The Mechanical Analysis Of Speed-up Of Existing Prestressed Concrete Simple T-Beam Bridge And Design Optimization

Prestressed concretes simple supported T-beam bridge is one of widely-used bridge types in railway bridge constructions in china beacous of its many good behaviours. Present, following deeply developing of railway speed-up,it is discoveied that the structure stiffness and dynamic performances of the old prestressed concrete simple supported T-beam bridge are poor and insufficient according to speed-up test. Specially, the more running vehicle is high, the more structure problems are serious. If these problems are not studied and overcomed, it will affect bridge using life and train running safety.Firstly, the paper based on the bridge structure design principles and analysis methods of mechanical properties, 32 m prestressed concrete simple T-beam for example, the establishment of its static and dynamic analysis of ANSYS FEM model Calculation of the standard rail structures under load stress and deflection, analyze its structural strength satisfied with the design requirements. and the judgement of structural response and the train operating speed relationship by calculating moving loads of structural dynamic response. Meanwhile structure vibration frequency of analysis and evaluation.Secondly, the thesis makes a preliminary study on prestressed concrete T-beam structure optimization. The new bridge design optimization technology in the design of the railway bridge is paid the increasing attention Based on the structural parameters of design ideas, Finite element analysis modeling parameters, the method can be adjusted quickly design parameters of the new model.Finally, the thesis contrast the static and dynamic characteristics of prestressed concrete T-beam structure before and after the optimization, draw a conclusion that the design and construction of certain reference value.