CN108534974A - A kind of reciprocal loading system in self-balancing type space and method - Google Patents
A kind of reciprocal loading system in self-balancing type space and method Download PDFInfo
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- CN108534974A CN108534974A CN201810148092.6A CN201810148092A CN108534974A CN 108534974 A CN108534974 A CN 108534974A CN 201810148092 A CN201810148092 A CN 201810148092A CN 108534974 A CN108534974 A CN 108534974A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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Abstract
The invention discloses a kind of reciprocal loading system in self-balancing type space and methods.The loading system includes test specimen, reaction frame, hydraulic actuator, universal spherical joint end and universal hinge support to be loaded；Reaction frame is made of horizontal reaction frame and vertical reaction frame；Test specimen to be loaded lies low in horizontal reaction frame, and one end is consolidated with reaction frame, and the other end is connect by universal spherical joint end with hydraulic actuator；The other end of hydraulic actuator is connect by universal hinge support with reaction frame respectively.Universal hinge support includes end plate, otic placode, pedestal, axis pin, universal bearing and bearing block；Universal spherical joint end includes end plate, male flange, disc, two hollow hemispheres, core balls and flexural pivot pedestal.The self-balancing of power, the FREE TORSION of spatial rotational and test specimen of the hydraulic actuator when space load is realized using universal hinge support and universal spherical joint supporter when the present invention realizes experiment load using horizontal reaction frame, have the advantages that it is accurate, stablize, be convenient for measurement.
Description
Technical field
The present invention relates to a kind of reciprocal loading system in self-balancing type space and methods, belong to civil structure experiment field.
Background technology
Since earthquake motion is multidimensional, building structure will produce complicated space reaction under geological process, and structure resists
Side force component can bear axle power, two-way horizontal power, biaxial bending, even torque and act on.From the angle of structure multi-dimension Aseismic Design
It sees, considers that double horizontal seismic action can embody the true seismology of structure than only considering unidirectional horizontal earthquake action more.
Bi-directional earthquakes are simulated in experiment and always assume that the free boundary condition of test specimen cantilever, and displacement load is carried out along major-minor axis.This
It requires to discharge all rotational restraints at the top of test specimen, new requirement is proposed to experimental rig.
The space load test of existing simulation double horizontal seismic action is all much that concrete component is carried out,
Its torsional rigidity is big, and rotational restraint influences smaller；As the space load test for steel member is increasing, loading procedure band
The additional bending moment torque influence come more is difficult to ignore, and to realize the free boundary condition of test specimen top cantilever arm.Some examinations
It tests and this influence is considered with dynamic device using universal hinge, but the actuator for testing use is generally all very heavy, with moving effect
It is very poor；Some experiment actuator are hinged using devices such as pin hinges to realize with test specimen, but can sacrifice precision.
Invention content
The present invention is intended to provide a kind of reciprocal loading system in self-balancing type space and method, can realize component is carried out it is empty
Between cyclic loading test when, top universal spherical joint end can discharge rotational restraint, ensure the free perimeter strip of loading end cantilever
Part.
By the present invention in that realizing the self-balancing for testing power when loading with horizontal reaction frame, universal hinge support and ten thousand are used
The FREE TORSION that spatial rotational and to be measured test specimen of the hydraulic actuator when space is loaded are realized to ball hinged support, meets to be measured
Cantilever free boundary condition when test specimen loads, have many advantages, such as it is accurate, stablize, convenient for measurement.The present invention chooses as needed
The number for doing actuator is divided into one concentric force actuator of a lateral force actuator or two sides when using biaxial loadings
To two kinds of situations of power actuator, the male flange of two corresponding directions is only needed when at this moment assembling universal spherical joint end.When
When using unidirectional load, similarly, it is only necessary to the male flange and actuator in a direction.When using three-dimensional load, three liquid
It is respectively x-axis actuator, y-axis actuator, z-axis actuator to press actuator, and three hydraulic actuators are arranged vertically two-by-two, three liquid
Pressure actuator is connected with three end plates of universal spherical joint end by high-strength bolt respectively.
