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Frame stability considering member interaction and compatibility of warping deformations Open Access


Other title
structural design
structural stability
beam column
steel structures
steel frames
structural analysis
torsional warping
Type of item
Degree grantor
University of Alberta
Author or creator
MacPhedran, Ian James
Supervisor and department
Grondin, Gilbert (Civil and Environmental Engineering)
Examining committee member and department
Moussa, Walied (Mechanical Engineering)
Tremblay, Robert (Génie Civil, L'École Polytechnique de Montréal)
Driver, Robert (Civil and Environmental Engineering)
Al-Hussein, Mohamed (Civil and Environmental Engineering)
Szymanski, Josef (Civil and Environmental Engineering)
Department of Civil and Environmental Engineering

Date accepted
Graduation date
Doctor of Philosophy
Degree level
Steel moment frames are often used in structures to provide lateral strength and stiffness to the structure. These frames are subject to failure modes including buckling in the out of plane direction in a lateral-torsional buckling mode. This failure mode is influenced by interactions of the members through their connections. While the flexural behaviour has been studied in depth and for some time, the effect of torsional warping interaction between members has not been studied extensively. This work presents an analysis of the effect of including the effects of warping interaction or neglecting them, as is done in the current design practice. The issues of inelastic behaviour are considered, as well as the case of torsionally sensitive members. A joint element model is created to treat the warping displacements and their continuity through the joint. The study finds that the current practice of neglecting the warping displacement continuity appears to be a conservative assumption. It is recommended that the present practice of neglecting the effects of warping in analysis of frames continues.
License granted by Ian MacPhedran ( on 2009-10-01T22:52:44Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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