Some experiences on numerical modelling of cold-formed steel lapped Z-sections

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Cold-formed steel purlins are widely adopted in building construction as supporting members of roof systems. Owing to the effective overlapping between Z-sections, they are commonly adopted to act as multi-span purlins and side rails to support building envelopes. This paper presents a systematic numerical investigation into the structural behaviour of high strength cold-formed steel lapped Z-sections under one point loads. A number of finite element models with two different element types and mesh configurations have been established with different boundary and contact conditions, and material and geometrical non-linearity has been incorporated into the finite element models together with initial geometrical imperfections. The models are calibrated against the test results of a series of lapped Zsections with different lap lengths. It is found that the maximum applied moments and the elastic deformation characteristics predicted by the models with both thin degenerated 4- noded shell elements and continuum 8-noded shell elements are very close to the measured results. However, only the numerical models using continuum 8-noded shell elements are able to give close predictions to the deformation characteristics of continuous Z-sections at very large deformations. Hence, with suitable boundary and contact conditions, the finite element models using continuum 8-nodoed shell elements are shown to be highly effective in assessing the structural behaviour of lapped Z-sections with different lap lengths along their entire deformation ranges.
Original languageEnglish
Title of host publicationICASS '09/IJSSD - Proceedings of Sixth International Conference on Advances in Steel Structures and Progress in Structural Stability and Dynamics
Pages488-497
Number of pages10
Publication statusPublished - 1 Dec 2009
Event6th International Conference on Advances in Steel Structures and Progress in Structural Stability and Dynamics, ICASS 2009 - Hong Kong, Hong Kong
Duration: 16 Dec 200918 Dec 2009

Conference

Conference6th International Conference on Advances in Steel Structures and Progress in Structural Stability and Dynamics, ICASS 2009
Country/TerritoryHong Kong
CityHong Kong
Period16/12/0918/12/09

Keywords

  • Cold-formed steel
  • Finite element method
  • Lapped connections
  • Numerical modelling
  • Purlins
  • Z-sections

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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