Cross-Section Properties and Elastic Lateral-Torsional Buckling Capacity of Steel Delta Girders

Omar Y. El Masri, Eric M. Lui

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In this paper, the behavior of slender steel delta girders (SDG) is investigated both analytically and numerically. In the analytical analysis, closed-form equations for cross-section properties of SDG are derived. They are then compared with solutions obtained numerically. Using these cross-section properties, the theoretical elastic lateral-torsional buckling (LTB) strength of these girders are determined and compared with results obtained from a finite element analysis. The results show that the theoretical LTB equation derived for general open monosymmetric I-sections can be applied to these delta girders. Additionally, it is shown that a simplified expression for the coefficient of monosymmetry βx derived for I-sections can be used in the computation of LTB strength for SDG. A parametric study is then performed to demonstrate the effectiveness of SDG in achieving a favorable strength-to-weight ratio when compared to standard I-section members. Based on the results of this parametric study, it is recommended that the height and width of the delta region of the cross-section be equal to two-fifth the height of the web and three-quarter the width of the compression flange, respectively.

Original languageEnglish (US)
Pages (from-to)914-931
Number of pages18
JournalInternational Journal of Steel Structures
Issue number3
StatePublished - Jun 1 2019


  • Design guidelines
  • Finite element analysis
  • Lateral-torsional buckling
  • Steel delta girder
  • Torsional properties

ASJC Scopus subject areas

  • Civil and Structural Engineering


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