Experimental and Numerical Investigations of S690 High-Strength Steel Welded I-Sections under Combined Compression and Bending

Yao Sun, Yating Liang, Ou Zhao, Ben Young

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


This paper presents a comprehensive experimental and numerical investigation into the cross-section behavior and resistances of S690 high-strength steel welded I-sections under combined compression and bending moment. First, a testing program was carried out and included initial local geometric imperfection measurements and ten major-axis and minor-axis combined loading tests. The testing program was followed by a numerical modeling program, where finite-element models were developed and validated against the test results and then used to perform parametric studies to generate further numerical data over a wide range of cross-section dimensions and loading combinations. On the basis of the test and numerical data, the codified interaction curves for S690 high-strength steel nonslender welded I-sections under combined loading, as used in Europe, Australia, and the US, were evaluated. The evaluation results revealed that (1) the European code yields accurate resistance predictions for S690 high-strength steel Classes 1 and 2 welded I-sections under both major-axis and minor-axis combined loading but underestimates the resistances for their Class 3 counterparts, (2) the Australian standard leads to a high level of conservatism for S690 high-strength steel nonslender welded I-sections under combined loading, and (3) the American specification can well predict the resistances for S690 high-strength steel nonslender welded I-sections under major-axis combined loading but results in conservative resistance predictions for those under minor-axis combined loading. The reliability of the codified interaction curves was also evaluated by means of statistical analyses.

Original languageEnglish
Article number04021054
JournalJournal of Structural Engineering (United States)
Issue number5
Publication statusPublished - 1 May 2021


  • Combined loading test
  • Design standard
  • Interaction euqation
  • Local buckling
  • Numerical modeling
  • Reliability analysis
  • S690 high-strength steel
  • Welded I-section

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this