为研究纵连板式无砟轨道－ 桥梁整体的动力性能，对桥上CＲTSⅡ型无砟轨道建立了多测点测量系统，详细观测了CＲTSⅡ型轨道工作时各结构的响应特征，对各结构的横向加速度、竖向加速度、竖向位移以及梁体的自振频率、阻尼比、动力系数进行了统计分析． 结果表明: CＲTSⅡ型无砟轨道系统的竖向总减振率可达90%以上，行车振动传至桥面板时，最大竖向加速度幅值为3． 93m/s2，最大竖向位移幅值为0． 131 4 mm，满足相关规范要求; 行车振动对邻线影响较小，且影响主要集中在简支梁固定支座端; 车致振动响应基本与行车速度呈正相关; 在特定速度附近，部分结构可能产生与轨道系统整体不同步的振动模式，存在离缝与损坏的隐患; 在CＲTSⅡ型无砟轨道系统下，简支梁一阶竖向自振频率约为7． 27Hz，略大于裸梁理论值．

In order to explore the dynamic performances of continuous CRTSⅡ ballastless track slab-bridge system,a multi-point measuring system was established.With the help of this system,the dynamic response of each component of the system was observed in detail,and the lateral acceleration,vertical acceleration and vertical displacement of the CRTSⅡ track slab system,as well as the natural vibration frequency,damping ratio and impact coefficient of the beam,were analyzed statistically.The results show that ( 1) CRTSⅡ track slab system has a good capability of buffering train-induced vibrations,with a total vibration reduction rate of more than 90%,a maximum vertical acceleration of bridge deck of 3. 93m/s2 and a maximum vertical displacement of 0. 131 4 mm after the vibration has been transferred to the bridge deck,which meets the requirements of the related standards; ( 2) the train load-induced vibration has a slight effect on the adjacent railway,which focuses on the fixed support side; ( 3) the train load-induced vibration is primarily positively related to the train speed,and parts of the structure may vibrate differently from the track slab-bridge system at a special train speed,which may lead to cracks or damage; and ( 4) the measured one-order natural vibration frequency of simply-supported beam in the CRTSⅡ track slab-bridge system is about 7. 27Hz,which is slightly greater than the theoretical one of the simply-supported beam without track slab.