Experimental and analytical study of horizontally curved i-girders subjected to equal end moments

Jeonghyeon Lim, Young Jong Kang, Jeonghwa Lee, Seungjun Kim, Keesei Lee

Research output: Contribution to journalArticlepeer-review


If bending and torsional moments are applied to an I-shaped beam member, the coupling of those two forces could reduce the bending moment capacity of that member. Therefore, the interaction between bending and torsional moments is an important issue for horizontally curved members that are always simultaneously subjected to bending and torsion. In this study, the behavior of the horizontally curved steel I-beam was investigated through numerical analysis. The ultimate state of sharply curved members that showed large displacement was defined in accordance with the stiffness reduction ratio to consist of strength curves. Based on the analysis results, interaction curves were established, and a strength equation was derived. The uniform torsional moment capacity, curvature, and slenderness parameters were considered in the equation, which were the main factors that affected the ultimate strength of curved members. The curvature effect was considered individually, so that the strength of the straight or curved girder could be estimated with a unified equation. To verify the accuracy of the suggested equation, experimental studies were also conducted. Consequently, the suggested equation shows very good agreement with the test results, and is expected to provide useful information for the design of curved members.

Original languageEnglish
Article number1132
Issue number7
Publication statusPublished - 2021 Jul


  • Curved
  • Experiment
  • Interaction
  • Nonlinear
  • Strength
  • Torsion

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys


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