Big-tonnage cantilever type horizontal tuned mass damper for regulating eddy-current damping

Abstract

The invention relates to a horizontal vibration energy-absorbing and vibration-damping device used for large engineering structures such as a longspan foot bridge, belonging to the field of vibration control of civil engineering structures. The horizontal vibration energy-absorbing and vibration-damping device comprises a constant strength cantilever beam consisting of struts at two sides and a cross beam, two ends of the cross beam are respectively and correspondingly connected with the struts at two sides, and the bottom ends of the struts at two sides are fixed on a foundation. The horizontal vibration energy-absorbing and vibration-damping device is characterized in that the upper end of a mass block is connected with the cross beam, the lower end of the mass block is provided with a rectangular permanent magnet; and one side of the lower part of the mass block is provided with a copper plate fixedly arranged on the foundation through a supporting member, and a gap is reserved between the copper plate and the rectangular permanent magnet. The invention ensures that the rigidity and the dampness of the tuned mass damper system realize complete separation, easily realizes that the damping ratio of TMD is continuously adjustable within a larger range though regulating the gap between the permanent magnet and the copper plate, and effectively solves the problems of oil leakage failure in the conventional TMD, difficult regulation of the damping parameters and interference on the frequency.

Description

technical field [0001] The invention belongs to the field of vibration control of civil engineering structures, and in particular relates to a large-tonnage horizontally tuned mass damper using cantilever beams and eddy currents as stiffness and damping elements respectively, which is suitable for horizontal vibration control of large-scale engineering structures such as long-span pedestrian bridges . Background technique [0002] With the increasing use of lightweight and high-strength materials and the improvement of structural aesthetic requirements, modern footbridges are becoming lighter and lighter, and have extremely small structural inherent damping ratios. In recent years, some pedestrian bridges have experienced large-scale lateral vibrations aroused by pedestrians, which seriously affect the comfort of pedestrians and the durability of bridges. Although the lateral vibration mechanism of pedestrian bridges is still in the exploratory stage, the engineering commun...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a large tonnage cantilever beam horizontal tuned mass damper with eddy current damping adjustment for the problem that the frequency and damping parameters of the existing large tonnage tuned mass damper are difficult to adjust. Adjustable tuned mass damper (TMD) with damping, and can completely separate the stiffness and damping of the tuned mass damper system, and ensure the fatigue life of elastic elements through the equal-strength design of the cantilever beam

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