Nonlinear Three-Dimensional Dynamic Analysis of Marine Risers

[+] Author and Article Information
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 109(3), 105-111 (Sep 01, 1987) (7 pages) doi:10.1115/1.3231334 History: Received May 15, 1986; Revised June 13, 1987; Online October 22, 2009


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.

Copyright © 1987 by ASME
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