DYNAMIC FLUID-STRUCTURE INTERACTION ANALYSIS OF GASBAG-TYPE FLOATING BRIDGES UNDER WAVE IMPACT

The numerical simulation analysis of gasbag-type floating bridges (GTFBs) under various conditions were studied using the multi-material ALE (Arbitrary Lagrangian-Eulerian) method. The fluid was described by the ALE method, the structure was described by the Lagrangian method and the coupling process between the structure and fluid was achieved by the penalty method. Floating bridge-fluid coupling models were constructed. The models and approaches were validated by comparing with the wave theory and experimental data. The structural responses of the GTFB under gravity, moving load and wave impact were analyzed. The results show that the vertical displacement and stress of the gasbag were raised by increasing the mass of the moving load. Compared with the land condition, the vertical displacement of the gasbag increases and the stress reduces significantly. The maximum contact force of the hinge and the maximum stress of the gasbag appear at the ends of the floating bridge, and the maximum bending moment of the hinge appear in the middle section. The stress of the gasbag was raised by increasing the height of the wave.