CN-117513573-B - Variable damping tuned mass damper and construction method

CN117513573BCN 117513573 BCN117513573 BCN 117513573BCN-117513573-B

Abstract

The invention discloses a variable damping tuning mass damper and a construction method, the variable damping tuning mass damper comprises a top plate, a bottom plate, a mass block, a plurality of elastic elements, a guide assembly, an eddy current damper assembly and a position adjusting assembly, wherein the top plate and the bottom plate are oppositely arranged, the mass block is fixedly arranged on the bottom plate, connecting parts are arranged around the mass block, the plurality of elastic elements are arranged between the bottom plate and the connecting parts, the guide assembly is arranged in the elastic elements in a penetrating manner, one end of the guide assembly is fixedly connected with the bottom plate, the other end of the guide assembly movably passes through the connecting parts and is fixedly connected with the top plate, the eddy current damper assembly comprises a permanent magnet, a conductor plate and a bracket, the permanent magnet is fixedly arranged in the middle of the side wall of the mass block, the conductor plate is oppositely arranged with the permanent magnet and is connected with the position adjusting assembly through the bracket, and the conductor plate can move relative to the permanent magnet through the position adjusting assembly so as to realize adjustment of the damping size, and the vibration reduction effect of the damper is greatly improved through field test and reasonable damping design.

Inventors

WU SIYUAN
ZHANG DENGWEN
YANG YAN
YANG SHUO
WEI SEN
JIN LEI
Yu Biaozhi
LU ZHUWEN

Assignees

中国建筑第八工程局有限公司

Dates

Publication Date: 20260505
Application Date: 20231119

Claims (4)

1. The variable damping tuning mass damper is characterized by comprising a top plate, a bottom plate, a mass block, a plurality of elastic elements, a guide assembly and a position adjusting assembly, wherein the top plate and the bottom plate are oppositely arranged, the mass block is fixedly arranged on the bottom plate, connecting parts are arranged around the mass block and are formed by outwards extending the side surfaces of the mass block, the elastic elements are arranged between the bottom plate and the connecting parts, the guide assembly is arranged in the elastic elements in a penetrating mode, one end of the guide assembly is fixedly connected with the bottom plate, the other end of the guide assembly movably passes through the connecting parts and is fixedly connected with the top plate, the electric vortex damper assembly comprises a permanent magnet, a conductor plate and a support, the permanent magnet is fixedly arranged in the middle of the side wall of the mass block, the conductor plate is oppositely arranged with the permanent magnet and is connected with the position adjusting assembly through the support, the conductor plate can move relative to the permanent magnet through the position adjusting assembly, and form magnetic field intensity change, the position adjusting assembly comprises guide rails, the slide blocks and limiting blocks, the guide rails are fixedly arranged on the bottom plate, the slide blocks are slidably arranged on the guide rails and are connected with the slide blocks, and the two sides of the slide blocks are fixedly arranged on the slide blocks.
2. The variable damping tuned mass damper of claim 1, wherein the elastic element is a shape memory alloy spring, and two ends of the elastic element are fixedly connected with the connection parts of the bottom plate and the mass block respectively.
3. The variable damping tuned mass damper of claim 1, wherein the conductor plate is a copper plate.
4. A method of constructing a variable damping tuned mass damper according to any one of claims 1 to 3, comprising: (1) The vibration characteristics of the main structure are analyzed by frequency sweep analysis to obtain the vibration design frequency of the main structure; (2) The design of the optimal parameters of the AD-TMD theory is that the optimal parameters of the AD-TMD key design parameters including mass, rigidity and damping are designed based on the design vibration frequency of the main structure, and the relationship between the magnetic induction intensity and the damping ratio of the AD-TMD and the position of the sliding block is obtained through simulation and test based on the parameters of the AD-TMD; (3) The vibration characteristic of the main structure is actually measured, namely, the vibration characteristic test is carried out on the main structure on site, the deviation of the actual building structure vibration frequency and the design structure vibration frequency is obtained, and then the optimal damping under the frequency deviation is searched according to the corresponding deviation; (4) And adjusting the AD-TMD damping, namely adjusting to the optimal damping by moving the sliding block based on the optimal damping value under the corresponding deviation, fixing by a limiting block, and finally mounting the AD-TMD on the main structure.

