Floating unit, mooring lines and risers comprise an integrated dynamic system that respond to environmental loading due to wind, waves and currents in a complex way. Correct consideration of wave energy spreading may be extremely significant for the floating unit response and the mooring and riser system integrity assessment as the directional spectrum induce vessel coupled responses. The riser and system response of a spread-moored Floating, Production, Storage and Offloading unit (FPSO) is assessed employing a cos2s function for the wind-generated wave spreading acting together with a unidirectional swell system. A coupled dynamic analysis is performed considering simultaneously the dynamics of the vessel and of the slender structural system. A case study is presented and the results assessed considering typical offshore Brazilian conditions.
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