CN-122014038-A - Output parameter adjustable self-resetting connecting beam damper and parameter adjusting method

CN122014038ACN 122014038 ACN122014038 ACN 122014038ACN-122014038-A

Abstract

The invention discloses a self-resetting connecting beam damper with adjustable output parameters. The damper comprises an assembled steel connecting beam, a post-tensioned unbonded prestressed steel strand providing self-resetting capability and friction damping connection for energy consumption. The damping device is characterized in that the clamping force of friction damping connection is regulated through a built-in magneto-rheological elastic gasket, and the elastic modulus of the damping device is changed in real time by controlling the intensity of a magnetic field applied to the gasket, so that the friction force of the damper is accurately regulated. The invention also discloses a parameter adjusting method based on the flag type hysteresis model. The device realizes the dynamic adaptability of damping parameters and the self-resetting function after earthquake, and remarkably improves the earthquake resistance toughness of the building structure.

Inventors

ZHANG FENGLIANG
CHEN YUFA
LIN YIN
WU BIAN
DING XIBIN
LIU YANG
LUO CHENG
HE CHANGLI
PAN QING

Assignees

中铁五局集团建筑工程有限责任公司
中铁五局集团有限公司
哈尔滨工业大学（深圳）

Dates

Publication Date: 20260512
Application Date: 20251119

Claims (9)

1. An output parameter adjustable even roof beam attenuator from restoring to throne for connect two wall limbs in the building structure, its characterized in that includes: the assembled steel connecting beam is arranged between the two wall limbs; the self-resetting assembly comprises at least one post-tensioned unbonded prestressed steel strand, and the steel strand penetrates through the steel connecting beam and is anchored to the two wall limbs, so that a restoring force is provided after the steel connecting beam is subjected to swinging deformation; at least one friction damping connection slidably connecting one end of the fabricated steel tie beam with a corresponding wall limb, the friction damping connection comprising a clamping mechanism and a friction surface for generating a friction force; at least one magnetorheological elastomer element is arranged in the clamping mechanism; a magnetic field generating device for applying a controllable magnetic field to the magnetorheological elastomer element; Wherein the modulus of elasticity of the magnetorheological elastomer element changes in response to a change in the strength of the magnetic field applied thereto by the magnetic field generating device, thereby adjusting the clamping force applied to the friction surface by the clamping mechanism and thereby adjusting the friction force of the friction damping connection.
2. The output parameter adjustable self-resetting web damper of claim 1, wherein the friction damping connection comprises: The sliding component is fixed at the end part of the steel connecting beam; The fixing component is fixed on the wall limb; The sliding component and the fixing component form the friction surface and slide relatively.
3. The output parameter adjustable self-resetting continuous beam damper as recited in claim 2, wherein the clamping mechanism comprises at least one high-strength bolt penetrating through the fixed assembly and the sliding assembly, the magnetorheological elastomer element is a magnetorheological elastic gasket, and the magnetorheological elastic gasket is arranged on a force transmission path of the high-strength bolt and is used for adjusting the pretightening force of the high-strength bolt by changing the self elastic modulus, wherein the pretightening force forms the clamping force; the magnetic field generating device is an electromagnetic coil which is arranged around the magneto-rheological elastic gasket.
4. The output parameter adjustable self-resetting beam connecting damper according to claim 1, wherein the damper swings and deforms under the action of lateral load, drives the friction damping connection to generate relative sliding so as to dissipate energy, and returns to an initial position under the action of the self-resetting assembly after the load disappears.
5. A method of parameter adjustment of a self-resetting tie-beam damper as claimed in any one of claims 1 to 4, comprising the steps of: (a) Establishing a theoretical hysteresis model describing the relation between the bending moment of the beam end of the damper and the chord rotation angle; (b) Calculating and determining a target clamping force of the friction damping connection through a control algorithm according to structural earthquake resistance requirements or real-time monitoring structural response data; (c) Calculating a target elastic modulus of the magnetorheological elastomer element required to achieve the target clamping force based on the target clamping force; (d) Controlling the magnetic field generating device to apply a magnetic field to the magnetorheological elastomer element corresponding to the target elastic modulus to adjust the clamping force of the friction damping connection to the target clamping force.
6. The method of claim 5, wherein the theoretical hysteresis model established in step (a) is a flag-type hysteresis model.
7. The method of claim 6, wherein the flag-type hysteresis model is defined by an equivalent rotational stiffness of the plurality of phases, the equivalent rotational stiffness comprising at least a stiffness value calculated according to one of the following formulas: equivalent rotational stiffness at the stage of pressure relief and static friction : , Wherein, the Is the length of the steel connecting beam, And The elastic modulus and the section moment of inertia of the self-resetting connecting beam are respectively, And The shear elastic modulus and the sectional area of the connecting beam are respectively preferable , Is poisson's ratio; correction coefficient of uneven distribution of shear stress is taken =1.2, Taking the rigidity reduction coefficient of the connecting beam of the additional deformation effect of the bolt connection node domain into consideration, wherein the rigidity reduction coefficient can be 0.3; equivalent rotational stiffness of seam opening and closing stages : , , Wherein, the The beam end bending moment generated by the tension increment of the steel strand i, Is the chord angle of the self-resetting connecting beam, ; And The elastic modulus and the sectional area of the steel strand i are respectively, The lengths of the wall limbs and the self-resetting connecting beam are respectively; The distance from the steel strand i to the rotation center; Equivalent rotational stiffness of the unloading phase of frictional force reversal : , Wherein e is a natural constant.
8. The method of claim 8, wherein in step (c), the target clamping force Target modulus of elasticity with the magnetorheological elastomeric element The relationship between them is determined by: , Wherein, the For the initial clamping force of the friction damping connection, For the initial elastic modulus of the magnetorheological elastic backing plate, Is a proportionality coefficient, which is typically found experimentally.
9. The method of claim 8, wherein the control algorithm in step (b) includes (b 1) pre-establishing key indicators in the structural response data with the target clamping force And (b 2) acquiring the monitored value of the key index in real time, and determining the target clamping force by inquiring the lookup table 。

