CN106351266B - Shear model box is laminated in a kind of the large-scale of external electromagnetic damping device - Google Patents
Shear model box is laminated in a kind of the large-scale of external electromagnetic damping device Download PDFInfo
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- CN106351266B CN106351266B CN201610838270.9A CN201610838270A CN106351266B CN 106351266 B CN106351266 B CN 106351266B CN 201610838270 A CN201610838270 A CN 201610838270A CN 106351266 B CN106351266 B CN 106351266B
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- damping device
- external electromagnetic
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- plate
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
Shear model box is laminated in large-scale the invention discloses a kind of external electromagnetic damping device, including several rectangular frames and external electromagnetic damping device；Rectangular frame is formed by four square steel pipe weldeds, and the equidistant parallel stacking of several rectangular frames forms shear model box main body, and the external electromagnetic damping device is correspondingly arranged, and vibrated with shake table along direction of vibration in shear model box main body both sides；The device includes bearing frame, wound core, cantilever plate, thin slice magnet and roller devices；The bearing frame is made of loading plate and studdle, several wound cores are fixed on loading plate, the cantilever plate is fixed on the outside of rectangular frame, its end is contactlessly above the wound core of damping device, thin slice magnet is pasted in the lower surface of cantilever plate face iron core, pole polarity is identical with working face magnetic pole magnetic on wound core.Damping device of the present invention is external, easy for installation, repeats and utilizes；Improve the similarity degree of simulation test.
Description
Technical field
Shear model box is laminated in large-scale the present invention relates to a kind of external electromagnetic damping device, belongs to geotechnical engineering vibration examination
Test field.
Background technology
Model casing is as the soil container in shaketalle test and vibration transfer device, to Rock And Soil or embedding structure in mould
The dynamic response test intended under Seismic input is most important.Since model casing side wall artificially applies stratum boundary, seismic spread
When side wall will generate wave reflection, while the presence of model casing affects natural semo-infinite soil domain or soil-structure to a certain extent
The vibration shape of system brings certain error, i.e., so-called " model casing effect " to result of the test.At present, in common mould
In molding box type, shear model box is laminated and eliminating boundary reflection and friction effect, the shear-deformable feature of the simulation soil body, avoiding
Case-resonance of soil body system and limitation soil body lateral expansion etc. has good performance, flexible compared to rigidity and cylindrical shape
Model casing is widely used in shaketalle test.
In order to which Rock And Soil actual loading and deformation mechanism, recent domestic start to incline under more realistically failure under earthquake action
Research to the shaketalle test in large scale size, large scale, high volume model casing be gradually used.With the increasing of volume
There is enough intensity and lateral rigidity, the frame number of plies and babinet weight under dynamic soil pressure effect greatly and to ensure model casing
Amount increases therewith.This aspect increases frame interlayer frictional resistance, and then influences the unidirectional free to slide of babinet, makes model casing difficult
In the form of generation is preferably shear-deformable；On the other hand, larger inertia force is generated in babinet vibration processes to influence the dynamic of soil
Force characteristic weakens control action of the soil body in vibration processes, reduces the similarity degree of free field prototype ground simulation.In addition,
It is deformed for limited model case lateral displacement and plane torsion, column and crossbeam is usually set up in case side, and protect with model cabinet frame
Surface-to-surface contact is held, this certainly will increase frictional resistance between the two, cause to generate opposite position with the soil body along the wall box of direction of vibration
It moves and brings sliding friction.
Invention content
The present invention is intended to provide shear model box is laminated in a kind of the large-scale of external electromagnetic damping device, tried for shake table
It tests, to overcome the unfavorable shadow of existing large-scale stacking shear model box frame interlayer resistance and the babinet inertia effect to result of the test
It rings.
Shear model box is laminated in a kind of the large-scale of external electromagnetic damping device provided by the invention, including several rectangle frames
Frame and external electromagnetic damping device arranged in pairs；The rectangular frame is formed by four square steel pipe weldeds, between each frame
Equipped with sliding connecting device, the rectangular frame is equidistant parallel stacking, several rectangular frames form shear model box master
Body, bottom are fixed equipped with stiff baseplate with vibration table surface；The external electromagnetic damping device is along direction of vibration in shear model
Box main body both sides are correspondingly arranged, and are vibrated with shake table；The device includes bearing frame, wound core, cantilever plate, thin slice
Magnet and roller devices；The bearing frame is made of loading plate and studdle, and several wound cores are fixed on loading plate,
Every layer of cored series connection of bearing frame institute is set of circuits, and connect slide rheostat and ammeter, to adjust and check electricity
Flow size；Magnetic screen cloth is equipped on the outside of bearing frame；The roller devices cuff is on the studdle close to model casing, every layer
Bearing frame setting is a pair of, and is contacted with the holding of place ccf layer, forms lateral antitorque constraint；The cantilever plate is located at rectangle frame
The outside of frame, end are located above the wound core of damping device, paste thin slice magnetic in the lower surface of cantilever plate face iron core
Iron；The thin slice magnet lower surface pole polarity is identical with working face magnetic pole magnetic on wound core.
