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单跨和多跨曲轴梁桥的实用设计,要求一种简捷有效和经济的分析过程,能在承受广义荷载下,获得对结构反应的深入理解。本文,将薄壁梁理论直接与有限元技术相结合,演引出一种新的薄壁箱梁单元。这种箱梁单元除计及剪切变形外,还在6个自由度的初等梁的公式上,增加了三个附加自由度,以考虑翘曲和畸变效应。梁单元可以在空间弯曲并可具有变化的剖面。通过与三维壳体单元的分析结果,微分方程组解以及试验实测值进行比较,说明薄壁箱梁单元的工作性能是良好的。
The practical design of single-span and multi-span crankshaft girder bridges requires a simple, effective, and economical analysis process that can gain a deeper understanding of structural reactions under generalized loads. In this paper, the theory of thin-walled beams is directly combined with the finite element technique, and a new thin-wall box beam element is presented. In addition to the shear deformation, this box girder element also adds three additional degrees of freedom to the formula for the initial beam of 6 degrees of freedom to account for warping and distortion effects. Beam elements can be curved in space and have varying profiles. Comparing with the analysis results of the three-dimensional shell elements, the solutions of the differential equations and the experimental measured values, it is shown that the working performance of the thin-wall box beam elements is good.