Behaviour of thin-walled cold-formed steel members in eccentric compression

Upper-bound estimation of load-carrying capacity of perforated cold-formed thin-walled steel lipped channel columns under compression loading

“…(1)): [22] (c) -theoretical plastic mechanism model [34] It was stated on the basis of experimental observations, that local plastic mechanisms were formed in all tested columns in the perforation area. The mechanism in both sets was of the same character, consisting of yield lines and tension fields, both in the web and in the flanges, so that it was classified as quasi-mechanism [26].…”

“…Some parameters of the mechanism (among them ζ in Fig. 8 - [34]) should be determined (calibrated) on the basis of an experiment. The calibration of the mechanism model was performed for two sets of perforations separately.…”

“…Detailed geometrical relations of this mechanism (particularly yield lines lengths l i and rotation angles β i in relation ( 4)), as well as membrane strain energy E mj in tension fields (rel. 10) are given in [34].…”

“…8. Theoretical plastic mechanism model [34]; for better visibility of the figure tension fields □AGHB, □ICJD are not shadowed sciENcE aNd tEchNology shortening diagrams (analytical pre-buckling path and post-ultimate curve) together with FEA and experimental load-shortening diagrams are shown in Figure 10. The upper bound l-c-c estimation is indicated with the arrow.…”