In said program, the bearing frame underrun base-plate is connected with vibration table surface, bearing bottom
The area of plate is more than the area of loading plate；Loading plate is made of rectangular steel plates, and quadrangle is provided with screw hole, and studdle is from the screw hole
It passes through, loading plate is successively adjusted to design height, fixed its upper and lower surface with screw rod by nut；Due to vibration processes
There are relative motion between middle damping device and model casing, the size selection of loading plate should with cantilever plate in vibration processes not with spiral shell
Subject to bar collision.Cantilever plate is located at the top of loading plate, and face where the two is parallel to each other and does not contact.
In said program, the wound core is in a row fixed on the center of loading plate by welding or bolt connecting mode,
Its number is calculated according to the size of required power output.
In said program, above the adhesive surface face iron core of the thin slice magnet, and its bonding area should ensure that and vibrate
Iron core is arranged below always in the process.
In said program, its excess-three vertical plane that bearing frame removes cantilever plate side is sleeved on outside the magnetic screen cloth, with
Electromagnetic field interferes with each other between reduction adjacent layer.
In said program, the roller devices are by left and right valve hoop, disposed thread steel pipe, screw rod and steering wheel group into described
On valve hoop, disposed thread steel pipe is connect disposed thread steel-pipe welding by internal thread with screw rod, and the connection of the screw rod other end is universal
Wheel changes the entire length of roller devices by length of the adjusting screw rod in built-in threaded steel pipe.
In said program, rubber bag is arranged in model casing, prevents the soil body and water from being leaked out from interlayer gap；Outside tank wall
Side sets the lateral spacing plate of flexible iron sheet or rubber material perpendicular to direction of vibration, and lateral spacing plate and model casing are bolted.
In said program, in addition to bottom frame, 3~5 groups of cunnings are respectively set in every layer of frame bottom parallel with direction of vibration
Dynamic attachment device, with formed can be free to slide supporting point；The sliding connecting device is by being equipped on the coulisse of V-type groove
Lower overlapping composition, 3~5 groups of balls occur adjacent frame rack-layer relatively free to slide in V-type groove.
In said program, the studdle is equipped with 8~12, and the loading plate of studdle and every layer of bearing frame passes through
Bolt is fixedly connected.To increase the stability of bearing frame, screw rod quantity can increase according to actual conditions.
In said program, when cantilever plate length is longer, slanting bearing rib is set to reduce in the root of cantilever plate
The deflection deformation of free end.
Beneficial effects of the present invention：
(1) dead weight of model box part is turned to be undertaken by shake table by electromagnetism damping device, reduces the babinet inertia effect
With influence of the interlayer resistance to model foundation soil dynamic response, it ensure that the soil body plays control action in vibration processes, so as to most
The shear-deformable feature in limits simulation semo-infinite soil domain improves the similarity degree of test simulation；
(2) damping device uses external, easy for installation, repeats and utilizes；And the number of plies and interlamellar spacing can be according to model casings
Concrete condition is adjusted flexibly；Damping device housing magnetic screen cloth, and using the good steel plate of magnetic conductivity as bearing frame platform,
Interfering with each other for interlayer electromagnetic field can be reduced；
(3) by setting roller devices, in the case where not increasing model cabinet frame frictional resistance, babinet knot will be effectively improved
Torsional deflection in plane occurs for the lateral rigidity of structure, limitation stacking frames.
Description of the drawings
Fig. 1 is the large-scale structure diagram that shear model box is laminated of the present invention；
Fig. 2 is the enlarged structure schematic diagram of external damping device in Fig. 1；
Fig. 3 is the large-scale layout (Fig. 1 overlook directions) that shear model box is laminated of the present invention.
Fig. 4 is the enlarged structure schematic diagram of roller devices in Fig. 2；
Fig. 5 is the vertical view of Fig. 4；
In figure：1- stiff baseplates, 2- rectangular frames, 3- electromagnetism damping devices, 4- studdles, 5- nuts, 6- loading plates,
7- wound cores, 8- enameled wires, 9- cantilever plates, 10- roller devices, 11- thin slice magnet, 12- power supplys, 13- slide rheostats,
14- ammeters, 15- disposed thread steel pipes, 16- screw rods, 17- universal wheels, 18- valve hoops.
