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Experimental and numerical study of localized pitting effect on compressive Behavior of Tubular Members

Experimental and numerical study of localized pitting effect on compressive Behavior of Tubular Members
Experimental and numerical study of localized pitting effect on compressive Behavior of Tubular Members

Locally pitted tubular members are usually considered as stub columns to assess the ultimate strength. However, it is not suitable for those with relatively larger slenderness ratios as their failure behavior is more complex and closely related to corrosion features of localized pitting. This paper presents compressive column tests on locally pitted tubular members of a moderate slenderness ratio. Corrosion pits were artificially introduced on local surface of the members, forming corrosion patches with various corrosion features. A numerical modelling method was proposed to reproduce the test specimens. Localized pitting damage was proven to cause substantial declines in the load deformation capacity and ultimate strength, and have a significant effect on the failure mode. The failure of a pitted member is mostly initiated by local buckling after yielding occurs in the corrosion patch, concurrent with pitting closure, and even shear cracking of member wall due to the perforated pits. Moreover, shape change of the corrosion patch most likely results in the failure mode to alter from column buckling to local buckling or interactive buckling. The shape ratio of the corrosion patch is one of the critical factor to influence the ultimate strength of locally pitted members. The proposed modelling method is applicable for extensive stochastic simulations so as to develop an empirical formula and to clarify the probabilistic characteristics of ultimate strength.

compressive column test, failure mode, localized pitting damage, random pitting modelling, tubular member, ultimate strength
0951-8339
Wang, Renhua
377e278c-881f-4ede-be05-d0b9ac334c94
Guo, Haichao
4b421c57-b6a8-40ae-97de-85e8bde48b20
Shenoi, Ramanand
a37b4e0a-06f1-425f-966d-71e6fa299960
Wang, Renhua
377e278c-881f-4ede-be05-d0b9ac334c94
Guo, Haichao
4b421c57-b6a8-40ae-97de-85e8bde48b20
Shenoi, Ramanand
a37b4e0a-06f1-425f-966d-71e6fa299960

Wang, Renhua, Guo, Haichao and Shenoi, Ramanand (2020) Experimental and numerical study of localized pitting effect on compressive Behavior of Tubular Members. Marine Structures, 72, [102784]. (doi:10.1016/j.marstruc.2020.102784).

Record type: Article

Abstract

Locally pitted tubular members are usually considered as stub columns to assess the ultimate strength. However, it is not suitable for those with relatively larger slenderness ratios as their failure behavior is more complex and closely related to corrosion features of localized pitting. This paper presents compressive column tests on locally pitted tubular members of a moderate slenderness ratio. Corrosion pits were artificially introduced on local surface of the members, forming corrosion patches with various corrosion features. A numerical modelling method was proposed to reproduce the test specimens. Localized pitting damage was proven to cause substantial declines in the load deformation capacity and ultimate strength, and have a significant effect on the failure mode. The failure of a pitted member is mostly initiated by local buckling after yielding occurs in the corrosion patch, concurrent with pitting closure, and even shear cracking of member wall due to the perforated pits. Moreover, shape change of the corrosion patch most likely results in the failure mode to alter from column buckling to local buckling or interactive buckling. The shape ratio of the corrosion patch is one of the critical factor to influence the ultimate strength of locally pitted members. The proposed modelling method is applicable for extensive stochastic simulations so as to develop an empirical formula and to clarify the probabilistic characteristics of ultimate strength.

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Accepted/In Press date: 24 April 2020
e-pub ahead of print date: 6 May 2020
Published date: July 2020
Additional Information: Funding Information: The first author would like to thank the National Natural Science Foundation of China [grant number 51879124 ] for the financial support, and appreciate Mr. Chaoming Shen from the Engineering Mechanics Laboratory at the Jiangsu University of Science and Technology for his assistance during the experimental study. Publisher Copyright: © 2020 Elsevier Ltd
Keywords: compressive column test, failure mode, localized pitting damage, random pitting modelling, tubular member, ultimate strength

Identifiers

Local EPrints ID: 445540
URI: http://eprints.soton.ac.uk/id/eprint/445540
ISSN: 0951-8339
PURE UUID: 571432a8-69ed-455e-b845-9493642a045f

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Date deposited: 15 Dec 2020 17:30
Last modified: 17 Mar 2024 06:09

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Contributors

Author: Renhua Wang
Author: Haichao Guo
Author: Ramanand Shenoi

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