Reliability analysis of cold formed steel members with plain C-lipped and SupaCee section in shear

Resumo

This article presents a procedure for the reliability assessment of cold-formed steel members with plain
C-lipped and SupaCee® sections in shear. The SupaCee® sections contain additional return lips and web stiffeners

which enhance the bending and shear capacity of the sections. The development of the DSM for designing of cold-
formed sections in pure shear is available in North American (AISI) and Australian (AS/NZS 4600) standards.

However, the Brazilian standard does not provide the application of the DSM for shear case. A test database of 23
cold-formed steel members in shear was assembled and test-to-predicted statistics were obtained for the Direct
Strength Method (DSM). The reliability indexes, resulting from the reliability analysis, were determined using the
First Order Reliability Method (FORM), First Order Second Moment (FOSM) and Monte Carlo Method (MCM).
It was found that the DSM safety level, adapted to the Brazilian standard, satisfies the target reliability index of
2.5 if a resistance factor of 1/1.2 is used.