For the purpose of determining the load-carrying capacity of cold-formed steel structural members, the effective width approach has been used. Since most studies were limited only to the structural members, which were assembled from the same material in a given section, this investigation was concentrated on a study of structural strength and behavior of hybrid cold-formed steel beams subjected dynamic loads. An investigation was also conducted to study the validity of effective design width formulas for the design of these specimens. The materials used in this study were 25 AK and 50 SK sheet steels. A total of 72 spot-welded closed-hat sections were tested under different strain rates. The results showed that the structural strengths including yield moment and ultimate moment of hybrid cold-formed steel beams increase with increasing strain rates. In the determination of the strength of hybrid sections, the effective cross-sectional area calculated on the basis of the dynamic yield stresses can be employed. A design procedure was also developed to compute the member strength of hybrid beams. © 2002 Elsevier Science Ltd. All rights reserved.


Civil, Architectural and Environmental Engineering


American Iron and Steel Institute, Grant None

Keywords and Phrases

Cold-formed steel; Critical local buckling moment; Hybrid beam; Ultimate moment; Yield moment

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


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© 2024 Elsevier, All rights reserved.

Publication Date

01 May 2002