中文摘要：

为了比较浮置板轨道预制短板型式与现浇长板型式动力特性及服役性能的差异，将轨道结构作为一种周期性的无限结构，根据两种轨道自身的结构特点，建立相应动力计算模型进行了计算及分析。计算结果表明：（1）预制短型浮置板轨道结构对低频荷载的分摊承载能力弱于现浇长型浮置板轨道结构；（2）浮置板交错反相振动的轨道模态对预制短型浮置板轨道结构的振动影响较大，但对现浇长型浮置板轨道结构的振动几乎没有影响；（3）运行列车作用下，现浇30m长板浮置板轨道的钢轨及浮置板响应在30～100Hz频段内大于预制3．6m短板浮置板轨道，但预制3．6m短板浮置板轨道的钢轨及浮置板响应在25Hz以下的大部分频段却大于现浇30m长板浮置板轨道；（4）相较于现浇长型浮置板轨道，预制短浮置板轨道应采用疲劳寿命更长的隔振器。

英文摘要：

In order to compare the dynamic characteristics and service performances of prefabricated short and cast-inplace long floating slab tracks, under the condition of regarding the track structures as periodic infinite structures, the dynamic analysis models for two types of tracks are established according to their structure characteristics, and then some related calculations are implemented. Calculation results show that： （1） Compared with the cast-in-place long floating slab track （FST） structure, the prefabricated short FST structure＇s sharing capacity for bearing the low frequency loads is lower. （2） Track mode corresponding to any two neighbouring slabs vibrating with opposite phases has great influence on the vibration response of prefabricated short FST structure, but has nearly no influence on that of cast-in-place long FST structure. （3） In the frequency band of 30 - 100Hz, the rail and slab responses of cast-in-place long FST caused by moving train are greater than those of prefabricated short FST, but in most frequency bands below 25I-Iz, the rail and slab responses of prefabricated short FST caused by moving train are greater than those of cast-in-place long FST. （4） Compared with the cast-in-place long FST, the prefabricated short FST should adopt the vibration isolators with a longer fatigue life.