铜陵长江大桥无砟轨道车线桥动力性能研究  

Research on Train-Track-Bridge Dynamic Performance of Tongling Yangtze River Bridge with Ballastless Track

作　　者：高芒芒[1] 熊建珍[1] 孙加林[1] 

机构地区：[1]中国铁道科学研究院铁道科学技术研究发展中心,北京100081

出　　处：《中国铁道科学》2012年第B08期69-75,共7页China Railway Science

基　　金：铁道部科技研究开发计划项目（2019G018-D-1）

摘　　要：铜陵长江大桥主桥为90m＋240m＋630m＋240m＋90m的5跨公铁两用连续钢桁梁斜拉桥，大桥下层为设计时速250km的合福客专双线和时速160kin的合庐铜Ⅰ级线路双线共四线铁路。为考察大跨度钢桥上铺设无砟轨道的适应性，针对铜陵长江大桥和桥上无砟轨道初步设计方案进行车线桥动力性能研究。结果表明：铜陵长江大桥在铁路桥面受力较大区域采用正交异性钢箱结构，能显著增强横断面的横向和扭转刚度，使得各跨桥梁的变形曲线较为平缓，梁端局部区域未出现明显的变形差异，且梁端压重有效降低行车条件下的桥面振动加速度，因而具备铺设无砟轨道的刚度条件；从行车安全角度，建议双块式无砟轨道道床板下减振垫层的刚度取0．1N·mmm^-3；轴重较大的列车通过时，几乎所有的道床板在边支点附近均发生与桥面脱离的现象，而高速列车通过时，只有中跨跨中附近的道床板在边支点附近出现与桥面脱离的现象，且减振垫层刚度的差异对这种道床板与桥面脱离的现象影响不大。Tongling Yangtze River Bridge is a 5-span combined highway and railway cable-stayed bridge with continuous steel truss beam. The overall length of its main bridge is 90 m＋240 m＋630 ＋240 m＋ 90 m. The lower layer is He-Fu PDL double-track with 250 km· h^-1 designed speed and Lu-Tong passen- ger/freight mixing double-track with the speed of 160 km· h^-1. In order to investigate the adaptability for laying ballastless track on large span steel bridge; the dynamic performances of Tongling Yangtze River Bridge and corresponding ballastless track were studied based on preliminary design. Results show that, since orthotropic steel box structure is adopted for the important region, the lateral and torsional stiffness of cross section is obviously strengthened, the transformation curve is gentler and significant deformation diversity does not occur at the region near the beam end. At the same time, the additional pressure which is distributed in the first panel can effectively decrease deck acceleration under high-speed train. Accord- ingly, Tongling Bridge meets the rigidity requirement for applying ballastless track. From the point of view for running safety, the stiffness of rubber tie-plate in bi-block ballastless track is proposed as 0. 1 N · mm^-3. The analysis shows that instant divorce occurs between almost all the rubber tie-plate and the deck when heavy train passes, and the same phenomenon only occurs in the centre region of the middle span when high-speed train passes. Moreover, changing the stiffness of rubber tie-plate in ballastless track has little influence on such instant divorce.

关 键 词：公铁两用桥 斜拉桥 钢桁梁 无砟轨道 双块式 车线桥 动力性能 

分 类 号：U441.7[建筑科学—桥梁与隧道工程]