Mechanical Behavior of Circular Steel Tubular Beam-Columns Corroded Uniformly in Atmospheric Environment

Abstract

Circular steel tube members with the absence of anticorrosive protection or coating failure are prone to uniform corrosion, which threatens the reliability and safety of members in the atmospheric environment. To fully study the mechanical behavior of uniformly corroded circular steel tubes, compression test and theoretical analysis were conducted, and two methods considering section reduction and material degradation, respectively, were adopted for the calculation of ultimate load carrying capacities of specimens. The results indicate that uniform corrosion did not change the failure modes of specimens, and all of them belonged to global buckling failure. The load carrying capacities and stiffness of specimens decreased with the increase of corrosion ratio, and the degree of reduction was greater than that of material degradation, showing a linear relationship with the corrosion rate. Under the same corrosion ratio, the specimens with larger eccentricity represented more obvious load carrying capacity and stiffness degradation. The load carrying capacities predicted by both methods were in good agreement with the test results and had a certain safety margin. The conservative degree of calculation results from three specifications followed a descending order of ANSI/AISC 360-16, GB 50017-2017, and EN 1993-1-1. Under the same corrosion ratio, the load carrying capacity variation of specimens between one-sided corrosion and two-sided corrosion was less than 3%.

Comprehensive Safety Evaluation of Corroded Circular Steel Tubes under Compression Based on Image Processing

“…According to Wu et al [1], accelerated corrosion of CCSTs under both uniform corrosion and compression is achieved by manually spraying the steel tubes. Uniform corrosion assumption is adopted for CCSTs, that is, the corrosion ratio and corrosion depth of the same CCST are the same.…”

“…Taking the three members, i.e., C0-30, C35-90, and C15-180, as introduced by Wu et al [1] as examples, the overall morphology of these members before and after rust removal has been presented in Figure 9. According to the method mentioned above, the feature values of the images of each member before and after rust removal are extracted, and the safety of the steel compression members is evaluated based on Table 9.…”

“…Corrosion of the steel members is inevitable in such severe environments, particularly in the presence of high temperature, high humidity, and high chloride ion concentrations. Present studies of CCST-based members [1][2][3][4][5] reveal that corrosion directly influences the effective section and load-carrying capacity of steel members, thereby affecting the overall safety of the whole structure. Therefore, a convenient and accurate evaluation approach for detecting hidden corrosion sooner and avoiding economic losses in CCST-based structures is very important.…”

Ultimate Compressive Strength of H-Section Stub Columns Subject to Random Pitting Corrosion Damage

“…In this context, two typical columns with tubular and H-sections have been widely considered. The compressive strength of circular steel tubes with general (uniform) corrosion damage aroused more attention, and numerous experimental and numerical studies were conducted to explore the effects of location and degree of corrosion damage on strength reduction [6,7]. It was reported that the failure mode of corroded steel pipes was not affected by general corrosion, which leads to uniform thickness loss over the entire member, but by localized uniform corrosion, which causes local thickness loss in part of surface of the member.…”