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Journal of Marine Science and Application[ISSN:1002-2848/CN:61-1400/f]

卷:

期数:

2020年4

页码:

674-692

栏目:

出版日期:

2020-12-25

Info

Title:

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

Author(s):

Zorareh Nouri;  Mohammad Reza Khedmati

Affilations:

Author(s):

Zorareh Nouri;  Mohammad Reza Khedmati

Department of Maritime Engineering, Amirkabir University of Technology(Tehran Polytechnic), Tehran 15916-34311, Iran

Keywords:

Uniform corrosion; Random corrosion; Pitting corrosion; Tanker pattern corrosion; Progressive collapse analysis; Vertical bending; Ultimate strength; Residual strength

分类号:

-

DOI:

10.1007/s11804-020-00173-z

Abstract:

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.

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Memo

Memo:

Received date:2020-03-22;Accepted date:2020-08-01。
Foundation item:The second author gratefully thanks his outstanding master, Professor Tetsuya Yao, for providing the HULLST code and granting the permission to use it during supervision of his PhD student (the first author). Also, he addresses his special thanks to the distinguished Professor Carlos Guedes Soares for his encouragement. Moreover, the authors thank the respected reviewers for their valuable comments.
Corresponding author:Mohammad Reza Khedmati,khedmati@aut.ac.ir

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Last Update: 2021-04-07