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Structural Engineering and Mechanics
  Volume 16, Number 5, November 2003 , pages 613-625
DOI: https://doi.org/10.12989/sem.2003.16.5.613
 


Lateral buckling of beams with top bracing
Jong Sup Park and Young Jong Kang

 
Abstract
    This paper presents the lateral-torsional buckling (LTB) of beams or girders with continuous lateral support at top flange. Traditional moment gradient factors (Cb) given by AISC in LRFD Specification for Structural Steel Buildings and by AASHTO in LRFD Bridge Design Specifications were reviewed. Finite-element method buckling analyses of doubly symmetric I-shaped beams with continuous top bracing were conducted to develop new moment gradient factors. A uniformly distributed load was applied at midheight and either or both end moments were applied at the ends of beams. The proposed solutions are simple and accurate for use by engineers to determine the LTB resistance of beams.
 
Key Words
    lateral stability; stability analysis; buckling; beam; bracing.
 
Address
Department of Civil Engineering, 238 Harbert Engineering Center, Auburn University, Auburn, AL 36849-5337, USA
Department of Civil and Environmental Engineering, Korea University, Seoul 136-701, Korea
 

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