The effect of discrete lateral and torsional bracings stiffness on the elastic lateral-torsional buckling of mono-symmetric I beam, under the concentrated moment

Subject Areas : Structural Engineering

E. Mohammadi ¹ ( M.Sc. Student of Structural Engineering, Department of civil engineering, Faculty of Technology and Engineering,CentralTehran Branch, Islamic Azad University, Tehran,Iran )
J. Asgari Marnani ² ( Assistant Professor, Department of civil engineering, Faculty of Technology and Engineering, CentralTehran Branch, Islamic Azad University, Tehran,Iran )
S. Tavousi ³ ( Assistant Professor, Department of civil engineering, Faculty of Technology and Engineering, CentralTehran Branch, Islamic Azad University, Tehran,Iran )
M.S. Rohanimanesh ⁴ ( Assistant Professor, Department of civil engineering, Faculty of Technology and Engineering, CentralTehran Branch, Islamic Azad University, Tehran,Iran. )

Received: 2014-07-05 Accepted : 2014-09-20 Published : 2014-09-01

Keywords: Finite element analysis, Elastic lateral-torsional buckling, Mono-symmetric I-beams, Steel structures, discrete torsional and lateral bracing,

Abstract :

When the out-of-plane stiffness of a beam is remarkably lower than the in-plane stiffness, the lateral-torsional buckling occurs. In this study, the behavior of mono-symmetric I-beams with discrete torsional and lateral bracings under the concentrated moment is investigated using the finite element analyses. Then, based on the numerical analyses, equation for the stiffness requirement is proposed. The results show that the location and the type of the bracing have an important role on the stiffness requirement and buckling strength.