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The lateral-torsional buckling occurs in a beam when the beam’s unsupported length is greater. The beam will fail by lateral-torsional buckling when the compression flange is free to rotate and displace laterally. The lateral stability of the I-section is an important factor in the design of pre-engineered buildings. The design to resist the bending and twisting in the frame I-section, that is, rafter and column, in lateral direction flange bracing, acts as a restraint to resist lateral-torsional buckling. The top flange is connected with purlins to act as a lateral restraint. The bottom flange torsional moment is resisted by flange bracing. Increasing the flange bracing decreases the unsupported length of the compression flange, so there is a decrease in lateral-torsional buckling. If the non-dimensional slenderness ratio (λlt) is less than 0.4, the section is said to be laterally supported, according to IS 800. This study discusses how lateral-torsional buckling affects when restraints are applied at different intervals and how the section is impacted when the flange width, thickness, web depth, and thickness change.

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Lateral Torsional Buckling Effect on I-Section with Flange Bracing As Per IS 800:2007

  • 会议论文

  • 发表日期：

    2026年

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  • Hamsashree,
  • D. Venkata Praneeth,
  • Shreelaxmi Prashant,
  • Poornachandra Pandit,
  • Mohammad Rahmatulla,
  • Prabhu Gurunathappa Sheelavantar,
  • G. S. Gana

摘要

The lateral-torsional buckling occurs in a beam when the beam’s unsupported length is greater. The beam will fail by lateral-torsional buckling when the compression flange is free to rotate and displace laterally. The lateral stability of the I-section is an important factor in the design of pre-engineered buildings. The design to resist the bending and twisting in the frame I-section, that is, rafter and column, in lateral direction flange bracing, acts as a restraint to resist lateral-torsional buckling. The top flange is connected with purlins to act as a lateral restraint. The bottom flange torsional moment is resisted by flange bracing. Increasing the flange bracing decreases the unsupported length of the compression flange, so there is a decrease in lateral-torsional buckling. If the non-dimensional slenderness ratio (λlt) is less than 0.4, the section is said to be laterally supported, according to IS 800. This study discusses how lateral-torsional buckling affects when restraints are applied at different intervals and how the section is impacted when the flange width, thickness, web depth, and thickness change.