The paper focuses on the analytical formulation of the effects of localized corrosion on a post-tensioned concrete bridge in which cables are made adherent by cast-in-situ mortar injection. The corrosion is considered homogeneously distributed over a finite portion of the cable duct characterized by a lack of mortar injection. The paper proves that the reduction of the cross-section area of the prestressing cables due to corrosion generates losses in the prestressing force and a stress redistribution inside the remaining undamaged cables. These aspects are numerically quantified by considering several percentages of corroded area in a typical bridge cross-sectional geometry, providing information for damage identification purposes.

Emma Ghini, Luca Tomassetti, Matteo Marra, Stefano Silvestri (2023). Analytical study of cable corrosion effects due to lack of mortar injection in a post-tensioned concrete bridge. Lausanne : Fédération Internationale du Béton – International Federation for Structural Concrete.

Analytical study of cable corrosion effects due to lack of mortar injection in a post-tensioned concrete bridge

Emma Ghini
Primo
;
Matteo Marra;Stefano Silvestri
Ultimo
2023

Abstract

The paper focuses on the analytical formulation of the effects of localized corrosion on a post-tensioned concrete bridge in which cables are made adherent by cast-in-situ mortar injection. The corrosion is considered homogeneously distributed over a finite portion of the cable duct characterized by a lack of mortar injection. The paper proves that the reduction of the cross-section area of the prestressing cables due to corrosion generates losses in the prestressing force and a stress redistribution inside the remaining undamaged cables. These aspects are numerically quantified by considering several percentages of corroded area in a typical bridge cross-sectional geometry, providing information for damage identification purposes.
2023
3rd fib Italy YMG Symposium on Concrete and Concrete Structures “Concrete challenges in a sustainable perspective”
111
118
Emma Ghini, Luca Tomassetti, Matteo Marra, Stefano Silvestri (2023). Analytical study of cable corrosion effects due to lack of mortar injection in a post-tensioned concrete bridge. Lausanne : Fédération Internationale du Béton – International Federation for Structural Concrete.
Emma Ghini; Luca Tomassetti; Matteo Marra; Stefano Silvestri
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/962042
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