Response-based environmental conditions for the design of steel catenary risers |
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Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China;2. School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China;1. Space Mechanic and Control Division, National Institute for Space Research, CEP 12227-010, São Jose dos Campos, São Paulo, Brazil;2. Department of Aerospace Engineering, Federal University of ABC, CEP 09210-580, Santo André, São Paulo, Brazil |
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Abstract: | This work presents a semi-analytical methodology to select design environmental conditions based on long-term cross-section utilization ratios at the TDZ (Touchdown Zone) for steel catenary risers. This approach uses simplified analytical models to calculate time series of short-term utilization ratios, defined according to the DnV-OS-F201 (2010) standard. After processing these time series, long-term utilization ratios can be determined with relatively low computational cost. By evaluating long-term utilization ratios, it is possible to define short-term design environmental conditions, defined as short-term conditions for which the extreme riser responses are equal to the long-term ones. This kind of methodology may represent a substantial change to the traditional focus given to riser design, which is based on responses obtained from extreme environmental conditions, instead of on the extreme responses. |
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Keywords: | Steel catenary risers Cross-section utilization ratio Long-term response Environmental design conditions Extreme load effect |
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