中南大学学报（自然科学版）2024，Vol.55Issue(3)：1023-1034,12.DOI:10.11817/j.issn.1672-7207.2024.03.016
小半径曲线梁桥的无缝线路有限元模型简化研究
Research on finite element model simplification of continuous welded rail for small radius curved girder bridge
摘要
Abstract
In order to establish the finite element model of continuous welded rail(CWR)of small radius curved beam bridge more easily,reduce the calculation cost and ensure the calculation accuracy,the models with different simplification degrees were compared and analyzed.Firstly,according to the form of CWR model on the bridge in the existed research,through simplified the bridge superstructure to varying degrees,six models were established from simple to complex,including single rigid arm model,multi rigid arm model,quasi grillage model,plane shell model,spatial shell model and solid model.The key parameters of each model were obtained through the lateral and longitudinal resistance tests of fasteners.Secondly,taking the(40+50+50+40)m continuous beam bridge with a curve radius of 200 m as an example,the results of CWR under conditions such as expansion,bending,braking and rail breaking were calculated.Finally,based on the calculation results of the solid model,the results of the first five models were compared with those of the solid model,and the calculation accuracy of each model was quantitatively analyzed by Euclidean distance.The results show that considering the complexity and calculation accuracy of the model,the multi rigid arm model and the quasi grillage model are more cost-effective than the spatial shell model.The grillage method is widely used in the calculation of special-shaped bridges in bridge engineering,and the bearing distribution and boundary conditions are more in line with the actual situation.It is recommended to use the quasi grillage model in the calculation of CWR of small radius curved beam bridges.关键词
小半径曲线梁桥/无缝线路/有限元模型/纵向附加力/欧几里得距离Key words
small radius curved beam bridge/continuous welded rail/finite element model/longitudinal additional force/Euclidean distance分类
交通工程引用本文复制引用
唐启辉,曾志平,李秋义,尹华拓,李平,刘卓,张天琦..小半径曲线梁桥的无缝线路有限元模型简化研究[J].中南大学学报（自然科学版）,2024,55(3):1023-1034,12.基金项目
中国铁路南昌局集团有限公司科技研究开发计划课题(202007)(Project(202007)supported by Research and Development Plan Program of China Railway Nanchang Bureau Group Co.Ltd.) （202007）
