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根据李国豪的桁梁扭转理论,本文提出了一种计算桁梁桥的梁单元有限元法。在此基础上,分析了两种类型的铁路简支钢桁梁桥,特别是其横联的力学功能,归纳得到了横联剪力H的实用计算公式。为了验证梁单元有限元法的可靠性,本文除介绍了一个模型试验的结果之外,还与空间杆系有限元法的计算结果进行比较。结果表明,本方法有足够的精度.
According to Li Guo-hao theory of truss girder torsion, this paper presents a beam element finite element method for truss girder bridge. On this basis, the two types of railway simply supported steel truss girder bridge are analyzed, especially the mechanical function of the transverse cross-linked steel truss girder bridge, and the practical formula of transverse shear force H is summarized. In order to verify the reliability of finite element method of beam element, this paper compares the result of a model test with the result of finite element method of space rod. The results show that this method has enough accuracy.