重载铁路小跨径混凝土桥梁运营性能研究

Operation Performance Evaluation Study of Small Span Concrete Bridge Under Heavy Load Railway Transportation

重载铁路运输的快速发展提高了铁路的运输能力和经济效益,但列车轴重提高和编组增加给既有铁路桥梁带来了严重的影响。采用现有标准设计的桥梁结构,虽然在一定程度上可以满足列车运营要求,但也暴露出小跨度桥梁承载能力不足、桥梁横向振动偏大等危及列车安全的问题。以重载运输条件下小跨径混凝土简支梁桥为研究对象,通过理论计算分析,结合桥梁运营性能试验,对桥梁的受力特点和运营性能进行系统地研究。

The rapid development of railway heavy haul transportation improves the railway＇ s traction weight and economic benefit, but the increased train axle load and the train formation bring serious influence to the ex- isting railway bridge. Although the bridge designed by the current standard can meet the requirements of the train operation in a great degree, the small span bridge＇ s disadvantages such as insufficient bearing capacity, o- ver - large lateral amplitude and so on are exposed, which jeopardize the safety of the train. With the research project of small span concrete bridge under the condition of heavy haul transportation, the dissertation systemati- cally studies the bridge＇ s stress characteristics and operation state applying the methods of calculation analysis and operation performance experiment.