Inelastic Bending and Torsion of Steel I‐Beams
Publication: Journal of Structural Engineering
Volume 120, Issue 12
Abstract
The inelastic combined bending and torsion of I‐section beams is investigated in this paper using the finite‐element method. The elastic‐plastic load‐deformation relationships of beams under combined bending and torsion are determined by taking into account the effects of large deformations, material inelasticity, and initial conditions of residual stresses and geometric imperfections. The interactions between in‐plane bending, flexural‐torsional buckling, and torsion are studied. The effects of secondary bending actions about the minor axis caused by torsional rotations are important for the interaction between bending (with flexural‐torsional buckling) and destabilizing torsion. Interaction equations for the design of I‐section beams against combined bending and free torsion, and against combined flexural‐torsional buckling and destabilizing torsion, are proposed. It is found that a commonly quoted circular interaction equation for combined bending and torsion does not always provide a true lower bound for I‐section beams.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 12 • December 1994
Pages: 3397 - 3417
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Dec 20, 1993
Published online: Dec 1, 1994
Published in print: Dec 1994
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