Structural stability of flexible lines in catenary configuration under torsion

Autor(es)

Gay Neto, Alfredo ^[1] ; Martins, Clovis de Arruda ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Struct & Geotech Engn, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Dept Mech Engn, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MARINE STRUCTURES; v. 34, p. 16-40, DEC 2013.
• Citações Web of Science: 14

Resumo

Catenary risers can present during installation a very low tension close to seabed, which combined with torsion moment can lead to a structural instability, resulting in a loop. This is undesirable once it is possible that the loop turns into a kink, creating damage. This work presents a numerical methodology to analyze the conditions of loop formation in catenary risers. Stability criteria were applied to finite element models, including geometric non-linearities and contact constraint due to riser-seabed interaction. The classical Greenhill's formula was used to predict the phenomenon and parametric analysis shows a ``universal plot{''} able to predict instability in catenaries using a simple equation that can be applied for typical risers installation conditions and, generically, for catenary lines under torsion. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/09912-0 - Dinâmica não linear de risers incluindo o contato unilateral com o fundo do mar
• Beneficiário: Alfredo Gay Neto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 06/06277-0 - Análise dinâmica linear e não-linear de cabos submersos
• Beneficiário: Alfredo Gay Neto
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 12/21167-8 - Técnicas para a análise computacional do problema de contato em risers
• Beneficiário: Alfredo Gay Neto
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado