摘要
在系统地分析和总结国内外有关海洋工程结构的疲劳损伤及其寿命可靠性评估方法研究的基础上 ,提出了基于随机疲劳理论的海洋平台结构疲劳可靠性分析方法 ,以此作为结构疲劳理论发展的主要方向之一 .在此方法中 ,结合海洋工程结构的特点 ,提出了疲劳应力范围分布模型的修正 ,将疲劳寿命划分为疲劳裂纹形成寿命和裂纹扩展寿命两个阶段 .采用体系可靠度理论 ,分析了结构疲劳全寿命及其可靠性 ,然后将此方法运用到中国南海某一平台结构 。
Being exposed to the environment of complex sea, the offshore engineering structures are acted by the stochastic loads caused from the wave, current and wind etc., sot the fatigue failure is one of the main failure case. The related researches about the fatigue damage and life prediction are systemically reviewed after the study of the latest approaches. A new prediction approach to structural fatigue damage and life of offshore engineering is presented on the basis of the stochastic fatigue theory. In this approach, the correction of the distribution model on the range of fatigue stress is improved. The procedure of fatigue life is divided into two ranges: the life of fatigue crack deforming, and the life of fatigue crack developing. The prediction of fatigue life and fatigue reliability for offshore structures is evaluated by the structural system reliability. Then, a satisfactory application is obtained, which is the proof of its practicability and simplicity.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2002年第2期138-142,共5页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目 (5 9895 4105 97790 0 2 )
浙江大学曹光彪高科技基金资助项目
