利用有限元软件ANSYS建立了一座三跨隔震桥梁三维模型,并利用Matlab编制双向隔震铁路桥梁和列车组成的车桥系统耦合振动分析程序,研究了铅芯橡胶双向隔震铁路桥梁在列车荷载作用下的动力性能.分析结果表明:隔震桥梁在横桥向的隔震周期越大,桥梁梁体在列车荷载作用下横桥向位移越大,而扭转角和竖向位移变化不明显;桥梁横桥向的隔震周期较大时,支座阻尼对列车作用引起的桥梁梁体横桥向水平振动的衰减作用更加明显;随着桥梁横桥向隔震周期的增大,车体横摆、侧滚振动位移响应显著;隔震支座阻尼对车体横摆、侧滚位移响应有一定的衰减作用;横桥向的隔震周期和隔震阻尼比的不同对车体摇头、沉浮和点头位移响应影响较小. A finite element software ANSYS was used to establish a three-dimensional model of a three-span isolated bridge. The Matlab software was used to compose the coupled vibration analysis program of the bridge system composed of two-way isolated railway bridges and trains. The results show that the greater the seismic isolation period of the isolated bridge in the transverse direction, the greater the transverse displacement of bridge girder under the load of train and the less the change of torsional angle and vertical displacement. When the isolation period of bridge transverse bridge is large, the damping effect of the support damping on the lateral horizontal vibration of the bridge beam caused by the train function becomes more obvious. With the increase of the isolation period of the bridge transverse bridge, The vibration and displacement responses of the pendulum and roll roll are significant. The damping of the vibration isolation bearing has a certain attenuation effect on the yaw and roll displacement response of the vehicle body. The different isolation cycle and isolation damping ratio of the transverse bridge shake the head, And nodding displacement response less affected.