Stub column response in light of local vs distortional buckling

Torabian, Shahabeddin and Chobe, G and Crews, James K. and Schafer, Benjamin W. (2020) Stub column response in light of local vs distortional buckling. In: 2020 Annual Stability Conference Structural Stability Research Council, SSRC 2020, 21-24 April 2020, Atlanta.

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The objective of this paper is to study the effect of distortional buckling on typical stub column testing used by industry to determine the effective area of cold-formed steel members under compression. Testing standards such as AISI S902 are intended to determine the effective area of stub columns experimentally; however, other failure modes such as distortional buckling or premature failure at the ends of the specimens can potentially occur prior to cross-section local buckling, and therefore the effective area could be underestimated. This can result in underestimating the capacity of longer compressive members in the design of real structures, where the overall capacity of the cross-section could be knocked down due to local-global buckling interaction. An experimental study on lipped channels and rack sections with relatively low distortional buckling capacity, compared to local buckling capacity, has been conducted at the Thin-Walled Structures Laboratory in Johns Hopkins University to shed light on the effect of other failure modes on the calculation of the effective area. Different end conditions including bare, intrack, welded, clamped, and also different means of artificially postponing the distortional buckling are examined experimentally, and practical recommendations have been provided on how to conduct experiments to get a more realistic effective area in stub column testing. © 2020 by the Structural Stability Research Council. All Rights Reserved.

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Item Type: Conference or Workshop Item (Paper)
Additional Information: This work was funded by the American Iron and Steel Institute. We are thankful of Unarco Material Handling, Inc. for their contribution. We would also like to thank Senior Technician Nickolay Logvinovsky for his assistance with the experimental setup. Any opinions expressed in this paper are those of the authors alone and do not necessarily reflect the views of the sponsors or authors' employers.
Uncontrolled Keywords: Cold-formed steel members; Compressive member; Different end conditions; Distortional buckling; Johns hopkins universities; Practical recommendation; Premature failures; Testing standards
Subjects: Civil Engineering > Construction & Building Technology
Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 23 Nov 2022 12:19
Last Modified: 23 Nov 2022 12:19
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