This paper addresses the unique structural challenges associated with the design and analysis of topside module support structures for installation on FPSO decks. Specifically, this paper addresses the loading on the interface stool structures while subjected to loads originating from hull girder deformation, FPSO tank pressure loads, and topside inertial loads due to vessel motions. The results of an advanced finite element based analysis approach is presented and compared to the results of a simple design method. The effects of hull girder deformation due to vertical bending moment loading are compared to the effects of local deck deformation due to loading induced by the FPSO tank structures and topside modules.

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