Dapeng Town Industrial Park, Tongshan District, Xuzhou City, Jiangsu Province, China
The space frame steel structure and stainless steel space frame usually lose the load-bearing capacity at a temperature of 450～650℃, and cause great deformation, which causes the steel column and steel beam to bend. As a result, the steel structure and the stainless steel space frame can not be used continuously because of the excessive deformation. The fire resistance limit of the protected steel structure is about 15 minutes. The length of this time is also related to the speed at which the component absorbs heat.
In order to make steel structure materials overcome the shortcomings of fire protection in practical applications, fire protection treatment must be carried out, the purpose of which is to increase the fire resistance limit of steel structures to the limit specified in the design code. There are various measures to prevent the steel structure from heating up rapidly and causing deformation and collapse in a fire. The key is to adopt different methods according to different situations, such as using heat insulation and refractory materials to block the flame and directly burn the steel structure to reduce the speed of heat transfer. Postpone the temperature rise and weakening of the steel structure. But no matter what method is adopted, the principle is the same.
Whether or not to paint fire-resistant coatings for steel space frame of stainless steel space frame should be determined according to the fire hazard category. The “Code for Design of Building Fire Protection” clearly stipulates that it is not necessary to paint for categories D and E and must be painted for category C and above. Steel, as a building material, has some unavoidable defects in fire protection. Its mechanical properties, such as yield point, tensile strength and elastic modulus, will drop sharply due to the increase in temperature. Therefore, it is very necessary to make space frame and steel structures for fire protection.
