CN108678478B - Magnetorheological elastomer type coupling beam damper - Google Patents
Magnetorheological elastomer type coupling beam damper Download PDFInfo
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- CN108678478B CN108678478B CN201810357099.9A CN201810357099A CN108678478B CN 108678478 B CN108678478 B CN 108678478B CN 201810357099 A CN201810357099 A CN 201810357099A CN 108678478 B CN108678478 B CN 108678478B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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Abstract
The invention relates to a magneto-rheological elastomer type coupling beam damper which is arranged between adjacent coupling beams of a shear wall structure and is characterized by comprising a yield energy consumption assembly and a magneto-rheological damping energy consumption assembly, wherein the yield energy consumption assembly is upper U-shaped mild steel and lower U-shaped mild steel which are respectively arranged between the adjacent coupling beams of the shear wall structure, and the magneto-rheological damping energy consumption assembly is arranged in a space formed by the upper U-shaped mild steel and the lower U-shaped mild steel.
Description
Technical Field
The invention relates to the technical field of engineering, in particular to a magnetorheological elastomer type coupled beam damper.
Background
Compared with the traditional cast-in-place concrete shear wall structure, the assembled concrete shear wall structure has the advantages of high production efficiency, good component product quality, energy and material conservation and the like, and the prefabricated shear wall structure becomes an indispensable ring in the building system in China. However, due to the reason that the overall anti-seismic performance of the fabricated shear wall structure is inferior to that of a cast-in-place structure, and the like, the improvement of the anti-seismic performance of the fabricated shear wall structure is a key scientific and technical problem to be solved urgently at present.
However, the conventional prefabricated reinforced concrete shear wall structure has poor anti-seismic performance: under the action of earthquake, energy is consumed mainly by damage of the connection part of the structural components and damage of the structural components; the unbonded post-tensioning prestressed precast concrete shear wall structure has self-recovery central capacity and good shock resistance under the action of an earthquake, but the energy consumption capacity of the structure system is insufficient.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a magnetorheological elastomer type integral beam damper.
The purpose of the invention can be realized by the following technical scheme:
a magneto-rheological elastomer type coupling beam damper is arranged between adjacent shear wall structure coupling beams and comprises a yield energy consumption assembly and a magneto-rheological damping energy consumption assembly, wherein the yield energy consumption assembly is an upper U-shaped soft steel and a lower U-shaped soft steel which are respectively arranged between the adjacent shear wall structure coupling beams, and the magneto-rheological damping energy consumption assembly is arranged in a space formed by the upper U-shaped soft steel and the lower U-shaped soft steel.
Magnetic current damping power consumption subassembly include left L type rigidity steel sheet, right L type rigidity steel sheet, left permanent magnet, right permanent magnet and aluminum plate, the vertical portion of left L type rigidity steel sheet pass through the bolt fastening on left shear wall structure links the roof beam, left permanent magnet sets up the horizontal part one end at left L type rigidity steel sheet, and constitute the type of falling U structure with left L type rigidity steel sheet, the vertical portion of right L type rigidity steel sheet pass through the bolt fastening on right shear wall structure links the roof beam, right permanent magnet sets up the horizontal part one end at right L type rigidity steel sheet, and constitute the U type structure of setting with the mutual dislocation of type of falling U structure with right L type rigidity steel sheet, aluminum plate setting between left permanent magnet and right permanent magnet.
The vertical portion of the rigid steel plate of left L type, right permanent magnet, aluminum plate, left permanent magnet and the vertical portion of the rigid steel plate of right L type set gradually, vertical portion and the right permanent magnet of the rigid steel plate of left L type between and the vertical portion and the left permanent magnet of the rigid steel plate of right L type between all be equipped with magnetic current becomes elastomer.
The vertical portion of left L type rigidity steel sheet and the vertical portion of right L type rigidity steel sheet all be equipped with the fluting that is used for filling excitation coil, aluminum plate pass through the wire and be connected with excitation coil.
The aluminum plate is respectively connected with the left permanent magnet and the right permanent magnet through rubber pieces arranged at the upper end and the lower end.
