【摘要】 既有线提速是高速铁路发展的重要方向之一。本文主要对轨道路基在列车荷载作用下的动力响应规律进行了研究。首先,建立轨道系统在移动荷载作用下的动力响应理论分析模型,该模型将轨道结构视为连续支承欧拉梁,对ANSYS软件进行二次开发,实现了模型的数值分析;然后,建立直线段轨道数值分析模型,利用该模型分析了荷载速度、载重、不平顺波长、不平顺波深对既有线路提速200 km/h客货共线直线段钢轨、轨枕的竖向位移及竖向加速度的影响。可为制定新的铁路养护技术规范提供技术参考。更多还原

【Abstract】 The modification of old lines is one of important trends of the development of express railways. The dynamic performance of roadbed of railways under the loads of trains is studied in this paper.First,a theoretical model of dynamic response of the track system under moving loads is formulated with the structure of the track system considered as a continuously supported Euler’s beam to implement its numerical analysis through the secondary development of the ANSYS software;then,a numerical model of the rectilinear segment of the track system is established to analyze the influence,of the speeds and intensity of the moving loads,the length and depth of the dis-glide wave,on the vertical displacement and acceleration of the steel rails and rail sleepers when the old line is speeded up to 200 km/h.The results in this paper will provide a technical reference for the formulation of new code of railway protection.更多还原