Reliability of design approaches for axially loaded offshore piles and its consequences with respect to the North Sea

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dc.identifier.uri Schmoor, Kirill A. Achmus, Martin Foglia, Aligi Wefer, Maik 2018-10-25T07:34:14Z 2018-10-25T07:34:14Z 2018
dc.identifier.citation Schmoor, K.A.; Achmus, M.; Foglia, A.; Wefer, M.: Reliability of design approaches for axially loaded offshore piles and its consequences with respect to the North Sea. In: Journal of Rock Mechanics and Geotechnical Engineering 10 (2018), S. 1112-1121. DOI:
dc.description.abstract In the near future, several offshore wind farms are planned to be built in the North Sea. Therefore, jacket and tripod constructions with mainly axially loaded piles are suitable as support structures. The current design of axial bearing resistance of these piles leads to deviant results regarding the pile resistance when different design methods are adopted. Hence, a strong deviation regarding the required pile length must be addressed. The reliability of a design method can be evaluated based on a model error which describes the quality of the considered design method by comparing measured and predicted pile bearing resistances. However, only few pile load tests are reported with regard to the boundary conditions in the North Sea. This paper presents 6 large-scale axial pile load tests which were incorporated within a new model error approach for the current design methods used for the axial bearing resistance, namely API Main Text method and cone penetration test (CPT)-based design methods, such as simplified ICP-05, offshore UWA-05, Fugro-05 and NGI-05 methods. Based on these new model errors, a reliability-based study towards the safety was conducted by performing a Monte-Carlo simulation. In addition, consequences regarding the deterministic pile design in terms of quality factors were evaluated. It is shown that the current global safety factor (GSF) prescribed and the partial safety factors are only valid for the API Main Text and the offshore UWA-05 design methods; whereas for the simplified ICP-05, Fugro-05 and NGI-05 design methods, an increase in the required embedded pile length and thus in the GSF up to 2.69, 2.95 and 3.27, respectively, should be considered to satisfy the desired safety level according to DIN EN 1990 of β = 3.8. Further, quality factors for each design method on the basis of all reliability-based design results were derived. Hence, evaluation of each design method regarding the reliability of the pile capacity prediction is possible. eng
dc.language.iso eng
dc.publisher Amsterdam : Elsevier B.V.
dc.relation.ispartofseries Journal of Rock Mechanics and Geotechnical Engineering (2018)
dc.rights CC BY-NC-ND 4.0 Unported
dc.subject Global safety factors (GSFs) eng
dc.subject Model error eng
dc.subject Pile load test eng
dc.subject Quality factors eng
dc.subject System reliability eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.subject.ddc 690 | Hausbau, Bauhandwerk ger
dc.title Reliability of design approaches for axially loaded offshore piles and its consequences with respect to the North Sea
dc.type Article
dc.type Text
dc.relation.issn 1674-7755
dc.bibliographicCitation.volume 2018
dc.bibliographicCitation.firstPage 1112
dc.bibliographicCitation.lastPage 1121
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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