非线性海床土对钢悬链式立管触地点动力响应和疲劳损伤影响分析

发布时间：2018-01-21 23:58

本文关键词： 钢悬链式立管非线性海床触地点区域动力响应疲劳损伤　出处：《海洋工程》2017年02期 　论文类型：期刊论文

【摘要】：基于钢悬链式立管(SCR)动力分析程序CABLE3D,采用大挠度柔性梁理论建立SCR的运动方程,将线性海床模型扩展为考虑海床土吸力的非线性海床模型,采用非线性有限元方法对控制方程进行离散,时域内积分采用Newmark-β法,开发出新的计算程序。通过算例分析上部浮体垂荡运动幅值、海床土剪切强度、海床土剪切强度梯度对SCR触地点区域动力响应和疲劳损伤的影响。分析结果表明:SCR触地点区域动力响应和疲劳损伤对上部浮体垂荡运动幅值和海床土剪切强度的变化较为敏感,疲劳损伤在触地点区域最大,远大于悬垂段和流线段,在设计过程中应采取一定的加强措施。
[Abstract]:Based on the dynamic analysis program CABLE3D of steel chain riser, the motion equation of SCR is established by using the theory of large deflection flexible beam. The linear seabed model is extended to a nonlinear seabed model considering the suction of the seabed soil. The nonlinear finite element method is used to discretize the governing equations and the Newmark- 尾 method is used for the integration in time domain. A new calculation program is developed. The amplitude of the vertical motion of the upper floating body and the shear strength of the seabed soil are analyzed by an example. The effect of shear strength gradient of seabed soil on the dynamic response and fatigue damage of SCR contact site is studied. The regional dynamic response and fatigue damage at the SCR contact site are sensitive to the changes of the vertical motion amplitude of the upper floating body and the shear strength of the seabed soil. The fatigue damage is the largest in the contact area, which is much larger than that in the drape section and the streamline section. Some measures should be taken to strengthen the fatigue damage in the design process.
【作者单位】：中国海洋大学工程学院;上海外高桥造船有限公司;
【基金】：国家自然科学基金资助项目(51179179;51239008)
【分类号】：P756.2
【正文快照】： 钢悬链式立管集海底管线和立管于一身,顶端通过柔性接头连接到浮式平台,底端和海底井口相连,能适应更大的水深,是海洋油气输入输出的首选立管[1]。SCR由悬垂段和流线段两部分组成,悬垂段与流线段的过渡区域称为触地点区域TDZ,在环境荷载和浮体运动的作用下,SCR在触地点区域不

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