非粘结柔性立管螺旋键缠绕角度敏感性分析

Sensitivity Analysis of Spiral Bond Winding Angle of Unbonded Flexible Vertical Pipe

非粘结柔性立管结构形式复杂,层与层之间涉及摩擦、接触等非线性特性,使其数值模拟方面很难同时保证效率与精度。针对柔性立管特殊的结构形式,本文建立不同角度螺旋键的非粘结柔性立管高效分析简化模型,通过Ansys workbench软件分析非粘结柔性立管在内压和拉伸、扭转、弯曲的组合荷载工况下螺旋键缠绕角度对其刚度的影响。结果表明:本文所建立的立管简化分析模型与立管原型的力学性能吻合较好,并且可以提高计算效率;螺旋键缠绕角度越大,立管的扭转刚度越大,拉伸刚度与弯曲刚度越小;内压的施加对拉伸刚度、扭转刚度和弯曲刚度是有利的,内压对于弯曲刚度有较明显的增加,对拉伸刚度和扭转刚度有较小程度的增加。

Non-bonding flexible riser structure is complex,involving friction between layer and layer,such as contact nonlinear characteristics,the numerical simulation on it is difficult to guarantee the efficiency and accuracy at the same time,considering the special structure,flexible riser for different angles screw key deed the efficient analysis of simplified model of flexible riser,through Ansys workbench software analysis the bonding flexible riser,a combination of pressure and tension,torsion and bending load working conditions is key helical winding angle on its stiffness.The results show that the simplified analytical model of riser is in good agreement with the unsimplified model of riser and can improve the computational efficiency.The larger the winding angle,the greater the torsional stiffness of the riser,and the smaller the tensile stiffness and bending stiffness.The application of internal pressure is beneficial to the tensile stiffness,torsional stiffness and bending stiffness.The internal pressure increases significantly to the bending stiffness,but to a lesser extent to the tensile stiffness and torsional stiffness.