At present, the technical specification "CECS102-2002 for steel structure of light-weight house with portal frame" is adopted. In the design process of roofing girders and wall girders, the technical specification of cold-formed thin-walled steel structure GB 50018-2002 can be referred to, two sets. The difference in the specification of the design of the purlin is that: according to the "cold bending thin-walled steel structure technical specification GB 50018-2002", when the brace is at the far end, it can be considered that when the distal flange of the purlin is pressed, the brace Supports off-plane support to reduce the calculated length of the stringers. Fresnel Led,Fresnel Cob Led,Led Fresnel Spotlight,Led Studio Fresnel EV LIGHT Guangzhou Co., Ltd , https://www.evlightpro.com