Abstract
Recently, some studies have been conducted concerning the extending the service life of the bridges. Many bridges were built in the period of high economic growth, and they reached their service life. Consideration of rebuilding and extending the service life must be carried out. Ishikawa Prefecture conduct regular inspection of the bridges every 5 years. Damage of the bridge can be assessed by regular inspection. Soundness of bridge is determined by damage degree of the bridge, and is recorded as inspection results. The repair priority is decided based on soundness of bridge, but repair priority decision is not considered the seismic risk. In Ishikawa Prefecture, the Morimoto Togashi fault in the southeast edge of the Kanazawa plains is active faults. The earthquake such as magnitude 7.2 in 2-8% is expected to occur in near future. As a result of this risk evaluation, a lot of bridges will be affected by earthquake. The purpose of this study is to make the decision of repair priority including the seismic risk by using the regular inspecton data. It became clear that the repair priority of the bridge can be considered the seismic risk using principal component analysis.
