高速铁路桥上不同轨枕型式动力特性对比

在对国内外多种轨枕型式调研分析的基础上,结合我国高速铁路桥上有砟轨道结构特点,确定了高速铁路轨枕型式的初选方案.建立车辆-轨道-桥梁耦合系统动力分析模型,对Ⅲ型轨枕、宽轨枕、梯子式轨枕和框架式轨枕4种轨枕型式的动力性能进行了对比分析,选出了适合桥上应用的轨枕结构方案.并对选定的轨枕结构型式进行优化,提出了适合我国高速铁路的桥上有砟轨道轨枕结构的选型建议.研究结果表明:在所选轨枕型式中,宽轨枕动力性能相对较优;综合考虑养护维修对有砟轨道的要求,建议高速铁路桥上有砟轨道采用Ⅲ型轨枕加宽的方案;根据动力分析的结果,在Ⅲ型轨枕基础上加宽2～4cm即可以起到有效减小道床压应力和降低养护维修工作量等效果.研究结果可为高速铁路桥上轨枕结构的设计提供一定的参考.

Comparative Study on Dynamic Characteristics of Different Sleeper Types on Bridge in High Speed Railway

Based on the investigation and analysis of different sleeper types at home and abroad,primary schemes of sleeper type on bridge in high speed railway were determined according to the structure characteristics of ballast track on bridge in high speed railway of China.The sleeper types proposed in the primary schemes including type Ⅲ sleeper,wide sleeper,ladder sleeper and frame sleeper.Then a vehicle-track-bridge coupling system dynamic analysis model was established,with which the dynamic performances of the primary selected sleeper types were compared and analyzed to select the suitable sleeper type for bridge.The selected sleeper type was optimized,and the wide sleeper is recommended for high speed railway in China.Based on a comprehensive consideration of the track maintenance,type Ⅲ sleeper was proposed for sleeper scheme.The dynamic analysis results show that the widening sleeper with 2~4 cm type Ⅲ sleeper can well reduce ballast stress and be easy to maintain.Study results are helpful for the design of new sleeper structures on bridge.