海洋结构管节点疲劳失效的模糊定义及可靠性分析

根据模糊集合理论的基本原理，在海洋结构管节点的疲劳可靠性分析中引入疲劳失效的模糊定义，并考虑了模糊不确定性的影响，文中采用管节点疲劳可靠性分析的对数正态格式，并根据模糊集合理论中关于模糊事件概率的定义，对疲劳失效概率进行了计算。

Fuzzy Definition of Fatigue Failure and Reliability Assessment for Tubular Joints of Offshore Structures

In safety assessment of engineering structures, vague type uncertainties exist in defining certain structural performances, conditions, parameters and their inter-relationships. In this paper, based on the theory of fuzzy sets, a fuzzy definition of fatigue failure is introduced into fatigue reliability assessment for tubular joints of off shore structures to take into account the vague type uncertainties. Based on the fuzzy failure definition, together with the lognormal format for fatigue reliability assessment of tubular joints, the probability of fatigue failure is estimated. The principles described in this paped also apply to fatigue reliability assessment of other structures or structural reliability assessment related to failure states biber than fatigue failure.