The present invention provides a kind of reciprocal loading system in self-balancing type space, including it is reaction frame, hydraulic actuator, universal
Knuckle joint end, universal hinge support；
Reaction frame is made of horizontal reaction frame and vertical reaction frame；Coupon level to be loaded is placed in horizontal reaction frame
In, test specimen one end is consolidated with reaction frame, and the other end is connect by universal spherical joint end with hydraulic actuator；Hydraulic actuator
The other end is connect by universal hinge support with reaction frame respectively；The inside of actuator is connected by universal spherical joint end, start
The outside of device is fixed by universal hinge support and reaction frame；Universal spherical joint end is fixed on test specimen；
The universal spherical joint end includes a core balls, two hollow hemispheres, flexural pivot pedestal, three discs, three flange methods
Blue, three end plates；Two hollow hemispheres form a hollow ectosphere, and core balls are located at the centre of hollow ectosphere；Universal spherical joint end
The core balls spherical surface of head and the spherical surface of hollow ectosphere are concentric sphericals；Two between hollow hemisphere and core balls by disc and convex
Lot or luck by which people are brought together orchid fixed position connects；Hollow ectosphere is connected with flexural pivot pedestal by hexagon socket head cap screw, and end plate is arranged in the outside of sphere,
And it is vertically arranged two-by-two；Hollow ectosphere connects end plate by male flange；
Universal hinge support includes：Bearing block, universal bearing, the first axis pin and the second axis pin, two otic placodes, pedestal, connection end plate；
Two otic placodes and bearing block center are equipped with hole, and two otic placodes are fixed on connection end plate, and bearing block is fixed on the base, universal shaft
It holds in the hole of bearing block, both ends connect axis pin, and axis pin passes through the hole of otic placode, otic placode, bearing block are connected as an entirety；
Hydraulic actuator is connected with the end plate of universal spherical joint end by high-strength bolt, the other end of hydraulic actuator respectively with instead
Power frame connects.
In above system, the hydraulic actuator includes 1 ~ 3, the feelings that corresponding unidirectional load, biaxial loadings, three-dimensional load
Condition；
When using unidirectional load, the male flange and actuator in a direction are set；
When using biaxial loadings, it is divided into one concentric force actuator of a lateral force actuator or two lateral force actuator two
Kind situation only needs the male flange of two corresponding directions when at this moment assembling universal spherical joint end；
When using three-dimensional load, three hydraulic actuators are respectively x-axis actuator, y-axis actuator, z-axis actuator, three liquid
Pressure actuator is arranged vertically two-by-two, and three hydraulic actuators are connected with three end plates of universal spherical joint end by high-strength bolt respectively
Connect, the other end of hydraulic actuator is connect with reaction frame respectively, and two of which hydraulic actuator is located at horizontal direction, respectively with
Two vertical edges of horizontal reaction frame are connected by universal hinge support, another hydraulic actuator is located at vertical direction, with cross
It is connected to reaction frame by universal hinge support.
In above system, the disc is fixed the relative position of hollow ectosphere and core balls by bolt, male flange
It Arbitrary Rotation can be swung between hollow ectosphere and core balls.Disc outer surface and hollow hemisphere are coplanar, inner surface and core
Bulbus cordis is coplanar, and disc is connected with hollow ectosphere by hexagon socket head cap screw.
In above system, reaction frame includes vertical reaction frame, horizontal reaction frame；Vertical reaction frame includes frame
Column and Vierendeel girder are welded H section steel, and H profile steel is equipped with bolt hole, and vertical reaction frame is assembled into high-strength bolt；
Four H profile steels of horizontal reaction frame are welded into a rectangular frame, and mutually perpendicular two H profile steels are connected by high-strength bolt
It connects, bolt hole is provided on the flange plate of H profile steel.
In above system, two hollow hemispheres and flexural pivot pedestal of universal spherical joint end are connected by high-strength hexagon socket-head bolt
It connects；Flexural pivot pedestal is connected with test specimen to be loaded using high-strength bolt.
In above system, male flange and end plate are made by the threaded hole cooperation of the tapping and end plate of male flange end
With.
In above system, universal spherical joint end hollow hemisphere is respectively equipped with three holes in male flange by place, hole it is big
Small directly related with the requirement of the rotational angle of loading arm, the center line in three holes is vertical two-by-two；The corresponding central angle in hole be 45 ° ~
90°。
In above system, actuator is connect with reaction frame by universal hinge support, and hydraulic actuator is not used to carry
Bearing, using the universal hinge support customized according to the bolt hole of frame；The bearing block of the universal hinge support connects with reaction frame
It connects, connection end plate is connected with actuator, and pedestal lower part is fixed on bearing block, and otic placode top is fixed on connection end plate, two
Otic placode is connected with bearing block by the first axis pin and the second axis pin；First axis pin one end is provided with internal thread, and second axis pin one end is set
There are external screw thread, the first axis pin and the second axis pin to link together across universal bearing.
