A methodology for structural analysis and optimization of riser connection joints |
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Authors: | Felipe Alexander Vargas Bazá n,Edison Castro Prates de Lima,Marcos Queija de Siqueira,Elizabeth Frauches Netto Siqueira,Carlos Alberto Duarte de Lemos |
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Affiliation: | aCOPPE/Federal University of Rio de Janeiro, Department of Civil Engineering, Centro de Tecnologia, Bloco I-2000, Sala I-116, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ 21945-970, Brazil;bPETROBRAS, Av. Almirante Barroso, 81, 24° andar, Rio de Janeiro, RJ 20031-004, Brazil;cPETROBRAS Research and Development Center, Cidade Universitária, Quadra 7, Ilha do Fundão, Rio de Janeiro, RJ 21949-900, Brazil |
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Abstract: | In riser structural systems, the region where the riser is connected to the platform is critical due to the development of high stress levels. To reduce the stress concentration in this region, bend stiffeners and stress joints are used in order to provide a gradual stiffness transition between the riser and the platform. The present paper presents an optimization design approach for bend stiffeners and stress joints, using a slender beam procedure for the connection joint analysis and an evolution strategies multi-objective optimization algorithm. This approach produces similar results when compared to a finite element analysis of the complete riser, but with significant reduction of computational costs. Numerical examples are presented, showing the efficiency and robustness of the suggested methodology. |
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Keywords: | Bend stiffener Stress joint Structural optimization Riser analysis |
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