高速铁路桥墩沉降与钢轨变形的映射关系(Ⅰ):单元板式无砟轨道系统

在分析钢轨随桥墩沉降变形机制的基础上,从理论上推导了桥上铺设单元板式无砟轨道条件下桥墩沉降和钢轨变形间的映射关系,给出了钢轨随桥墩沉降发生变形的解析表达式,与相应有限元模型的计算结果进行了对比,并分析了不同沉降量条件下的钢轨变形区域长度.研究结果显示解析模型和有限元模型得出的钢轨变形曲线十分吻合,表明两种模型均可用于求解单元板式轨道条件下桥墩沉降和钢轨变形的映射关系;常用跨度桥梁结构的桥墩沉降会对高速行驶的列车产生低频激励,该激振频率与车体的垂向自振频率相近,将对车体振动产生较大影响.

Mapping relationship between pier settlement and rail deformation of high-speed railways--part （I）： The unit slab track system

This paper presents a method to obtain the mapping relationship between the pier settlement and the rail deformation of high-speed railways in the case of unit slab track system. Based on the mechanism analysis of rail deformation along with pier settlement, the analytic expression of the mapping relationship between pier settlement and rail deformation in unit slab track system is deduced. The results of the analytic expression and the corresponding FEM model are compared. Finally, the length of rail deformation area with different settlement is analyzed. The results show that the analytical rail deformation curve agreed quite well with the simulation result, indicating that both the analytic expression and the FEM model are available to figure out the mapping relationship between pier settlement and rail deformation in unit slab track system. The excitation frequency caused by high-speed trains running through the pier settlement area is close to the natural frequency of car body, which would have a big influence on the car body vibration.