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该文研究地震空间变异性对车桥动力相互作用的影响。依据场地特征,采用基于谱理论的无条件模拟方法产生非平稳的多点地震加速度时程;使用临界阻尼振子形式的高通滤波器对其修正,进而得到满足一致化要求的地震记录。影响空间变异性的因素均能够在该地震记录中得到充分反映。推导了绝对坐标系下考虑地震作用的车桥系统运动控制方程;其中,地震激励以位移时程形式作用到桥梁结构上。最后,选取8节车辆编组的高速列车通过3垮钢桁拱桥作为研究对象,分别进行了在地震动行波激励以及完全空间变异性激励作用下的动力响应分析;并将结果进行了对比。数值分析结果表明:车桥耦合动力分析中输入地震动需要考虑完全空间变异性的影响,这才能保证所有分析车速范围内车辆响应结果偏于安全。
The paper studies the influence of the spatial variability of the earthquake on the dynamic interaction of the axle. According to the characteristics of the site, a non-stationary multi-point seismic acceleration time-history is generated by unconstrained simulation based on spectral theory. The seismic data are obtained by using a high-pass filter in the form of critical dampener to correct the seismic records. The factors affecting the spatial variability can be fully reflected in the seismogram. The equations governing the motion of the axle system under absolute coordinate system are deduced, in which the seismic excitation acts on the bridge structure in the form of displacement time history. Finally, the dynamic response of the high-speed train with 8 vehicle groups is selected through the 3 collapsed steel truss arch bridge, and the dynamic response under the excitation of the traveling wave and the excitation of the complete spatial variability are respectively carried out. The results are compared. The numerical results show that the input of ground motions in the vehicle-bridge coupled dynamic analysis needs to consider the effect of complete space variability, which can ensure the safety of the vehicle response in all the analyzed vehicle speeds.