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The main function of the nuclear containment structure is to prevent any radioactive leakage to the environment. The Canadian Standard Association (CSA) provides guidelines for the periodic inspection of the containment prestressed system. However, these inspections are not possible to assess directly the condition of the bonded tendons. Thus, the main objective of this research is to investigate if concrete strain measurements, obtained during inspections, can be used for evaluating the prestressing loss of these bonded systems. First, the fracture energy approach is applied for modelling the tensile strength of the concrete, using the concrete damage plasticity model. The finite element analysis (FEA) results are in good agreement compared to the test results, indicating the accuracy of the adopted modeling approach. Then, probabilistic analysis is applied, since the measured concrete strains are expected to have a distribution due to several uncertainties. The results indicate that the prestressing loss of bonded tendons seems to affect the concrete strain distribution. The proposed probabilistic framework can be used as an approach for estimating the magnitude of the prestressing loss, during periodic inspections.

Probabilistic evaluation of concrete strains for assessing prestressing loss in nuclear containment segments