For a pipeline laid as an arc,the bending moment and axial force of the pipeline are calculated using finite element method based on the actual geometric shape after dragging.After calculation,the bending moment is the control load,and the maximal load position occurs in the inflection point area of the pipeline.The sensitivity analysis is conducted on different offset distances.As the pipeline in the upper arch area shifts towards the lower arch,the maximal bending moment increases from 60.2 kN·m to 62.8 kN·m.As the pipeline in the lower arch area shifts towards the upper arch,the maximal bending moment increases significantly,from 64.4 kN.m to 74.4 kN m,with an increase of 15.5％.The calculation shows that in the maximal offset area of the pipeline,the impact of the offset on the bending moment of the pipeline is more significant.
submarine pipelinedrag offsetfinite element analysis
NETL
NSTL
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