Advanced Steel Construction

Vol. 4, No. 3, pp. 243-259 (2008)


EFFECT OF END CONNECTION RESTRAINTS ON THE STABILITY OF STEEL BEAMS IN BENDING

 

S. Amara 1,*, D.E. Kerdal 2 and J.P. Jaspart 3

1 Department of Civil Engineering, Civil Engineering Laboratory, Laghouat University, Algeria

2 Professor, Department of Civil Engineering, LM2SC Laboratory, U.S.T.Oran, Algeria

3 Professor, ArGEnCo Department, Liège University, 1 Chemin des Chevreuils, Liège, Belgium

* (Corresponding author: tel:+213 776 13 05 51; fax:+213 29 93 26 98; email: This email address is being protected from spambots. You need JavaScript enabled to view it.)

 

Received: 1 June 2008; Accepted: 15 August 2008

DOI:10.18057/IJASC.2008.4.3.6

 

ABSTRACT:

The influence of the end restraint conditions on the lateral-torsional buckling of beams is investigated in detail using finite element method. The paper focuses on the limitation of Eurocode 3 regarding the lateral bending and torsional restraint coefficients kz and kθ of the end supports. Theoretical expressions of the coefficients kz and kθ taking into account the minor axis flexural restraint at the support and the end torsional restraint respectively are presented. The introduction of new coefficients kz and kθ representing the actual support conditions in the expression of the elastic critical moment is suggested. A comparison between the elastic critical moments for various beam cross-sections, lengths and various end restraints, obtained from the finite-element method, and those derived from EC3 ENV method, in which the proposed coefficients kz and kθ are introduced, confirms the reliability of these coefficients that model the end support conditions.

 

Keywords:Elastic lateral-torsional buckling; End restraints; Elastic critical moment; Out-of plane bending; Uniform torsion; Warping

 

Download PDF: