Abstract: Ropes are critical components for mooring ships and offshore floating structures under periodic axial loads. To investigate the tensile properties and stiffness characteristics of deep-sea mooring polyester ropes, they are categorized into three stages: preloading, initial installation, and aging. Initially, the tensile properties of the ropes under static loads are examined, quantifying strain and reversible elongation rates at each stage and comparing mechanical properties of polyester ropes with those of nylon ropes. Subsequently, creep coefficient solution tests under varying tensions are designed, establishing a quasi-static stiffness empirical equation with consideration of the rope creep coefficients. Experiments have shown that the mooring ropes still undergo reversible elongation after unloading, and sufficient break-in period of the ropes can reduce their inherent deformation and increase their structural stability. Static stiffness of the ropes increases with loading time and force until it reaches a constant value. Polyester ropes have greater stiffness, smaller deformation and more stable structure than nylon ropes, making them more suitable for deep-sea mooring. The findings enable comprehensive analysis of rope stiffness evolution throughout its service life, thereby offering references for reasonable design of deep-sea taut-line mooring systems.

Key words: synthetic fiber rope, deep sea mooring, static stiffness, creep coefficient, cyclic load

摘要： 缆绳是船舶和海洋浮式结构物系泊的关键部件,需承受周期性变化的轴向载荷。为研究深海系泊聚酯绳的拉伸性能和刚度特性,该文将缆绳全生命周期划分为预加载、初安装、老化这3个阶段。首先研究了缆绳静态载荷作用下的拉伸特性,定量分析了各阶段缆绳的应变和可逆伸长率,并对比聚酯缆绳和尼龙缆绳的力学性能差异;其次,设计不同张力作用下的蠕变系数求解试验,建立了考虑绳索蠕变系数的准静态刚度经验方程。试验表明：静置后的缆绳仍存在可逆伸长,缆绳磨合越充分,其固有形变越小,结构越稳定;同时,缆绳的静态刚度随着加载时间增加和力的增大而增大,但最终会趋于定值。聚酯缆绳的刚度比尼龙绳大,形变量小,结构更加稳定,更适用于深海系泊。该文的研究成果有助于深入分析缆绳全周期刚度特性的演变,为深海绷紧式系泊系统的合理设计提供重要参考。

关键词: 合成纤维缆绳, 深海系泊, 静态刚度, 蠕变系数, 循环载荷