Ultimate Bearing Capacity of Ship Structure Based on Random Corrosion

doi:10.11902/1005.4537.2021.144

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 662-668 DOI: 10.11902/1005.4537.2021.144

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Ultimate Bearing Capacity of Ship Structure Based on Random Corrosion

MEI Jiaxue¹, DU Zunfeng¹(

), ZHU Haitao¹^,²

^1.School of Civil Engineering and Architecture, Tianjin University, Tianjin 300072, China
^2.Tianjin Binhai Civil Engineering Structure and Safety Key Laboratory of Ministry of Education Tianjin University, Tianjing 300372, China

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Abstract

This paper puts forward a mathematical model for corrosion of steel made sea-going ships that takes the effect of marine environment temperature, seawater oxygen content and relative humidity into account. The effect of random corrosion on the local bearing capacity of stiffened plate structure of the ship and the longitudinal ultimate bearing capacity of ship hull girder is analyzed by finite element analysis. The distribution of ultimate bearing capacity of ship structure after being subjected from random corrosion is summarized. Compared with the nominal marine environment, the temperature, relative humidity and seawater oxygen content in marine environment have a significant impact on the ultimate bearing capacity of the ship structure. However, the ultimate bearing capacity of the stiffened plates and hull girder obeys a normal distribution after service for the same period of years.

Key words: random corrosion corrosion rate model ship structure ultimate bearing capacity marine environment

Received: 25 June 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51478311);National Natural Science Foundation of China(51109158)

Corresponding Authors: DU Zunfeng E-mail: dzf@tju.edu.cn

About author: DU Zunfeng, E-mail: dzf@tju.edu.cn

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Cite this article:

MEI Jiaxue, DU Zunfeng, ZHU Haitao. Ultimate Bearing Capacity of Ship Structure Based on Random Corrosion. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 662-668.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.144 OR https://www.jcscp.org/EN/Y2022/V42/I4/662

Fig.1 Comparison of corrosion thickness routes of deck (a), bottom plate (b), side plate (c), deck stiffeners (d), bottom stiffeners(e) and side plate stiffeners (f)

Fig.2 Calculation model of stiffened plate

Fig.3 Schematic diagram of stiffened plate thickness randomly generated

Table 1 Calculation results of ultimate bearing capacity of stiffened plates (MPa)

Fig.4 Comparison of ultimate bearing capacity routes of stiffened plates

Fig.5 Probability diagram of ultimate bearing capacity of stiffened plate

Fig.6 Finite element calculation model of container hull girder

Table 2 Comparison of ultimate bearing capacity results of container hull girder

Fig.7 Thickness of the randomly generated hull girder

Table 3 Calculation results of ultimate bearing capacity of hull girder hogging (10¹² N·mm)

Fig.8 Probability diagram of ultimate bearing capacity of container hull girder hogging (a) and sagging (b)

Table 4 Calculation results of ultimate bearing capacity of hull girder sagging (10¹² N·mm)

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