中文摘要：

为分析某刚构桥两端CRTSⅠ型框架型板式无砟轨道无缝线路扣件复合垫板窜出、半圆形凸形挡台与底座连接处拉裂以及半圆形凸形挡台周围填充树脂与轨道板产生较大离缝等病害，基于桥上无砟轨道无缝线路受力特点，采用有限元的方法建立线-板-桥-墩一体化计算模型，分析树脂强度、桥上铺设小阻力扣件以及设置钢轨伸缩调节器对轨道结构受力和变形的影响。结果表明：刚构桥两端扣件复合垫板窜出主要是由于采用小阻力扣件时，桥梁两端位置处的钢轨与轨道板的相对位移过大所致；半圆形凸形挡台与底座连接处拉裂、树脂大离缝等病害主要是因为在扣件纵向阻力过大以及树脂层的强度未达到设计强度，钢轨与桥梁温度变化使凸形挡台周围树脂层受力过大所致；桥上采用小阻力扣件时应该研究其铺设范围以期达到既能降低钢轨伸缩附加力又不显著增加钢轨与轨道板的相对位移。

英文摘要：

In order to find out the reason for composite backing plates of fastener springing, tension crack of the joint between semicircular convex and base and big open joint between the resin layer around the semicircular convex and the slab in rigid frame bridge both ends, a rail-slab-beam-pier integrated model was established which is based on the stress characteristics of the continuous welded rail of ballstless track on rigid frame bridge and the finite element method to analyse the effect of the strength of resin and laying small resistance fastener or rail expansion joints on bridge on the track structure stress and deformation. The results show that the main reason for backing plates springing is the use of small resistance fastener which made the relative displacement between rail and slab too large. When the temperature of rail and bridge changes, large fastener longitudinal resistance and insufficient strength of the resin layer make the resin layer bear excessive force which make the tension crack and big open joint. It is necessary to study the covering range of small resistance fastener on bridge to reduce the additional rail expansion force without significant increase in relative displacement between rail and slab.