The main functions of roof purlins include ‌ support, ‌ distribution load, connection and fixing. ‌ ‌

‌ supporting function ‌ : purlins directly support the roof sheet, the roof of the self weight, snow, wind and other loads transfer to the ‌ steel frame ‌ beam and ‌ column, so as to ensure the stability and safety of the roof system.
‌ distributed load ‌ : purlin can effectively distribute uniform or concentrated load on the roof, so that the load through the purlin, beams and columns evenly distributed to the foundation, to avoid local force is too large and cause structural damage.
‌ connection and fixing function ‌ : purlin through the connection with the roof plate, to provide stable support for the roof plate, to prevent displacement or deformation, to ensure that it is firmly fixed on the main body of the steel structure.
In addition, purlins also play the role of bearing and stabilizing the structure in the steel structure plant, by transferring the load of the roof to the supported columns or ‌ walls, sharing and transferring the load to ensure the stability of the entire building. Purlins are usually made of steel, have high strength and rigidity, can withstand large loads, and maintain long-term stability. At the same time, purlins also play an important role in supporting the roof ‌ wall material, ensuring its firmness and stability, and providing a flat installation benchmark, so that the roof wall material can be correctly installed and maintain a good look and feel.