Shear buckling coefficients of web panels for composite girders considering flange-web stiffness ratio

Daehyeok Kim, Siyoung Cho, Young Jong Kang, Keesei Lee, Jeonghwa Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Designing a web panel for composite girders necessitates an accurate evaluation of the shear buckling strength. However, the current design specifications calculate the strength of web panels for composite girders conservatively. Additionally, its rational determination is missing in existing studies. This study investigates the shear buckling coefficients of composite girders through numerical analysis. The numerical analysis model assumes that the concrete slab fully restrains the web panel. In addition, the concrete slab of the composite girders in the numerical analysis model is replaced by equivalent top flange sections using a transformed thickness according to the modular ratio (n) of the concrete and steel. Additionally, the stiffness of the bottom flange and web panel is parameterized to evaluate the effect of their relative stiffness on the critical shear buckling strength of the web panel. The results show that the relative stiffness of the flange and web panel significantly affects the shear buckling coefficient. To determine the shear buckling coefficient by reflecting these structural characteristics, the relative stiffness is defined as the ratio of the torsional stiffness of the flange to the flexural stiffness of the web panel. The proposed formulas for the shear buckling coefficient of web panels for composite girders correlate well with the numerical analysis results. Since the accurate shear buckling strength can be derived from these formulas, the web panel for composite girders can be designed more accurately and economically.

Original languageEnglish
Article number110005
JournalThin-Walled Structures
Publication statusPublished - 2022 Dec

Bibliographical note

Funding Information:
This study was supported by a grant provided by POSCO Corporation, Korea . The authors wish to express their gratitude for the financial support.

Publisher Copyright:
© 2022 Elsevier Ltd


  • Composite girders
  • Critical shear buckling
  • Shear buckling coefficient
  • Stiffness ratio

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering


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