Full-Scale Measurements and System Identification on Sutong Cable-Stayed Bridge during Typhoon Fung-Wong

Abstract

The structural health monitoring system (SHMS) provides an effective tool to conduct full-scale measurements on existing bridges for essential research on bridge wind engineering. In July 2008, Typhoon Fung-Wong lashed China and hit Sutong cable-stayed bridge (SCB) in China. During typhoon period, full-scale measurements were conducted to record the wind data and the structural vibration responses were collected by the SHMS installed on SCB. Based on the statistical method and the spectral analysis technique, the measured data are analyzed to obtain the typical parameters and characteristics. Furthermore, this paper analyzed the measured structural vibration responses and indicated the vibration characteristics of the stay cable and the deck, the relationship between structural vibrations and wind speed, the comparison of upstream and downstream cable vibrations, the effectiveness of cable dampers, and so forth. Considering the significance of damping ratio in vibration mitigation, the modal damping ratios of the SCB are identified based on the Hilbert-Huang transform (HHT) combined with the random decrement technique (RDT). The analysis results can be used to validate the current dynamic characteristic analysis methods, buffeting calculation methods, and wind tunnel test results of the long-span cable-stayed bridges.

Evolutionary power spectral density analysis on the wind-induced buffeting responses of Sutong Bridge during Typhoon Haikui

“…There are seven pairs of bidirectional accelerometers installed on the bridge deck, including five pairs on the main span and two on side spans. The two accelerometers in a pair are symmetric about the longitudinal bridge axis line, and the distance between them is 35.4 m. In some applications such as modal identification, this layout can successfully identify some main modes in low-frequency bands for Sutong Bridge (Wang et al, 2014b). All the accelerometers will continuously work in the service life for both normal and extreme events so that the collected data can be used for structural performance evaluation during longterm services.…”

Large Displacement Detection Using Improved Lucas–Kanade Optical Flow

“…A significant amount of research has been conducted in the field of structural health monitoring over the last two decades, with the goal of objective and quantitative structural damage detection and integrity assessment based on measurements by different sensors such as accelerometers [ 1 , 2 , 3 , 4 ]. Others expanded the method and extracted mode shapes through a power spectrum to identify the damage [ 5 , 6 ].…”

An Automatic Measurement Method of Test Beam Response Based on Spliced Images

“…Nondestructive evaluation (NDE) has shown potential for detecting hidden damage but the structures' large size presents a significant challenge to implement such inspection methods. Over the past two decades, a significant amount of studies have been conducted in the emerging field of structural health monitoring, aiming at objective and quantitative structural damage detection and integrity assessment based on measurements by sensors, mostly accelerometers [1][2][3][4][5][6][7][8][9][10][11][12].…”