Geometrical Nonlinearity in Offshore Pipelinesby Bulent A. Ovunc, Univ of Southwestern Louisiana, United States,
Abstract: Pipelines are very flexible structural systems which are subjected to various boundary conditions. For instance, during the laying process, the pipes roll on the guidance tracks on the barge, slides freely on the stinger and repose on the floor of the sea. The loads acting on the deformed configuration of the pipelines are its own weight, tension applied at the barge, the buoyancy force varying with the depth of the water and loads due to water currents. Due to the large deformations in the suspended submarine pipelines, the geometrical nonlinearity must be considered in their structural analysis. For the geometrically nonlinear analysis, the differential equations of equilibrium are expressed on the deformed configuration in Eularian coordinates.
Subject Headings: Offshore pipelines | Deformation (mechanics) | Geometrics | Nonlinear analysis | Structural systems | Barges | Ultimate strength | Load factors
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