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THE USE OF CLASSICAL ROLLING PENDULUM BEARINGS (CRPB) FOR VIBRATION CONTROL OF STAY-CABLES
Last modified: 2017-12-07
Abstract
Cables are efficient structural elements that are used in cable-stayed bridges, suspension bridges and other cable structures. A significant problem which arose from the praxis is the cables’ rain-wind induced vibrations as these cables are subjected to environmental excitations. Rain-wind induced stay-cable vibrations may occur at different cable eigenfrequencies. Large amplitude Rain-Wind-Induced-Vibrations (RWIV) of stay cables are a challenging problem in the design of cable-stayed bridges.
Several methods, including aerodynamic or structural means, have been investigated in order to control the vibrations of bridge’s stay-cables. Aerodynamic methods, such as change of the cable roughness were effective only for certain classes of vibration. Another method is the coupling of the stays with secondary wires, in order to reduce their effective length and thereby to avoid resonance but this method changes the bridge’s aesthetics. Finally, external transverse dampers have to be designed for several target cable modes in order to decrease the oscillations amplitude and to finally damp them.
The present research focuses on the effectiveness of a movable anchorage system with a Classical Rolling Pendulum Bearing (CRPB) device. An analytical model of cable-damper system is developed based on the taut string representation of the cable. The gathered integral-differential equations are solved through the use of the Lagrange transformation. Finally, a case study with realistic geometrical parameters is also presented to establish the validity of the proposed system.
Several methods, including aerodynamic or structural means, have been investigated in order to control the vibrations of bridge’s stay-cables. Aerodynamic methods, such as change of the cable roughness were effective only for certain classes of vibration. Another method is the coupling of the stays with secondary wires, in order to reduce their effective length and thereby to avoid resonance but this method changes the bridge’s aesthetics. Finally, external transverse dampers have to be designed for several target cable modes in order to decrease the oscillations amplitude and to finally damp them.
The present research focuses on the effectiveness of a movable anchorage system with a Classical Rolling Pendulum Bearing (CRPB) device. An analytical model of cable-damper system is developed based on the taut string representation of the cable. The gathered integral-differential equations are solved through the use of the Lagrange transformation. Finally, a case study with realistic geometrical parameters is also presented to establish the validity of the proposed system.