Design of Steel Beams in Cantilever-Suspended-Span Construction
Publication: Journal of Structural Engineering
Volume 121, Issue 11
Abstract
In cantilever-suspended-span construction, secondary framing members such as open-web steel joists are likely to enhance markedly the stability of the beams that support them. Properly made joist-beam connections enable the joists to provide both lateral and torsional restraints to the beam top flange at discrete locations. This restraint, in turn, is transmitted through the web to the bottom flange of the beam, which is in compression in negative moment regions. Therefore, the buckling modes are generally characterized by the occurrence of web distortion. Current design procedures for this very common form of construction are inadequate as they do not consider web distortion and the beneficial effect of torsional restraint. They may also neglect the detrimental effect of the height of load application above the shear center. This results in an inaccurate assessment of the lateral-torsional buckling resistance. A finite-element model, corroborated by tests, is used to develop a simplified design procedure for these beams.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 121 • Issue 11 • November 1995
Pages: 1667 - 1673
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Nov 1, 1995
Published in print: Nov 1995
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