摘要
路桥过渡段路基上拱会引起相邻桥上扣件上拔,导致道床板空吊,产生静、动态不平顺。车辆高速通过时,静、动态不平顺的存在会对行车安全性及舒适性产生影响。本文通过建立路桥过渡段车辆、轨道、桥梁、路基耦合静动态分析模型对上拱静态不平顺及其引起的动力响应进行评估。评估结果表明:路基侧上拱量大于2 mm后桥梁侧道床板下开始产生离缝,离缝随着路基侧上拱量增加呈线性增长趋势,桥梁侧扣件受拉明显;路基侧上拱量5 mm时速度350 km/h情况下车体垂向加速度达到规范限值,轮重减载率达到0. 53;上拱量10 mm时速度大于150 km/h以后车体垂向加速度超标,速度超过250 km/h以后轮重减载率超标;离缝量达到10 mm时,桥梁侧扣件在行车过程中动态受拉明显,最大动态拉力达到42. 2 kN。
The subgrade arching of the roadbed-bridge transition zone will cause the uplifting of the fasteners on the adjacent bridge,leading to track slab hanging and static and dynamic irregularity.The existence of static and dynamic irregularities will affect the running safety and comfort of the vehicle travelling at high speed.In this paper,a static and a dynamic analysis model coupling vehicle,track,bridge and roadbed was built,to estimate the static irregularity caused by the subgrade arching and its dynamic influence.The results show that when the subgrade arching is larger than 2 mm,the gap under the track slab begins to develop,which increases linearly with the increase of the subgrade arching.The fasteners on the adjacent bridge are uplifted obviously.At 5 mm of the subgrade arching,the vertical acceleration of the car body reaches the standard limit when the vehicle speed reaches 350 km/h.At this point,the wheel load reduction rate reaches 0.53.At 10 mm of the subgrade arching,the vertical acceleration of the car body reaches the standard limit when the vehicle speed reaches 150 km/h.The wheel load reduction rate reaches the standard limit when the vehicle speed reaches 250 km/h.When the subgrade arching is 10 mm,the fasteners on the adjacent bridge bear significant dynamic uplifting force,with the maximum dynamic uplifting force of 42.2 kN.
作者
赵磊
ZHAO Lei(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2018年第10期127-134,共8页
Journal of the China Railway Society
基金
中国铁路总公司科技研究开发计划(2017G010-B
Z2017-G003)
中国铁道科学研究院科研项目(2016YJ023)
关键词
高速铁路
无砟轨道
路桥过渡段
路基上拱
层间离缝
high-speed railway
ballastless track
roadbed-bridge transition
subgrade arching
interlayer separation
