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The structure is expected to be so large that the analysis of the hydrodynamic forces that will act on the structure by a conventional numerical technique is practically impossible because of the required huge computational burden. In order to overcome this difficulty, an approximate but quite accurate numerical method for the analysis of a diffraction problem was presented in the 1st report. The method exploits the fact that the structure is very large and assume a certain uniformity in the flow field around the structure except at the vicinity of the perimeters of the structure. The present paper extends the method to the analysis of a radiation problem (including that due to elastic motions) and shows that a similar approximate technique can be used in the analysis. In addition, as examples of the application of the presented method to some practical problems, an analysis of elastic responses of a very large floating structure in waves and an analysis of wave forces on a floating airport composed of two runway structures are carried out."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420282801185811072","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"40214275"},{"@type":"NRID","@value":"1000040214275"},{"@type":"NRID","@value":"9000020364192"},{"@type":"NRID","@value":"9000020276578"},{"@type":"NRID","@value":"9000020364409"},{"@type":"NRID","@value":"9000020518631"}],"foaf:name":[{"@language":"en","@value":"Kagemoto Hiroshi"},{"@language":"ja","@value":"影本 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