陈振新,李捍平,李世强,蔡勇,彭维龙,陶诗洁,尹勋祥,刘臻.考虑非线性管-土接触模型的钢悬链线立管触地区动态曲率分析[J].海洋工程,2018,36(6):77~83
考虑非线性管-土接触模型的钢悬链线立管触地区动态曲率分析
Dynamic curvature in catenary risers at the touch down zone considering nonlinear riser-soil interaction
  
DOI:10.16483/j.issn.1005-9865.2018.06.009
中文关键词:  钢悬链线立管  动态曲率  触地区  非线性管土作用
英文关键词:steel catenary riser  dynamic curvature  touchdown zone  nonlinear riser-soil interaction
基金项目:交流500 kV交联聚乙烯(XLPE)海缆关键技术研究与应用(52110417000N)
作者单位E-mail
陈振新 国网浙江省电力公司舟山供电公司, 浙江 舟山 316022 zsxm2017@126.com 
李捍平 国网浙江省电力公司舟山供电公司, 浙江 舟山 316022  
李世强 国网浙江省电力公司舟山供电公司, 浙江 舟山 316022  
蔡勇 国网浙江省电力有限公司, 浙江 杭州 310007  
彭维龙 国网浙江省电力公司舟山供电公司, 浙江 舟山 316022  
陶诗洁 国网浙江省电力公司舟山供电公司, 浙江 舟山 316022  
尹勋祥 国网浙江省电力有限公司, 浙江 杭州 310007  
刘臻 中国海洋大学 工程学院, 山东 青岛 266100 liuzhen@ouc.edu.cn 
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中文摘要:
      钢悬链线立管(SCR)具有特殊的结构型式,循环载荷作用下,由于海床模型的不确定性易导致触地区产生较高的弯曲应力,引发疲劳损伤。基于非线性P-y曲线管-土接触模型,运用大挠度曲线梁模型来模拟SCR与海床土的相互作用,研究SCR在浮体二维运动和海床作用下,触地区的动态曲率变化情况。由计算结果可知:1) 由于在立管的有效张力中考虑局部曲率的影响,导致立管触地区的有效张力显著增加,并产生较高的弯矩;2) 动态分析中,分别运用线弹性海床和非线性海床模型,研究立管触地区的相对曲率随相对时间的变化曲线,表明非线性海床将使触地区的相对曲率具有明显的非线性,且有多个峰值,变化幅度较大,并出现反向曲率;3) 垂荡运动比纵荡对曲率的影响大,且运动幅值越大,影响越明显。
英文摘要:
      The TDP of SCR, having especial structural form, attracts the worst bending stresses due to the cyclic loads and is subject to the greatest uncertainties, such as those arising from the riser seabed contact. SCR-soil interaction is simulated by the nonlinear P-y curve and SCR is simulated by flexible curve beam with large curvature. The dynamic curvature at TDP is studied when an oscillatory motion and pipe soil interaction are applied to the riser. The results are shown in figures and indicate that: 1) Due to the influence of local curvature in the effective tension, effective tension at TDZ of riser is significantly increased and the bending moment is the highest in static analysis; 2) In the dynamic analysis, the variation trends of relative curvature at TDZ with relative time are presented considering the linear elastic and nonlinear seabed model. The comparative analysis by useing a nonlinear seabed model shows that the curves have obvious nonlinearity and multiple peaks, and the variation amplitude of curvature is very large and there are reverse curvatures; 3) The effect of heave motion on curvature is greater than that of surge oscillation, and the effect is more obvious with the increase of motion amplitude.
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