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| Dynamic response and fatigue damage analysis of a steel catenary riser at the touchdown point considering seabed contact |
| Received:September 28, 2016 Revised:December 13, 2016 |
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| DOI：10.7511/jslx201706005 |
| KeyWord:steel catenary riser seabed contact touchdown point dynamic response fatigue damage |
| Author | Institution |
| 高云 |
西南石油大学 油气藏地质及开发工程国家重点实验室, 成都 ;东京大学 机械工程学院, 东京 113-8656 |
| 王小梅 |
西南石油大学 油气藏地质及开发工程国家重点实验室, 成都 |
| 熊友明 |
西南石油大学 油气藏地质及开发工程国家重点实验室, 成都 |
| 邹丽 |
大连理工大学 船舶工程学院, 大连 |
| 宗智 |
大连理工大学 船舶工程学院, 大连 |
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| Abstract: |
| Based on the structural characteristics of touchdown points of steel catenary risers,a linear truncation model considering pipe-soil separation and a cap model containing soil suction effect are used to describe P-y curves.The dynamic response and fatigue damage characteristics at the touch down point of the riser were analyzed by changing the floating body heaving motion amplitude,the soil suction factor and the seabed stiffness.The results indicated that the vertical displacement,bending moment,equivalent stress and the fatigue damage at the touchdown point increased with the increase of floating body heaving motion amplitude.With the increase of the soil suction factor,the vertical displacement response of the steel catenary riser at touchdown points changed from the high-amplitude low-frequency response to low-amplitude high-frequency response.With the increase of the seabed stiffness,the fatigue damage of the steel catenary riser at touchdown points showed stable characteristics at first and then increased and finally became stable again. |
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