...国土木工程学报 关键词：薄壁箱梁；曲线箱梁；剪滞效应；二次剪切变形；能量变分法 [gap=1552]Keywords: thin-walled box girder; curved box girder; shear lag effect; secondary shear deformation; energy varia..
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A two-node spatial non-linear thin-walled box girder element isput forward, which is based on Hellinger-Reissner hybrid variation principle. The non-linear FEM (finite element method) equation, elastic rigidity matrix, geometry matrix and pre-stress load column matrix were formulated.
2、提出了基于Hellinger-Reissner混合变分原理的两节点空间非线性薄壁箱梁单元，推导了增量形式的几何非线性有限元方程、弹性刚度矩阵、几何刚度矩阵、初应力荷载阵等的计算公式。
参考来源 - 薄壁箱梁混合单元及其在斜拉桥双重非线性分析中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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.
因而对于大跨径箱梁桥特别是多室薄壁箱梁进行进一步的探索，是很有必要的。
So it is necessary to do some further researches in thin-walled box girder, especially in multichambered thin wall box girder.
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.
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