软刚臂上铰节点疲劳失效分析和现场监测方案设计

Fatigue failure analysis and proto-type monitoring scheme design of upper hinge joint of soft YOKE mooring system

海洋环境荷载非平稳性、时变性等特点为海洋工程结构设计带来挑战。海洋工程结构设计的不准确性可导致其真实服役时间低于自身设计寿命。针对塔架软刚臂系泊系统上铰节点服役过程中出现的疲劳磨损问题,发展出一种基于原型监测技术的铰节点疲劳寿命实时预估方法。通过开展有限元模拟,建立系泊腿在指定摆动角度下摩擦系数和热点区域应力分布的对应关系,提出了软刚臂上铰节点的原型监测方案。结合不同摩擦系数对铰节点接触面损伤行为的影响,提出了软刚臂主铰结构疲劳寿命计算评估方法,能够实现铰节点疲劳的完整性分析。

Non-stationary and time variant characteristics of ocean environmental loads brings great challenges to the design of marine engineering structures. The inaccuracy of marine structural design can make the actual in-service life of marine structures shorter than their design index. In this paper, a real-time fatigue evaluation method on the basis of prototype monitoring technique is developed for the fatigue wear problem of upper hinge joints of tower soft yoke mooring system. The relationship between stress distribution of hot spot region of mooring leg and friction coefficient with different swing angles is obtained via finite element simulations. The prototype monitoring scheme of upper hinge joint is developed. The fatigue evaluation method of upper hinge joint of soft yoke system is proposed by considering the influence of different friction coefficients on the damage behavior of the interface of the hinge joint. It can be used to analyze the integrity of hinge joints.