AI Article Synopsis

  • An experimental study investigated the lateral-torsional buckling of two-branched beams made from cold-formed channel members, focusing on the elastic critical load.
  • The tests involved varying bolt spacings in the built-up beam models, revealing that fewer bolts (three) led to lower critical load capacities and more non-linear behavior, while increasing bolts beyond seven offered no further benefits.
  • The critical load measurements were found to be 15 to 23% lower than predictions made using finite element methods for similar uniform I-section elements, indicating differences in structural behavior.

Article Abstract

In an experimental study of two-branched beams bent transversely about the major stiffness axis, the elastic critical load from the lateral-torsional buckling condition was determined. The tests were conducted on simply supported two-branch beam models with a built-up section consisting of two cold-formed channel members (2C) bolted back-to-back. The bolts were located at the mid-height of the built-up cross-section. Five groups of members differing in longitudinal bolt spacing were examined. The models were gravitationally loaded (using ballast) at the centre of the beam span. This approach eliminated the undesirable effect of the lateral support of the beam, e.g., by the actuator head. The critical load, measured by the concentrated transverse force (), was determined using the modified Southwell method. It has been experimentally shown that, in built-up beams, there is an influence of bolt spacing on the elastic critical load from the lateral-torsional buckling condition. The lowest critical load capacity and the most non-linear behaviour of the built-up member were observed in beams bolted with only three bolts (at the supports and in the middle of the span). However, the experimental results obtained in this study show that increasing the number of bolts above a certain level (in the case of the tested models, it was seven bolts) does not result in a further increase in the critical load, which is a surprising result. The obtained values were 15 to 23% lower than the critical load determined numerically by the finite element method () for an analogous element with a uniform I-section.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11278395PMC
http://dx.doi.org/10.3390/ma17143392DOI Listing

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