上海交通大学学报

上海交通大学学报（自然版） ›› 2013, Vol. 47 ›› Issue (06): 950-955.

• 交通运输 • 上一篇    下一篇

基于随机结构的延寿服役海洋平台管节点疲劳寿命可靠度预测方法

刘勇，陈炉云，易宏   

  1. (上海交通大学 船舶海洋与建筑工程学院，上海 200240)
     
  • 收稿日期:2012-10-10

Fatigue Reliability Prediction Method for Life Extension Offshore Platform Tubular Joint Based on Stochastic Structures

LIU Yong,CHEN Luyun,YI Hong
  

  1. (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2012-10-10

摘要：

将延寿服役平台管节点在进行疲劳寿命可靠度预测的过程中视为随机结构，基于断裂力学疲劳模型，结合随机有限元法和复合随机振动理论，提出海洋平台管节点随机结构在随机波浪作用下疲劳寿命预测方法.通过算例说明了该方法的实用性和简便性，同时计算结果证明结构随机性会对疲劳寿命可靠度预测产生较大的影响.
 
 

关键词: 延寿服役平台, 管节点, 疲劳寿命可靠度, 随机结构, 复合随机振动响应谱, 虚拟激励法

Abstract:

Life extension platform structure has degenerated after suffering prolonged environmental erosion. It is difficult to observe platforms completely due to the limitation of objective conditions, so it is necessary to regard the life extension platform as a stochastic structure in tubular joint fatigue reliability prediction. Taking into consideration the fracture mechanics model, stochastic finite element method and compound random vibration theory, the fatigue life prediction method  for offshore platform tubular joint stochastic structure under stochastic wave load was proposed. The practicality and simplicity of the proposed method was proven by an example. The computational results proved that structural randomness had an effect on tubular joint fatigue life prediction.

Key words: life extension platforms, tubular joint, fatigue reliability, stochastic structure, compound random vibration response spectrum, pseudo excitation method

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