Representative Environmental Condition for Fatigue Analysis of Offshore Jacket Substructure

Tsung-Yueh Lin, Yi-Qing Zhao and Hsin-Haou Huang
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Tsung-Yueh Lin: Research Department, CR Classification Society, Taipei 10491, Taiwan
Yi-Qing Zhao: Naval Shipbuilding Development Center, Taipei 10404, Taiwan
Hsin-Haou Huang: Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei 10617, Taiwan

Energies, 2020, vol. 13, issue 20, 1-20

Abstract: The 20-year cumulative fatigue damage of an offshore jacket substructure was estimated under the long-term local environmental conditions in the Taiwan Strait. Because of the nonlinearity of wave load for slender members of the structure, time-domain simulations of the dynamic finite element model were conducted for each sea state. By utilizing the Dirlik method to process the stress signals, the fatigue damages of joints were computed. Concerning the computational time, we propose a probability-based method of using a representative combination of environmental conditions in this study, which can considerably reduce the required number of evaluations prior to determining fatigue damage, thereby improving the process of preliminary design. The results show that only three sea states among 120 can represent 28% of the average damage ratio, and up to 17 sea states fully resolved the fatigue life.

Keywords: jacket substructure; fatigue analysis; Dirlik method; representative sea state (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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