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Athanasiu C.,Multiconsult AS | Bye A.,Multiconsult AS | Tistel J.,Multiconsult AS | Ribe A.G.,Multiconsult AS | And 3 more authors.
Frontiers in Offshore Geotechnics III - Proceedings of the 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015 | Year: 2015

In earthquake related design activities for offshore structures there is a need for estimation of the earthquake loads that the structure and its foundation must carry with required safety and with displacements within acceptable limits. The subsea/wind turbine structures founded on caisson/monopile are no exception of this need. There are many challenges related to practical design of such structures, e.g.: – the need for robust, simplified procedures without excessive computational effort and/or time consuming preparation of soil input data; – the need for flexible earthquake input (either response spectra or time histories).The paper presents simplified methods that try to respond to the needs outlined above. One method is based on modal analysis where the structure is supported by non-linear springs modeling the response of soil on caisson foundation and uses the pseudo acceleration response spectrum. The second method models the structure and the caisson, the caisson resting on non-linear p-y springs and dashpots, and performs a time domain analysis for the specified earthquake time history. The main assumptions, the capabilities and limitations of the methods are discussed in the paper and illustrated by examples. © 2015 Taylor & Francis Group, London. Source

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