Framework necessary for sustainable maintenance of local government's social capital infrastructures

About 670,000 bridges on Japanese roads will be aged rapidly in the next 20 years. Approximately 90% of these bridges are managed by local governments. It is necessary for them to manage the aged and deteriorated infrastructure effectively and efficiently. Now majority of them try to build management system for preventive maintenance of bridges, by making their own bridge life-extending repair plan (BLRP). However, in particular municipalities do not succeed. In this paper, the study pays its attention to the bridge life-extending repair plans which Japanese prefectures have formulated. From analysis of their BLRPs and a questionnaire survey on the actual situations of bridge maintenance of municipality, we make problems clear to which Japanese local governments face at stage of their maintenance. Also, in this study we propose a feasible framework for the shared data base of necessary information among related road administrators.