VIBRATION MEASUREMENT OF THE CABLES IN THE CABLE-STAYED BRIDGE BY THE DIGITAL IMAGE ANALYSIS AND THE EVALUATION OF THE ACCURACY OF THE MONITORING DATA

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  • 画像解析技術を用いた斜張橋ケーブルの振動計測

Abstract

<p> Since the bridge management engineers of local governments are required to carry out the close-range visual inspection every 5 years for the maintenance of bridge infrastructures, the burden of the bridge maintenance heavily weighs on the local government. Therefore in order to reduce the burden of bridge management, the national government is promoting the establishment and introduction of inspection/diagnosis methods that do not rely on close-range visual inspection.</p><p> In this study, we conducted research and development on the vibration measurement technology based on the digital image correlation method in order to improve the efficiency of cable inspection for the cablestayed bridge. Through the test of the visual image measurement targeted toward the actual bridge, we confirmed that the vibration measurement based on the digital image correlation method has the same accuracy as the measurement by the accelerometer, which has been used so far. In this paper, we report that in addition to exploring the appropriate range of cable image and subset size and position, 4K cameras are very adaptable to higher order frequency extraction in comparison of 2K and 4K cameras.</p>

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