Abstract
Cable structure is a major component of long-span bridges, such as cable-stayed and suspension bridges, and it transfers the main loads of bridges to the pylons. As these cable structures are exposed to continuous external loads, such as vehicle and wind loads, vibration control and continuous monitoring of the cable are required. In this study, an electromagnetic (EM) damper was designed and fabricated for vibration control and monitoring of the cable structure. EM dampers, also called regenerative dampers, consist of permanent magnets and coils. The electromagnetic force due to the relative motion between the coil and the permanent magnet can be used to control the vibration of the structure. The electrical energy can be used as a power source for the monitoring system. The effects of the design parameters of the damper were numerically analyzed and the damper was fabricated. The characteristics of the damper were analyzed with various external load changes. Finally, the vibration-control and energy-harvesting performances of the cable structure were evaluated through a hybrid simulation. The vibration-control and energy-harvesting performances for various loads were analyzed and the applicability to the cable structure of the EM damper was evaluated.
Highlights
In Korea, structural accidents, such as the collapses of the Gyeongju Maury Resort (2014) and theBusan North—South Bridge (2013), occur frequently
The performance of the EM damper was analyzed using a hybrid simulation incorporating the bridge cable properties to reflect the actual characteristics of the cable structure
Performance of the damper was analyzed using a hybrid simulation incorporating the bridge the performance of the EM damper was analyzed using a hybrid simulation incorporating the bridge cable properties to reflect the actual characteristics of the cable structure
Summary
In Korea, structural accidents, such as the collapses of the Gyeongju Maury Resort (2014) and the. Arias (2005) proposed a passive electromagnetic damping device for the vibration control for building structures [12]. The vibration-control performance of the adjustable magnetic negative stiffness damper was numerically and experimentally validated. A tubular-type linear damper was first fabricated as a vibration-control method of a cable structure, and characteristic and performance tests were conducted. The vibration-control and energy-harvesting performances of the cable structure were evaluated through a hybrid simulation that reflected the characteristics of the actual damper, rather than a numerical analysis reflecting the ideal damper model. If the radius decreased, the magnitude of the resistance per unit length increased, but the total number of turns and length both increased By considering all such trends, the coil radius change did not significantly affect the damping coefficient and density.
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