The universal hinge support, bearing block size and trepanning are according to the structure with reaction frame junction come flexible design；
The universal hinge support, connect end plate size and trepanning according to hydraulic actuator come flexible design.
In above system, the actuator is connected with the connection end plate of universal hinge support by bolt；Axis pin passes through two ears
Plate is connected with the universal bearing for being placed in bearing block, and universal bearing is a kind of spherical bearing, and sliding contact surface is one
Internal Spherical Surface and a spherical outside surface, when movement, can be in any angle rotary oscillations, to realize hinged boundary condition.
The present invention provides a kind of reciprocal loading methods in self-balancing type space, include the following steps：
（1）It determines testing program, including specimen Design and loading scheme design, determines quantity and its load side for needing actuator
To；
（2）Universal spherical joint end is assembled according to testing program, selects the male flange quantity of needs；
（3）Test specimen is connected to design position in frame, universal spherical joint end is connected on test specimen so that universal spherical joint end plate refers to
To actuator direction, the above connection is all using high-strength bolt；Actuator head end is connected to by hexagon socket head cap screw again universal
Knuckle joint end, tail end are connect with universal hinge support by high-strength bolt, and universal hinge support and reaction frame are connected by high-strength bolt
It connects；
（4）By controlling each actuator, different loading paths are realized, to realize the loading scheme of design.
Beneficial effects of the present invention：
（1）The present invention produces the experimental condition of simulation double horizontal seismic action experiment --- and capital cantilever is free：Actuator
Both ends are connected with capital knuckle joint end, universal hinge support respectively, and the rotational restraint of capital is released, while actuator is also realized
Both ends are hinged.
（2）The experimental rig of the present invention, with being suitable for any shape, the lateral resistant member of any material progress two-way horizontal
Experiment on Function is shaken, since the rotational restraint of capital is all discharged, capital can only receive given concentrated force, and moment
It is directed toward the core balls centre of sphere, the centre of sphere accurate stress all the time and displacement can be obtained by simply solving.
Description of the drawings
Fig. 1 is the overall structure figure of the reciprocal loading system in self-balancing type space；
Fig. 2 is the structural schematic diagram of universal spherical joint end；
Fig. 3 is the part explosive view of universal spherical joint end；
Fig. 4 is the structural schematic diagram of universal hinge support；
Fig. 5 is the part explosive view of universal hinge support.
1 is frame column in figure, and 2 be Vierendeel girder, and 3 be horizontal reaction frame, and 4 be hydraulic actuator, and 5 be universal spherical joint end
Head, 6 be test specimen, and 7 be universal hinge support, and 8 be the first hollow hemisphere, and 9 be disc, and 10 be core balls, and 11 be male flange, and 12 are
End plate, 13 be flexural pivot pedestal, and 14 be the second hollow hemisphere, and 15 be connection end plate, and 16 be universal bearing, and 17 be the first axis pin, 18
It is the second axis pin for otic placode, 19,20 be bearing block, and 21 be pedestal.
Specific implementation mode
It is further illustrated the present invention below by embodiment, but is not limited to following embodiment.
