Two of authors presented the calculation method of a vertical shear force and a bending moment induced on a pontoon type floating structure in taking accounts of its motions. In this method, the coefficients of radiation forces is computed by use of the Ito's 2-dimensional approximate theory, which are easily computed by means of a personal computer. The shear force and the bending moment induced on a pontoon type floating structure in relatively shallow water have been calculated by use of this method. However, it was found that the added mass of heaving motion and the added inertia moment of rolling motion are not adequate in deep water.
　In this report, the Kihara's strict solution on radiation forces of a 2-dimensional floating structure is adopted. Besides of vertical shear forces and bending moments, torsional moments, horizontal shear forces and bending moments are also calculated in this report.