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Abstract
The study presented in this paper describes the coupled influence of corrosion and cross-sectional 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 finite 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 influence of corrosion damage and cross-sectional shape result in multiple failure mechanisms in corroded RC columns.
Highlights
In the last two decades, the concern of ageing and environmental deterioration of Reinforced Concrete (RC) infrastructure has increased significantly across the globe
It should be noted that, since the focus of this paper is to develop a damage index to account for various failure mechanisms; it is assumed that reinforcement are uniformly corroded within the cross section and over the column height
The corrosion damaged limit states are considered by proposing a dimensionless combined local damage index
Summary
In the last two decades, the concern of ageing and environmental deterioration of Reinforced Concrete (RC) infrastructure has increased significantly across the globe. The main contribution and novelty of the current study in comparison to preceding studies are: (i) constructing a dimensionless corrosion-dependent local damage index, which can be used in seismic fragility analysis of corroded RC structures, and (ii) investigation of the coupled influence of corrosion damage and cross-sectional shape on damage sequences and failure mechanisms of RC bridge piers. To this end, the dimensionless combined local damage index proposed by Mergos and Kappos (2013) is employed and modified to incorporate the influence of corrosion on damage estimation of corroded RC structures. It is found that the failure of 5% corroded circular column is governed by core concrete crushing followed by premature fracture of reinforcing bars due to fatigue failure, the failure of the corresponding rectangular column with the same corrosion damage is governed by core concrete crushing
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