Distortional Lateral Torsional Buckling Analysis of Beams with Overhangs
Publication: Journal of Structural Engineering
Volume 145, Issue 3
Abstract
The present study investigated the effect of web distortion on the lateral torsional buckling strength of Gerber systems. Toward this goal, a number of modifications were introduced into two finite-element formulations for the distortional and nondistortional lateral torsional buckling analysis. The distortional formulation treated the web as a thin plate and the flanges as Gjelsvik members and captured load height effects. The nondistortional formulation was based on the Vlasov beam kinematics and enabled the enforcement of lateral restraints offset from the shear center while preserving the positive definiteness of the stiffness matrices. Both models were validated against shell finite-element solutions and then utilized to develop moment gradient coefficients for Gerber beams, assess the web distortional effects, and quantify the influence of various lateral bracing scenarios on the elastic lateral torsional buckling strength. Unlike rolled simply supported beams in which web distortion was considered to be insignificant, the present study indicated that web distortion heavily influences the lateral torsional buckling strength of Gerber beams.
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Acknowledgments
The authors wish to express their gratitude to Mr. George Casoli, Dr. Feng Rong, Dr. Siriwut Sasibut, and Dr. Marinos Stylianou, from S-FRAME Software, Inc. for their feedback throughout the project. Financial support from S-FRAME Software, Inc. and matching funds from the Natural Sciences and Engineering Research Council (NSERC) of Canada are also gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 3 • March 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Feb 1, 2018
Accepted: Aug 23, 2018
Published online: Dec 28, 2018
Published in print: Mar 1, 2019
Discussion open until: May 28, 2019
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