Monitoring of corrosion extent is critical in bridge operation and civil buildings. Reducing the effective cross-sectional area of components can redistribute the stress state and increase the true stress in the critical parts of civil structures. Unexpected rupture of bodies can occur as a result of their over-stressing. However, it is not possible to take relevant samples from these structures for a laboratory analysis during their lifetime. For this reason, this study investigates the potential of magnetic Barkhausen noise analysis for real-time corrosion extent monitoring. This study demonstrates that Barkhausen noise emission drops down along with an increasing degree of corrosion of steel S460MC. Progressive and remarkable decrease of Barkhausen noise and alteration of extracted features result from increasing surface roughness and superimposing influence of the increasing thickness of the near-surface layers containing mainly iron oxides. Furthermore, it was found that corrosion on the surface also alters the relation between tensile stress and Barkhausen noise within the interaction volume.
Bridges are significant elements of the transport infrastructure, so they should be in operation throughout the whole design life. Therefore, it is necessary to know the main causes of damages and failures of the bridges. The corrosion of structural steel caused by atmospheric influences as well as the bridge exploitation cause a cross-sectional reduction of structural elements and, consequently, a decrease of the resistance of steel bridge members. The article deals with corrosion and its impact on steel bridge elements in order to use this data for developing actual corrosion model appropriate for design of structures on durability.
The durability of steel constructions is strongly influenced by damage due to environmental actions, which need to be consider in design and maintenance of new and also existing structures. Corrosion aggressiveness of the atmospheric environment is classified by the corrosion rate, what it represents thickness losses of structural steel. That leads to a smaller resistant area, producing a decrease in the structural performance in terms of resistance, stiffness and ductility. The object of this contribution is to present a partial report of experimental research of corrosion processes influence on steel bridges in Slovakia and Poland.
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