Exact nonstationary responses of rectangular thin plate on Pasternak foundation excited by stochastic moving loads. (6th January 2018) - Chen, Guohai
Abstract: This paper develops an efficient method termed as PE-PIM to address the exact nonstationary responses of pavement structure, which is modeled as a rectangular thin plate resting on bi-parametric Pasternak elastic foundation subjected to stochastic moving loads with constant acceleration. Firstly, analytical power spectral density (PSD) functions of random responses for thin plate are derived by integrating pseudo excitation method (PEM) with Duhamel's integral. Based on PEM, the new equivalent von Mises stress (NEVMS) is proposed, whose PSD function contains all cross-PSD functions between stress components. Then, the PE-PIM that combines the PEM with precise integration method (PIM) is presented to achieve efficiently stochastic responses of the plate by replacing Duhamel's integral with the PIM. Moreover, the semi-analytical Monte Carlo simulation is employed to verify the computational results of the developed PE-PIM. Finally, numerical examples demonstrate the high accuracy and efficiency of PE-PIM for nonstationary random vibration analysis. The effects of velocity and acceleration of moving load, boundary conditions of the plate and foundation stiffness on the deflection and NEVMS responses are scrutinized. Highlights: The efficient semi-analytical PE-PIM for exact nonstationary response is developed. Analytical PSD functions of nonstationary responses for pavement system are derived. New time-varying PSD formula of equivalent von Mises stress is proposed. Semi-analytical MCS-PIM in time domain is presented to verify PE-PIM and PE-DM.