CAPACIDADE RESISTENTE DE COLUNAS CONTRAVENTADAS EM PERFIS FORMADOS A FRIO COM PERFURAÇÕES

Resumo

The use of cold-formed profiles, due to its versatility, economy and lightness, has been
increasingly incorporated into the civil construction. The workability found in the thin-walled sections
allows a great variety of cross sections, allowing its use in several segments. One of these uses is in
the Industrial Storage Systems, usually called racks, in which the cold-formed steel profiles are used in
most elements, including the uprights. These uprights have perforations along the length, in order to
facilitate the assembly of the system as a whole. The objective of this work is to evaluate the influence
of the perforations and the arrangement of bracings in the ultimate load of pinned uprights under axial
compression, with lengths in which the distortional buckling mode is dominant. The analyzed cross
sections are of the rack type, commonly used in these systems. Numerical studies were carried out
using ANSYS commercial program, calibrated with results of experimental program. An elastic
stability analysis was performed in the ANSYS and in conjunction with a modification of the Direct
Strength Method proposed by the authors, were obtained the ultimate loads that were compared to the
experimental results.