Health monitoring of a cable-stayed bridge considering the temperature change

초록

Various types of structural responses including strains, displacements, and accelerations are measured from the sensors installed in a cable-stayed bridge. Abnormal health condition of the bridge is usually judged by the pre-defined control limits for each type of responses based on the design guidelines. Since the response of a cable-stayed bridge exposed to natural environments is influenced by the change in temperature, it is necessary to evaluate the abnormality or the control limits with the consideration on the change in the structural response corresponding to the change in temperature. However, such an influential action in a cable-stayed bridge may be relatively negligible compared to those in the other types of bridges so that it is also necessary to examine the relative significance of the temperature influence on the structural responses of a cable-stayed bridge. The research provides a systematic approach of considering the change in a monitored structural response corresponding to the change in temperature: including the recovery of missing data, the elimination of the influence due to temperature change, and the evaluation of health condition of the bridge using the managed data. ARX scheme has been applied to recover response data in the missing parts. The proposed approach is examined through an application to a cable-stayed bridge. The measured data from the cable-stayed bridge for more than six years are utilized for the research.