Recently, application of structural health monitoring to maintenance of infrastructures is extensively expected. In order to achieve practical utilization, however, both accumulation of data and evaluation method to derive information about structural condition from the measured data are highly required. The authors have been continuously conducting the measurement of long-term behavior and structural response for a taxiway-bridge in Narita international airport for almost 5years. Acceleration measurement and video systems have also been installed to monitor vibration property of the bridge. In this paper, long-term vibration characteristics and deformation against loading are investigated. Structural analysis is also introduced to evaluate mechanism and influence of various environmental factors on response of the structures.
