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Dynamic Amplification of Drag Dominated Structures in Irregular Seas

Horn, Jan-Tore Haugan; Amdahl, Jørgen; Haver, Sverre Kristian
Chapter, Conference object, Peer reviewed, Journal article
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URI
http://hdl.handle.net/11250/2388655
Date
2015
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  • Institutt for marin teknikk [2412]
  • Publikasjoner fra CRIStin - NTNU [20946]
Original version
IEEE, . [Eds.] Proceedings of OCEANS'15 MTS/IEEE Washington Conference & Exhibition p. 1-9, IEEE conference proceedings, 2015  
Abstract
Offshore 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.
Publisher
IEEE conference proceedings
Series
OCEANS'15 MTS/IEEE;

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