Specific embodiment
It is further illustrated the present invention below by embodiment, but is not limited to following embodiment.
Embodiment：
As shown in Fig. 1~5, shear model box is laminated in a kind of the large-scale of external electromagnetic damping device, including several rectangles
Frame 2 and external electromagnetic damping device 3 arranged in pairs；The rectangular frame 2 is formed by four square steel pipe weldeds, each frame
Between be equipped with sliding connecting device, the rectangular frame 2 be equidistant parallel stacking, several rectangular frames 2 form shearing mould
Molding box main body, bottom are fixed equipped with stiff baseplate 1 with vibration table surface；The external electromagnetic damping device 3 exists along direction of vibration
Shear model box main body both sides are correspondingly arranged, and vibrated with shake table；The device includes bearing frame, wound core, outer
Stretch plate, thin slice magnet and roller devices；The bearing frame is made of loading plate 6 and studdle 4, is fixed on loading plate 6
Several wound cores 7 are wound with enameled wire 8 on iron core, and every layer of cored series connection of bearing frame institute is set of circuits, and connect power supply
12nd, slide rheostat 13 and ammeter 14, to adjust and check size of current；Magnetic screen cloth is equipped on the outside of bearing frame；Institute
10 cuff of roller devices is stated on the studdle 4 close to model casing, the setting of every layer of bearing frame is a pair of, and with place ccf layer
Contact is kept, forms lateral antitorque constraint；The cantilever plate 9 is fixed on the outside of rectangular frame 2, and end is contactlessly located at
7 top of wound core of damping device, pastes thin slice magnet 11 in the lower surface of 9 face iron core of cantilever plate；The thin slice magnet
11 lower surface pole polarities are identical with working face magnetic pole magnetic on wound core 7.
In said program, the bearing frame underrun base-plate is connected with vibration table surface, bearing bottom
The area of plate is more than loading plate；Loading plate 6 is made of rectangular steel plates, and quadrangle is provided with screw hole, and studdle 4 is worn from the screw hole
It crosses, is fixed on loading plate 6 by bolt 5；Loading plate is successively adjusted to design height, by nut by its upper and lower surface
It is fixed with screw rod；Since there are relative motions between damping device and model casing in vibration processes, the size selection of loading plate should
Cantilever plate in vibration processes of being subject to is not collided with screw rod.Cantilever plate is located at the top of loading plate, and face where the two is parallel to each other
And it does not contact.
In said program, the wound core 7 is in a row fixed on the center of loading plate 6 by welding or bolt connecting mode
On axis, number is calculated according to the size of required power output.
In said program, above the adhesive surface face iron core of the thin slice magnet 11, and its bonding area should ensure that and shake
Iron core is arranged below always during dynamic.
In said program, its excess-three vertical plane that bearing frame removes cantilever plate side is sleeved on outside the magnetic screen cloth, with
Electromagnetic field interferes with each other between reduction adjacent layer.
In said program, the roller devices 10 are by left and right valve hoop 18, disposed thread steel pipe 15, screw rod 16 and universal wheel
17 compositions, the disposed thread steel pipe 15 are welded on valve hoop 18, and disposed thread steel pipe 15 is connect by internal thread with screw rod 16,
16 other end of screw rod connects universal wheel 17, changes roller devices by length of the adjusting screw rod 16 in built-in threaded steel pipe 15
Entire length.
In said program, rubber bag is arranged in model casing, prevents the soil body and water from being leaked out from interlayer gap；Outside tank wall
Side sets the lateral spacing plate of flexible iron sheet or rubber material perpendicular to direction of vibration, and lateral spacing plate and model casing are bolted.
In said program, in addition to bottom frame, 3~5 groups of cunnings are respectively set in every layer of frame bottom parallel with direction of vibration
Dynamic attachment device, with formed can be free to slide supporting point；The sliding connecting device is by being equipped on the coulisse of V-type groove
Lower overlapping composition, 3~5 groups of balls occur adjacent frame rack-layer relatively free to slide in V-type groove.
In said program, the studdle 4 is equipped with four in every side, altogether there is provided eight, studdle 4 with every layer
Bearing frame is fixedly connected by loading plate 6.To increase the stability of bearing frame, screw rod quantity is not limited to four, can be
1~2 screw rod is added in its outside.
In said program, when 9 length of cantilever plate is longer, slanting bearing rib is set to reduce in the root of cantilever plate
The deflection deformation of free end.
