Dynamic response and trench development of deep-sea steel catenary riser touchdown section under floating bodies&rsquo; heave excitation

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (21) : 34-41.

Dynamic response and trench development of deep-sea steel catenary riser touchdown section under floating bodies’ heave excitation

ZHENG Mengtian1,2, YUAN Yuchao1,2, XUE Hongxiang1,2, TANG Wenyong1,2

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Abstract

Based on Randolph-Quiggin nonlinear riser-soil interaction model, dynamic response characteristics of a steel catenary riser (SCR) touchdown section under its top floating bodies’ heave excitation were studied.Touchdown elements of the SCR were developed by using the user defined element extension module (UEL) in subroutine function of ABAQUS.The rationality and effectiveness of the developed numerical model were verified and its advantages over those of the traditional linear model were discussed by comparing to model test results.The effects of amplitude and frequency of top heave excitation on seabed trench shape, riser displacement and bending moment response were deeply explored with parametric sensitivity analysis.

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steel catenary riser / nonlinear riser-soil interaction / trench development / parametric sensitivity / dynamic response

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ZHENG Mengtian1,2, YUAN Yuchao1,2, XUE Hongxiang1,2, TANG Wenyong1,2. Dynamic response and trench development of deep-sea steel catenary riser touchdown section under floating bodies’ heave excitation[J]. Journal of Vibration and Shock, 2020, 39(21): 34-41

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