铁道科学与工程学报2017，Vol.14Issue(11)：2309-2322,14.
制动荷载作用下桥上无砟轨道动力响应分析
Dynamic response analysis of ballastless track on bridge under braking load
摘要
Abstract
In order to study the problem of dynamic response of ballastless track on bridge under braking load, vehicle subsystem model and ballastless track-bridge subsystem model were established. The train braking force was determined according to the braking deceleration characteristic curve of high-speed train and wheel-rail force was calculated by Hertz theory, the finite element equation was solved by cross iteration method. Taking a CRH2 of four marshalling braking on ballastless track on bridge for example, the dynamic response was analyzed. Calculation results show that, longitudinal, vertical displacement and acceleration of track and bridge structure are gradually decreasing, and the vertical vibration of the rail structure at the beam-end is larger than that of the middle span. The vertical dynamic response of the track structure caused by the gradual decrease of the train speed is also reduced in the train braking process; Longitudinal displacements of track structure and bridge are reverse mutant, longitudinal accelerations are mutation when train stops, then they have a free attenuation trend; train and bridge appears maximum longitudinal vibration at the moment of train stopping. The research results can provide theoretical support for the design of ballastless track on bridge.关键词
制动荷载/高速列车/车辆单元模型/无砟轨道-桥梁单元模型/动力响应Key words
braking load/high-speed train/vehicle element model/ballastless track-bridge element model/vibration response分类
交通工程引用本文复制引用
潘鹏,雷晓燕,张鹏飞,吴神花,桂昊..制动荷载作用下桥上无砟轨道动力响应分析[J].铁道科学与工程学报,2017,14(11):2309-2322,14.基金项目
国家自然科学基金资助项目(51478184,51768023) （51478184,51768023）
