Prediction model of vehicle-induced vibration of metro depot superstructure based on impedance and power conservation method

Here, to evaluate effects of vehicle-induced vibration response of metro depot superstructure on human comfort and guide design of vibration reduction and isolation measures, taking a steel frame superstructure of a certain metro depot in Shenzhen as the study object, a computationally efficient vertical vibration prediction model was proposed based on the wave propagation theory. The proposed model was composed of two sub-models. The sub-model 1 based on the impedance method considered vertical vibration propagating upward along the structural column in the form of axial wave, and the support column foot vibration velocity of the whole superstructure platform was used as the input to predict column foot vibration response of each floor of the superstructure. The sub-model 2 considered the beam-slab combined effect, the driving point impedance at the beam end was derived. Column foot vibration velocities calculated in the sub-model 1 were used as inputs, respectively to predict the space-time average vibration response of each floor based on the principle of power conservation. By comparing the calculated results using the prediction model with the onsite actually measured results, the effectiveness of the prediction model was verified. It was shown that the study results can provide an efficient and simple scientific prediction method and theoretical basis for vehicle-induced vibration of metro depot superstructures. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.