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Item Information   Holdings       More by this author     Marshall, Lucas B.     Subjects     Steel -- Cold working     Buckling (Mechanics)     Structural failures     Strains and stresses     MSST Project.     Browse Catalog     by author:      Marshall, Lucas B.       by title:      Distortional bucklin...         MARC Display

Distortional buckling of cold-formed steel studs with multiple compression flanges / by Lucas B. Marshall. by Marshall, Lucas B. Subjects Steel -- Cold working   Buckling (Mechanics)   Structural failures   Strains and stresses   MSST Project. Description:  127 leaves : ill. ; 29 cm. Contents:  Thesis advisor: Dr. Douglas Stahl. Committee members: Dr. Hans-Peter Huttelmaier, Dr. Christopher Raebel. Introduction -- Background and literature review -- Finite element model -- Conclusions and recommendations -- A: ANSYS log files Reflecting a lack of relevant literature, the 2007 edition of American Iron and Steel Institute North American Specification for the Design of Cold-Formed Steel Structural Members provides insufficient guidance on how to determine the moment strength of members subjected to weak axis bending. Specifically, the specification is silent on distortional buckling of such members. Recent literature on testing of shear walls, suggests that distortional buckling can be a critical limit state for cold-formed members in weak axis bending, so practical methods to predict it are needed. The objectives of this project are to investigate analytically the distortional buckling behavior of cold formed members subjected to bending stress about the weak axis, and to explore the application of the "reduced web thickness method" for finite strip analysis for members with standard slotted web holes bent about their weak axis. A finite element method eigenvalue buckling analysis is used to explore the distortional buckling limit state. The accuracy of the finite element model is established by comparing its results to work reported by other researchers, to the closed form equations from the specification, and to a finite strip analysis. The results of the finite strip and finite element analyses are compared to the yield moment to show that distortional buckling is a valid limit state for some members in weak axis bending. Comparisons of finite element results for specimens with and without holes show that standard slotted holes do affect the distortional buckling strength of members in weak axis bending. The strength reduction is proportional to the ratio of the depth of the specimen to the height of the hole, and is significant for some such ratios. Results also show that the reduced web thickness method to account for the effect of holes in a finite strip analysis, verified in the literature for strong axis buckling, requires adjustment with a constant multiplier to provide better accuracy for specimens in weak axis bending.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .M363 2012 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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