The shear wall structure connecting beam generates interlayer displacement under external excitation, so that the left permanent magnet and the right permanent magnet generate dislocation vibration, and the aluminum plate generates current which is transmitted to the magnet exciting coil through the lead.
Aluminum plate's material be T6061, the material of rubber spare is A70 butadiene-acrylonitrile rubber for aluminum plate's flexonics, last U type mild steel be low yield point steel with the material of lower U type mild steel, the yield point is 100MPa, the material of left L type rigid steel plate, right L type rigid steel plate be Q550D high-strength steel, the yield point is 550MPa, left permanent magnet and right permanent magnet material be Ru ferroboron.
Compared with the prior art, the invention has the following advantages:
firstly, self-adaptive energy consumption: the damper is internally provided with the permanent magnet, the conductive aluminum plate and the excitation coil, the environment magnetic field of the magnetorheological elastomer is the superposition of the constant magnetic field of the permanent magnet and the variable magnetic field of the excitation coil, the strength of the magnetic field is changed by changing the external excitation frequency, the eddy current damping force generated by the aluminum plate is also changed, and the energy consumption of the damper is changed accordingly.
Secondly, the energy consumption is strong: the damper consumes energy jointly by the U-shaped soft steel, the conductive aluminum plate and the magnetorheological elastomer, the left L-shaped rigid steel plate and the right L-shaped rigid steel plate move up and down relatively due to interlayer displacement to drive the external U-shaped steel to yield and consume energy, the aluminum plate cuts magnetic induction lines to form vortex current inside the steel plate to generate damping energy consumption, and the magnetic field generated by output current enables the magnetorheological elastomer to generate damping energy consumption.
Thirdly, the sensitivity is high: the U-shaped steel is low-yield-point steel, can yield under small earthquake and consumes energy.
Fourthly, the replacement is convenient: the damper is connected with the connecting beam through a bolt, and is convenient to detach and replace after an earthquake.
Fifthly, easy design: the number of turns of the excitation coil, the width of the permanent magnet, the thickness of the aluminum plate and other design parameters are easy to adjust, and the influence on energy consumption is obvious.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a sectional view of the present invention, wherein fig. 2a is a sectional view taken along a line a-a in fig. 1, fig. 2B is a sectional view taken along a line B-B in fig. 1, and fig. 2C is a sectional view taken along a line C-C in fig. 1.
Fig. 3 is a dimensional diagram of the present invention.
Fig. 4 is a graph of the restoring force of the damper under three frequency excitations in the example.
The notation in the figure is:
1. the steel plate comprises an upper U-shaped soft steel, a lower U-shaped soft steel, a left L-shaped rigid steel plate, a right L-shaped rigid steel plate, a left permanent magnet, a right permanent magnet, a steel plate, an aluminum plate, a left shear wall structure connecting beam, a right shear wall structure connecting beam, 10, a magnetorheological elastomer, 11, a rubber part, 12 and a magnet exciting coil.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
Among current energy dissipating and shock absorbing elements, a link beam damper is a type of shock absorbing control device suitable for an assembled shear wall structure: the damper is in an elastic state under the action of small vibration, and provides certain rigidity for the main body structure, so that the normal use requirement of the structure is ensured; under the action of a large earthquake, the damper enters an energy consumption state firstly, generates larger damping, dissipates the energy input by the earthquake, weakens the dynamic reaction of the structure, and does not have obvious elastoplasticity of the main body structure, thereby ensuring the safety of the structure under the action of the strong earthquake. The invention aims to provide a magnetorheological elastomer type connected beam damper, which overcomes the bottleneck of the damping technology of an assembled shear wall and provides reference for damping design of an assembled shear wall structure in a high-intensity region.
As shown in fig. 1 and 2, the invention provides a magnetorheological elastomer type coupled beam damper, which is placed in a coupled beam of a shear wall structure, wherein the upper edge and the lower edge of the coupled beam are made of U-shaped mild steel, the left side and the right side of the coupled beam are provided with L-shaped rigid steel plates in a staggered manner, grooves are formed in the rigid steel plates to fill magnet exciting coils, a magnetorheological elastomer, a permanent magnet, a conductive aluminum plate and common rubber are arranged in the damper, and the conductive aluminum plate is connected with the magnet exciting coils through leads.
