Intermediate Stiffeners in Cold-Formed Profiled Steel Decks. Part 1. 'V' ShapedStiffeners

摘要

A program of tests to determine the effectiveness of intermediate stiffeners incontrolling buckling modes has been undertaken. A series of specimens were loaded in pure bending resulting in various buckling waveforms prior to ultimate failure through a plastic collapse mechanism. All specimens were brake-pressed to designs that were chosen to ensure that the primary buckling took place in the elastic range and was not affected by plasticity. The experimentally determined buckling stresses were found to be comparable with studies performed using a computer analysis based on the finite strip method in which both local and distortional buckling modes were predicted. The test rig developed for the program successfully approximated the boundary conditions implicit in the numerical model and prevented premature failure due to localized stressing at the specimen ends. A simplified design procedure for distortional buckling is proposed. The existing design procedure for local buckling in the Australian Standard AS1538-1988 is confirmed.