Abstract
Atmospheric corrosion is a relevant problem for steel structures and components exposed in aggressive environment in case of poor and/or unfeasible maintenance and inspection during service life. As for thin-walled members, the corrosion hazard can be exacerbated due to the thin thickness of components and the coupled effect between corrosion and buckling can significantly reduce the structural capacity of such structures. Following these considerations, this paper presents a study on the reliability of a thin-walled steel section subjected to the damage induced by atmospheric corrosion in outdoor environments, combining predictive corrosion models for metals with structural reliability applications. A general procedure for the evaluation of the time variant capacity is proposed and discussed in detail. Finally, an application to a C-lipped cold formed section is presented and a reliability analysis of the deteriorating section is carried out to evaluate the coupled effect of corrosion and buckling, according to the proposed procedure.
Highlights
The durability of thin-walled steel members exposed to aggressive environments is a relevant problem for a great number of structures
This paper presents a study on the reliability of coldformed steel (CFS) sections subjected to the damage induced by atmospheric corrosion in outdoor environments, combining predictive corrosion models for metals with structural reliability applications
The present study focuses on CFS, and it is mainly based on structural component analysis, it would provide a general framework for the evaluation of durability performances of metal structures against atmospheric corrosion, such as bridges and ship structures
Summary
The durability of thin-walled steel members exposed to aggressive environments is a relevant problem for a great number of structures. The present study focuses on CFS, and it is mainly based on structural component analysis, it would provide a general framework for the evaluation of durability performances of metal structures against atmospheric corrosion, such as bridges and ship structures In such a case, other important factors, relevant to the evolution of corrosion damage as a consequence of stress state and cyclic loads, together with the development of systembased safety measures (Frangopol 2011), shall be carefully taken into account. For each time point t* of the life cycle, the structural analysis is repeated, and a sub-set of the basic variables, to be modelled as random, is identified Those can be material properties, geometries, deterioration rates, damage pattern, action effect, etc.
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