This study focuses on the floating breakwater system moored by a three-line shared suction anchor. A numerical model under wave loading is established using AQWA and OrcaFlex software to investigate the effects of wave randomness and wave direction variations on the resultant load magnitude and directional frequency distribution of the shared anchor. The results indicate that, compared with the conventional single-line anchor, the three-line shared anchor can reduce the average resultant load through vector cancellation of multi-line tensions, with a reduction of approximately 81% under irregular wave conditions. Under irregular waves, tension of the predominantly loaded mooring line and the peak resultant load on the shared anchor are both higher than those under regular waves, exhibiting a dynamic amplification effect. The load direction of the conventional single-line anchor is mainly determined by the layout orientation of mooring lines, whereas the resultant load direction of the three-line shared anchor is jointly influenced by the wave incidence angle and the geometric symmetry of the system. When the wave direction approaches a particular mooring line or a symmetry axis of the system, the resultant load direction tends to concentrate along the corresponding axial direction. The findings provide a reference for load assessment and preliminary design of floating breakwaters employing shared anchor foundations.

floating breakwater,shared anchor,resultant load,numerical simulation