With the large-scale construction of railways,small angle skew crossing between lines is inevitable.With the limited clearance under the bridge,the commonly used portal rigid frame scheme is not applicable.In this paper,based on the project of Xi'an East Railway Station crossing the Xi'an to Shiyan high speed railway main line,the portal pier is combined with the small T-frame beam,and the spatial special-shaped T-frame bridge is used to meet the requirements of small-angle skew crossing between the lines under the condition of limited headroom.The finite element models such as the three-dimensional whole model,the longitudinal calculation model and the local model of the beam are established.Through the co MParison of different models,the calculation methods of the longitudinal and transverse forces of the T-frame bridge with different forms are analyzed.The applicability of the longitudinal model and the local beam model is demonstrated,and the stiffness of the local beam model is modified.The local beam model with modified stiffness is proposed.The modified beam local model has clear force,and the calculation results are consistent with the three-dimensional space model,which can meet the design calculation requirements.
维普
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