摘要
研究目的:为研究温度梯度作用对高速铁路行车安全性的影响,以徐兰高速铁路郑徐段为背景,采用ABAQUS建立四跨32.6 m高速铁路简支梁桥及CRTSⅢ型无砟轨道有限元模型,分析不同温度梯度作用下钢轨附加变形的变化规律。在此基础上,将含钢轨附加变形的桥梁-轨道结构有限元模型导入多体动力学软件SIMPACK中进行车桥耦合动力仿真分析,探讨各工况下车辆响应的变化规律和行车安全性。研究结论:(1)温度引起的钢轨横向和竖向附加变形均随着温度梯度幅值的增大而增大;(2)竖向温度梯度作用主要引起钢轨竖向几何形状变化,对横向的几何形位影响较小;横向温度梯度作用主要引起钢轨轨距的变化;(3)所考虑工况中,温度梯度幅值越大,车体竖向加速度峰值越大,变化的幅度也越大,但都满足规范要求;(4)轮轨垂向力以及轮重减载率与温度梯度幅值的相关性不明显;(5)本研究成果可为高速铁路设计、桥上列车行车安全性评估提供参考。
Research purposes:To study the influences of temperature gradients actions on the running safety of high-speed railway,ABAQUS is used to establish the finite element model of the four-span 32.6 m high-speed railway simply-supported beam bridge and CRTSⅢballastless track based on Zhengzhou-Xuzhou section of Xuzhou-Lanzhou high-speed railway,and the change law of additional deformation of rail under different temperature gradients actions is analyzed.On this basis,the finite element model of bridge-track structure with additional deformation of rail is imported into the multi-body dynamics software SIMPACK for the simulation analysis of vehicle-bridge coupling dynamics,and the change law of vehicle response and running safety under various working conditions are discussed.Research conclusions:(1)As the amplitude of temperature gradient action increases,rails’lateral deformation and vertical deformation increase as well.(2)Vertical temperature gradients mainly deform rail in vertical plane and have little effects in lateral plane while lateral temperature gradients mainly influence track gauge in lateral plane.(3)In the conditions considered,the larger the temperature gradient,the larger the vertical acceleration peak and the larger the range of change,but all of them meet the requirements of the specification.(4)Wheel-rail vertical force and wheel load reduction rate don’t seem to have obvious correlation with amplitude of temperature gradient.(5)The research achievements can provide reference for the design of high-speed railway and the running safety estimation of train on bridges.
作者
勾红叶
杨睿
GOU Hongye;YANG Rui(Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《铁道工程学报》
EI
北大核心
2020年第3期47-52,共6页
Journal of Railway Engineering Society
基金
国家自然科学基金项目(51878563)
四川省科技计划资助项目(2018JY0294,2018JY0549)。
关键词
高速铁路
温度梯度
CRTSⅢ型
钢轨附加变形
车桥耦合
桥上行车安全
high-speed railway
temperature gradients
CRTSⅢ
additional deformation of rail
vehicle-bridge coupled system
running safety
