How to plan the layout of steel purlins?

Steel purlins are structural elements used in roof construction, designed to transfer loads from the roofing to the truss. Their proper placement is crucial for the stability of the entire structure and ensuring safety. When planning the layout of purlins, many factors need to be considered, such as the roof span, loads, or the type of material. Steel purlins are available in the offer of e-PROJECT21. Let’s take a closer look.

Load Analysis of the Roof Structure

Before starting to plan the layout of steel purlins, a key step is the analysis of the loads acting on the roof structure. For steel purlins, the loads are divided into permanent and variable loads. Permanent loads include the self-weight of the structure, roofing material, or insulation. In contrast, variable loads are factors such as snow, wind, or additional installation loads. Each of these elements affects the choice of the appropriate load-bearing capacity of the purlins and their placement within the structure. Therefore, it is essential to perform detailed static calculations to determine the loads that each purlin must bear and how these loads will be distributed across the entire roof truss.

Selecting the Cross-Section and Type of Steel Purlins

The next step in planning the layout of steel purlins is choosing the appropriate cross-section and type of purlins. Various types of purlins are available on the market, such as closed, open, or I-beam profiles. The choice of cross-section depends on the roof span, type of loads, and preferred installation technology. I-beam purlins are often used due to their high strength and rigidity, while closed and open profiles, known as cold-formed, are characterized by high load capacity and resistance to twisting with relatively lower self-weight. It is crucial that purlins are properly dimensioned for bending strength and compressive forces, so they can effectively transfer loads to the supporting structure. The selection of purlins should always be supported by static calculations to ensure the optimal solution for the given roof structure.