Embodiment 1：
A kind of reciprocal loading system in self-balancing type space, including reaction frame, hydraulic actuator, universal spherical joint end, universal hinge
Bearing；
Reaction frame is made of horizontal reaction frame 3 and vertical reaction frame；Test specimen 6 to be loaded is horizontally placed at horizontal reaction frame
In 3,6 one end of test specimen is consolidated with reaction frame, and the other end is connect by universal spherical joint end 5 with hydraulic actuator 4；Hydraulic actuation
The other end of device 4 is connect by universal hinge support 7 with reaction frame respectively；The inside of actuator is connected by universal spherical joint end
It connects, the outside of actuator is fixed by universal hinge support and reaction frame；Universal spherical joint end is fixed on test specimen；
The universal spherical joint end 5 includes a core balls 10, the first hollow hemisphere 8, the second hollow hemisphere 14, flexural pivot pedestal
13, three end plates 12 of male flange 11, three of disc 9, three；Two hollow hemispheres form a hollow ectosphere, core balls 10
Positioned at the centre of hollow ectosphere；The core balls spherical surface of universal spherical joint end and the spherical surface of hollow ectosphere are concentric sphericals；Two skies
It is connected by disc 9 and 11 fixed position of male flange between heart hemisphere and core balls 10；Hollow ectosphere and flexural pivot pedestal 13 are logical
Hexagon socket head cap screw connection is crossed, end plate 12 is arranged in the outside of sphere, and is vertically arranged two-by-two；Hollow ectosphere passes through male flange 11
Connect end plate 12；
Universal hinge support includes：Bearing block 20, universal bearing 16, the first axis pin 17 and the second axis pin 19, two otic placodes 18, pedestals
21, end plate 15 is connected；Two otic placodes 18 and 20 center of bearing block are equipped with hole, and two otic placodes 18 are fixed on connection end plate 15, axis
Bearing 20 is fixed on pedestal 21, and universal bearing 16 is located in the hole of bearing block 20, and both ends connect axis pin, and axis pin passes through otic placode
Otic placode, bearing block are connected as an entirety by hole；
Hydraulic actuator is connected with the end plate of universal spherical joint end by high-strength bolt, the other end of hydraulic actuator respectively with instead
Power frame connects.
In above system, the hydraulic actuator includes 1 ~ 3, the feelings that corresponding unidirectional load, biaxial loadings, three-dimensional load
Condition；
When using unidirectional load, the male flange and actuator in a direction are set；
When using biaxial loadings, it is divided into one concentric force actuator of a lateral force actuator or two lateral force actuator two
Kind situation only needs the male flange of two corresponding directions when at this moment assembling universal spherical joint end；
When using three-dimensional load, three hydraulic actuators are respectively x-axis actuator, y-axis actuator, z-axis actuator, three liquid
Pressure actuator is arranged vertically two-by-two, and three hydraulic actuators are connected with three end plates of universal spherical joint end by high-strength bolt respectively
Connect, the other end of hydraulic actuator is connect with reaction frame respectively, and two of which hydraulic actuator is located at horizontal direction, respectively with
Two vertical edges of horizontal reaction frame are connected by universal hinge support, another hydraulic actuator is located at vertical direction, with cross
It is connected to reaction frame by universal hinge support.
In above system, the disc 9 is fixed the relative position of hollow ectosphere and core balls by bolt, male flange
11 Arbitrary Rotation can swing between hollow ectosphere and core balls.Disc outer surface and hollow hemisphere are coplanar, inner surface and
Core balls are coplanar, and disc is connected with hollow ectosphere by hexagon socket head cap screw.
In above system, reaction frame includes vertical reaction frame, horizontal reaction frame 3；Vertical reaction frame includes frame
Trestle 1 and Vierendeel girder 2 are welded H section steel, and H profile steel is equipped with bolt hole, and vertical counter-force frame is assembled into high-strength bolt
Frame；Four H profile steels of horizontal reaction frame are welded into a rectangular frame, and mutually perpendicular two H profile steels pass through high intensity spiral shell
It tethers and connects, bolt hole is provided on the flange plate of H profile steel.
In above system, two hollow hemispheres and flexural pivot pedestal 13 of universal spherical joint end 5 pass through hexagonal spiral shell in high intensity
It tethers and connects；Flexural pivot pedestal is connected with test specimen to be loaded using high-strength bolt.
In above system, male flange 11 and end plate 12 are matched by the tapping of male flange end and the threaded hole of end plate
It closes and uses.
In above system, 5 hollow hemisphere of universal spherical joint end is respectively equipped with three holes in male flange 11 by place, hole
Size is directly related with the requirement of the rotational angle of loading arm, and the center line in three holes is vertical two-by-two；The corresponding central angle in hole is 45 °
~90°。
In above system, actuator is connect with reaction frame by universal hinge support, and hydraulic actuator is not used to carry
Bearing, using the universal hinge support customized according to the bolt hole of frame；The bearing block 20 and reaction frame of the universal hinge support
Connection, connection end plate 15 are connected with actuator, and pedestal lower part is fixed on bearing block 20, and 18 top of otic placode is fixed on connection end plate
On 15, two otic placodes 18 and bearing block 20 are connected by the first axis pin 17 and the second axis pin 19；In first axis pin, 17 one end is provided with
Screw thread, 19 one end of the second axis pin are equipped with external screw thread, and the first axis pin 17 and the second axis pin 19 are connected to one across universal bearing 16
It rises.
