橋梁マネジメントシステムアプリケーション

Abstract

Recently, a large number of studies were conducted on bridge asset management systems. An objective of bridge management is to compute an optimal repair policy with some indexes including the life cycle costing. However, bridge administrators often can not secure a sufficient annual budget to carry out an optimal repair strategy, so they usually have to prioritize the repairs under a budget constraint. The bridge components which can not be repaired at the optimal timing are repaired in the following time period (year). In Japan a large number of bridges are constructed during a high-growth period, and as a result it is expected that these bridges will be replaced simultaneously in the near future. This results in increasing the demand for bridge repair rapidly. On the other hand, the reduction of the fiscal expenditure resulting from the increase of the social security costs and the decrease of the tax revenues because of the declining birthrate and the “aging society” problem makes it necessary to reduce the maintenance budget of bridges. Under these conditions, in order to respond to the needs resulting from the new provision of social capital, regarding building and maintaining bridges, it is necessary to develop a bridge management system which can estimate the repair demands accurately and aid in planning the budget control efficiently. This study proposes a comprehensive bridge management system (BMS) which performs rational bridge maintenance. Furthermore, the study developed BMS computer application software to be utilized in real works of bridge maintenance. The BMS application is divided into three systems, 1) inventory system to manage the database, 2) asset management system to plan the repair strategy, and 3) accounting system to record the repair results and control the budget. The asset management system is divided into three sub-systems, a) strategy level, composed of five modules for long term budget planning, b) tactics level which decides the middle-term repair priority according to the outputs of the strategy level, and c) annual level which records the repair results for each fiscal year. The second section of this paper, presents the research fundamentals of the BMS. In the third section some methodologies of the BMS are described. The fourth section describes the usage of the BMS application. Finally, the fifth section presents a case study as it was applied to the bridge systems managed by the Himeji Office of Ministry of Land, Infrastructure and Transport.