Martins, A.D.

On the Direct Strength Method (DSM) design of cold-formed steel beams experiencing local-distortional interaction

Abstract eng:
This work presents and discusses numerical results concerning the Direct Strength Method (DSM) design of cold-formed steel simply supported beams subjected to uniform bending and affected by Local-Distortional (L-D) interaction. The beams analysed exhibit (i) three cross-section shapes (lipped channels, hats and zeds) and (ii) two end support conditions (differing in the warping restraint). A systematic numerical investigation is carried out, in order to characterise the post-buckling behaviour and ultimate strength of beams experiencing more or less severe L-D interaction effects. 43 beam geometries and 11 yield stresses are considered for each combination of cross-section shape and boundary condition, thus ensuring distinct (i) ratios between the local (McrL) and distortional (McrD) critical buckling moments, such that 0.50 ≤McrD /McrL≤ 2.00, and (ii) local or distortional slenderness values, ranging from 0.50 to 3.50. The numerical results are obtained from Abaqus shell finite element analyses and concern the (i) post-buckling behaviour, (ii) ultimate strength and (iii) failure modes. Based on the acquired information, a first contribution towards the DSM design of cold-formed steel beams undergoing different “levels” of L-D interaction is presented and discussed.

Contributors:

Dinis, P.B.

Publisher:

Taylor and Francis Group, London, UK

Conference Title:

Insights and Innovations in Structural Engineering, Mechanics and Computation

Conference Title:

Sixth International Conference on Structural Engineering, Mechanics and Computation

Conference Venue:

Cape Town, South Africa

Conference Dates:

2016-09-05 / 2016-09-07