Proposal for Quantitative Evaluation Methodology of Inspection Value in Maintenance of Concrete Structures Based on Repair-Risk

Appropriate asset management requires the accurate prediction of the future performance of a structure until the end of its life cycle. However, predictions of concrete structure deterioration are often executed with uncertain information since structure qualities may differ from design due to construction errors. A more accurate prediction can be obtained by inspecting the actual structure, but random inspections are not useful since the entire structure should be maintained. If the influence of inspection on the accuracy of prediction results can be quantitatively evaluated, then an efficient inspection plan that prioritizes structures can be developed.In this research, a repair-risk method is proposed to quantitatively evaluate the effect of inspection on the accuracy of predicted results. The repair-risk was calculated using the predicted results of concrete deterioration caused by corrosion-induced damage due to salt attack. The repair-risk method also considers the risk curve of the repair cost. Even when multiple structures are to be managed, an inspection plan (selecting inspection items, evaluating the effect of the inspection method, and selecting structures) can be designed using the proposed method.