Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Investigation of Dynamic Analysis of Corrosion Effect under to Chloride Induced in Reinforced Concrete Bridge Columns

Version 1 : Received: 23 October 2022 / Approved: 28 October 2022 / Online: 28 October 2022 (03:48:18 CEST)

How to cite: Tangtakabi, A.; Ramesht, M.H.; Golsoorat Pahlaviani, A.; Pourostam, T. Investigation of Dynamic Analysis of Corrosion Effect under to Chloride Induced in Reinforced Concrete Bridge Columns. Preprints 2022, 2022100438. https://doi.org/10.20944/preprints202210.0438.v1 Tangtakabi, A.; Ramesht, M.H.; Golsoorat Pahlaviani, A.; Pourostam, T. Investigation of Dynamic Analysis of Corrosion Effect under to Chloride Induced in Reinforced Concrete Bridge Columns. Preprints 2022, 2022100438. https://doi.org/10.20944/preprints202210.0438.v1

Abstract

One of the influential factors in estimating the service life of reinforced concrete bridges (RCB) is determining the long-term seismic performance of these structures. Corrosion due to chloride ion diffusion leads to the destruction of critical members of the RCB during the useful life of the structure. So, the long-term seismic performance of the bridge deteriorates as a result. It is essential to study the effect of corrosion deterioration on the long-term seismic performance of bridges in the southern regions of Iran, near the coasts of the Persian Gulf and the Oman Sea, because of the seismicity of the region and high corrosion rate of reinforced concrete (RC) members is the result of environmental conditions. In order to investigate this issue, considering studies about environmental conditions of southern Iran, the onset time of corrosion in the columns, as seismic critical members of the bridge, was determined. Based on that, the corrosion's effect on characteristics of RC at specific time points during the bridge's useful life (0, 15, 30, 45, 60, 75 and 90 years) have been calculated. The effects of corrosion include deterioration of the core and cover concrete properties, steel bar and the connection between concrete and steel bar. In the next step, at each time point, according to the modified stress-strain relationships, the moment-curvature analysis of the bridge pier was done, and the properties of the plastic hinge were determined. Finally, based on the obtained data about plastic hinge characteristics at each time point, overload analysis of the bridge was performed in both longitudinal and transverse directions. Then the capacity curves of RCB were compared at the mentioned time-points. The results show that the capacity of the bridge deteriorates over time due to corrosion. Therefore, a proposal to increase the value of base shear design has been made to ensure the long-term seismic performance of RCB in corrosive environments.

Keywords

reinforced concrete bridge (RCB); chloride corrosion; seismic performance; plastic hinge; overload analysis

Subject

Engineering, Civil Engineering

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