Ultimate Capacity Assessment of Web Plate Beams With Pitting Corrosion Subjected to Patch Loading by Artificial Neural Networks

Abstract

ABSTRACT:Corrosion is an unavoidable phenomenon in ship hull structures and thickness loss of the structural members due to corrosion is a great concern when the integrity of hull structures is considered. It is well known that pitting corrosion occurring on coated hold frames will surely result in a significant degradation of the ultimate strength of these members. Extensive study on the effect of pitting corrosion on structural strength under a wide variety of loading conditions is necessary to assess the relationship between pitting corrosion intensity and residual strength precisely. The aim of the present study is to investigate the ultimate strength characteristics of steel beams with pit and uniform corrosions wastage. Then pitted member will predict with a member that its thickness decreases uniformly in terms of ultimate strength. A series of ABAQUS nonlinear elastic-plastic analyses by Finite Element Method (FEM) has been carried out on I-shape section steel models, varying the degree of pit corrosion intensity. Load-carrying capacity of deteriorated steel beam models with different pit corrosion under patch loading has been estimated using Artificial Neural Network (ANN) method using FE results. The ultimate strength reduction factor due to web pitting corrosion of steel beams is empirically derived by ANNs of the computed results as a function of DOP. Hence, the results of this study can be used for better prediction of the failure of deteriorated steel beams by practice engineers.

Flexural Strength Prediction of Welded Flange Plate Connections Based on Slenderness Ratios of Beam Elements Using ANN

“…is procedure was also adopted by other researchers [40][41][42] where, due to limitations of the problem under study, the size of sample space was remarkably less than the minimum sample size proposed in [39]. Figure 12: Early stop technique to overcome over tting problem [38].…”

Ultimate compressive strength of deteriorated steel web plate with pitting and uniform corrosion wastage

“…Although the nite element method can in principle be used to predict buckling and post-buckling strength, it still requires substantial computational time and cost. This means that empirical formulae are still necessary to assess structural integrity during initial design, inspection, and maintenance for e ective on-site decisions [15][16][17][18].…”

Safety Analysis of Steel Box Girder Bridges With Pitting Corrosion

“…The efficient maintenance, repair and rehabilitation of existing bridges require the development of a methodology that allows for the accurate evaluation of load-carrying capacity and the prediction of remaining life. Corrosion is one of the most important causes of deterioration in steel bridges (Cheung and Li [1]; Czarnecki and Nowak [2]; Melchers [3]; Melchers and Jeffrey [4]; Sharifi [5]; Sharifi and Paik [6][7][8]; Sharifi and Tohidi [9,10]; Tohidi and Sharifi [11][12][13][14]). …”