由于地震、断层、滑坡和沉降等原因,张力腿平台(tension leg platform, TLP)下端的桩基可能发生错动。考虑平台本体有限位移、六自由度运动耦合、瞬时位置和瞬时湿表面、自由表面效应等非线性因素,建立TLP系统的耦合动力学方程。采用变...由于地震、断层、滑坡和沉降等原因,张力腿平台(tension leg platform, TLP)下端的桩基可能发生错动。考虑平台本体有限位移、六自由度运动耦合、瞬时位置和瞬时湿表面、自由表面效应等非线性因素,建立TLP系统的耦合动力学方程。采用变步长龙格库塔算法编写了数值计算程序,得到了波浪作用下平台本体六个自由度运动响应和系泊张力响应。通过文献对比,验证了理论模型和计算程序的正确性。基于南海流花油田一年一遇的设计工况,计算得到桩基下沉0.1 m时16个工况下平台系统的动力响应的时间历程。以正常工况为基准,对比了不同工况中平台本体六个自由度运动、系泊张力的幅值和标准差,研究结果表明:桩基下沉对平台的六自由度响应和张力腿张力幅值产生明显的影响,但不加剧运动响应和张力响应的波动;桩基下沉会破坏平台系统原有的对称性,引起垂荡位移的较大恶化;桩基下沉会引起张力腿张力大幅增大,存在张力腿断裂和系泊失效的风险。展开更多
对张力腿平台(tension leg platform,TLP)在不同系泊失效条件下的动态响应进行分析,采用全耦合数值工具ANSYS/AQWA建立非线性平台-筋腱模型,并提出一种模拟筋腱失效的方法。主要分析了筋腱失效时的瞬态响应,筋腱同时失效和渐进失效下的...对张力腿平台(tension leg platform,TLP)在不同系泊失效条件下的动态响应进行分析,采用全耦合数值工具ANSYS/AQWA建立非线性平台-筋腱模型,并提出一种模拟筋腱失效的方法。主要分析了筋腱失效时的瞬态响应,筋腱同时失效和渐进失效下的平台瞬态响应,以及筋腱失效后平台的性能变化。结果表明:首先,筋腱断裂失效会导致平台产生瞬时过冲;其次,筋腱同时失效下的瞬态响应比筋腱渐进失效的瞬态响应更显著;最后,筋腱失效后平台的性能会发生明显的变化。因此,需提前研究筋腱断裂对平台动态响应的影响,防止平台的安全性受到威胁。展开更多
Stress response of a tension leg platform （TLP） in extreme environments was investigated in this paper. A location on one of the gussets was selected as the object point, where directional stresses were numerically ...Stress response of a tension leg platform （TLP） in extreme environments was investigated in this paper. A location on one of the gussets was selected as the object point, where directional stresses were numerically simulated and also experimentally verified by a strain gage. Environmental loading and the platform＇s structural strength were analyzed in accordance with industrial standards, utilizing linear wave theory and the finite element method （FEM）. The fast Fourier transform technique was used to calculate the stress response amplitude operators （RAO） from the records of measurements. A comparison was performed between the stress RAO of the numerical simulation and that of the actual measurements. The results indicated that the stress RAO of the numerical simulation fitted well with measured data at specified wave headings with different periods.展开更多
文摘由于地震、断层、滑坡和沉降等原因,张力腿平台(tension leg platform, TLP)下端的桩基可能发生错动。考虑平台本体有限位移、六自由度运动耦合、瞬时位置和瞬时湿表面、自由表面效应等非线性因素,建立TLP系统的耦合动力学方程。采用变步长龙格库塔算法编写了数值计算程序,得到了波浪作用下平台本体六个自由度运动响应和系泊张力响应。通过文献对比,验证了理论模型和计算程序的正确性。基于南海流花油田一年一遇的设计工况,计算得到桩基下沉0.1 m时16个工况下平台系统的动力响应的时间历程。以正常工况为基准,对比了不同工况中平台本体六个自由度运动、系泊张力的幅值和标准差,研究结果表明:桩基下沉对平台的六自由度响应和张力腿张力幅值产生明显的影响,但不加剧运动响应和张力响应的波动;桩基下沉会破坏平台系统原有的对称性,引起垂荡位移的较大恶化;桩基下沉会引起张力腿张力大幅增大,存在张力腿断裂和系泊失效的风险。
文摘对张力腿平台(tension leg platform,TLP)在不同系泊失效条件下的动态响应进行分析,采用全耦合数值工具ANSYS/AQWA建立非线性平台-筋腱模型,并提出一种模拟筋腱失效的方法。主要分析了筋腱失效时的瞬态响应,筋腱同时失效和渐进失效下的平台瞬态响应,以及筋腱失效后平台的性能变化。结果表明:首先,筋腱断裂失效会导致平台产生瞬时过冲;其次,筋腱同时失效下的瞬态响应比筋腱渐进失效的瞬态响应更显著;最后,筋腱失效后平台的性能会发生明显的变化。因此,需提前研究筋腱断裂对平台动态响应的影响,防止平台的安全性受到威胁。
基金supported by the Fund of "111 Project" (Grant No.B07019) from the State Administration of Foreign Experts Affairs and the Ministry of Education of China
文摘Stress response of a tension leg platform （TLP） in extreme environments was investigated in this paper. A location on one of the gussets was selected as the object point, where directional stresses were numerically simulated and also experimentally verified by a strain gage. Environmental loading and the platform＇s structural strength were analyzed in accordance with industrial standards, utilizing linear wave theory and the finite element method （FEM）. The fast Fourier transform technique was used to calculate the stress response amplitude operators （RAO） from the records of measurements. A comparison was performed between the stress RAO of the numerical simulation and that of the actual measurements. The results indicated that the stress RAO of the numerical simulation fitted well with measured data at specified wave headings with different periods.
