ABSTRACT
ABSTRACT: Because Japan has been invested a large amount of money in social infrastructure business, the enhancement level of domestic social infrastructure facilities is extremely high. On the other hand, it implies increasing maintenance cost. By 2030, more than the half of bridges will become 50 years old or more. Therefore, it is feared that the bridge and road making business will be jeopardize (at risk) by costs of the administrative, maintenance and update (rebuilding) of old ones. In addition, since a social situation of recent years changes from high growth rate into the lower ones, the worldwide concern changes from the constructing new bridges to maintenance, management, repair and reinforcement of existing bridges. As the time passes, the number of old bridges will increase and there will be limitations in monitoring the bridge behavior which presently relies on human labor. In consequence, it is difficult to maintain a required measurement level. Moreover, a lot of accidents have been reported because of overlooking important damages because such parts could not be examined by surveyors. In order to solving abovementioned problem, monitoring system is required to not only measure the minor behavior of a bridge, which is carried out by sensors installed in different positions difficult to measure by surveyors, but also collect and manage measurement data to effectively provide the measurement result for a bridge manager. Such a monitoring system should essentially be a remote measurement system which has automated and the real-time measurement functions. Additionally, the system is required in order to realizing or ensuring the effective operation of Bridge management system.
