fire protection treatment must be carried out. The purpose is to increase the fire resistance limit of the steel structure to the limit range specified in the design code. There are various measures to prevent the steel structure from deforming and collapsing due to rapid heating in a fire. The key is to take different methods according to different situations, such as using heat insulation and refractory materials to block the flame to d