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Probabilistic impacts of corrosion on structural failure and performance limits of reinforced concrete beams
Concrete structures in corrosive conditions have different types of uncertainties in the corrosion phases of their lifetime, which should be considered in the reliability analysis with an appropriate probabilistic model. Although corrosion is an inevitable phenomenon, it can be delayed, and the maintenance costs can be minimized by choosing the suitable methods and using the results of life cycle cost analyses. In this paper, reliability analyses were performed on the performance of concrete structures in two limit states of serviceability and structural capacity. Then, the flexural capacity obtained from modeling by the finite element method was considered as a random variable in the calculation of capacity reduction probability in the corroded beams with different corrosion percentages; this was done by defining the gamma process. Furthermore, the costs caused by the failure in the life cycle of reinforced concrete beams were evaluated and optimized using renewal process analysis in the capacity limit state. In another section, the lifetime of reinforced concrete structures subject to corrosion was investigated in the serviceability limit state, and using the performance-based destruction model, the penetration of aggressive agents of chloride ions into the structure was modeled theoretically by explaining the diffusion laws. In the next stage, the corrosion of bars produced a considerable volume of iron oxide, and the increase in stress in the concrete around the bars caused by iron oxide resulted in the cracking of cover. Probabilities were presented in an algorithmic form with the Monte Carlo method to predict the beginning time of corrosion and cracking propagation until failure. Afterward, the cost caused by failure was calculated using a performance-based life cycle cost management (LCCM) method. (C) 2020 Elsevier Ltd. All rights reserved.
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