Nonlinear Dynamic Responses of a Large Offshore Structure

摘要

It is known that great possibilities to develop ocean spaces which may be used as resident areas, airports, power stations, etc. can be provided by offshore platforms with large deck area. In order to perform the reliable design of the structure, it is required to perform nonlinear dynamic response evaluations of the response due to the dynamic forces. In this study, the dynamic response characteristics of an offshore platform with buoyancy-type large members (the hollow tubular section) subjected to wave forces are examined using nonlinear dynamic response analysis. Since the dynamic characteristics of input motions have significant roles on the response evaluations of the structure, it is important to perform the nonlinear dynamic response evaluations due to wave forces. The dynamic response analyses of the idealized models subjected to severe wave forces are carried out using the nonlinear dynamic response analysis in the time domain. It is suggested that the nonlinear dynamic response analysis can provide very significant information for the reliable response evaluations of the offshore structure.