...混合变分原理，塑性削减应力当量荷载， 悬链线斜拉索 [gap=4154]Key words】 cable-stayed bridge； thin-walled box girder； hybrid variation principle； equivalent load of cut-down plastic stress； catenary cable；..
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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
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