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对板桁组合钢梁进行非线性有限元分析。用有限个横向条带法构造了板桁组合结构极段考虑局部屈曲的空间位移模式。基于三维连续体的虚功增量方程,导出了横向条带板段单元U.L列式,用空间欧拉坐标变换考虑其位形变化,用截面塑性系数来考虑其材料非线性。应用所编程序,对广东西江桥原板行组合结构模型梁进行了非线性分析,并对其计算结果进行了一些试验验证。
Nonlinear finite element analysis of the plate girder composite steel beam. A finite lateral strip method was used to construct the spatial displacement model considering the local buckling in the pole segment of the plate-truss composite structure. Based on the virtual work incremental equation of three-dimensional continuum, the transverse strip plate segment U is derived. L column, the space Euler coordinate transformation to consider the change of its configuration, the plastic coefficient of cross-section to consider the material nonlinearity. The program is applied to do a nonlinear analysis on the beam of the composite structure of Xijiao Bridge in Guangdong Province. Some experimental results are also given to the calculation results.