高速铁路连续梁桥的共振响应与振动控制研究

以液体粘滞阻尼器为振动控制外部装置，主桥采用欧拉伯努利梁，通过中国和谐号动车组CRH380AL、日本新干线Shinkansen700和欧洲高速列车HSLMA8三种不同类型的高速列车对比，模拟分析了高速列车作用下桥梁结构共振响应的影响因素，以及粘滞阻尼器的阻尼系数与安装位置对桥梁结构振动响应的减振效果。研究结果表明，（1）合理有效地布置列车荷载轴距，可使桥梁结构发生基频共振的列车时速在运营时速之外，避免了桥梁结构发生较大振动峰值响应，即桥梁结构的基频共振；（2）随着粘滞阻尼器阻尼系数的增大，桥梁的加速度峰值在列车不同时速下均在减少，对桥梁振动有着不同程度的减振效果；（3）通过合理安置液体粘滞阻尼器，可有效降低高速列车作用下桥梁结构的共振响应；（4）随着粘滞阻尼器与主梁的连接点位置逐渐远离支座，粘滞阻尼器的减振效果逐渐明显；（5）随着粘滞阻尼器与桥台的连接点位置逐渐靠近支座，粘滞阻尼器的减振效果略有提升，但不明显。

Study on resonance response and vibration control of high speed railway continuous beam bridge

In this paper,a viscous fluid damper is used as an external device for vibration control.The main bridge is modelled as an Euler-Bernoulli beam.The factors affecting the resonant response of a bridge structure under the action of three types of high speed trains CRH380AL,Shinkansen700 and HSLMA8 are studied.The vibration reduction effect of viscous damper coefficient and placement position on the vibration response of bridge structure are also studied.The results show that:(1) Through reasonable and effective arrangement of train wheelbase,the train speed corresponding to the fundamental frequency resonance of the bridge structure can be kept out of the operating speed range,which avoids the large vibration response of the bridge structure,that is,the fundamental frequency resonance of the bridge structure.(2) With the increase of the damping coefficient of the viscous damper,the peak acceleration of the bridge is decreasing at different speeds of the train,and the vibration of bridge has different degrees of vibration reduction effect.(3) The resonance response of the bridge structure under high speed train can be effectively reduced through the rational placement of liquid viscous damper.(4) The damping effect of the viscous damper becomes more obvious as the connection point of the viscous damper and the main beam is gradually placed near the support.(5) As the connection point between the viscous damper and the abutment gradually near the support,the vibration reduction effect of the viscous damper is slightly improved,but this improvement is not obvious.