Steel is a non combustible building material that has characteristics such as earthquake resistance and bending resistance. In practical applications, steel can not only relatively increase the load capacity of buildings, but also meet the needs of aesthetic design and styling of buildings; It also avoids the defects of concrete and other building materials that cannot bend or stretch. Therefore, steel has been favored by the construction industry, and it is common to use steel in single story, multi story, skyscrapers, factories, warehouses, waiting rooms, waiting halls, etc. However, as a building material, steel has some unavoidable defects in terms of fire prevention. Its mechanical properties, such as yield point, tensile strength, and elastic modulus, will sharply decrease with increasing temperature.