Finite-Element Formulation for the Lateral Torsional Buckling of Plane Frames
Publication: Journal of Engineering Mechanics
Volume 139, Issue 4
Abstract
A finite-element formulation is developed for the lateral torsional buckling analysis of plane frames with moment connections consisting of two pairs of welded plate stiffeners. The finite element provides a realistic representation of the partial warping restraint provided by the joint to the adjoining members. The element consists of two nodes with four generalized buckling degrees of freedom per node and is thus devised to interface with two classical beam buckling elements connected at right angles. The new finite element extends the functionality of the classical beam finite element to predict the lateral buckling load for noncollinear structures, such as portal frames. A comparison with results based on shell finite-element analysis demonstrates the ability of the new formulation to reliably predict the lateral buckling resistance of plane frames at a fraction of the computational and modeling cost of shell-based finite-element solutions.
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Published In
Journal of Engineering Mechanics
Volume 139 • Issue 4 • April 2013
Pages: 512 - 524
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 16, 2011
Accepted: Jun 7, 2012
Published online: Jul 28, 2012
Published in print: Apr 1, 2013
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