Performance of non-linear seabed interaction models for steel catenary risers,part II: global response |
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| Institution: | 1. School of Civil and Environmental Engineering, Cornell University, 220 Hollister Hall, Ithaca, NY 14853, United States;2. Center for Applied Mathematics, Cornell University, 657 Frank H.T. Rhodes Hall, Ithaca, NY 14853, United States;3. Asian School of the Environment, Nanyang Technological University, 62 Nanyang Dr, Singapore, 637459, Singapore;1. COPPE/UFRJ, Department of Civil Engineering, Centro de Tecnologia, Bloco I2000, Sala I216, Cidade Universitária, Ilha do Fundão, Rio de Janeiro CEP 21945-970, Brazil;2. COPPE/UFRJ, Department of Mechanical Engineering, Centro de Tecnologia, Bloco G, Sala 201, Cidade Universitária, Ilha do Fundão, Brazil;3. CENPES/Petrobras, Rio de Janeiro, Brazil;1. SEISMIC Ingeniería y Construcción, S.A. de C.V., Insurgentes Sur #885, Primer Piso, Col. Nápoles, 03810 Mexico City, Mexico;2. Instituto Mexicano del Petróleo, Eje Central Lazaro Cardenas 152, Col. San Bartolo Atepehuacan, 07730 Mexico City, Mexico;3. Universidad de Colima, Facultad de Ingeniería, km. 9 carretera Colima-Coquimatlán Coquimatlán, 28400 Colima, Mexico |
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| Abstract: | Fatigue response of steel catenary risers (SCR) in the touchdown zone (TDZ) is significantly affected by riser-seabed interaction. Non-linear hysteretic riser-seabed interaction models have been recently developed to simulate the SCR cyclic embedment into the seabed. Despite the advancements achieved in the prediction of non-linear hysteretic riser-seabed interaction, several inconsistencies have been recently identified in the nodal performance of some of the popular models. These limitations need to be resolved by proposing new models or improving the existing models. However, it is necessary to evaluate the influence of the identified shortcomings of the existing models on the global performance of the riser. In this paper, the influence of nodal inconsistencies observed in a popular riser-seabed interaction model on the global performance of the riser was comprehensively examined in the TDZ. The riser embedment profile, cyclic contact stress, contact stress envelop, mean shear force, cyclic bending moment, and consequently the cumulative fatigue damage was investigated. The study showed that the soil model overestimates the riser embedment and other global responses. Recommendations were made to overcome the identified shortcomings of the existing models in future developments. |
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| Keywords: | Steel catenary risers Non-linear seabed interaction Numerical modeling Stress profiles Fatigue life |
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