Probabilistic seismic vulnerability assessment of reinforced concrete moment frames exposed to corrosion

Document Type : Research Article

Authors

department of civil Engineering, Islamic Azad University, Science and research branch

Abstract

Earthquakes and damages caused by corrosive environmental conditions are two important factors that threaten the desirable performance of structures in the coastal cities of the Persian Gulf in southern Iran. Taking into account both of these risks in the analysis and design of structures can reduce the loss of life and can lead to significant economic savings. In recent years, studies on the probabilistic seismic vulnerability assessment of structures have been developed. In this paper, a risk-based approach is used for seismic evaluation of reinforced concrete moment frames with medium ductility that are exposed to damage due to base-chloride corrosion of longitudinal rebars in 4 important port cities of southern Iran (including Bushehr, Assaluyeh, Bandarabbas and Chabahar). A total of 18 reinforced concrete moment frames with different number of stories and in increments of 10 years after the initiation of corrosion, were subjected to increasing dynamic analysis (IDA). Then, using the risk integral, the annual probability of collapse for frames in the studied cities was obtained and evaluated. The results of this study show that over time after the initiation of corrosion, the probability of collapse of structures increases sharply, which indicates the high need for risk-based approach to evaluate and seismic design of structures that are exposed to damages due to aggressive environments.

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