Analysis of wind-induced vibration of fluid–structure interaction system for isolated aqueduct bridge

This paper studies the dynamic properties of aqueduct–water coupling system in bent-type aqueduct structures using the Arbitrary Lagrangian–Eulerian (ALE) method. A three-dimensional fluid–structure interaction model was established, with plate rubber supports. The speed-time sequence of fluctuating wind acting on the aqueduct was simulated by the Auto-regressive Moving Average (ARMA) model. The natural vibration characteristics, seismic responses, and wind responses of the aqueduct structure were calculated and comparatively analyzed in different conditions of water depth. The simulation results show that the application of isolation technology can reduce aqueduct stiffness and change the vibration characteristics of an aqueduct structure. The application of isolated technique is able to elevate the earthquake resistance performance of aqueduct structure. However, the isolation remarkably increases the wind stress response and reduces wind resistance performance of the aqueduct bridge.