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Analysis of impact loads on a self-elevating unit during jacking operation

Jonas Ringsberg (Institutionen för sjöfart och marin teknik, Marin teknik) ; Viktor Daun ; Fredrik Olsson
Journal of Offshore Mechanics and Arctic Engineering (0892-7219). Vol. 139 (2017), 3, p. 1-9.
[Artikel, refereegranskad vetenskaplig]

A method is presented that enables the analysis of weather window assessments for the installation and retrieval phases of a self-elevating unit (SEU). The method takes site-specific parameters, defined as soil type and water depth, into account in addition to vessel-specific and environmental parameters. The inclusion of site-specific parameters is the novel contribution compared to assessment methodologies used today. A simulation model is presented that incorporates a coupled non-linear time-domain analysis of vessel motion and soil-structure interaction. Soil deformation behaviour during impact is described by resistance curves based on a bearing capacity theory. A structural evaluation criterion against which impact forces are compared is used for weather window assessments. The simulation model is applied on a case study utilizing different soil types to study impact forces and the capacity of the structure for withstanding such impacts and eventually performing a weather window assessment. The results show that the jacking operation can be divided into two phases when it comes to loads on the spudcan: a phase dominated by vertical forces followed by a phase dominated by horizontal forces. It is found that including soil deformation behaviour is of paramount importance to the magnitude of the resulting impact forces and that class-recommended practice does indeed produce rather large force estimates. Thus, assessments where site-specific parameters are incorporated could definitely increase the operable weather window for SEUs, and, consequently, increase the economic competitiveness of, for example, the offshore wind industry.

Nyckelord: bearing capacity, impact loads, installation, self-elevating unit, installation, structural capacity, weather window



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Denna post skapades 2017-05-24. Senast ändrad 2017-07-05.
CPL Pubid: 249479

 

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Institutioner (Chalmers)

Institutionen för sjöfart och marin teknik, Marin teknik (2015-2017)

Ämnesområden

Energi
Materialvetenskap
Transport
Hållbar utveckling
Innovation och entreprenörskap (nyttiggörande)
Teknisk mekanik
Farkostteknik
Tillförlitlighets- och kvalitetsteknik
Konstruktionsmaterial
Marin teknik

Chalmers infrastruktur