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dc.contributor.authorHorn, Jan-Tore Haugan
dc.contributor.authorAmdahl, Jørgen
dc.contributor.authorHaver, Sverre Kristian
dc.date.accessioned2016-01-11T10:15:12Z
dc.date.accessioned2016-05-04T13:59:30Z
dc.date.available2016-01-11T10:15:12Z
dc.date.available2016-05-04T13:59:30Z
dc.date.issued2015
dc.identifier.citationIEEE, . [Eds.] Proceedings of OCEANS'15 MTS/IEEE Washington Conference & Exhibition p. 1-9, IEEE conference proceedings, 2015nb_NO
dc.identifier.isbn978-0-933957-43-5
dc.identifier.urihttp://hdl.handle.net/11250/2388655
dc.description.abstractOffshore bottom-fixed structures, such as jackets, are typically designed with a natural period of 3 seconds or less. This means that there is limited dynamic excitation from wave loads at design sea-states. The benefit of this is reduced uncertainties from the dynamic effects in the design phase. However, some jacket structures in deep water or soft soilconditions may have natural periods exceeding 4 seconds, which implies large dynamic effects. For a jack-up, industry guidelines are developed to account for the dynamic structural response in both ULS and FLS conditions. Although advanced methods are available to determine the dynamic amplification factors (DAF), they are unsuitable to estimate the dynamic response in the concept design phase. The current simplified method is based on a single-degree-of-freedom (SDOF) system. However, the estimator is not very accurate for the DAF of a structure in irregular seas, and must be used with caution. The most correct method for estimating the extreme static and dynamic responses is stochastic time-domain simulation. In this paper, it is investigated whether an analytical formulation is appropriate for DAF in irregular seas, as a function of natural period. The models used are a slender cylinder and a dynamically sensitive jacket, in an extreme seastate. Non-linear quasi-static and dynamic time-domain analysis are carried out with USFOS, a computer program especially designed for space frame offshore structures, using linear wave theory and the Morison equation.nb_NO
dc.language.isoengnb_NO
dc.publisherIEEE conference proceedingsnb_NO
dc.relation.ispartofseriesOCEANS'15 MTS/IEEE;
dc.titleDynamic Amplification of Drag Dominated Structures in Irregular Seasnb_NO
dc.typeChapternb_NO
dc.typeConference objectnb_NO
dc.typePeer reviewednb_NO
dc.typeJournal articleen_GB
dc.date.updated2016-01-11T10:15:12Z
dc.identifier.cristin1309737
dc.relation.projectNorges forskningsråd: 223254nb_NO
dc.description.localcode(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or tion to servers or lists, or reuse of any copyrighted components of this work in other works.nb_NO


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