Modeling systems of unsymmetrical sections as doubly symmetric - How much does it matter?

Ronald D. Ziemian, Si Wei Liu, Siu Lai Chan

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

Abstract

Unsymmetrical sections are commonly used in thin-walled metal structures for the optimal utilization of materials and fast production. The members with these sections are usually slender and susceptible to lateral-torsional or flexural-torsional buckling, and furthermore, their structural behaviors are often complex because the shear center doesn't coincide with the centroid. Although conventional warping beam-column elements can simulate these buckling modes, they are derived based on the assumption of a doubly-symmetric section. It would be unreliable for to use these conventional elements when evaluating the buckling strength of an unsymmetrical slender section. Against this background, a refined warping beam-column element for unsymmetrical sections is derived by the authors and implemented within the educational structural analysis software MASTAN2 (v4.0). This paper reviews the essential theory and the development of element formulations with several benchmark examples that demonstrate accurate results from the proposed numerical framework. These examples are also analyzed by the conventional warping elements for assessing the impact of modeling members of unsymmetrical sections as doubly symmetric.

Original languageEnglish
Title of host publicationProceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018
EditorsSiu Lai Chan, Tak-Ming Chan, Songye Zhu
PublisherHong Kong Institution of Steel Construction
ISBN (Electronic)9889914093, 9789889914097
DOIs
Publication statusPublished - Dec 2018
Event9th International Conference on Advances in Steel Structures, ICASS 2018 - Hong Kong, China
Duration: 5 Dec 20187 Dec 2018

Publication series

NameProceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018

Conference

Conference9th International Conference on Advances in Steel Structures, ICASS 2018
Country/TerritoryChina
CityHong Kong
Period5/12/187/12/18

Keywords

  • Buckling
  • Elements
  • Geometric Nonlinear Analysis
  • Open Sections
  • Steel
  • Thin-walled
  • Wagner Effects
  • Warping

ASJC Scopus subject areas

  • Metals and Alloys
  • Civil and Structural Engineering

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