In this paper, the dynamic amplification factors (DAFs) of high-speed railway continuous girder bridges are studied. The vehicle-bridge interactions (VBIs) of 13 concrete continuous girder bridges with spans ranging from 48 to 130 m are analyzed, the influences of the train speed, the train marshalling and the bridge fundamental frequency on the DAF are investigated, and the DAF design standard for high-speed railway bridges is discussed. The results indicate that for the continuous beam bridge whose fundamental frequency is less than 3.0 Hz, the maximum DAF is no more than 1.15; while for the bridge examples with a fundamental frequency larger than 3.0 Hz, the maximum DAF reaches 1.25 because the resonance occurs at high train speed. The empirical formulas of the DAFs in the Japan Railway Technical Research Institute (JRTRI) code could provide a conservative estimation of the DAFs of high-speed railway continuous bridges.

本文研究了高速铁路连续梁桥的动力放大系数。分析了跨度在48至130 m之间的13座混凝土连续梁桥的车桥相互作用（VBI），研究了列车速度，列车编组和桥梁基频对DAF的影响，并进行了DAF设计讨论了高速铁路桥梁的标准。结果表明，对于基频小于3.0 Hz的连续梁桥，最大DAF不大于1.15；而对于基频大于3.0 Hz的电桥示例，最大DAF达到1.25，因为在高列车速度下会发生共振。