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Title: Modified Analytical Model for Shear Capacity of Corroded Columns

Author(s): Benjamin Matthews, Alessandro Palermo, and Allan Scott

Publication: Structural Journal

Volume: 122

Issue: 4

Appears on pages(s): 3-18

Keywords: analytical model; circular columns; corrosion; cyclic; reinforced concrete (RC); shear

DOI: 10.14359/51745466

Date: 7/1/2025

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 reinforced concrete (RC) columns considering corrosive conditions. The results of 16 shear-critical RC columns, artificially corroded to various degrees and tested under quasistatic reversed cyclic loading, are used for model verification. The final model is proposed in a piecewise 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 1380 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.


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Electronic Structural Journal



  

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