Description

Output parameter adjustable self-resetting connecting beam damper and parameter adjusting method Technical Field The invention relates to the technical field of building structure earthquake-proof engineering and intelligent vibration-damping control, in particular to a self-resetting beam-connecting damper with adjustable output parameters and a parameter adjusting method. Background In the earthquake-resistant design of high-rise building structures, dampers are widely used as an effective energy-consuming and damping device for improving the earthquake resistance of the structures. Currently, the closest prior art to the present invention mainly includes conventional metal yielding dampers and passive fluid dampers. Metallic yielding dampers, such as mild steel dampers, operate on the principle of dissipating seismic energy by the metallic material entering a plastic deformation stage under a reciprocating load. The damper has the advantages of stable hysteresis performance and relatively low manufacturing cost. However, a core drawback is that plastic deformation is irreversible. After strong vibration, the damper generates obvious residual deformation, loses the capability of continuing to work, and has to be checked and replaced, so that the post-vibration repair cost is high and the repair period is long. Passive fluid dampers, such as oil dampers, dissipate energy through the resistance created by viscous fluid as it passes through an orifice under piston motion. Such dampers are reusable and generally do not permanently deform. But its damping coefficient is already determined at the time of manufacture and is a fixed parameter. This means that it cannot be dynamically adjusted according to the actually encountered seismic characteristics, such as variations in the spectrum, intensity and duration of the seismic waves. A damper that exhibits excellent performance in one type of earthquake motion may be energy-inefficient in another type of earthquake motion of spectral characteristics, and even adversely affect the structure because the damping force is too large or too small. Summarizing, the prior art has three significant technical bottlenecks: The parameter curing problem is that the yield force of the metal damper and the damping coefficient of the fluid damper are cured in the design and manufacturing stage. This results in a damper that is not adaptable to the non-linear and time-varying characteristics of the seismic excitation, and may suffer from insufficient energy consumption or premature saturation failure under the action of varying earthquakes. The restoring capability is lost, the traditional damper often causes larger residual deformation of the structure after strong earthquake, and the function recovery and the use safety of the building after earthquake are seriously affected. While there are solutions for providing resilience by means of additional spring elements, this can significantly increase the initial stiffness of the structure, possibly negatively affecting the comfort of the structure in normal use conditions. Intelligent control is lacking, although research has been attempted to apply intelligent materials such as magnetorheological fluid to dampers, the control strategy is limited to simple proportional-integral-derivative (PID) control, and it is difficult to effectively process the coupling relation between complex and nonlinear structural seismic response and control instructions, and the response speed and control accuracy are required to be improved. Therefore, developing an intelligent damping device which not only can adjust the mechanical parameters of the damping device in real time according to the earthquake characteristics, but also has the function of self-resetting after the earthquake so as to remarkably improve the earthquake-resistant toughness of the structure is a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide a self-resetting connecting beam damper with adjustable output parameters and a parameter adjusting method, which are used for solving the technical problems in the background technology. In order to solve the technical problems, the invention is realized by the following technical scheme: In one aspect, the present invention provides a self-resetting beam-connecting damper with adjustable output parameters, for connecting two wall limbs in a building structure, comprising: the assembled steel connecting beam is arranged between the two wall limbs; the self-resetting assembly comprises at least one post-tensioned unbonded prestressed steel strand, and the steel strand penetrates through the steel connecting beam and is anchored to the two wall limbs, so that a restoring force is provided after the steel connecting beam is subjected to swinging deformation; at least one friction damping connection slidably connecting one end of the fabricated steel tie beam with a corresponding wall limb, th