应用车辆-道岔-桥梁耦合动力学分析道岔-桥梁合理相对位置

为确定道岔、桥梁的合理相对位置,深入研究快速及高速行车条件下车辆-道岔-桥梁的动态相互作用,将车辆、道岔区轨道和桥梁作为一个整体,建立车辆-道岔-桥梁耦合系统动力分析模型,用数值模拟的方法计算分析高速行车条件下道岔区轨道、车辆与连续桥梁结构的动力特性及行车安全性和舒适性。以车速350 km/h通过18号国产道岔,岔桥相对位置为尖轨尖端分别位于桥跨1/4、跨中、3/4跨及墩上,通过计算出的尖轨和心轨开口量、尖轨和心轨动应力、车体振动加速度、减载率、脱轨系数、舒适性、桥梁振幅、振动加速度和梁端转角等动力响应,确定在车辆-道岔-桥梁耦合动力条件下4×32 m连续梁桥的合理岔桥相对位置。计算结果表明,18号国产道岔铺设于4×32 m连续梁桥上时,道岔尖轨尖端位于1/4跨时综合动力效果较佳。

Vehicle-turnout-bridge Coupling Dynamics Analysis for Turnout-bridge Relative Position

Dynamical vehicle-turnout-bridge interaction was studied to determine the rational relative position of the turnout and bridge.The dynamic model of the vehicle-turnout-bridge coupling system was established,and the numerical simulation method was applied to analyze the dynamic characteristics of the vehicle-turnout-continuous bridge structure and the safety and comfort of trains running at high speeds.Assume that the train runs at the speed of 350 km/h through China-made Turnout No.18 and the toe of switch rail was placed at the 1/4 span,mid-span,3/4 span and the top of the pier respectively.The turnout-bridge relative position for the 4×32 m continuous bridge under the action of dynamic coupling of the vehicle-turnout-bridge structure was determined by calculating the train running safety,ride comfort,vibration acceleration of vehicle body,dynamic stresses and displacements of switch rail and nose rail,load reducing rate,derailment coefficient,vibration amplitude and acceleration of bridge,and so on.The calculation results show that the toe of switch rail should be placed at the 1/4 span of the bridge so as to achieve good dynamic effect.