# EFFECTIVE SECTION METHOD APPLICATION TO COLD-FORMED STEEL LIPPED ANGLE COLUMNS

## Palavras-chave:

Compression, Lipped Angles, Effective Section## Resumo

In the structural design of the cold formed sections, the procedures described in NBR

14762:2010 are adopted. The Brazilian standard establishes three bar design methods: Direct Strength

Method (DSM), Effective Section Method (ESM), and Effective Width Method (EWM). The DSM is

developed by calculating the geometric properties of the gross section. In the ESM, the local buckling

is considered through the effective section obtained directly, and not by the calculation of the effective

widths of its elements, as in the case of the traditional Effective Width Method (EWM). The

dispensation of numerical methods for elastic stability analysis constitutes a certain advantage of the

ESM in relation to the DSM. For cold formed steel section on compression, an important step is to

obtain the elastic buckling axial force, which in the case of ESM is obtained by means of an equation

that is a function of the local buckling coefficient for the complete section. The NBR 14762:2010

presents expressions of this coefficient for open sections of the type U, Z and rack, besides hollow

section. The objective of this work is to present a procedure to obtain the axial force of elastic

buckling, for lipped angles on compression, in order to complement the Effective Section Method. In

this context, an equation is present for the local buckling coefficient for lipped angle, as a function of

the geometric properties of the cross section.