The technical features of the present invention will be further described below by using ABAQUS finite element software in conjunction with the accompanying drawings and the set example parameters thereof.
As shown in fig. 3, the parameters of the example link beam damper were set as follows:
(1) the U-shaped steel at the end part of the damper is a semicircle with the diameter of 300mm and the thickness of 10mm, the thickness of an external rigid steel plate is 50mm, the height of 300mm and the section width of 200 mm;
(2) the height of the two built-in magnetorheological elastomers is 170mm, the cross section size is 200mm x 70mm, and the two built-in magnetorheological elastomers are attached between the permanent magnet and the rigid steel plate;
(3) the height of each built-in permanent magnet is 200mm, the cross section size is 200mm x 50mm, and the built-in permanent magnets are attached between the magnetorheological elastomer and the common rubber;
(4) the height of two built-in common rubbers is 20mm, the cross section size is 200mm 60mm, the two built-in common rubbers are attached between two magnets, the height of an aluminum plate is 135mm, the cross section size is 200mm 30mm, and the two built-in common rubbers are attached between two rubbers.
And establishing a three-dimensional model by using ABAQUS for energy consumption characteristic analysis. The restoring force of the magnetorheological elastomer type integral beam damper mainly comprises three parts: u-shaped mild steel damping force, magnetorheological elastomer damping force and eddy current damping force. When the structure generates interlayer displacement, the two ends of the damper are relatively dislocated to drive the U-shaped mild steel to yield and consume energy, meanwhile, the aluminum plate cuts the magnetic induction line to generate eddy current damping force, current is transmitted to the excitation coil through the lead, and the generated magnetic field enables the magnetorheological elastomer to generate large damping and energy consumption.
In the damper, the conductive aluminum plate is much smaller than the aluminum plate in the eddy current energy dissipation coupling beam damper, and the damper mainly takes the energy dissipation of the magnetorheological elastomer as the main part, so the eddy current damping part is neglected. However, the magnetic field generated by the permanent magnet and the eddy current through the exciting coil has a significant influence on the performance of the magnetorheological elastomer, and the strength of the eddy current depends on the loading frequency.
Assuming that the three frequencies are 10Hz, 5Hz and 2Hz for excitation, the corresponding equivalent magnetic field strengths of the magnetorheological elastomer environment are 1T, 0.75T and 0.6T respectively. The restoring force curve of the magnetorheological elastomer damper under the excitation of three frequencies is shown in figure 4. As can be seen from the figure, the hysteretic curve of the damper under the excitation of three frequencies is in a double-fold envelope form, the shearing rigidity is high, the U-shaped steel damping force part does not depend on the loading frequency, the shearing rigidity is low, the total damping force amplitudes of 10Hz, 5Hz and 2Hz are 164kN, 124kN and 96kN respectively, and the U-shaped steel damping force amplitude is 21.1 kN. Therefore, the magneto-rheological elastomer type coupled beam damper has a remarkable advantage of reducing interlayer displacement due to the fact that the magneto-rheological elastomer type coupled beam damper provides larger rigidity, and can obviously reduce structural response under large vibration.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (2)
1. A magneto-rheological elastomer type coupling beam damper is arranged between adjacent shear wall structure coupling beams and is characterized by comprising a yield energy dissipation assembly and a magneto-rheological damping energy dissipation assembly, wherein the yield energy dissipation assembly is an upper U-shaped soft steel (1) and a lower U-shaped soft steel (2) which are respectively arranged between the adjacent shear wall structure coupling beams, the magneto-rheological damping energy dissipation assembly is arranged in a space formed by the upper U-shaped soft steel (1) and the lower U-shaped soft steel (2), the magneto-rheological damping energy dissipation assembly comprises a left L-shaped rigid steel plate (3), a right L-shaped rigid steel plate (4), a left permanent magnet (5), a right permanent magnet (6) and an aluminum plate (7), the vertical part of the left L-shaped rigid steel plate (3) is fixed on the left shear wall structure coupling beam (8) through bolts, the left permanent magnet (5) is arranged at one end of the horizontal part of the left L-shaped rigid steel plate (3), and forms an inverted U-shaped structure with the left L-shaped rigid steel plate (3), the vertical part of the right L-shaped rigid steel plate (4) is fixed on the connecting beam (9) of the right shear wall structure through bolts, the right permanent magnet (6) is arranged at one end of the horizontal part of the right L-shaped rigid steel plate (4), and forms a U-shaped structure which is staggered and interleaved with the inverted U-shaped structure with the right L-shaped rigid steel plate (4), the aluminum plate (7) is arranged between the left permanent magnet (5) and the right permanent magnet (6), the vertical part of the left L-shaped rigid steel plate (3), the right permanent magnet (6), the aluminum plate (7), the left permanent magnet (5) and the vertical part of the right L-shaped rigid steel plate (4) are sequentially arranged, and magnetorheological elastomers (10) are arranged between the vertical part of the left L-shaped rigid steel plate (3) and the right permanent magnet (6) and between the vertical part of the right L-shaped rigid steel plate (4) and the left permanent magnet (5), vertical portion of left L type rigidity steel sheet (3) and the vertical portion of right L type rigidity steel sheet (4) all be equipped with the fluting that is used for filling excitation coil, aluminum plate (7) be connected with excitation coil (12) through the wire, aluminum plate (7) through setting up rubber spare (11) at upper and lower both ends respectively with left permanent magnet (5) and right permanent magnet (6) be connected, shear force wall structure even roof beam takes place the dislocation vibration between layer displacement messenger left permanent magnet (5) and right permanent magnet (6) under the external excitation to make aluminum plate (7) produce the electric current, transmit to excitation coil (12) through the wire.
2. The magnetorheological elastomer type coupled beam damper according to claim 1, wherein the aluminum plate (7) is made of T6061, the rubber member (11) is made of A70 nitrile rubber and is used for flexible connection of the aluminum plate (7), the upper U-shaped soft steel (1) and the lower U-shaped soft steel (2) are made of low-yield-point steel, the yield point is 100MPa, the left L-shaped rigid steel plate (3) and the right L-shaped rigid steel plate (4) are made of Q550D high-strength steel, the yield point is 550MPa, and the left permanent magnet (5) and the right permanent magnet (6) are made of Ru ferroboron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810357099.9A CN108678478B (en) | 2018-04-20 | 2018-04-20 | Magnetorheological elastomer type coupling beam damper |
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| CN201810357099.9A CN108678478B (en) | 2018-04-20 | 2018-04-20 | Magnetorheological elastomer type coupling beam damper |
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| CN108678478B true CN108678478B (en) | 2020-11-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110761430B (en) * | 2019-10-28 | 2020-11-24 | 武汉理工大学 | Coupling beam damper based on magnetorheological elastomer material |
| CN110965661A (en) * | 2019-11-28 | 2020-04-07 | 同济大学 | Energy-consuming connecting beam |
| CN110984419B (en) * | 2020-01-15 | 2021-05-07 | 郑州大学 | Energy consumption device with active adjustment and self-resetting capabilities and construction method thereof |
| CN113293885A (en) * | 2021-06-30 | 2021-08-24 | 西安建筑科技大学 | Energy-consuming dry-type connecting device based on memory alloy and construction method |
| CN114718361B (en) * | 2022-04-28 | 2024-05-14 | 西安建筑科技大学 | Semi-active magnetorheological elastomer damper |
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| US7086507B2 (en) * | 2003-05-12 | 2006-08-08 | The Board Of Regents Of The University And Community College System Of Nevada On Behalf Of The University Of Nevada, Reno | Controllable magneto-rheological elastomer vibration isolator |
| CN204491884U (en) * | 2015-02-13 | 2015-07-22 | 海南大学 | Coupling beam energy-dissipating device |
| CN205421611U (en) * | 2016-04-08 | 2016-08-03 | 郑州大学 | Magnetic current becomes elastomer damping wall |
| CN107620396A (en) * | 2017-09-20 | 2018-01-23 | 同济大学 | A kind of half active current vortex laminated rubber bases system |
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