地铁线路坡度对道岔纵向力学特性的影响

Influence of Metro Line Slope Gradient on Turnout Longitudinal Mechanical Characteristics

建立了地铁线路9号道岔纵向力学特性有限元分析模型。基于模型分析获得了列车荷载的最不利加载位置。研究了在列车制动荷载、温度荷载及两种荷载组合作用下,线路坡度对道岔纵向力学特性的影响。研究结果表明:当列车第3节和第4节车辆相邻的两个转向架处于尖轨上时,对道岔受力与位移最为不利;道岔结构纵向位移与纵向力随着坡度、温度变化的增大均呈线性增大;在最不利工况时,30‰坡度上的道岔的钢轨强度及纵向位移均满足规范要求。

For metro line No.9 turnout,a finite element analysis model of turnout longitudinal mechanical characteristics is established.Based on model analysis,the most unfavorable train loading position is obtained.The influence of line slope gradient on turnout longitudinal mechanical characteristics under train braking load,temperature load and their combination is studied.Research results show that when the two adjacent bogies of the 3rd and the 4th train compartments are on the switch rail,the turnout stress and displacement are most unfavorable.The longitudinal displacement and longitudinal force of turnout structure will increase linearly with the increase of slope gradient and temperature change.Under the most unfavorable working condition,the rail strength and longitudinal displacement of the turnout on slope gradient of 30‰can meet the specification requirements.