6TH International Congress on Technology - Engineering - Kuala Lumpur3 - Malaysia (2018-07-19)

Effect Of Screw Spacing On The Axial Strength Of Back-to-back Built-up Cold-formed Lean Duplex Un-lipped Channel Sections

This paper presents a numerical investigation into the behaviour of back-to-back built-up cold-formed lean duplex un-lipped channels under compression. The finite element model includes materials non-linearity and geometric imperfections. A comprehensive parametric study has been carried out covering a wide range of length and different cross section geometries to assess the performance of the current design guidelines by AISI and AS/NZS. In total, 78 finite element models were analysed. Spacing between the fasteners were varied to understand the effect of screw spacing on the axial strength of back-to-back built-up lean duplex un-lipped channels. From the results of parametric study, it was found that the current design guidelines are conservative by around 22% for columns failed through overall buckling, however, design standards were un-conservative by around 10% for columns failed through local buckling.
Krishanu Roy, Tina Chui Huon Ting, Hieng Ho Lau, James B.P. Lim