Katsushika-Harp Bridge : Vibration Monitoring During Earthquakes and Results

Chanpheng, Theeraphong, Sasaki, Eiichi, Yamada, Hitoshi, Katsuchi, Hiroshi, Takahashi, Kenta

Katsushika-Harp Bridge, the curved cable-stayed bridge in Tokyo, Japan, has been monitored for its vibration during earthquakes since 1987 until present. Initially, the main purpose of the monitoring was to observe its dynamic behaviors for design verification. At that time the significant use of vibration data for health monitoring of the large scale structures, which requires a lot of sensors, was not recognized. For these reasons, only a limited number of accelerometers were installed and only limited amount of data are available. Recently, the health condition of the Katsushika-Harp Bridge has become the major concerns. By using the existing limited data, this paper proposes the simple methods to detect anomalies in the health condition. The health condition is described by the Frequency Response Functions (FRFs). The anomalies are described by: (1) the changes of the degree of non-linearity obtained from the Hilbert transform of the FRFs, and (2) the changes of the natural frequencies extracted from the FRFs. The results from the five recent earthquake records are discussed. According to the results, the proposed methods show possibilities to detect the anomalies in the health condition even from the limited data. Nevertheless, the validity of the proposed methods as well as the damage simulation based on the finite element method need to be further investigated.

Katsushika-Harp Bridge : Vibration Monitoring During Earthquakes and Results

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