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Accounting for Cold Working and Residual Stress Effects on the Axial Strength of HSS Bracing Members

Ihor Koval

Master's thesis (2018)

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Abstract

Cold-formed hollow structural shapes (HSSs) are commonly used for bracing members in concentrically braced frames. The continuous rolling process used for the fabrication of HSSs results in yield strength properties that vary along the perimeter of the cross-section due to strain hardening. For instance, higher yield strength is observed in the corners of square and rectangular HSSs compared to the values obtained from tensile tests on coupons taken from the HSS walls. The forming process also induces longitudinal and transverse residual stresses that affect the compressive resistance of HSS members.

Résumé

Les profilés HSS couramment utilisés comme membrures diagonales dans les contreventements concentriques sont habituellement formés à froid. Le processus de laminage en continu utilisé pour ces HSS induit un gradient sur la limite élastique de l'acier sur le contour de la section à cause de l'écrouissage de l'acier. Par exemple, pour des profilés HSS carrés ou rectangulaires,dans les coins est beaucoup plus élevée que dans les parois droites. Le processus de laminage en continu induit aussi des contraintes résiduelles longitudinales et transversales importantes. Dans la conception sismique, les forces de conception dans les connexions, colonnes et les poutres dépendent des forces réelles obtenues.

Department: Department of Civil, Geological and Mining Engineering
Program: Génie civil
Academic/Research Directors: Robert Tremblay
PolyPublie URL: https://publications.polymtl.ca/3317/
Institution: École Polytechnique de Montréal
Date Deposited: 16 Nov 2018 15:21
Last Modified: 24 Apr 2023 22:14
Cite in APA 7: Koval, I. (2018). Accounting for Cold Working and Residual Stress Effects on the Axial Strength of HSS Bracing Members [Master's thesis, École Polytechnique de Montréal]. PolyPublie. https://publications.polymtl.ca/3317/

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