Compound stochastic dynamic response investigation of train-multi-span simply supported beam bridge coupling system based on design of experiment modeling

Abstract

Discreteness of structural parameters and randomness of rail irregularities cause uncertainty in a train-bridge coupling system. We propose an efficient approach to carefully study the effect of these uncertainties on the dynamic responses of a bridge and vehicles. First, a compound stochastic vibration model of a train-bridge coupling system was established, employing the Monte Carlo method in the sample simulations. Second, the discreteness of the system parameters, the randomness of three types of rail irregularities, and the vehicle velocity were screened using the Taguchi method; influencing factors on the system dynamic responses were obtained. Third, the individual and joint effects of these factors were carefully studied using the response surface method function charts from a statistical point of view. Finally, we determined the optimal conditions of the dynamic responses.