Two-dimensional dynamic simulation method for overall buckling of submarine pipelines introduced by modal method

Abstract

The invention discloses a complete buckling two-dimensional dynamic simulation method of a submarine pipeline provided with initial defects introduced with a modal method. The method comprises the steps as follows: finite element software ABAQUS is applied according to geometric parameters and physical and mechanical parameters of the submarine pipeline, and a characteristic buckling mode of the submarine pipeline is computed; the finite element software ABAQUS is applied according to geometric parameters and physical mechanics of the submarine pipeline and seabed soil mass, and a model used for dynamic buckling analysis is rebuilt, and the initial defects of the submarine pipeline are introduced; and a complete dynamic buckling process of the submarine pipeline is analyzed with an explicit dynamic method. According to the complete buckling two-dimensional dynamic simulation method, a slender submarine pipeline structure can be effectively simulated; moreover, completely smooth initial defects are introduced, stress concentration is prevented, and simultaneously, a plurality of modes of the submarine pipeline are introduced in an overlapping manner, so that the purpose of simulating the initial defects in the real high-order mode can be achieved; and further, the dynamic change process of the submarine pipeline in the high temperature and the high pressure can be simulated, good astringency is provided for complete buckling computation of the submarine pipeline, and a computation result can reflect the real condition better.

Description

technical field [0001] The invention relates to a two-dimensional dynamic simulation method for overall buckling of a submarine pipeline. In particular, it relates to a two-dimensional dynamic simulation method for the overall buckling of submarine pipelines that introduces initial defects based on the modal method. Background technique [0002] In order to meet the requirements of the production process, the interior of the subsea oil and gas pipeline usually has relatively high delivery pressure and temperature. Submarine pipelines are usually seamless steel pipelines. Stress accumulation occurs inside the pipe wall under the action of high pressure and high temperature. Due to the constraints of the foundation soil, the submarine pipeline cannot completely deform and release the stress. When the accumulated stress reaches a certain In a critical state, the submarine pipeline will buckle as a whole. This random and uncontrollable overall buckling is a major technical iss...

AI Technical Summary

Problems solved by technology

On the one hand, large overall buckling may lead to the increase of bending stress in the submarine pipeline, approaching or reaching the yield strength of steel, which poses a threat to the safe operation of the submarine pipeline; on the other hand, the deformed submarine pipeline is vulnerable to fishing activities and ship navigation. In addition, buckling deformation may lead to damage to the structure of the weight layer and insulation layer of the submarine pipeline or even water ingress, affecting the normal use of the submarine pipeline

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