Description

Variable damping tuned mass damper and construction method Technical Field The invention relates to the technical field of vibration control, in particular to a variable damping tuned mass damper and a construction method. Background The principle of action of the Tuned Mass Damper (TMD) is that a tuned resonance effect is formed by the additional substructure and the controlled main structure, so that vibration energy of the main structure caused by external excitation is redistributed, and the purpose of reducing structural vibration is achieved. The method is particularly suitable for improving comfort of high-rise buildings, flexible floors, bridges and the like, and also has application in earthquake engineering. The vibration characteristics of the traditional site construction structure are commonly deviated from the vibration characteristics of the design structure, the TMD is sensitive to frequency and damping, and if the TMD frequency deviates from the structure by 5%, the vibration reduction efficiency is reduced by 15%. Therefore, if the TMD vibration damping device is designed and installed in a conventional manner, i.e., manufactured according to the structural design frequency, without considering the deviation of the actual structural vibration characteristics, the TMD vibration damping effect will be greatly reduced, making it difficult to meet the intended vibration control target. The technical problem that the vibration damping effect is reduced due to the deviation of the vibration characteristics of the existing tuned mass damper and the actual building structure is that how to improve the vibration damping effect of the tuned mass damper is a problem to be solved in the field. Disclosure of Invention Aiming at the technical problem that the vibration damping effect is reduced due to the fact that the existing tuned mass damper has deviation from the vibration characteristic of an actual building structure, the invention aims to provide the variable damping tuned mass damper and the construction method, and the optimal vibration damping performance of the damper can be achieved through field test and reasonable damping design, so that the structural comfort level is improved. In order to achieve the above purpose, the variable damping tuning mass damper provided by the invention comprises a top plate, a bottom plate, a mass block, a plurality of elastic elements, a guide assembly, an eddy current damper assembly and a position adjusting assembly, wherein the top plate and the bottom plate are oppositely arranged, the mass block is fixedly arranged on the bottom plate, a connecting part is arranged around the mass block, the plurality of elastic elements are arranged between the bottom plate and the connecting part, the guide assembly is arranged in the elastic elements in a penetrating way, one end of the guide assembly is fixedly connected with the bottom plate, the other end of the guide assembly movably passes through the connecting part and is fixedly connected with the top plate, the eddy current damper assembly comprises a permanent magnet, a conductor plate and a bracket, the permanent magnet is fixedly arranged in the middle of the side wall of the mass block, the conductor plate is oppositely arranged with the permanent magnet and is connected with the position adjusting assembly through the bracket, and the conductor plate can move relative to the permanent magnet through the position adjusting assembly and form magnetic field intensity change so as to realize the adjustment of the damping of the eddy current damper assembly. Further, the mass block comprises a mass block body and a plurality of connecting parts formed by outwards extending the mass block body, wherein the mass block body is fixedly arranged on the bottom plate, and the connecting parts are formed by outwards extending the side surfaces of the mass block body. Further, the elastic element is a Shape Memory Alloy (SMA) spring, and two ends of the elastic element are fixedly connected with the connecting parts of the bottom plate and the mass block respectively. Further, the conductor plate is a copper plate. Further, the position adjusting component comprises a guide rail, a sliding block and a limiting block, wherein the guide rail is fixedly arranged on the bottom plate, the sliding block is slidably arranged on the guide rail and is connected with the bracket, and the limiting block is arranged on two sides of the sliding block and is used for fixing the sliding block. In order to achieve the above object, the present invention provides a construction method of a variable damping tuned mass damper, the construction method comprising: (1) The vibration characteristics of the main structure are analyzed, and the vibration characteristics of the main structure are simulated through sweep frequency analysis (or harmonic response analysis) to obtain the vibration frequency of the design structure of the main str