Structural assessment of an existing concrete bridge based on distributed strain measurement data

Abstract eng:
This paper presents the real-time monitoring results of Kawane Highway RC Bridge in Ibaraki Prefecture of Japan. The focus of the study was to evaluate the performance of the long-gauge FBG sensors packaged in the laboratory for long-term monitoring of existing bridge structure, and assess the condition of the investigated bridge using dynamic response measurements under operational and environmental loading conditions. A distributed long-gage FBG sensor based SHM system was installed on the bridge for real-time distributed strain monitoring under ambient traffic excitations and varying environmental conditions. The condition of the bridge was assessed on the basis of the proposed data normalization approach using the Normalized Modal Macrostrain (NMMS) vectors between the target and the reference macro-strain measurements. The proposed algorithm is suitable for practical civil SHM applications where variability in response and modal parameters due to measurement noise and environmental influence is often inevitable. Some changes in first modal frequency of the bridge were observed which was mainly due to the variations in environmental parameters. However, no significant changes in the slope of the fit lines were noticed indicating the healthy condition of the monitored bridge. Thorough intensive inspection of the bridge during the experimentation exercise also established the fact.

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