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.