中文摘要：

为了分析结合位置对列车与混合梁斜拉桥耦合振动的影响，以甬江特大跨混合梁斜拉桥为例，根据弹性系统动力学总势能不变原理及行成矩阵的“对号入座”法则，建立车桥振动方程及分析模型。研究结果表明：随着钢一混结合位置深入主梁，列车的振动响应未出现较大变化，桥梁的上结合点的振动加速度增加较为明显，增加连接键的疲劳负担，应予以重视；同时，结合点的刚度平稳过渡，满足行车要求。

英文摘要：

In order to analyze the influence of steel - concrete joint section on coupling vibration of vehicle and cable - stayed bridge with hybrid girder, Yong Jiang bridge was taken as an example, which is a long span cable - stayed bridge with hybrid girder. Meanwhile, according to the principle of total potential energy with stationary value in elastic system dynamics and the ＂setting in right position＂ rule for formulating system matrixes, the cou- pling vibration equation and analysis model were established. The results show that the vehicle＇s vibration re- sponse does not change heavily with the steel - concrete joint section inserting into main span, while the vibration acceleration of steel - concrete joint section increases dramatically, and the fatigue burden of the connectors in- creases, which more attention should be paid to. Simultaneously, the stiffness of binding site has a smooth tran- sition, which meets the requirements of vechides going.