Abstract
Corrosion is considered as one of the main factors in the structural performance deterioration of steel members. In this study, experimental and numerical methods were used to assess the reduction in compressive strength of short tubular steel columns with artificially fabricated local corrosion damage. The corrosion damage was varied with different depths, heights, circumferences, and locations along the column. A parametric numerical study was performed to establish a correlation between the residual compressive strength and the severity of corrosion damage. The results showed that as the corrosion depth, height and circumference increased, the compressive strength decreased linearly. As for the corrosion height, the residual compressive strength became constant after decreasing linearly when the corrosion height was greater than the half-wavelength of buckling of the short columns. An equation is presented to evaluate the residual compressive strength of short columns with local corrosion wherein the volume of the corrosion damage was used as a reduction factor in calculating the compressive strength. The percentage error using the presented equation was found to be within 11.4%.
Highlights
Corrosion is one of the main contributors in the decrease of the structural performance of steel structures and develops in various outdoor conditions, such as rural, urban, and marine environments.Due to the low drag resistance and ease of handling during construction of tubular members, it is generally used in offshore structures as structural elements [1,2,3]
When the short tubular columns are subjected to axial compression, the columns experienced local buckling that resembled an elephant-foot in the corroded areas
The half-wavelength of buckling was used to analyze the behavior of the short columns
Summary
Corrosion is one of the main contributors in the decrease of the structural performance of steel structures and develops in various outdoor conditions, such as rural, urban, and marine environments. Hebor et al [1] and Nazari et al [2] used a numerical approach to evaluate the residual compressive strength of locally corroded steel tubular members in offshore structures by considering the depth and circumference of the corrosion. They suggested equations to predict the residual strength of tubes with patch corrosion. Ahn et al [8] studied the effect of a marine environment on steel members and conducted an experimental analysis on circular tubular columns with inclined corrosion damage They recommended an equation to evaluate the residual compressive strength of a tubular member with local corrosion. A simple calculation approach was presented to evaluate the residual compressive strength by using the volume of the corrosion damage as a reduction factor
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