In the present embodiment, rectangular frame 2 uses cross dimensions as the rectangular of 100mm × 100mm × 3mm (height × width x thickness)
The rectangular hollow closure frame of steel-pipe welding, total high about 1.8m, closure frame inside dimension are 3.0m × 1.8m (long × wide)；
6 size of loading plate is 100cm × 30cm × 2mm (length × width x thickness), 4 a diameter of 20mm of studdle, and nut 5 advises
Lattice are M10；
9 size of cantilever plate be 60cm × 30cm × 3mm (length × width x thickness), 11 size of thin slice magnet be 60cm × 30cm ×
2mm (length × width x thickness)；
15 internal diameter of disposed thread steel pipe and 16 outer diameter of screw rod are 10mm, and universal wheel roller diameter is 20mm.
Electromagnetic attraction approximate can be calculated using the following formula：
In formula, μ0For air permeability, μ0=4 π × 10-7H/m；A is 7 area of section of wound core；Z is arrived for cantilever plate 9
The instantaneous air gap of 7 magnetic pole surfaces of wound core；N is the electromagnet coil number of turn, is determined by following formula
In formula, a is 7 diameter of iron core；B is the diameter of iron core 7 after winding enameled wire 8；D is the diameter of enameled wire 8；L1For iron
The height of core 7.
In the present embodiment, 7 diameter a of wound core is 40mm, height L1For 90mm, 8 diameter d of enameled wire is 1mm, and winding is painted
7 diameter b of wound core after envelope curve is 80mm, and instantaneous air gap z takes 9mm, and electric current selects 1.2A.After energization, wound core 7 is to thin
Piece magnet 11 generates upward electromagnetic repulsion force.It is computed, each wound core 7 can provide the suction of about 70N, i.e., each coiling iron
Core 7 generates place frame the lift of about 70N, the total life of 6 iron core common property life about 420N of every layer of frame, two groups of external drag reductions
Device 3 about alleviates 59% place ccf layer dead weight.
To prevent the spacing deformed more than with top loading plate 6 of the lower cantilever plate 9 of electromagnetic repulsion force effect, it need to be deformed into
Row checking computations.According to cantilever beam theory, cantilever plate 9 is under the action of beam-ends electromagnetism concentrated force F=420N, and free end maximum is to upper
It moves as 1.3mm, the beam-ends under gravity load 15.21N/m effects is to bottom offset less than 1mm.It is high in view of the air gap of wound core 7
It spends for 9mm, floor height 12cm, it is known that cantilever plate 9 will not be in contact with wound core 7 and upper strata loading plate 6.
Thin slice magnet available on the market has ferromagnetism more, and crisp and frangible, paste it is appropriate to the occasion by it along 9 following table of cantilever plate
Face is slowly advanced, and should not directly be pasted to inhaling, be to avoid collision brittle failure.
The middle frame number of plies of the present invention is not limited to above-mentioned 15 layers, iron core number and arrangement mode also can according to actual conditions into
Row adjustment, but should ensure that in vibration processes wound core 7 is in the lower section of thin slice magnet 11 always.In addition, electromagnetism drag reduction fills
The number of plies and interlamellar spacing for putting 3 can be selected according to the dead weight of model casing ccf layer, can every 1~2 layer arrangement, one layer of loading plate.
Claims (10)
1. shear model box is laminated in a kind of the large-scale of external electromagnetic damping device, it is characterised in that：Including several rectangular frames
With external electromagnetic damping device arranged in pairs；
The rectangular frame is formed by four square steel pipe weldeds, and sliding connecting device, the rectangle frame are equipped between each frame
Frame is equidistant parallel stacking, several rectangular frames form shear model box main body, and bottom is equipped with stiff baseplate and shake table
Table top is fixed；
The external electromagnetic damping device is correspondingly arranged, and in shear model box main body both sides with shake table along direction of vibration
Vibration；The device includes bearing frame, wound core, cantilever plate, thin slice magnet and roller devices；The bearing frame is by carrying
Plate and studdle form, and several wound cores are fixed on loading plate, every layer of cored series connection of bearing frame institute is one group of electricity
Road, and connect slide rheostat and ammeter；Magnetic screen cloth is equipped on the outside of bearing frame；The roller devices cuff is by near-lying mode
On the studdle of molding box, every layer of bearing frame setting is a pair of, and is contacted with the holding of place ccf layer；
The cantilever plate is fixed on the outside of rectangular frame, and end is contactlessly located above the wound core of damping device,
Thin slice magnet is pasted in the lower surface of cantilever plate face iron core；The thin slice magnet lower surface pole polarity and work on wound core
It is identical to make face magnetic pole magnetic.
2. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：It is described
Bearing frame underrun base-plate is connected with vibration table surface, and the area of base-plate is more than the face of loading plate
Product；Loading plate is made of rectangular steel plates, and quadrangle is provided with screw hole, and studdle is passed through from the screw hole, and loading plate is successively adjusted
To design height, its upper and lower surface is fixed with screw rod by nut；Cantilever plate is located at the top of loading plate, face where the two
It is parallel to each other and do not contact.
3. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：It is described
Wound core is in a row fixed on the center of loading plate by welding or bolt connecting mode, and number is big according to required power output
It is small to be calculated.
4. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：It is described
Above the adhesive surface face iron core of thin slice magnet, and its bonding area should ensure that iron core is placed below always in vibration processes
Side.
5. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：It is described
Its excess-three vertical plane that bearing frame removes cantilever plate side is sleeved on outside magnetic screen cloth.
6. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：It is described
Roller devices are by left and right valve hoop, disposed thread steel pipe, screw rod and steering wheel group into the disposed thread steel-pipe welding is in valve hoop
On, disposed thread steel pipe is connect by internal thread with screw rod, screw rod other end connection universal wheel, by adjusting screw rod in built-in spiral shell
Length in line steel pipe changes the entire length of roller devices.
7. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：In mould
Arrangement rubber bag in molding box；The lateral spacing plate of flexible iron sheet or rubber material, lateral spacing are set in tank wall outside vertical in direction of vibration
Plate and model casing are bolted.
8. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：The bottom of except
Outside layer frame, 3 ~ 5 groups of sliding connecting devices are respectively set in every layer of frame bottom parallel with direction of vibration；The dress that is slidably connected
It puts to be overlapped up and down by the coulisse for being equipped with V-type groove and form, adjacent frame rack-layer occurs in V-type groove in 3~5 groups of balls
It is relatively free to slide.
9. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：It is described
Studdle is equipped with 8 ~ 12, and the loading plate of studdle and every layer of bearing frame is bolted to connection.
10. shear model box is laminated in the large-scale of external electromagnetic damping device according to claim 1, it is characterised in that：When
When cantilever plate length is longer, slanting bearing rib is set to reduce the deflection deformation of free end in the root of cantilever plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610838270.9A CN106351266B (en) | 2016-09-21 | 2016-09-21 | Shear model box is laminated in a kind of the large-scale of external electromagnetic damping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610838270.9A CN106351266B (en) | 2016-09-21 | 2016-09-21 | Shear model box is laminated in a kind of the large-scale of external electromagnetic damping device |
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| Publication Number | Publication Date |
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| CN106351266A CN106351266A (en) | 2017-01-25 |
| CN106351266B true CN106351266B (en) | 2018-06-19 |
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| CN108318206B (en) * | 2018-04-13 | 2024-02-27 | 广州建设工程质量安全检测中心有限公司 | Base frequency adjustable vibrating table model test shear box with in-plane multidirectional loading |
| CN109668796B (en) * | 2019-02-01 | 2024-02-02 | 华侨大学 | double-U-shaped layered shear box simulation device and test method |
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| CN101256179A (en) * | 2007-03-01 | 2008-09-03 | 中国石油天然气股份有限公司 | Indoor test loop path for oil product drag reducer |
| CN202329796U (en) * | 2011-11-18 | 2012-07-11 | 太原理工大学 | Indoor measurement device of shear wave velocity of soil body |
| KR101606887B1 (en) * | 2014-07-28 | 2016-04-12 | 고려대학교 산학협력단 | Pile Load Test Apparatus for Helical Pile |
| CN105926691A (en) * | 2016-06-07 | 2016-09-07 | 太原理工大学 | Large cascaded shear model box internally provided with electromagnetic damping devices, and use method thereof |
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- 2016-09-21 CN CN201610838270.9A patent/CN106351266B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256179A (en) * | 2007-03-01 | 2008-09-03 | 中国石油天然气股份有限公司 | Indoor test loop path for oil product drag reducer |
| CN202329796U (en) * | 2011-11-18 | 2012-07-11 | 太原理工大学 | Indoor measurement device of shear wave velocity of soil body |
| KR101606887B1 (en) * | 2014-07-28 | 2016-04-12 | 고려대학교 산학협력단 | Pile Load Test Apparatus for Helical Pile |
| CN105926691A (en) * | 2016-06-07 | 2016-09-07 | 太原理工大学 | Large cascaded shear model box internally provided with electromagnetic damping devices, and use method thereof |
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