人字形桥梁由于采用了薄壁箱梁结构，其约束扭转、畸变效应及剪力滞比较突出。
The adoption of the thin-walled box girder to the Y-shape bridge makes the restrained torsion effect, distortion effect and shear lag effect prominent.
本文利用变分有限元法、样条函数等，提出了薄壁箱梁结构分析的数值理论和方法。
This dissertation establishes numerical methods in structural analysis on the basic of variation principle, finite member element method, spline function, etc.
对薄壁箱梁结构模糊分析的数值计算理论进行深入研究，提出了基于一维离散有限元法的薄壁箱梁模糊分析理论。
The numerical methods of fuzzy analysis for thin-walled box girders are studied systematically, the one-dimensional fuzzy finite element method for thin-walled box girders is proposed.
箱形薄壁梁是桥梁工程中经常采用的结构。
多室薄壁箱梁是超静定结构，求解其超静定未知剪力流是一个难点。
Multichambered Thin-walled box girder is a hyperstatic structure, it is a difficulty to solve its hyperstatic unknown shearing flow.
利用薄壁结构理论对组合箱梁进行扭转分析，分别给出了相应的分析方法和计算公式。
According to thin-walled structure theory, torsional analysis of the composite box beams was carried out, and the analytical method and calculation formula were presented corresponding.
对于宽幅、薄壁的扁平型钢箱梁结构的分析，需借助通用有限元程序对结构进行空间分析。
Refer to the analysis ot the wide, thin-walled flat steel box girder, it need the space analysis with the general finite element program.
对于宽幅、薄壁的扁平型钢箱梁结构的分析，需借助通用有限元程序对结构进行空间分析。
Refer to the analysis ot the wide, thin-walled flat steel box girder, it need the space analysis with the general finite element program.
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