In this paper, the dynamic response analysis of long-span continuous bridge under earthquake and train load was simultaneously performed. In order to clearly reveal the mechanism of vibration coupling between vehicles and highway long-span continuous bridge, a numerical model including soil foundation, vehicle and bridge under inclined seismic wave was established utilizing finite element software. The dynamic response of the bridge with different wave incident angles and different train speeds was numerically analyzed. The results show that the wave incident angles have a significant effect on the dynamic response of the bridge, and with the increasing of the wave incident angle, the vertical displacement and velocity as well as the acceleration of mid-span constantly increase. While the dynamic response of the bridge does not increase always with the increasing of train speed, however, at a certain train speed, the dynamic response will reach the maximum. With the increasing of the train speed, the vertical displacements of mid-span points increase while the moments at mid-span reduce significantly when the soil–structure dynamic interaction was considered. The results can provide significant references to ensure the train safe running on the bridges under the earthquake.

中文翻译：

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考虑列车速度和地震影响的大跨度连续桥动力响应分析

本文同时进行了大跨度连续桥梁在地震和列车荷载作用下的动力响应分析。为清晰揭示车辆与公路大跨连续桥的振动耦合机理，利用有限元软件建立了倾斜地震波作用下的土基、车辆和桥梁的数值模型。数值分析了不同波入射角和不同列车速度下桥梁的动力响应。结果表明，波浪入射角对桥梁动力响应有显着影响，随着波浪入射角的增大，竖向位移和速度以及跨中加速度不断增大。虽然桥梁的动力响应并不总是随着列车速度的增加而增加，但在一定的列车速度下，动力响应会达到最大值。随着列车速度的增加，考虑土-结构动力相互作用时，跨中点垂向位移增大，而跨中弯矩显着减小。研究结果可为地震下列车在桥梁上安全运行提供重要参考。