Kramers, Job; Janssen, Joost; Hofstede, Hugo; Horte, Torfinn; Drake, Kevin; (2023) Structural reliability analysis for crane operability conditions of offshore wind farm (OWF) jack-ups. In: Proceedings of the International Conference: The Jack-Up Platform - Design, Construction & Operation 2023. City, University of London: London, UK.

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Abstract

A structural reliability analysis has been performed as part of the Jack-up Renewable Energy Guidelines (J-REG) Joint Industry Program (JIP) which aimed to produce guidance specific to Offshore Wind Farm (OWF) jack-ups that is lacking in the current ISO Standard (ISO 19905-1) developed for the Oil and Gas Industry. One of the aspects for which no guidance exists currently is related to load and resistance factors for site-specific assessment of crane lift operating conditions of OWF jack-ups. A gap was identified in the existing ISO 19905-1 standard for operational foundation safety since this standard considers extreme storm conditions that rarely happen whereas OWF jack-ups use their main crane to lift heavy wind turbine components into place. These operations are performed during mild (restricted) weather conditions and on a frequent basis. In the structural reliability analysis that has been performed several typical OWF jack-ups, varying in leg and jacking system type as well as size, have been analyzed for three defined soil conditions assumed to represent soil risk profiles ranging from low to medium to high. The study has been a collaboration between ABS, GustoMSC and DNV. ABS has focused on the spudcan foundation loaddisplacement behaviour, GustoMSC on the structural load and strength accounting for both crane load (effects) as well as a non-linear foundation model and DNV on the reliability analysis and calibration of safety factors. The initial phase of determining the spudcan foundation behaviour has been presented in an earlier paper. The present paper focuses on the load and reliability analyses. A target reliability level was agreed with participants in the J-REG JIP and for that load and resistance factors have been derived that were recommended for site-specific assessment of crane operational conditions for OWF jack-ups. The aim of this reliability analysis was to provide input to the J-REG JIP participants and to support them in preparing guidance text to include in the J-REG Guideline.

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