Distortional buckling of perforated cold-formed steel channel-section beams with circular holes in web

Abstract

This paper presents the numerical and analytical investigations on the distortional buckling of perforated cold-formed steel channel-section beams with circular holes in web. The numerical investigation involves the use of finite element methods. In the analytical analysis the distortional buckling model recommended in EN1993-1-3 is employed. The influence of the web holes on the distortional buckling behaviour and corresponding critical stress and moment of perforated cold-formed steel channel-section beams are discussed. Finally, a simple analytical formulation is proposed for evaluating the effect of hole size on the reduction of critical stress and critical moment of the channel-section beams with circular holes in web.

An analytical solution of distortional buckling resistance of cold-formed steel channel-section beams with web openings

“…The influence of holes on the distortional buckling behaviour has also been examined. From the present work, the following conclusions can be drawn:  The proposed analytical solution predicts the distortional buckling stress of PCFS channelsection beams, which is more accurate than that obtained from modified EN1993-1-3 model [17].…”

“…Crisan et al [14][15] studied the behaviour of PFCS sections in compression using experimental, numerical and theoretical methods. Experiments were carried out by Moen and Schafer [16] [17] presented an analytical formulation to predict the distortional critical buckling stress of PCFS beams, the distortional buckling model of CFS sections recommended in EN1993-1-3 was employed. However, the distortional buckling stress obtained from modified EN1993-1-3 [18] model was found to be conservative, compared with that from Hancock [19] method or numerical methods.…”

Effect of shear stress on distortional buckling of CFS beams subjected to uniformly distributed transverse loading

“…1000 mm and 1500 mm) are also carried out using ANSYS software. The reason for selecting such a section size and such short beam lengths is to make sure the smaller critical stresses obtained from the finite element analysis include the distortional buckling mode [29]. The beam analysed is assumed to be simply supported at its two ends and subjected to a uniformly distributed transverse loads q cr applied at the shear centre.…”

A Study on the Effect of Hollow Tubular Flange Sections on the Behavior of Cold‐Formed Steel Built‐Up Beams

“…Wang et al [3] have optimized the cross-sectional shapes of CFS beams and beam-columns by considering the axial load and the bending moment for a single-symmetric section. Yuan et al [4] and Moen and Schafer [5] have investigated the buckling behavior of CFS beams with holes in the web. Wang and Young [6] have studied the behavior of CFS built-up section beams with different screw arrangements.…”