不同型式磁浮轨道梁动力响应分析

Dynamic response of different guideway structures of maglev

为研究磁浮轨道梁力学性能问题,以高速磁浮较为常见的24 m跨度复合梁和整体梁为研究对象,对2种梁型的自振特性和列车作用下动力响应特征进行了分析。研究表明：整体式轨道梁各阶自振频率高于复合梁,梁重却比复合梁降低了17%;整体梁在列车作用下动力响应小于复合梁,整体梁冲击系数为1.01~1.081,复合梁冲击系数为1.022~1.121,在计算速度范围内无明显共振出现,从力学性能角度来说,整体梁性能较优;2种轨道梁动态变形对列车舒适性的贡献度很小,影响磁浮列车舒适性的主要因素为不平顺激扰。

In order to study dynamic response of maglev guideway,natural vibration and the dynamic response induced by train load were calculated and analyzed for the 24 m span concrete compound structure and the overall structure.The results show that the natural vibration frequency of overall structure is higher than that of compound structure,and the weight of overall structure is 17% less than that of compound structure.The response induced by train load for overall structure is less than that of compound structure,with the impact coefficient 1.01–1.081 and 1.022–1.121,respectively,for overall structure and compound structure.The vertical resonance of guideways would not happen when the speed is lower than 500 km/h.Analysis indicates that overall structure has better mechanical property.Dynamic deformation of the two guideway structures has little impact on vehicle comfort,while track irregularity is the major factor affecting vehicle comfort.