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

Zhaoqi Wu,Yuan Wei,Shao-Fei Jiang,Xintao Wang,Chao Huang

doi:10.3390/app10061998

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%.

Highlights

As an important part of lifeline engineering, bridge structures are mostly built in corrosive environments such as rivers, lakes, and seas
Corrosion can cause the decline of material properties and the load carrying capacities of members [1,2]. It can affect the overall safety of bridge structure and lead to huge economic losses
It can be found that the ultimate load carrying capacities of specimens calculated based on section reduction are close to the test results, and have a certain safety margin, indicating the on section reduction are close to the test results, and have a certain safety margin, indicating the feasibilityof ofthis thismethod

Summary

Introduction

As an important part of lifeline engineering, bridge structures are mostly built in corrosive environments such as rivers, lakes, and seas. As the service time increases, the bridge structure will inevitably become corroded. Corrosion can cause the decline of material properties and the load carrying capacities of members [1,2]. In severe cases, it can affect the overall safety of bridge structure and lead to huge economic losses. Safety assessment and residual life prediction of corroded bridge structures have become important research topics globally. In this case, study on the mechanical properties of corroded members, as the premise and basis, is of extreme significance

Methods

Results

Conclusion