美国钢结构设计手册 COLD-FORMED STEEL DESIGN.pdf

SECTION 10 COLD-FORMED STEEL DESIGN R. L. Brockenbrough, P.E. President, R. L. Brockenbrough Associates, Inc., Pittsburgh, Pennsylvania This section presents information on the design of structural members that are cold-formed to cross section shape from sheet steels. Cold-formed steel members include such products as purlins and girts for the construction of metal buildings, studs and joists for light com- mercial and residential construction, supports for curtain wall systems, formed deck for the construction of floors and roofs, standing seam roof systems, and a myriad of other products. These products have enjoyed significant growth in recent years and are frequently utilized in some shape or form in many projects today. Attributes such as strength, light weight, versatility, non-combustibility, and ease of production, make them cost effective in many applications. Figure 10.1 shows cross sections of typical products. 10.1 DESIGN SPECIFICATIONS AND MATERIALS Cold-formed members for most application are designed in accordance with the Specification for the Design of Cold-Formed Steel Structural Members, American Iron and Steel Institute, Washington, DC. Generally referred to as the AISI Specification, it applies to members cold- formed to shape from carbon or low-alloy steel sheet, strip, plate, or bar, not more than 1- in thick, used for load carrying purposes in buildings. With appropriate allowances, it can be used for other applications as well. The vast majority of applications are in a thickness range from about 0.014 to 0.25