两跨连续磁浮轨道梁动力性能分析

Dynamic characteristics analysis on two-span continuous guideway of high-speed maglev line

两跨连续梁是磁浮交通工程中常见的结构形式,本文建立了两跨连续梁墩体系有限元模型,分析了约束条件对自振特性影响,进行了列车作用下连续梁动力响应分析,研究表明:轨道梁由简支变连续后各阶自振频率都有所降低;两跨连续梁支座约束布置不对称可导致振动形态复杂;随着列车速度提高轨道梁和车辆响应总体呈提高趋势,两跨连续梁无明显共振现象,车辆振动响应在速度超过250km/h后明显提高。

A two-span continuous guideway-pier FEM model is established in this paper according to the common guideway in high-speed maglev line. Effect of the restraint conditions on the natural frequencies of guideway is analyzed and dynamic response of continuous guideway under train load is simulated. The results show that the natural frequencies will reduce if the guideway change from single style into two-span continuous style; the modes will be more complex if the restraints are antisymmetric; the dynamic response will get more obvious while the speed of the train get higher but no resonance will occur; the dynamic response is sharply increase when the train speed exceed 250km / h.