A numerical simulation study using AQWA software analyzed the motion response characteristics of a single floating foundation system, focusing on a floating anti-collision facility for cross-sea bridges. The study examined the hydrodynamic characteristics of the D2800-type floating foundation under wave action, specifically looking at parameters such as added mass, radiation damping, and response amplitude operator (RAO). It revealed changes in hydrodynamic characteristics related to wave period. The natural frequencies in the pitch, roll, and heave directions were found to be 2.26 s, 2.77 s, and 2.4 s, respectively. Significant changes in added mass, radiation damping, first-order wave forces, and second-order mean drift forces occurred when the wave period approached these natural frequencies. Specifically, under regular waves with unit amplitude, the added mass in the heave direction reached up to 2.8 × 105kg, and the maximum radiation damping reached up to 3.6 × 105kg/s. These changes diminished when the wave period deviated from the natural frequencies. The study also highlighted an amplification in the motion response of the floating foundation when the wave period neared its natural frequencies.