基于能量守恒原理建立海缆在轴对称荷载作用下的3种力学分析理论模型,3种模型均可计入层间初始间隙,不同于螺旋层的变形考虑,模型1只考虑轴向变形,模型2在此基础上将径向变形考虑在内,模型3进一步计入局部弯曲和扭转;接着,通过具体实例验证理论模型的可靠性;最后,分析海缆的结构力学特性。研究结果表明：螺旋层的径向变形、局部弯曲和扭转对海缆轴对称力学响应影响较小,建议采用模型1进行分析;轴对称荷载作用下,螺旋层是主要的承载构件,且荷载的作用会导致层间发生分离,分离位置与荷载类型及方向有关;层间初始间隙越大,海缆刚度越小;铠装螺旋角度的增加会降低海缆抗拉刚度,增大顺/逆抗扭刚度;海缆的顺/逆扭转截面性能有所不同,其顺抗扭刚度较逆抗扭刚度大;外水压会增大海缆逆抗扭刚度,对抗拉刚度及顺抗扭刚度无影响。
Abstract
This paper establishes three theoretical models for the mechanical analysis of submarine cables under axisymmetric loads based on the principle of energy conservation. All three models take into account the initial gap between layers, which is different from the deformation consideration of the helical layer. Model 1 only considers axial deformation, Model 2 incorporates radial deformation on this basis and Model 3 further considers local bending and torsion. Then, the reliability of the theoretical model is verified through a specific example. Finally, the structural mechanical properties of the submarine cable are analyzed. The results show that the radial deformation, local bending and torsion of the helix layer have little influence on the axisymmetric mechanical response of the submarine cable, and it is recommended to use Model 1 for analysis. Under axisymmetric loads, the helical layer is the main bearing component, and the load will cause separation between the layers, with the separation position related to the type and direction of the load. The larger the initial gap, the smaller the stiffness of the submarine cable. The increase of the helix angle will reduce the tensile stiffness of the submarine cable and increase the clockwise/counterclockwise torsional stiffness. The clockwise/counterclockwise torsional sectional performance of the submarine cable is different, with the clockwise torsional stiffness being larger than the counterclockwise torsional stiffness. External water pressure will increase the counterclockwise torsional stiffness, and have no effect on the tensile stiffness and clockwise torsional stiffness.
关键词
海上风电 /
海缆 /
能量守恒 /
力学特性 /
轴对称荷载 /
截面性能
Key words
offshore wind power /
submarine cables /
energy conservation /
mechanical properties /
axisymmetric loads /
cross-sectional properties
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