Flexible floating anti-collision systems (FFASs) have been proved to be an effective method to prevent the possible collision between the uncontrolled vessels and marine structures. At the same time, the dynamic responses of the system under harsh waves are essential for the design and assessment of the FFAS. In the present study, a wave basin experiment was performed to investigate the wave-induced dynamic responses of a FFAS, which was consisted of five horizontal floating buoys both connecting and mooring with flexible lines. Extensive measurements were carried out to quantify the motion responses of the central and adjacent buoys with different wave heights and wave periods. The results shows that the sway and roll motion are significantly enhanced around the natural periods, which would greatly threaten the offshore and onshore mooring lines. Due to the coupling effect of the motion components, the surge difference between the adjacent buoys also got a peak value around the sway natural period, which directly threaten the block lines.
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