Distortional buckling of simple lipped channel in bending results of the experimental analysis versus direct strength methods

Javaroni, Carlos Eduardo [UNESP]; Gonçolves, Roberta Martins

Distortional buckling of simple lipped channel in bending results of the experimental analysis versus direct strength methods

Date

2006-12-01

Authors

Javaroni, Carlos Eduardo

Gonçolves, Roberta Martins

Type

Work presented at event

Access right

Acesso aberto

Abstract

Cold-formed steel members are subject to failure caused by buckling, normally under loads smaller than those corresponding to partial or total yielding of the cross section. The buckling of members in bending can be classified as local or global, and the occurrence of one or the other type is expected by the members' geometric characteristics and by the constraints and load conditions. One of the local instability modes that can characterize a member's failure is distortional buckling of the cross section occurring on its own plane and involving lateral displacements and rotations. This paper presents and discusses the procedures and results obtained from experimental tests of cold-formed steel members under bending. Forty-eight beams were carried out on members in simple lipped channel, in pairs, with 6-meter spans and loads applied by concentrated forces at every 1/3 of the span. The thickness, width and dimensions, of the stiffeners were chosen so that the instability by distortion buckling of the cross section was the principal failure mode expected. The experimental results are compared with the obtained results by using the direct strength method.

Keywords

Cross section, Direct strength method, Distortional buckling, Buckling, Cold forming machines, Failure analysis, Loading, Stiffness, Structural analysis, Steel structures

Language

English

Citation

Eighteenth International Specialty Conference on Cold-Formed Steel Structures: Recent Research and Developments in Cold-Formed Steel Design and Construction, v. 2006, p. 133-146.