Abstract
The vibration of cables in a cable-supported bridge affects its serviceability and safety. Therefore, cable dampers are essential for vibration control, monitoring, and the further maintenance of such bridges. In this study, the vibration control performance of an electrodynamic damper applied to a cable used in a footbridge was experimentally verified considering the major design variables of the damper. The damping performance was analyzed by varying the damping ratio according to the excitation condition and external circuit resistance. The acceleration and displacement at each measurement point and the frequency-domain response decreased. Considering the dominant response conditions of the cables in the bridge, an effective additional attenuation was observed. In addition, the harvesting power considering the measurement frequency and power loss was sufficient to operate a wireless measuring sensor by examining the energy harvesting performance from the cable measurement data of an actual bridge in service. Finally, a stepwise operation strategy for a cable vibration monitoring system was suggested and examined by analyzing the meteorological observation data and the power output according to the wind environment. The results demonstrate the feasibility of using an electrodynamic damper to build an integrated monitoring system capable of simultaneous cable vibration reduction and energy harvesting.
Highlights
The construction of massive civil structures, such as long-span bridges, is on the rise
To experimentally confirm the vibration control performance realized by mounting an electrodynamic damper, designed based on the major design variables, on a cable, the cable response and damping ratio under different excitation conditions of free vibration and natural frequency was examined
The results showed that the damping ratio decreased with the increase in the external resistance under all acceleration response conditions and free vibration condition and was constant regardless of the external resistance with the decrease in the acceleration response magnitude
Summary
The construction of massive civil structures, such as long-span bridges, is on the rise. According to the Korea Institute of Construction Technology, the size of the global long-span bridges market has increased sharply since 2011, and there has been a steady increase since [1]. The cable is designed to serve as the main structural member [2]. Cables, which are the main members of cable-supported bridges, are exposed to continuous loads such as vehicle and wind loads. They are under a risk of being instantly exposed to large loads such as those during earthquakes and typhoons. Continuous monitoring and maintenance of cable vibration is necessary to manage cable bridges effectively and efficiently while maintaining their serviceability and safety
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