分析了等跨布置的铁路简支梁桥在共振速度下的动力特性，及车辆运行平稳性和稳定性。
The bridge's dynamic features and train's running com fort under resonant speed of simply supported beams with equal spans are analyzed.
为避免桥梁共振，设计时应满足第一阶竖向自振频率大于车辆最大速度与车辆长度的比值。
To avoid the most dangerous resonance, the first vertical frequency of the bridge should be greater than the ratio of the maximum vehicle speed to the vehicle length in design.
我们获得了解析解，然后给出了共振频率、速度分布、振幅比和节点位置公式。
Analytical solutions were obtained, and the formulae for resonance frequency, velocity distribution, amplitude ratio and node location derived.
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