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为实现对波流共同作用下的隔水管疲劳可靠性分析,在时域里对隔水管进行随机非线性响应计算,给出空间隔水管非线性涡激动力响应的增量迭代算法.通过计算得到的隔水管关键点的应力时间历程和应用累积损伤模型,估算隔水管的疲劳寿命并进行可靠性分析,得出不同顶部预张力、旋转刚度和相关应力成分对疲劳可靠性影响的分析结果.
In order to realize the reliability analysis of riser fatigue under the combined action of wave and wave, the random nonlinear response of riser is calculated in the time domain, and an incremental iterative algorithm for nonlinear vortex-induced dynamic response of riser is given. The stress duration of the key points of riser and the cumulative damage model are used to estimate the fatigue life of the riser and the reliability analysis. The results of the analysis of the influence of different top pre-tension, rotation stiffness and related stress components on the fatigue reliability are obtained.