Investigation of the Dynamic Performance of High-Speed Railway Bridges in Cold Regions Based on Vehicle–Bridge Coupling Vibrations

Abstract

This work uses numerical simulations to systematically study the dynamic performance of high-speed railroad bridges in cold areas based on coupled vibration analyses of axles and vehicles during freeze–thaw cycles. The freezing and thawing cycles of perennial frozen soil were established with comsol software, and the changes of the soil components during freezing and thawing cycles were analyzed with an indirect solution method and reasonable hydrothermal parameters and freezing and thawing boundary conditions. With the establishment of a pile–soil interaction simulation model, the change rule for pile foundation displacement and the force characteristics of pile foundations during freeze–thaw cycles were studied. abaqus and um software were used to simulate the coupled vibrations of axles, select the indexes for evaluation of train safety and the smoothness of the high-speed railroad trains, and investigate the influence of foundation freezing and pulling displacements on the dynamic performance of high-speed trains.