京沪高速铁路津沪联络线矮塔斜拉桥设计

Design of an Extradosed Bridge on Tianjin-Shanghai Link Line of Beijing-Shanghai High-Speed Railway

京沪高速铁路天津枢纽工程中的一座三塔四跨铁路预应力混凝土矮塔斜拉桥采用了分丝管索鞍、环氧喷涂钢绞线斜拉索等技术。为了验证整体结构及局部构造的安全可靠性,对该桥进行了整体静力计算、局部应力分析、动力特性分析、抗震性能分析以及车-桥耦合动力分析,对索塔节段及索鞍构造进行了模型试验。分析和试验的结果表明,该桥结构体系满足铁路行车安全及舒适性要求,分丝管索鞍、环氧喷涂钢绞线斜拉索可以应用于铁路矮塔斜拉桥。

To a three-pylon and four-span prestressed concrete railway extradosed bridge of the Tianjin Terminal Project of Beijing-Shanghai High-Speed Railway, the techniques of strand deviating saddles and epoxy-coated steel wire strand stay cables were applied. To verify the safety and reliability of the global and local structures of the bridge, the global static of the bridge was calculated and the local stress, dynamic characteristics, seismic performance and the train-bridge coupling dynamic were analyzed and the model tests for the segments of the pylons and the saddle structures were carried out. The results of the analysis and tests show that the struethral system of the bridge can satisfy the safety and comfort requirements of train traveling and the strand deviating saddles and the epoxy-coated steel wire strand stay cables can be applied to railway extradosed bridges.