摘要
基于考虑海底接触的钢悬链式立管(Steel Catenary Riser,SCR)的结构特性,采用考虑管土分离的线性截断模型对p-y曲线进行描述。通过在立管顶端施加固定的水平位移模拟上端浮体的水平漂移,分别研究立管外径、立管壁厚、管内流体介质以及海流流速的变化对立管位移响应以及等效应力的影响。分析结果表明:立管位移响应随着壁厚和内部流体密度的增加呈下降趋势,随着海流流速的增加呈上升趋势,但外径变化对立管位移响应的影响却不显著。触地点处的等效应力发生了剧烈变化,从触地点到悬挂点,立管所受等效应力呈振荡波形,峰值整体呈上升趋势,波峰之间的间距逐渐增大。立管位移响应主要受立管壁厚、内部流体密度以及海流流速的影响,而立管等效应力主要受立管内部流体密度和海流流速的影响。
Based on the structural characteristics of the Steel Catenary Riser(SCR)considering seabed contact,a linear truncation model considering pipe-soil separation are used to describe p-y curves.The displacement response and equivalent stress of the riser are analyzed by changing the riser diameter,the riser wall thickness,the pipe fluid medium and the current velocity.The horizontal displacement at the top of the riser is used to simulate the horizontal drift of the upper body.The results indicate that the vertical displacement response is a downward trend with the increase of wall thickness and internal fluid density,and with the increase of current velocity,the vertical displacement response is a rising trend.The influence of the outside diameter on the displacement response of the riser tube is not significant.The equivalent stress has changed dramatically on touch down point.From touch down point to hang off point,equivalent stress of riser is the oscillation waveform peak and the peak value is a upward trend,and the distance between wave crests increases gradually.It is concluded that the displacement response of the riser is mainly affected by the wall thickness of the riser,the internal fluid density,and the current flow velocity.The equivalent stress of the riser is mainly affected by the internal fluid density and the current flow velocity.
出处
《中国海洋平台》
2017年第5期82-88,共7页
China offshore Platform
基金
国家自然科学基金资助项目(51609206
51522902
51379033)
国家留学基金资助项目(201608515007)
关键词
钢悬链式立管
海底接触
位移响应
等效应力
Steel Catenary Riser(SCR)
seabed contact
displacement response
equivalent stress
