Marine risers are modeled as thin-walled, slender, extensible or inextensible, tubular beams subject to nonlinear three-dimensional hydrodynamic loads of interactive nature, torsion and distributed couples, inertia forces and varying axial tension. A finite element, time-incremental algorithm is developed which utilizes equilibrium and kinematic constraints to reduce the required computational time. Iterations are used within each increment to assure convergence of deformation, stiffness matrices and external loads. The algorithm is implemented numerically and the developed computer code is used in several numerical applications to show that a structurally linear model may not be accurate enough and may occasionally be nonconservative in predicting the dynamic riser response.
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September 1987
Research Papers
Nonlinear Three-Dimensional Dynamic Analysis of Marine Risers
J. E. Kokarakis,
J. E. Kokarakis
Mechanical Engineering Group, Failure Analysis Associates, Palo Alto, Calif. 94303
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M. M. Bernitsas
M. M. Bernitsas
Department of Naval Architecture and Marine Engineering, The University of Michigan, Ann Arbor, Mich. 48109
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J. E. Kokarakis
Mechanical Engineering Group, Failure Analysis Associates, Palo Alto, Calif. 94303
M. M. Bernitsas
Department of Naval Architecture and Marine Engineering, The University of Michigan, Ann Arbor, Mich. 48109
J. Energy Resour. Technol. Sep 1987, 109(3): 105-111 (7 pages)
Published Online: September 1, 1987
Article history
Received:
May 15, 1986
Revised:
June 13, 1987
Online:
October 22, 2009
Citation
Kokarakis, J. E., and Bernitsas, M. M. (September 1, 1987). "Nonlinear Three-Dimensional Dynamic Analysis of Marine Risers." ASME. J. Energy Resour. Technol. September 1987; 109(3): 105–111. https://doi.org/10.1115/1.3231334
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