梁拱组合体系桥整体节点有限元分析方法对比研究

Comparative study on finite element analysis methods of integral node in combinatorial bridge with beam and arch

采用基于力边界条件的节段模型分析方法、基于位移边界条件的节段模型分析方法以及多尺度模型分析方法,对大跨度梁拱组合体系桥梁中的某个整体节点进行有限元仿真分析,并结合现场试验,分析该整体节点的力学性能,对比研究梁拱组合体系桥梁复杂整体节点结构有限元分析方法。研究结果表明:各测点的理论值与实测值差异大多在20%以内,较为吻合;由于整体节点的处理方式不同,导致整体节点的节段模型计算结果与多尺度模型计算结果有所差异;对于复杂梁拱组合体系桥梁局部结构分析,多尺度模型分析方法能够较准确的描述其实际状态和刚度,具有较高的分析精度。

The finite element models of integral joint plate in combinatorial bridge with beam and arch were established based on the method of segmental model and multi-scale model. Combined with the static loading test, the mechanical performance of the integral joint plate in each calculation mode was compared and analyzed. The research results show that the difference rate of the calculated value and measured value is mostly within 20%;due to the different processing modes of the integral node, the calculation result of the integral node's segmental model is different from that of the multi-scale model;compared with segmental model, the multi-scale model can describe the actual state and stiffness of complex structures in combinatorial bridge with beam and arch more accurately, and has higher analytical accuracy.