A simplified stress–strain relationship for the mechanical behavior of corroded prestressing strands: The <scp>SCPS</scp>‐model
Lorenzo Franceschini, Beatrice Belletti, Francesco Tondolo, Javier Sánchez-Montero
Abstract
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.