By finite element software, the natural vibration characteristics and vehicle-bridge coupling dynamic response of Shuangliu Bridge were analyzed, which was a bridge with a main span of 108 m in Yichang-Wanzhou Railway. Its natural vibration characteristics, vibration mode and damping ratio were tested by pulsating method. With dynamic load test, its strain,displacement and acceleration time-history response were tested under the conditions that the train passed or braked on the bridge at different velocities. The test and analysis results show that, this bridge had enough vertical stiffness, transverse stiffness and strength, and its dynamic property was good, and the safety and stability were good when the train passed on it.%运用有限元软件分析主跨108 m的宜万铁路双流大桥主桥的自振特性及车桥耦合动力响应.采用脉动法测试桥梁的自振频率、振型及阻尼比,通过全桥动载试验测试列车以不同速度通过桥梁和在桥上制动时桥梁的应变、位移及加速度时程响应.通过实测与计算结果的比较分析表明,该桥具有良好的竖向、横向刚度和结构强度,结构动力性能良好,列车运行安全性与平稳性较好.
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