Three-Dimensional Modeling of Steel Portal Frame Buildings
Publication: Journal of Structural Engineering
Volume 125, Issue 8
Abstract
The realistic strength and deflection behavior of industrial and commercial steel portal frame buildings are understood only if the effects of rigidity of end frames and profiled steel claddings are included. The conventional designs ignore these effects and are very much based on idealized two-dimensional (2D) frame behavior. Full-scale tests of a 12 × 12 m steel portal frame building under a range of design load cases indicated that the observed deflections and bending moments in the portal frame were considerably different from those obtained from a 2D analysis of frames ignoring these effects. Three-dimensional (3D) analyses of the same building, including the effects of end frames and cladding, were carried out, and the results agreed well with full-scale test results. Results clearly indicated the need for such an analysis and for testing to study the true behavior of steel portal frame buildings. It is expected that such a 3D analysis will lead to lighter steel frames as the maximum moments and deflections are reduced.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 125 • Issue 8 • August 1999
Pages: 870 - 878
History
Received: Nov 24, 1998
Published online: Aug 1, 1999
Published in print: Aug 1999
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