Title:
Modified Analytical Model for the Shear Capacity of Corroded Columns (Prepublished)
Author(s):
Benjamin Matthews, Alessandro Palermo, Allan Scott
Publication:
Structural Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
analytical model; circular columns; corrosion; cyclic; reinforced concrete; shear
DOI:
10.14359/51745466
Date:
12/17/2024
Abstract:
This paper proposes a series of empirical modifications to an existing three-step analytical model used to derive the cyclic shear capacity of circular RC columns considering corrosive conditions. The results of sixteen shear-critical RC columns, artificially corroded to various degrees and tested under quasi-static reversed cyclic loading, are used for model verification. The final model is proposed in a stepwise damage-state format relative to the measured damage of the steel reinforcement. New empirical decay coefficients are derived to determine the degraded material properties based on an extensive database of over 1,380 corroded tensile tests. An additional database of 44 corroded RC circular piers is collected to assist in the modification of ductility-based parameters. Compared to the shear-critical test specimens, the model results indicate that the peak shear capacity can be predicted well across a range of deterioration severities (0 to 58.5% average transverse mass loss), with a mean predictive ratio of ± 8.60 %. As damage increases, the distribution of the corrosion relative to the location of the shear plane becomes a critical performance consideration, increasing predictive variance.