Mass damping device of rigid connection space lever of stay cable

Abstract

The invention provides a mass damping device of a rigid connection space lever. By using the mass damping device, the vibration displacements inside and outside a cable surface of a stay cable are transferred to a rotating lever by a rigid connection rod; one end of the rotating lever is connected with a lever supporting seat through a longitudinal connecting element and can rotate up and down around the lever supporting seat and rotate around a self central shaft, while the other end is connected with a mass block and a damper; when the inside and the outside of cable surface of the stay cable vibrate, the vibration displacements are transferred to the rotating lever through the rigid connection rod to drive the rotating lever, the mass block and the damper to rotate up and down or rotate around the central shaft of the rotating lever and generate inertial force, elastic force and damping force; and when the outside of the stay cable rotates, the high-damping combination of the lever supporting seat and the longitudinal connecting element also provides rotational frictional resistance and viscous force, and through the amplification by the rotating lever, the rotational frictional resistance and the viscous force are transferred back to the stay cable through the rigid connection rod so as to change the mode quality, the rigidity and the damping of the stay cable and effectively inhibit the vibrations inside or outside the cable surface of the stay cable. The mass damping device is convenient to mount and maintain and has small influence on a landscape.

Description

technical field [0001] The invention relates to a vibration damping device for suppressing the vibration of cable-stayed cables, especially suitable for the vibration control of cable-stayed cables of long-span cable-stayed bridges, belonging to the technical field of engineering structure vibration reduction, in particular to a cable-stayed bridge construction and Vibration damping device for suppressing various vibrations of stay cables during operation. Background technique [0002] The most similar prior art to the present invention is the invention of "a cable-stayed damping device" with patent number 200410009969.1, publication number CN1651656, and publication date of 2005.08.10. This invention adopts a connecting cable, one end of which is connected to the It is connected to the cable clip on the stay cable, and the other end is connected to a lever or pulley block with a weight or directly connected to a weight. The bridge deck) is vertical, and a damper is install...

AI Technical Summary

Problems solved by technology

[0002] The most similar prior art to the present invention is the invention of "a cable-stayed damping device" with patent number 200410009969.1, publication number CN1651656, and publication date of 2005.08.10. This invention adopts a connecting cable, one end of which is connected to the It is connected to the cable clip on the stay cable, and the other end is connected to a lever or pulley block with a weight or directly connected to a weight. The bridge deck) is vertical, and a damper is installed between the lever and the bridge deck or between the weight and the bridge deck. The connecting cable is always in a tensioned state through the weight, and can be easily connected vertically with any angle of the stay cable, and The damping force, elastic force and weight inertial force provided by the damper connected to the bridge deck are transmitted to change the modal mass, damping and stiffness of the vibration system to achieve the purpose of vibration reduction. The stay cable and the lever (or the bridge deck) are vertical, which can only effectively control the in-plane vibration of the stay cable, and there is a serious defect that the out-of-plane vibration of the stay cable cannot be effectively controlled

In addition, the connecting cable is a nonlinear structure, and the theoretical calculation parameters are quite different from the actual ones. It is difficult to achieve the ideal vibration reduction effect, and it is required to be in a tensioned state during use. The tensioning process and the weight of heavy objects during installation are relatively high.

At the same time, the connecting cables need to be steered through pulleys. The rigidity of the pulley’s fixing device is high, and the size of the components is large, which will also have a certain impact on the landscape of the bridge.

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