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本文将梯形桁梁桥的斜桥门架节间作为动态子结构,计算组成其非满秩的模态矩阵[Φ],然后通过线性变换得到该子结构相应于模态坐标的刚度阵和质量阵;对于中间桁梁段则用桁梁梁段单元进行处理。最后,通过斜桥门架子结构与相邻桁梁梁段单元相接界面上的几何关系,将斜桥门架动态子结构与桁梁梁段单元相结合,即得到梯形桁梁桥挠曲扭转振动分析的子结构与梁段单元相结合的有限元方法。文中给出了算例,并将结果与SAP5的结果进行了比较。结果表明,该方法具有很好的精度。
In this paper, the diagonal bridge gantry in-trapezoid bridge is used as a dynamic substructure to calculate the modal matrix [Φ] which forms its non-full rank, then the stiffness matrix and mass of the substructure corresponding to modal coordinates are obtained by linear transformation For the middle truss section, the truss beam section unit is used for processing. Finally, the dynamic substructure of the gantry bridge is combined with the grate beam element by the geometric relationship between the slant-bridge gantry structure and the interface of the adjacent grate beam elements to get the flexural torsion of the trapezoidal girder bridge Finite element method combining vibration substructure with beam segment element. An example is given in the paper, and the result is compared with the result of SAP5. The results show that the method has good accuracy.