Ultimate compressive strength of plate elements with pit corrosion wastage

Abstract

The aim of the present paper is to investigate the ultimate strength characteristics of plate elements with pit corrosion wastage under axial compressive loads. Collapse tests on a box column type of steel-plated structures with diOEerent degrees of pit corrosion damage are undertaken. A series of ANSYS non-linear nite element analyses for steel plate elements under axial compressive loads are carried out, varying the degree of pit corrosion intensity and plate geometric properties. In this paper, a new parameter, i.e. the smallest cross-sectional area, is proposed to represent the ultimate strength reduction characteristics due to localized corrosion. It is proved that the proposed parameterbased approach is more useful than the traditional approach based on equivalent thickness in terms of the accuracy of ultimate strength predictions of pitted plates. Closed-form design formulae for the ultimate compressive strength of pitted plates, which are needed for the ultimate limit state-based risk or reliability assessment of corroded structures, are derived by regression analysis of the experimental and numerical results obtained from the present study. The insights developed will be very useful for the damage-tolerant design of plated structures with pit corrosion damage.

Ultimate shear strength of plate elements with pit corrosion wastage

“…It was observed that the ultimate strength of a pitted plate under edge shear is governed by the DOP. In contrast, it has been realized that the ultimate strength of a plate element under axial compressive loads is governed by the smallest cross-sectional area, i.e., the most corroded section of the plate [8].…”

“…Most recently, the authors [8] studied the ultimate strength characteristics of pitted plate elements under axial compressive loads and derived closed-form formulae for predicting the ultimate compressive strength of pitted plates.…”

A combined FEM and three-dimensional asymptotic solution based analysis on stress concentration/intensity around elliptical/circular cylinder shaped surface flaws in stretched plates

“…Especially, corrosion wastage, in conjunction with mechanical damage, is known to significantly contribute to age-related structural degradation of ship hulls [1]. Pitting corrosion, which is a localized form of corrosion, is known to be one of its most insidious form in terms of causing structural degradation and ultimately failure [2], and has attracted the attention of a number of researchers in recent years [3][4][5].…”

Effect of pitting corrosion on local strength of hold frames of bulk carriers (2nd Report)—Lateral-distortional buckling and local face buckling

“…[6][7][8][9][10][11][12][13] among others. Mateus and Witz [6] investigated the effect of general corrosion on the post-buckling of plates using the uniform thickness reduction approach and a quasi-random thickness surface model.…”

“…Paik et al [8,9] studied the ultimate strength characteristics of pitted plate elements under axial compressive loads and in-plane shear loads, and derived closedform formulae for predicting the ultimate strength of pitted plates using the strength reduction (knock-down) factor approach. They dealt with the case where the shape of corrosion pits is a cylinder.…”