A static analysis procedure is formulated and implemented for the numerical determination of nonlinear static equilibrium configurations of deep-ocean risers or mining pipes. This implementation involves selection of a finite element model, modeling of structure, surface and subsurface environment and external forces, and solution of nonlinear equilibrium equations. The riser is modeled by three-dimensional beam finite elements which include axial, bending, and tornional deformations. These deformations are coupled through geometrically nonlinear effects. The resulting tangent-stiffness matrix includes three contributions identified as linear, geometric (initial-stress) and initial-displacement stiffness matrices. For the solution, a combination of load-parameter incrementation, state updating of fluid properties, and corrective Newton-Raphson iteration is used. The resulting riser configuration reflects the realistic modeling of environments and external forces. The static equilibrium solution can be used as initial condition for vibration or transient analysis. Numerical studies are presented in Part II of this paper. (Wassmann)


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    Title :

    Nonlinear static analysis of deepocean mining pipe: part I. Modeling and formulation


    Additional title:

    Nichtlineare statische Analyse von Tiefseebergbaurohrleitungen: Teil 1. Modellbildung und Formulierung


    Contributors:
    Felippa, C.A. (author) / Chung, J.S. (author)

    Published in:

    Publication date :

    1980


    Size :

    6 Seiten, 4 Bilder, 7 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English







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