Water current continuously provides driving force and kinetic energy to vessels under downstream conditions. However, research has yet to elucidate the impact of the water-flow effect during vessel-bridge collisions, ...
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Water current continuously provides driving force and kinetic energy to vessels under downstream conditions. However, research has yet to elucidate the impact of the water-flow effect during vessel-bridge collisions, particularly in vessel collisions due to anchor dragging. Hence, physics-based finite-element (FE) models considering fluid-structure interactions are developed. The developed models accurately replicate the waterdriven barge collision accident of the Taiyangbu Bridge, demonstrating the rationality of the modeling method. It is found that the water-flow effect extends the duration of vessel-bridge collisions and increases the pier displacement, indicating the non-conservatism of neglecting the water-flow effect in current studies. Moreover, this study proposes a simplified analysis method considering the water-flow effect as an alternative approach to the explicit fluid-structure interaction simulation. In the proposed method, the user-defined load subroutine, loadUD, is employed to simulate the driving force of water current and achieves the equivalent of the water-flow effect through the water force-velocity relationship curve. The simplified method is demonstrated to have acceptable accuracy and efficiency compared with the fluid-structure interaction simulation. Considering the trade-off between computational efficiency and accuracy, the simplified method is more suitable for estimating the structural dynamic response of bridges subjected to vessel collisions with the water-flow effect.
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