Abstract
Atmospheric corrosion can seriously affect the performance of steel structures over long periods of time; thus, it is essential to evaluate the rate of corrosion and subsequent modification of dynamic properties of a structure over different time periods. Standards and codes represent the general guidelines and suggest general protection techniques to prevent structures from corrosion damage. The available models in the literature propose the thickness reduction method that accounts for the exposure time of structures in corrosive environments. The purpose of this study is to review the existing corrosion models in the literature and report as well as compare their effectiveness in low (C2 level), medium (C3 level) and high (C4 level) corrosivity class in accordance with the ISO standard. Furthermore, the influence of corrosion loss during the lifetime of a structure is studied through a realistic case study model using FEM (finite element method) in both linear and nonlinear regions. The results showed that the corrosion can considerably affect the dynamic characteristics of the structure. For instance, the vibration period rose up to 15% for the C4 class and 100-year lifespan. Additionally, the corroded structure presented higher acceleration and drift demand, and the base reaction forces were reduced up to 60% for the same class and time period.
Highlights
Structural steel tends to corrode naturally due to exposure to moisture and oxygen and the annual cost due to corrosion of steel structures, especially at coastal sites, can be tremendous
It is assumed that the reference period of the process unit under consideration is roughly 63 years; the vibration rises by 3%, 5% and 10% in the case of corrosion effect on web, flange and the entire section, respectively, regarding the C4 corrosivity level
New methods were proposed considering the effect of corrosion damage on the mechanical properties of the structure
Summary
Structural steel tends to corrode naturally due to exposure to moisture and oxygen and the annual cost due to corrosion of steel structures, especially at coastal sites, can be tremendous. The effect of corrosion is defined by the average depth loss; D, relative to the initial thickness and mass loss ratio as follows: D= m0 − m m0 ∗ t0 (1). Corrosion mass loss can reduce the overall structural performance by changing the inherent structural characteristics of the system. The results showed that the frequency was reduced for all modes of vibration and structures, considering maximum corrosion depth, D, equal to 1.4 mm. It is worth noticing that the first transversal mode of a truss roof was reduced by 17% which corresponded to the maximum D and 20 years of exposure
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
