高速铁路桥墩沉降与钢轨变形的映射关系(Ⅱ):纵连板式无砟轨道系统

分析了桥上铺设纵连板式轨道条件下钢轨随桥墩沉降产生变形的机理,并与单元板式轨道条件下的钢轨变形机理进行了对比,在此基础上,推导了纵连板式无砟轨道条件下桥墩沉降和钢轨变形间映射关系的解析表达式,计算了钢轨随桥墩沉降的变形曲线,与此同时采用有限元方法从桥梁结构受力与变形的角度分析了桥墩沉降引起的钢轨变形曲线,并与解析计算结果进行了对比,最后对纵连板式轨道和单元板式轨道条件下钢轨随桥墩沉降的变形曲线进行了对比分析.研究结果表明解析模型和有限元模型均可用于求解纵连板式轨道条件下桥墩沉降和钢轨变形的映射关系;相比于单元板式轨道,纵连板式轨道条件下的钢轨变形更缓和,列车高速通过其沉降区域时产生的激振频率也更低.

Mapping relationship between pier settlement and rail deformation of high-speed railwaysmpart （Ⅱ）： The longitudinal connected ballastless track system

The mechanism analysis of rail deformation along with pier settlement in the longitudinal connected ballastless track system is analyzed and compared with that in unit slab track system. On this basis, the analytic expression of the mapping relationship between pier settlement and rail deformation in longitudinal connected ballastless track system is deduced, and the rail deformation curve is calculated. From the point of the bridge deformation, the finite element method is used to analyze the rail deformation along with pier settlement. The results of the rail deformation curves both in analytic expression and FEM model are compared. Finally, the rail deformations along with the pier settlement in different track systems are analyzed. The results show that the analytic expression and the FEM model are both available to solve the mapping relationship between pier settlement and rail deformation in longitudinal connected track system. The rail deformation and the excitation frequency caused by high-speed trains in longitudinal connected ballastless track system are both smaller than those in the unit slab track system.