Currently, the technical specification "CECS102-2002 for Steel Structure of Light-Weight House with Portal Frame" is being used. During the design of roof purlins and wall girders, the GB 50018-2002 standard for cold-formed thin-walled steel structures can also be referenced. These two sets of specifications are often used together in practice. One key difference between them lies in how the purlin is designed. According to the "Technical Specification for Cold-Bent Thin-Walled Steel Structures GB 50018-2002," when a bracing member is located at the far end, it can be assumed that the out-of-plane support provided by the bracing reduces the effective length of the purlin. This allows for more efficient structural design and potentially lighter sections without compromising safety. Understanding these differences is crucial for engineers to ensure compliance with both standards while optimizing the structural performance.
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