中文摘要：

高速铁路桥上无砟轨道纵连板出现了不同程度的轨道板或底座板开裂甚至断裂。本文采用有限元方法建立线-板-桥-墩一体化计算模型,对纵连板断裂条件下的梁轨相互作用予以分析。结果表明：轨道板断裂后,相邻桥跨及邻线轨道板纵向力变化较小,但断板处底座板的纵向拉力急剧增大,存在底座板断裂的风险;底座板断裂对相邻桥跨及邻线轨道板影响较大,导致轨道板及钢轨受力增大且较大范围内的CA砂浆脱黏;轨道板与底座板同时断裂对梁轨系统的影响最大,致使连续梁上钢轨受力接近其允许限值,应以此确定纵连板所能允许铺设的最大温度跨度;当一线的轨道板、底座板和钢轨均发生断裂时,另一线亦将如此,最终导致桥墩因受力超限而倾斜。

英文摘要：

Ballastless track longitudinal connected slab on high-speed railway bridge uses longitudinal continuous paving track plate and base plate and there are cracking or breaking of the track plate and the base plate in different degrees during the actual operation process. This paper established a Line-Board-Bridge-Pier integrated calculation model through the finite element method to study the girder-rail interaction under the condition of broken longitudinal connected slab. The results showed that the longitudinal force caused by broken track plate or base plate will be supported by other components of girder-rail systemwhich effects the global stability oflongitudinal connected slab ballastless track,the longitudinal force of adjacent bridge span and adjacent track slab changes little while longitudinal force in the place of broken base plate after the track plate breaks,which means there might be some fracture risks of base plate,the fracture of base plate has a great influence on adjacent bridge span and adjacent track slab,which results in increase of track plate and rail force and CA mortar debonding in a wide range,the track plate and base plate breaking at the same time will have the most effect on girder-rail system,rail strength is close to the allowable limit value when the track plate and base plate on continuous girder breaks at the same time,which can be used to determine the maximumallowable temperature span oflongitudinal connected slab,the fracture oflongitudinal connected slab and rail will happen in the other railway line when the track plate,base plate and rail breaks in one railway line,which will cause the bridge pier tilt due to exceeding force.