Research on finite element model simplification of continuous welded rail for small radius curved girder bridge
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.
small radius curved beam bridgecontinuous welded railfinite element modellongitudinal additional forceEuclidean distance
万方数据
维普
