浅海重力式平台的冰振疲劳寿命估算  

Fatigue life estimation of ice vibration for offshore gravity platform

作　　者：杨英杰[1] 王银邦[1] 刘楠[1] 王欣[1] 李文娟[1] 

机构地区：[1]中国海洋大学工程学院土木工程系,山东青岛266100

出　　处：《哈尔滨商业大学学报（自然科学版）》2013年第2期228-232,共5页Journal of Harbin University of Commerce：Natural Sciences Edition

摘　　要：基于S-N曲线和Miner损伤累计理论对在冰载荷作用下的浅海重力式平台进行动力分析,得到热点的应力时程曲线,分析了不同的冰疲劳工况对平台的损伤影响,并绘制了图形进行了对比,表明了在考虑冰厚概率分布的情况下平台的疲劳累计损伤随着冰厚的增加先增大后降低,对平台的寿命进行了粗略的估算,结果满足平台的寿命设计要求,又对平台的强度进行了校核,结果满足钢结构设计规范的强度要求,同时绘制了平台的响应随时间变化的曲线,模拟的结果和实际情况相吻合.对进一步在复杂的环境中评估平台的安全性和耐久性提供一种参考,也为对平台的优化设计提供一定的帮助.This paper studied on the dynamic analysis of the offshore gravity platform under ice load based on the foundation of S - N curve and Miner damage cumulative theory. This paper got the stress - time - histories curve of hotspot, analyzed the effect of different ice fa- tigue working- condition on the platform and made the comparison by drawing the graphics. It showed that fatigue damage of the platform first increased, then decreased with the ice thickness increasing under the consideration of the probability distribution of ice thickness. Estimated the life of the platform rough, the results met requirements of platform life design. In addition, the results met the intensity requirements of steel structure design codes by checking the intensity of the platform. At the same time, the result was in accordance with the reality by drawing the curves of the platform response changing with time and the simula- tion. This paper provided a reference for the further evaluating the safety and durability of the platform in a complex environment, and also supplied some help for the optimization de- sign of the platform.

关 键 词：重力式平台 动力分析 疲劳分析 寿命估算 

分 类 号：P75[天文地球—海洋科学]