直逆向过岔时列车-道岔-连续刚构桥系统空间振动分析

针对桥上无缝道岔,运用有限单元法,建立钢轨-岔枕-桥梁系统空间振动分析模型。运用弹性系统动力学总势能不变值原理及形成矩阵的“对号入座”法则,建立了列车-道岔-桥梁系统空间振动方程组。以温福客运专线田螺大桥为例,拟定桥上铺设了由2组38号道岔组成的单渡线,计算“中华之星”电动车组,按一动四拖的编组方式,以200 km/h的速度直逆向通过时,列车-道岔-桥梁系统空间振动响应,并与列车通过路基无缝道岔和桥上无缝线路的动力响应进行对比。计算结果表明,桥梁导致钢轨和岔枕的位移增幅较大,列车动力响应有所增加,对道岔振动加速度和轮轨力影响不显著;道岔导致桥梁振动加速度小幅增加,而列车动力响应显著增大。

Analysis of train-turnout-continuous frame bridge system spatial vibration with train through turnout main

Aiming at seamless turnout with ballast on bridge,the rail-turnout tie-bridge system vibration analysis model was built by using finite element method.The train-turnout-bridge system spatial vibration equation sets were formulated by using the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating matrixes.Taking Tianluo major bridge in Wenzhou-Fuzhou railway line for passenger as an example,it was assured that there was a crossover combined with two No.38 turnouts on the bridge.The train-turnout-bridge spatial system vibration responses were analyzed when "China Star" high speed train with 1 locomotive and 4 passenger cars at the speed of 200 km/h through turnout main.The results were compared with those of train through turnout on roadbed and of train through continuously welded rail track on bridge.The calculation results show that bridge leads the displacement of rail and turnout tie increases very much,the dynamic responses of train increases a little,and it has little effect to the acceleration of the system and wheel/rail force.Turnout leads the acceleration of beam increase a little and the dynamic responses of train increase very much.