中文摘要：

当它受到近差错的择向性时， vehicle-track-bridge (VTB ) 元素被用来调查一座高速度的铁路桥怎么反应了像脉搏的地面运动。基于 PEER 唠叨充分的理由运动数据库，一个车辆桥系统的空间分析模型被开发， VTB 元素被导出模仿火车和桥牌的相互作用，并且桥的 elasto 塑料的地震回答是计算的。计算结果证明墩的那 girder 和墩顶排水量，和弯曲时刻基于受到近差错的择向性的增加与远地的地震相比的像脉搏的地面运动，和在近差错的摇晃的更大的变丑回答与少数被联系装载的颠倒的周期。受到近差错的择向性的墩的 hysteretic 特征像脉搏的地震应该明确地被表示为墩底的弯曲时刻旋转关系，它被集中地加强的 hysteretic 周期在装载时间历史曲线的某点描绘。结果证明有在由于高垂直的地面运动中间跨度的 girders 的垂直偏转的扩大。考虑到这些调查结果，垂直地面运动的效果应该被用来在桥牌的地震设计调整 vertical-to-horizontal 山峰地面运动比率的 unconservative 扩大常数 2/3。

英文摘要：

The vehicle-track-bridge （VTB） element was used to investigate how a high-speed railway bridge reacted when it was subjected to near-fault directivity pulse-like ground motions. Based on the PEER NAG Strong Ground Motion Database, the spatial analysis model of a vehicle-bridge system was developed, the VTB element was derived to simulate the interaction of train and bridge, and the elasto-plastic seismic responses of the bridge were calculated. The calculation results show that girder and pier top displacement, and bending moment of the pier base increase subjected to near-fault directivity pulse-like ground motion compared to far-field earthquakes, and the greater deformation responses in near-fault shaking are associated with fewer reversed cycles of loading. The hysteretic characteristics of the pier subjected to a near-fault directivity pulse-like earthquake should be explicitly expressed as the bending moment-rotation relationship of the pier base, which is characterized by the centrally strengthened hysteretic cycles at some point of the loading time-history curve. The results show that there is an amplification of the vertical deflection in the girder＇s mid-span owing to the high vertical ground motion. In light of these findings, the effect of the vertical ground motion should be used to adjust the unconservative amplification constant 2/3 of the vertical-to-horizontal peak ground motion ratio in the seismic design of bridge.