Lateral-torsional buckling of continuous bridge girders

✍ Scribed by Peter Collin; Mikael Möller; Bernt Johansson

• Book ID: 104289810
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 242 KB
• Volume: 45
• Category: Article
• ISSN: 0143-974X
• DOI: 10.1016/s0143-974x(97)00063-1

✦ Synopsis

The resistance of bridge girders with respect to lateral-torsional buckling at support is strongly influenced by the moment gradient. In most design methods this influence is taken into account by the use of a correct critical bending moment in the slenderness parameter . This critical moment is influenced by the shape of the moment diagram as well as the distortion of the cross-section and the restraint from the web and stiffeners, if any. In this paper, a method for the calculation of the critical moment is presented. A further effect of the moment gradient is that the stresses due to lateral bending of the flange in connection with lateral-torsional buckling does not coincide with the maximum of stresses caused by bending in the vertical plane. This is taken into account by performing the check for lateral-torsional buckling in a design section at some distance from the support. A design procedure based on this concept has been introduced in Eurocode 3 Part 2: Steel Bridges.