摘要
针对城市轨道交通小半径曲线地段列车荷载引起的挠曲问题,基于梁轨相互作用原理建立曲线地段梁-轨计算模型,并考虑参数一致条件下的直线线型,分析单线列车荷载、双线列车对称荷载及双线列车非对称荷载作用对无缝线路挠曲受力与变形的影响。结果表明:直线线型与曲线线型挠曲受力及变形的分布规律基本一致,曲线地段钢轨横向位移与墩台垂直线路方向的受力远大于直线地段;在单线列车荷载作用下,曲线外侧线路的受力与变形往往大于曲线内侧,直线线型与曲线线型的计算结果相差较大,而双线列车对称荷载作用下相差较小,其原因为单线列车偏载引起桥梁扭转变形较大;双线列车偏载作用对曲线内外两侧线路力学性能影响较大,尤其当荷载作用于桥台时,桥台位置的受力变化较大。
Aiming at the deflection problem caused by train load in small radius curve section of urban rail transit,a beam-rail calculation model is established for curved sections based on the principle of beam-rail interaction.Considering the straight line under the condition of consistent parameters,the effects of single-line train load,double-line train symmetrical load and double-line train asymmetric load on the deflection force and deformation of CWR are analyzed.The results show that the distribution laws of deflection force and deformation of straight line and curve line are basically the same,the lateral displacement of rail in curved section and the force of pier perpendicular to the line are much larger than those in straight section.Under the action of single-line train load,the force and deformation of the line outside the curve are often greater than those inside the curve.The calculation results of straight line and curve line are quite different,while the difference under the symmetrical load of double-line train is small on account of the fact that the torsional deformation of the bridge caused by the eccentric load of the single-line train is large.The bias load of the double-track train has greater influence on the mechanical properties of the lines on both sides of the curve,especially when the load acts on the abutment,the force at the abutment position changes greatly.
作者
刘文武
罗信伟
冯青松
孙魁
许晨霄
LIU Wenwu;LUO Xinwei;FENG Qingsong;SUN Kui;XU Chenxiao(Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;Engineering Research Center of Railway Environment Vibration and Noise,Ministry of Education,East China Jiaotong University,Nanchang 330013,China)
出处
《铁道标准设计》
北大核心
2022年第12期38-43,共6页
Railway Standard Design
基金
江西省主要学科学术和技术带头人培养计划项目(20194BCJ22008)
江西省重点研发计划项目(20192BBE50008)。
