Abstract
The present paper deals with the interactive buckling of thin-walled lipped channel (LC) beams under the bending moment in the web plane when the shear lag phenomenon and distortional deformations are taken into account. A plate model (2D) was adopted for LC beams. The structures were assumed to be simply supported at the ends. A modal method of solution to the interactive buckling problem within Koiter’s asymptotic theory, using the semi-analytical method (SAM) and the transition matrix method, was applied. LC-beams, from short through medium-long via long to very long beams, were considered. The paper focuses on the influence of the secondary global buckling mode on the load carrying capacity for the steel LC-beams under bending.
Highlights
IntroductionThin-walled cold-formed steel (CFS) members (columns, beams, and beam-columns) are widely used in the construction industry
Thin-walled cold-formed steel (CFS) members are widely used in the construction industry
The numerical methods often applied in nonlinear analysis of stability and load carrying capacity are as follows: finite strip method (FSM), finite element method (FEM), and generalized beam theory (GBT)
Summary
Thin-walled cold-formed steel (CFS) members (columns, beams, and beam-columns) are widely used in the construction industry. Reference [10] that dealt with post-buckling behavior of short beams with channel-section, subjected to pure bending, were the basis to carry out the research presented in this paper. C-beams subjected to the bending moment, with linearly variable stresses in the web plane, on the interactive buckling and load carrying capacity using semi analytical method (SAM) [11,12] was investigated. The influence of the distortional-lateral buckling mode on the interactive buckling of thin-walled short channels with imperfections subjected to the major-axis bending moment was analyzed. In the authors’ opinion, there is a lack of work devoted to the influence of the secondary global distortional-lateral mode on the interactive buckling and assessment of the load carrying capacity for LC-beams of various lengths. The coupled buckling of thin-walled steel LC-beams under bending in the web plane from short ones through medium-long to long beams is analyzed here
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