抄録
Recently, the study of extending the service life of bridges has gained attention. Many bridges have been built during high economic-growth periods, and have now reached the end of their service life. Therefore, their rebuilding and the extension of their service life must be considered. The bridges in the Hokuriku region have been subject to harsh environmental factors. For example, flying salt due to the weather characteristics of winter, influence of water from an underground pipe with nozzles that spray liquid to melt snow, sprinkling salt as antifreeze, damage from the alkali silica reaction peculiar to Hokuriku region, and seismic risk caused by active fault zones. The bridge-inspection data was received for three prefectures in Hokuriku. The soundness of the bridge and the degree of degradation are recorded in the inspection data. In this study, we propose a repair-priority determination method considering the seismic risk by using a principal component analysis.
