轨道梁参数对磁浮车—高架桥垂向耦合动力响应的影响研究

Study of the Effect of Track Beam Parameters on Vertical Coupled Dynamic Response of Maglev Vehicle-Viaduct

建立磁浮车—高架桥垂向耦合模型,运用车—桥垂向耦合程序,分别探讨桥梁刚度和高架桥线路的不平顺对磁浮车—高架桥垂向动力响应的影响,分析结果表明:在相同的轨道梁抗弯刚度下,随着磁浮列车运行速度的增加,桥梁的振动响应增大,但轨道梁刚度大的桥梁振动响应比刚度小的桥梁振动响应增加幅度小一些;在相同车速下,随着轨道梁抗弯刚度的降低,桥梁振动响应增大;车辆重向振动响应在轨道抗弯刚度达3 8612×1010N·m2之前,随轨道梁抗弯刚度的增大而减小,在轨道梁抗弯刚度达3 8612×1010N·m2之后,无明显影响;线路状态对车辆的动力响应有明显影响,较差的线路状态将使高架桥挠度增大,使车体垂向振动加速度明显增大。

A vertical coupling model for maglev vehicle-viaduct is built. The vehicle-bridge vertical coupling program is used to respectively study the effect of bridge rigidity and the irregularity of a viaduct line on the vertical dynamic response of maglev vehicle-viaduct. Analytical results show that with the same bending rigidity of track beam, the vibration response of maglev vehicle-viaduct increases with the running speed of the maglev vehicle, but the vibration response of a bridge with greater track beam rigidity increases less in amplitude than that of a bridge with less great rigidity. With an identical vehicle running speed, the vibration response of the bridge increases with the decrease of track beam bending rigidity. Before the bending rigidity of the track beam reaches a value of 3.8612×1010 N&middotm2, the response of the vertical vibration of the vehicle decreases with the increase of the bending rigidity of the track beam. After the bending rigidity has reached this value, the effect is not significant. In sum, the condition of the railway line has a distinct impact on the dynamic response of the vehicle. Poor line condition gives rise to an increase of the deflection of the viaduct and a significant increase of the vertical vibration acceleration of the vehicle body.