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<p>The deformation of bent-twist coupling (BTC) cantilever box beam subjected to a vertical force on the free end was studied theoretically. The analytical expressions for bending and twisting deformation of the BTC box beam were derived by combining force analysis with the displacement-curvature relation of each beams made up the whole box beam based on the classical laminate theory, and they were also verified very well. The influence of fiber ply angles, material properties, and the sizes of the box beam on deformation and bent-twist coupling effect was discussed in detail. It was found that the main beam has a decisive role in the BTC effect. When the main beam is glass fiber-reinforced composite, the BTC factor is maximum as fiber ply angle is 20° and when the main beam is carbon fiber-reinforced composite, the angle is 8°. The increase in the thickness, the height, and the width of the box beam all result in a decrease in vertical displacement and twisting angle on the free end, and the influence of the height is most significant. But all these sizes have little influence on bend-twist coupling factor.</p>

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Solution of Deformation of Bend-Twist Coupling Box Beam Subjected to Concentrated Force

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Shiru Shao,
  • Shuangshuang Sun,
  • Huanqi Liu

摘要

The deformation of bent-twist coupling (BTC) cantilever box beam subjected to a vertical force on the free end was studied theoretically. The analytical expressions for bending and twisting deformation of the BTC box beam were derived by combining force analysis with the displacement-curvature relation of each beams made up the whole box beam based on the classical laminate theory, and they were also verified very well. The influence of fiber ply angles, material properties, and the sizes of the box beam on deformation and bent-twist coupling effect was discussed in detail. It was found that the main beam has a decisive role in the BTC effect. When the main beam is glass fiber-reinforced composite, the BTC factor is maximum as fiber ply angle is 20° and when the main beam is carbon fiber-reinforced composite, the angle is 8°. The increase in the thickness, the height, and the width of the box beam all result in a decrease in vertical displacement and twisting angle on the free end, and the influence of the height is most significant. But all these sizes have little influence on bend-twist coupling factor.