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提出了在路面随机谱激励下,将多个参数变量进行分离,两两组合,并按不同基准对车-桥振动的动力放大效应进行归类分析的方法。建立了考虑路面随机激励的车-桥振动微分方程组,计算了系统中的动力放大系数并赋予其点、线、面的几何意义;定义了路面不平顺谱放大系数,并以响应类型、车速、路面不平顺等级为标准进行了计算、归类分析。结果表明:车-桥系统的动力放大效应总体上随车速及路面不平顺等级的增大而增大;在不同路面不平顺等级下,桥的动力放大系数小于车的动力放大系数;同时,路面不平顺等级显著影响车与桥的动力放大系数;工程上应重视对路面的维护,以减小对桥梁结构的冲击,降低车辆行驶的振动。
A method of separating and combining a plurality of parameter variables under the random spectrum excitation of the pavement is proposed, and the power amplification effects of the vehicle-bridge vibration are classified and analyzed according to different standards. The differential equations of vehicle-bridge vibration considering the random excitation of the pavement are established. The dynamic magnification coefficient in the system is calculated and given its geometrical significance of point, line and surface. The magnification factor of road roughness is defined, and the response type, speed , The road roughness level as the standard calculation, classification analysis. The results show that the dynamic amplification effect of vehicle-bridge system generally increases with the increase of vehicle speed and uneven road surface; under different road surface irregularities, the dynamic amplification factor of the bridge is less than that of vehicle; meanwhile, Uneven levels significantly affect the car and bridge dynamic amplification factor; Engineering should pay attention to the maintenance of the pavement to reduce the impact on the bridge structure and reduce vehicle vibration.