Browsing by Author "von der Heyden, Aaron"
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- Distortional Buckling Experiments on Cold-Formed Steel Joists with Unstiffened HolesSchudlich, Anna; von der Heyden, Aaron; Moen, Cristopher D. (2011-09-01)Experiments were conducted on cold-formed steel C-section joists with rectangular unstiffened web holes. The presence of holes decreased joist capacity and amplified distortional buckling deformation. Distortional buckling was accompanied by unstiffened strip buckling of the compressed web. When hole depth approached the web depth, sudden flexural buckling of the compressed flange at the hole was observed. Forthcoming direct strength method equations for joists with holes accurately predicted flexural capacity when web hole depth equaled two-thirds the web depth, and was unconservative for larger web holes.
- Elastic Buckling of Cold Formed Steel Beams with Unstiffened Holesvon der Heyden, Aaron; Moen, Cristopher D. (2011-04-01)Critical elastic buckling analyses for cold-formed steel beams with unstiffened holes are performed in this assignment. The beam dimensions, boundary and loading conditions for the conducted simulations are based on experiments conducted by A. Schudlich [14]. Critical buckling moments for local, distortional and global buckling are calculated on the one hand by using the finite element method and on the other hand by employing the simplified methods for deriving critical elastic buckling parameters for coldformed steel provided by the American Iron and Steel Institute’s Direct Strength Method (DSM) [1]. The results of both analyses have been compared in order to validate the DSM simplified methods. Also beams without holes are considered in this assignment as well as all beams with holes are also simulated without holes included. With comparing the results of members without holes to those members with holes, the influence of unstiffened holes can be obtained.