Abstract:Taking the prefabricated pier of newly built Hetian-Ruoqiang Railway as the research object, the influence of the structural design of railway prefabricated pier on its structural rationality, safety and economy under the load is studied. The current national railway bridge and culvert design codes are adopted to carry out the combined loading of superstructure dead weight, second stage and train braking force for the prefabricated hollow piers. According to the factors controlling the different wall thickness of hollow pier, the different prestressed beam number and the different pier post-pouring section height, and based on MIDAS CIVIL software, the loading model of pier is established to obtain the displacement and bending moment changes of three different control factors at the key points of pier top, pier bottom and pier body. The research shows that the pier wall thickness if designed on 45 cm can satisfy the design requirements of practice engineering of Hetian-Ruoqiang Railway. At the same time, the greater safety and stability are can also be achieved. Compared with the wall thickness of 40 cm, the displacement can be decreased by 17.61%, the bending moment changed little and the overall structure is more economical and reasonable, which can ensure traffic safety. The prestressed beam number if designed on 12 can be enough to meet the mechanical properties of bridge piers. The structure is more economical and reasonable. The pier post-pouring section designed according to 4 m can better meet the practical engineering needs of Hetian-Ruoqiang Railway. At the same time, the security and stability of the structure are improved. The horizontal displacement of pier top is reduced by 1.61% compared with 3.2 m, which has little effect on bending moment. The theoretical guidance and reference significance are provided for the design of prefabricated pier the future through optimization.
