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Abstract
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The study presented in this paper describes the coupled infuence of corrosion and crosssectional shape on failure mechanism of reinforced concrete (RC) bridge piers subject to
static and dynamic earthquake loading. To this end, two RC columns varied in cross-sectional shape and corrosion degree are considered. An advanced nonlinear fnite element
model, which accounts for the impact of corrosion on inelastic buckling and low-cycle
fatigue degradation of reinforcing bars is employed. The proposed numerical models are
then subjected to a series of monotonic pushover and incremental dynamic analyses. Using
the analyses results, the failure mechanisms of the columns are compared at both material
and component levels. Furthermore, using an existing model in the literature for uncorroded columns, a dimensionless corrosion dependent local damage index is developed to
assess the seismic performance of the examined corroded RC columns. The proposed new
damage index is validated against the nonlinear analyses results. It is concluded that the
combined infuence of corrosion damage and cross-sectional shape result in multiple failure mechanisms in corroded RC columns.
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