Finite element simplified fatigue analysis method for a non-tubular joint of an offshore jacket platform |
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Authors: | Qinghua Bao Heng Feng |
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Institution: | 1. China National Petroleum Offshore Engineering Co. Ltd., Beijing, 100176, China
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Abstract: | This paper proposes the finite element simplified fatigue analysis method for fatigue evaluation of the composite non-tubular
joint structure of an offshore jacket subjected to wave loads. The skirt pile sleeve of the offshore jacket, which had been
in service, was taken as an example of the non-tubular joint structure. SACS software was used for global analysis of multi-directional
wave loads for the jacket platform, and ALGOR software was used to build a finite element model, perform finite element analysis,
post-process stress results for acquiring the stress range, and perform fatigue evaluation. The analysis results indicate
that the extreme stress range is within the allowable stress range and meets the requirements of DNV code. That means the
simplified fatigue analysis method is effective and can be used in fatigue design for the non-tubular joint structure of an
offshore jacket. |
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Keywords: | |
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