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针对内外法兰在拉弯荷载下的力学行为及承载力计算方法进行研究。基于平截面假定推导了半解析计算方法,并将该方法的计算结果与非线性有限元分析结果进行了比较验证。通过研究旋转轴、中性轴和承载力随轴向拉力变化,揭示了其在拉弯荷载下的受力特征。最后对一系列内外法兰的承载力进行计算和分析,总结了拉弯荷载下的设计计算方法。研究表明,内外法兰的抗弯承载力随拉力的增加而减少。与有限元分析相比,半解析计算方法具有足够的计算精度,更高的计算效率。论文所提出的设计计算方法较传统刚性法兰承载力计算理论更为准确和可靠,为内外法兰设计计算提供了依据。
Aiming at the mechanical behavior and bearing capacity calculation method of internal and external flanges under tension and bending load, Based on the assumption of flat section, the semi-analytical method is deduced, and the results of the method are compared with the results of nonlinear finite element analysis. By studying the rotation axis, the neutral axis and the bearing capacity change with the axial tensile force, reveals the force characteristics under the bending load. Finally, the bearing capacity of a series of internal and external flanges is calculated and analyzed, and the design and calculation method under tension and bending load is summarized. The results show that the flexural capacity of flanges decreases with the increase of tensile force. Compared with the finite element analysis, the semi-analytical method has sufficient calculation accuracy and higher computational efficiency. The design method proposed in the paper is more accurate and reliable than the calculation theory of the bearing capacity of the traditional rigid flange, which provides the basis for the design calculation of the inner and outer flanges.