Buckling Behavior of Sinusoidal Web for Composite Wood I-Joist with Elastically Restrained Loaded Edges under Compression
Publication: Journal of Engineering Mechanics
Volume 139, Issue 8
Abstract
Wood I-joists are efficient and lightweight structural members that are well suited for long-span floor and rafter applications. However, because of the thin-wall nature of the web and relatively low stiffness, local web buckling of the joist is an issue that must be considered. To increase the buckling capacity of these joists, investigators at West Virginia Univ. and Univ. of Idaho developed web panels with a sinusoidal geometry, instead of the flat web panels commonly used for prefabricated I-joists. This study presents analytical modeling, experimental testing, and finite-element (FE) analysis of the local buckling capacities of these sinusoidal web panels under compression. The flanges and web are not rigidly connected; thus, this problem can be described as the instability of a sinusoidal shell with two rotationally restrained loaded edges under compression. Using an energy method, the critical compression buckling stresses were obtained in terms of the elastic rotational restraint stiffness. The analytical solution was verified by FE analysis. Compression tests were performed for joists with both flat and sinusoidal webs, each at two different heights, to evaluate the elastic rotational restraining effect and illustrate the increase of the buckling capacities for sinusoidal webs compared with flat webs. Finally, a parametric study was conducted to study the core aspect ratio effect on the buckling load. The method described in this paper can be further extended to determine local buckling capacities of other structural shapes with elastic restraints along the loaded edges.
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Information
Published In
Journal of Engineering Mechanics
Volume 139 • Issue 8 • August 2013
Pages: 1065 - 1072
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 30, 2011
Accepted: Mar 26, 2012
Published online: Mar 28, 2012
Published in print: Aug 1, 2013
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