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Author(s): A. A. Golbini Mofrad , N. Szilard. Galgoul , E. A. Nascimento, R. S. Antunes
Pages: 1-5 Paper ID:171005-1801-4848-IJCEE-IJENS Published: February, 2018
Abstract:-- Stingers are structures which are attached to pipelay barges in order to produce a smooth angular transition between the almost horizontal flat barge surface, where the pipelines are assembled and welded, and the catenary shape of the pipe as it descends towards the seabed. This definition has an S-lay in mind, where the pipe forms an S-shape between the barge and the seabed. The design of these structures for pipe laying purposes is a complex task because of the multiple load sources to which the stinger is subjected. There are dead loads, both of the stinger itself and the pipeline that it supports, there are inertial loads caused by the motions of the vessel, there are wave and current loads, which induce the vessel motions but which produce loads on the stinger and pipeline directly and finally there are dynamic loads induced by the interaction of the pipeline with the seabed and its lifting from the stinger supports, thus causing impact on these same supports when they re-contact them. These loads are of nonlinear nature wherefore a time history method is the best analysis type to evaluate their effects on the stinger. One of the main problems found by engineers in the market regarding the design of this type of structure is finding a software that can handle it. There are several offshore structural packages that can deal with waves and vessel motions, but can´t handle the pipeline simultaneously, and there are also several pipeline programs that could do the job but deal with pipeline type structures only and can´t handle structural frames. The objective of this paper is to show how one of these software systems of the second group was taken and supplemented with punching shear verifications in order to handle the job.
Keywords: Offshore Structures, Stinger, Pipelay, Nonlinear, Time Domain, Analysis.
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