This article presents a simplified stress–strain relationship for the definition of the mechanical behavior of prestressing strands subjected to chloride-induced corrosion, named SCPS-model (Simplified Model for Corroded Prestressing Strands). The constitutive law adopts the equivalent spring model, that reproduces the overall behavior of a corroded strand by summing the contributions of each wire, assumed as a spring working in parallel to the others. The SCPS-model is designed for the application in the daily engineering practice; to this aim, it is based on a single input parameter that is the maximum penetration depth of the most corroded wire. Following a detailed description of the model formulation and parameters, the article shows the validation of the stress–strain relationship through several comparisons with experimental tensile test outcomes coming from scientific literature. Finally, a statistical analysis of the dimensionless ratio of experimental and analytical results in terms of ultimate corroded strength and strain is carried out to demonstrate the effectiveness of the SCPS-model. Concluding, the accurate and safe side prediction of the residual mechanical behavior of corroded prestressing strands is proposed using the SCPS-model.

A simplified stress–strain relationship for the mechanical behavior of corroded prestressing strands: The SCPS-model / Franceschini, L.; Belletti, B.; Tondolo, F.; Sanchez Montero, J.. - In: STRUCTURAL CONCRETE. - ISSN 1464-4177. - (2022). [10.1002/suco.202200170]

A simplified stress–strain relationship for the mechanical behavior of corroded prestressing strands: The SCPS-model

Franceschini L.
;
Belletti B.;
2022

Abstract

This article presents a simplified stress–strain relationship for the definition of the mechanical behavior of prestressing strands subjected to chloride-induced corrosion, named SCPS-model (Simplified Model for Corroded Prestressing Strands). The constitutive law adopts the equivalent spring model, that reproduces the overall behavior of a corroded strand by summing the contributions of each wire, assumed as a spring working in parallel to the others. The SCPS-model is designed for the application in the daily engineering practice; to this aim, it is based on a single input parameter that is the maximum penetration depth of the most corroded wire. Following a detailed description of the model formulation and parameters, the article shows the validation of the stress–strain relationship through several comparisons with experimental tensile test outcomes coming from scientific literature. Finally, a statistical analysis of the dimensionless ratio of experimental and analytical results in terms of ultimate corroded strength and strain is carried out to demonstrate the effectiveness of the SCPS-model. Concluding, the accurate and safe side prediction of the residual mechanical behavior of corroded prestressing strands is proposed using the SCPS-model.
A simplified stress–strain relationship for the mechanical behavior of corroded prestressing strands: The SCPS-model / Franceschini, L.; Belletti, B.; Tondolo, F.; Sanchez Montero, J.. - In: STRUCTURAL CONCRETE. - ISSN 1464-4177. - (2022). [10.1002/suco.202200170]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2932674
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