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In this contribution, a semi-analytical solution and two numerical models are applied to a thin-walled reinforced concrete (RC) beam in order to estimate its torsional moment strength in fire conditions. The semi-analytical solution and one of the numerical models rely on computing the shear strength of the four walls of the beam separately, while the second numerical model is applied to the whole cross-section considering the walls joined at the corners. The three methods are compared to each other, before being compared with an experimental result found in the literature. The comparison with the experimental result is given for several values of the effectiveness factor for the compressive strength of concrete in order to assess the relevance of the finite-element models and, indirectly, the semi-analytical solution for the torsional design of thin-walled RC beams.

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Evaluation of the Torsional Strength of Thin-Walled RC Beams in Fire Conditions

  • 章节

  • 发表日期：

    2026年

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  • Sabine Boulvard,
  • Duc Toan Pham,
  • Jérémy Bleyer

摘要

In this contribution, a semi-analytical solution and two numerical models are applied to a thin-walled reinforced concrete (RC) beam in order to estimate its torsional moment strength in fire conditions. The semi-analytical solution and one of the numerical models rely on computing the shear strength of the four walls of the beam separately, while the second numerical model is applied to the whole cross-section considering the walls joined at the corners. The three methods are compared to each other, before being compared with an experimental result found in the literature. The comparison with the experimental result is given for several values of the effectiveness factor for the compressive strength of concrete in order to assess the relevance of the finite-element models and, indirectly, the semi-analytical solution for the torsional design of thin-walled RC beams.