To ensure the structural performance of RC superstructure of open-type wharf, which is generally located in the severe corrosion environment, periodic inspection plays a crucial role in the series of maintenance works. Application of corrosion monitoring system and sensors, which can electrochemically detect initiation of corrosion and corrosion rate quantitatively and non-destructively, is one of the most effective methods to achieve the objective inspection and diagnosis. However, applying the corrosion monitoring system and sensors to all reinforced concrete (RC) structural members in a structure is very difficult in light of cost-effective maintenance implementation although, ideally, all members should be monitored to ensure the structural performance of the target structure. It would be promising to install the corrosion sensor into the RC member exposed to the most severe corrosion environment in all members in a target structure.
　In this study, the authors analyzed relationships between deterioration rate which is evaluated with visually judged deterioration grades and location of RC members in the superstructures of 12 open-type wharves. Then, the priority of applying the corrosion monitoring was examined to determine the RC members that should be monitored for achievement of strategic maintenance. By comparing the deterioration rates of the RC beams and slabs at each location, efficient sensor installation in a superstructure of an open-type wharf was proposed. The cost analysis clarified that the monitoring using corrosion sensor is more beneficial than the conventional method when the inspection is carried out high-frequently.