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Ivanov L.D.,American Bureau of Shipping | Ku A.,Energo Engineering | Huang B.-Q.,Energo Engineering | Krzonkala V.C.S.,Abs Consulting
Ships and Offshore Structures | Year: 2011

The widespread practice for presentation of the still water loads acting on the hull structure of a floating production storage and offloading facility (FPSO) is to use the individual amplitude statistics. When the probability density function of the loads is built, its integration provides the probability of exceeding any given level of loads. Also, once it is available, one can apply the principles of extreme value statistics to obtain the highest value in any number of cycles. The individual amplitude statistics are used in fatigue strength calculations, while the extreme value statistics can be used in ultimate strength calculations. An example is given for the probability density functions of a sample FPSO when the two approaches are applied for assessment of the total hull girder load that can be applied for calculation of its ultimate strength. © 2011 Taylor & Francis. Source

Chen J.-Y.,Energo Engineering | Gilbert R.B.,University of Texas at Austin | Puskar F.J.,Energo Engineering | Verret S.,Energo Engineering
Journal of Geotechnical and Geoenvironmental Engineering | Year: 2013

The objective of this paper is to document and study the failure of a driven, steel pipe pile foundation system supporting an offshore platform. The three-pile system failed in overturning because of a pull-out failure of the most critically loaded pile in a hurricane 5 years after installation. The calculated tensile capacity of this pile using the American Petroleum Institute (API) design method is close to the estimated load at failure. This case history is significant because it represents the failure of a large-diameter pile in service when loaded by a storm. Also, this case history generally affirms the current design methods and contradicts a widely held perception that offshore pile designs are significantly conservative. This case history highlights the opportunities to improve design practice by explicitly accounting for pile flexibility when dealing with strain-softening soils and by considering the capacity of the foundation system as well as the capacity of individual piles in design. © 2013 American Society of Civil Engineers. Source

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