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- W2502243373 abstract "This paper presents a Finite Element (FE) model for simulation of the in-situ behavior of offshore pipelines laid on a 3-D seabed, with focus on on-bottom stability, The seabed is produced in the FE model based on 3-D survey data (Digital Terrain Model, DTM) from the area where the pipeline is to be installed. In the in-place analysis part of the model, the load history of laying, flooding, pressure testing, and operation is simulated. In the on-bottom stability analysis part, wave and current loading is applied as a restart of the relevant loading condition and the dynamic behavior of the pipeline is investigated. The importance of simulating the true load history before applying the hydrodynamic loads is that it gives a more correct initial pipe configuration and force distribution prior to the stability analysis. A matter that complicates the on-bottom stability analysis of pipelines on a 3-D seabed is the fact that the hydrodynamic coefficients among other things are dependent on the seabed proximity. This problem has been solved in the FE model by calculating the gaps between the pipe and the seabed at multiple, equally spaced points along the pipe length, and calculating the hydrodynamic coefficients for drag, lift, and added mass as a function of this gap. The developed FE model may be applied to study the global static/dynamic on-bottom behavior of the pipeline, and to evaluate the effects of seabed intervention such as rock dumping and trenching. 3-D FE simulations are presented at the end of the paper as design examples." @default.
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- W2502243373 date "1999-01-01" @default.
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- W2502243373 title "A finite-element model for in-situ behavior of offshore pipelines on uneven seabed and its application to on-bottom stability" @default.
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