腐蚀影响下半潜平台浮体时变极限强度  

Time variant ultimate strength of corroded pontoon of semi-submersible

作　　者：徐志亮[1] 王德禹[1] 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《海洋工程》2011年第4期81-86,共6页The Ocean Engineering

基　　金：国家高技术研究发展计划(863)经费资助项目(2006AA09A103-0)

摘　　要：主要探讨了半潜钻井平台浮体结构由于受到海洋环境腐蚀作用后的时变极限强度问题。首先,总结各种关于腐蚀损伤的平均厚度缩减模型,选择较能反映实际腐蚀过程的数学模型来估量浮体的钢板厚度缩减。在此基础上进行一系列极限强度计算,根据计算结果给出浮体极限强度预报公式。最后研究不同纵向构件板厚折减对极限强度的影响,发现浮体角隅板的单位体积影响率最高,而占结构比例大的构件厚度折减也将使得强度大大削弱,这两类纵向构件需要予以重点腐蚀保护。The main theme here is time variant ultimate strength of pontoon of semi-submersible drilling platform when it is under corrosion condition.Firstly,mean thickness reducing models are summarized.Proper mathematical model,which may reflect real corrosion process,is chosen to estimate steel plate thickness reduction.A series of calculations of ultimate bending resistant ability are taken,and a formula estimating the ultimate strength of the pontoon is got from these calculations.At last,the influence of different longitudinal structures on the pontoon ultimate strength due to mean thickness reduction is studied.It′s found that unit volume reduction of corner shell affects ultimate strength most,and that thickness reduction of components accounting for large proportion of the whole structure will also decrease ultimate strength substantially.For these two types of longitudinal components,adequate corrosion protection is needed.

关 键 词：半潜平台 浮体 极限强度 腐蚀模型 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]