中文摘要：

铁路桥梁的动力行为（动挠度、动加速度）是桥上高速列车运行安全控制的重要指标之一。为此,基于列车动力指纹线和桥梁动力指纹线的概念,将列车激励简化为一组移动集中力,从理论上推导出了列车动力指纹线的数学表达式,提出了简支梁跨中竖向最大加速度的简化计算方法,据此得到车桥发生共振时列车速度,从而可以快速计算简支桥梁的动力行为。通过实例验证了文中方法的可行性,并分析了车桥共振的发生机理、影响参数,以及桥梁加速度计算时高频成分的影响。

英文摘要：

The dynamic behavior of railway bridges （dynamic deflection and acceleration） is one of the running safety control indices for high-speed trains. Therefore, the dynamic behavior of railway bridges is studied based on the concept of the dynamic signatures of the train and the bridge. By simplifying the train excitation as a series of moving concentrated forces, the mathematical expressions of the dynamic signatures of the train are obtained through theoretical derivations, and then a method is presented for calculating the resonance speed of trains and the maximum vertical acceleration of the bridge. With this method, the dynamic responses of the simple supported bridge can be calculated quickly. The feasibility of this method is validated through some examples, in which the resonance mechanism of train-bridge system and the influencing factors are investigated. In addition, the effect of high frequency components to the bridge acceleration is also analyzed.