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Reliability assessment of a marine bridge structure considering Indian climatic conditions under time-variant loads

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Abstract

Environmental factors have an impact on the efficiency, serviceability, and stability of reinforced concrete (RC) structures. Chloride-induced corrosion has now been recognized as a major cause in the degradation of RC structures service life. This paper introduces a model for conducting time-variant reliability analysis of corrosion-affected bridges in India’s coastal region. The current study presents a multi-hazard approach for assessing the time-dependent reliability of RC bridges, taking into account chloride-induced corrosion hazard, time-dependent non-stationarities in load and strength, and climate change related to seasonal variation. The research was carried out using an advanced corrosion rate model that captured nonlinear behaviour, necessitating pitting corrosion as a realistic corrosion degradation process rather than uniform corrosion. Until now, most studies on corrosion deterioration of RC bridges assumed a static or time-varying degradation process that was unaffected by in situ climate conditions. The impact of climatic conditions, notably temperature and relative humidity, on the corrosion degrading process was underlined in this study. The framework demonstrates that anticipated changes in climatic factors are likely to exacerbate the failure probability of corrosion-affected bridge structures when applied to a conventional T-girder bridge (named Sardar Bridge) in Surat district of Gujarat (India). The findings emphasize the need of taking environmental parameters like temperature and relative humidity into account when analysing the reliability of RC bridges that have been subjected to chloride-induced deterioration.

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Correspondence to Mukunda Madhab Borah.

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Borah, M.M., Dey, A. & Sil, A. Reliability assessment of a marine bridge structure considering Indian climatic conditions under time-variant loads. Innov. Infrastruct. Solut. 7, 159 (2022). https://doi.org/10.1007/s41062-022-00758-3

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