基于S-N曲线的深水半潜平台疲劳寿命分析  

Fatigue Analysis of Deepwater Semi-submersible Platform Based on S-N Approach

作　　者：李增华[1] 李良碧[2,1] 陈明璐[1] 嵇春艳[1] 张健[1] 

机构地区：[1]江苏科技大学,江苏镇江212003 [2]江苏现代造船技术有限公司,江苏镇江212003

出　　处：《海洋技术》2012年第1期77-82,共6页Ocean Technology

基　　金：国家自然科学基金资助项目(51079065;51109100);江苏省自然科学基金资助项目(BK2011508);江苏科技大学博士科研启动基金资助项目(35011003)

摘　　要：深水半潜平台工作环境恶劣,造价成本高,为保证安全工作,有必要对其进行疲劳寿命分析。首先利用SESAM软件建立目标平台整体模型并分析总体结构响应。然后根据平台总体结构响应计算结果,选取立柱与横撑连接处、立柱外板与上甲板连接处两个关键节点,建立关键节点有限元模型,计算其热点应力。最后采用S-N曲线分析该平台在中国南海环境条件下的疲劳寿命。分析结果显示该平台疲劳寿命符合规范要求,但立柱与横撑连接处的疲劳寿命偏低,应加强日常检修和维护。Deepwater semi-submersible platform works in bad environment conditions with high cost, so it is necessary to do fatigue analysis to make sure it works safely. Firstly, the model of platform was made and the response of the global structure was calculated based on SESAM. According to overall response result, column and brace connection ＆ column and upper deck connection were chosen as key joint. The fine FEA model of key joint was made and the hotspot stress was calculated. Finally, the fatigue life of platform was calculated based on S-N approach in South China Sea. The result shows that the platform could meet ABS rules demand but there is a low fatigue life at the column and the brace connection of the platform, so the strengthening daily repair and maintenance is necessary.

关 键 词：S-N曲线 深水半潜平台 疲劳寿命 有限元 

分 类 号：P75[天文地球—海洋科学]