In the steel structure building system, the purlin support plate is small but plays a vital role. It is like a bridge, connecting the purlin and the main body of the steel structure to ensure the stability and safety of the entire roof system. This article will introduce in depth the functions, types, design points and applications of purlin support plates in modern buildings.

The main function of the purlin support plate is to fix the purlin and transfer its load to the main body of the steel structure, such as steel beams or steel columns. It provides a stable support point for the purlin to prevent the purlin from displacement, twisting or overturning when subjected to external loads such as wind and snow. In addition, the purlin support plate can evenly distribute the roof load to various parts of the steel structure, thereby improving the bearing capacity and stability of the entire structure.

According to different connection methods and structural forms, purlin support plates can be divided into many types. Welded purlin support plates are more common. This type of purlin support plate is directly welded to the steel beam or steel column, with higher connection strength, and is suitable for buildings with high requirements for structural stability. Purlin support plates are usually made of Q235 or Q355 steel, with good strength and durability. Its shape and size are designed according to the cross-sectional form and load requirements of the purlin. Common ones are L-type, C-type, Z-type, etc. The design of purlin support plates needs to consider the following key factors: load calculation, connection method, anti-corrosion treatment, and economy.