Progressive Collapse Analysis of an FPSO Vessel Hull Girder Under Vertical Bending Considering Different Corrosion Models  

考虑不同腐蚀模型的受垂向弯矩作用的FPSO船体梁渐进失效分析

作　　者：Zorareh Nouri Mohammad Reza Khedmati 

机构地区：[1]Department of Maritime Engineering,Amirkabir University of Technology(Tehran Polytechnic),Tehran 15916-34311,Iran

出　　处：《Journal of Marine Science and Application》2020年第4期674-692,共19页船舶与海洋工程学报（英文版）

摘　　要：Nowadays,with the increasing operational life of ships,the aging effects on their structural behavior need to be investigated precisely.With the corrosive marine environment taken into consideration,one of the important effects of aging that must be studied is thickness degradation.In this paper,with the use of previously proposed equivalent thickness formulations for corroded plates,the progressive collapse analysis software HULLST is enhanced,and then,the effects of different corrosion models of uniform,random,pitting,and tanker pattern types on the ultimate and residual strengths of a floating production,storage,and offloading vessel hull girder are evaluated for the ages of 0 to 25 years.Results reveal that the uniform corrosion and random corrosion models have close outcomes.The value of relative reduction in the ultimate strength of ship hull girder(compared with the intact condition)ranges roughly from 6%for the age of 5 years to 17%for the age of 25 years in the hogging mode.The relative reduction in the ultimate strength ranges from 4%to 16%in the sagging mode.Pitting corrosion and tanker pattern(random)corrosion models lead to higher relative reductions in ultimate strength.The pitting corrosion model leads to a 16%–32%relative reduction in the ultimate strength for the ages of 5–25 years of the ship in either hogging or sagging.The tanker pattern(random)corrosion model leads to a 6%–37%relative reduction in the ultimate strength in the hogging mode and 3%–31%in the sagging mode at ship ages of 5 to 25 years.

关 键 词：Uniform corrosion Random corrosion Pitting corrosion Tanker pattern corrosion Progressive collapse analysis Vertical bending Ultimate strength Residual strength 

分 类 号：U674.38[交通运输工程—船舶及航道工程] U661.4[交通运输工程—船舶与海洋工程]