Train-bridge system dynamics analysis with uncertain parameters based on new point estimate method

In the analysis of train-bridge coupled vibration system, randomness of parameters of high-speed railway bridge cannot be ignored. The new point estimate method (NPEM) is a kind of accurate and efficient method to calculate the random response and reliability. In this paper, NPEM is applied to analyze the random dynamic responses of 3D train-bridge coupled system with random parameters, including parameters of bridge materials, environment factor and prestressing parameters. Newmark-beta approach is applied as the integration algorithm, and the Monte Carlo method is used to validate the feasibility of the NPEM. The results show that NPEM can be combined with random system accurately and efficiently. Furthermore, the influences of different random parameters distributions are discussed.