中文摘要：

本文对天兴洲公铁两用斜拉桥主梁纵向列车制动的振动反应进行了研究。天兴洲大桥是目前在建的世界上跨度最大的公铁两用斜拉桥，由于具有四线铁路，其主梁在列车制动及行车移动荷载作用下会沿纵向产生大幅振动，因此对其列车制动及行车移动荷载反应进行研究尤为必要。文中，首先根据车辆动力学的原理建立了列车制动动力学模型，获得了列车制动力纵向荷载及在制动过程中列车行走所产生的竖向荷载，并建立制动力传递有限元模型，应用有限元分析软件来获取钢轨上制动力及列车行走时引起的桥梁结构节点上的作用力时程。最后对天兴洲公铁两用斜托桥主梁纵向列车制动及行车移动荷载的振动反应进行了仿真分析，发现了其主梁纵向列车制动反应具有位移大且速度极小的特点。

英文摘要：

The longitudinal vibration responses in the deck of the Tianxingzhou cable-stayed bridge, which is the longest span highway and railway combined cable-stayed bridge in the world, subjected to train braking and train traffic is investigated. The deck of the Tianxingzhou Bridge should produce large longitudinal responses induced by train braking and traffic due to four rail lines on it, therefore, it is necessary to investigate its responses subjected to train braking and traffic. In the paper, the train braking dynamic model is established through the theory of vehicle dynamic mechanics, and then the longitudinal forces induced by train braking and the vertical forces caused by train traffic are obtained. Then force time history acting on the bridge structure nodes induced by train braking and train traffic can be obtained on the basis of train braking transferring model through finite element analysis software. Furthermore, the longitudinal vibration responses in the deck of the Tianxinzhou Bridge induced by train braking and train traffic are obtained, and the characteristics of it are summarized.