The universal hinge support, bearing block size and trepanning are according to the structure with reaction frame junction come flexible design；
The universal hinge support, connect end plate size and trepanning according to hydraulic actuator come flexible design.
In above system, the actuator is connected with the connection end plate of universal hinge support by bolt；Axis pin passes through two ears
Plate is connected with the universal bearing for being placed in bearing block, and universal bearing is a kind of spherical bearing, and sliding contact surface is one
Internal Spherical Surface and a spherical outside surface, when movement, can be in any angle rotary oscillations, to realize hinged boundary condition.
The present invention provides a kind of reciprocal loading methods in self-balancing type space, include the following steps：
（1）It determines testing program, including specimen Design and loading scheme design, determines quantity and its load side for needing actuator
To；
（2）Universal spherical joint end is assembled according to testing program, selects the male flange quantity of needs；
（3）Test specimen is connected to design position in frame, universal spherical joint end is connected on test specimen so that universal spherical joint end plate refers to
To actuator direction, the above connection is all using high-strength bolt；Actuator head end is connected to by hexagon socket head cap screw again universal
Knuckle joint end, tail end are connect with universal hinge support by high-strength bolt, and universal hinge support and reaction frame are connected by high-strength bolt
It connects；
（4）By controlling each actuator, different loading paths are realized, to realize the loading scheme of design.
Claims (10)
1. a kind of reciprocal loading system in self-balancing type space, including reaction frame, hydraulic actuator, it is characterised in that：Further include
Universal spherical joint end, universal hinge support；
Reaction frame is made of horizontal reaction frame and vertical reaction frame；Coupon level to be loaded is placed in horizontal reaction frame
In, test specimen one end is consolidated with reaction frame, and the other end is connect by universal spherical joint end with hydraulic actuator；Hydraulic actuator
The other end is connect by universal hinge support with reaction frame respectively；The inside of actuator is connected by universal spherical joint end, start
The outside of device is fixed by universal hinge support and reaction frame；
The universal spherical joint end includes a core balls, two hollow hemispheres, flexural pivot pedestal, three discs, three flange methods
Blue, three end plates；Two hollow hemispheres form a hollow ectosphere, and core balls are located at the centre of hollow ectosphere；Universal spherical joint end
The core balls spherical surface of head and the spherical surface of hollow ectosphere are concentric sphericals；Two between hollow hemisphere and core balls by disc and convex
Lot or luck by which people are brought together orchid fixed position connects；Hollow ectosphere is connected with flexural pivot pedestal by hexagon socket head cap screw, and end plate is arranged in the outside of sphere,
And it is vertically arranged two-by-two；Hollow ectosphere connects end plate by male flange；
Universal hinge support includes：Bearing block, universal bearing, the first axis pin and the second axis pin, two otic placodes, pedestal, connection end plate；
Two otic placodes and bearing block center are equipped with hole, and two otic placodes are fixed on connection end plate, and bearing block is fixed on the base, universal shaft
It holds in the hole of bearing block, both ends connect axis pin, and axis pin passes through the hole of otic placode, otic placode, bearing block are connected as an entirety；
Hydraulic actuator is connected with the end plate of universal spherical joint end by high-strength bolt, the other end of hydraulic actuator respectively with instead
Power frame connects.
2. the reciprocal loading system in self-balancing type space according to claim 1, it is characterised in that：The hydraulic actuator packet
The case where including 1 ~ 3, corresponding to unidirectional load, biaxial loadings, three-dimensional load；
When using unidirectional load, the male flange and actuator in a direction are set；
When using biaxial loadings, it is divided into one concentric force actuator of a lateral force actuator or two lateral force actuator two
Kind situation only needs the male flange of two corresponding directions when at this moment assembling universal spherical joint end；
When using three-dimensional load, three hydraulic actuators are respectively x-axis actuator, y-axis actuator, z-axis actuator, three liquid
Pressure actuator is arranged vertically two-by-two, and three hydraulic actuators are connected with three end plates of universal spherical joint end by high-strength bolt respectively
Connect, the other end of hydraulic actuator is connect with reaction frame respectively, and two of which hydraulic actuator is located at horizontal direction, respectively with
Two vertical edges of horizontal reaction frame are connected by universal hinge support, another hydraulic actuator is located at vertical direction, with cross
It is connected to reaction frame by universal hinge support.
3. the reciprocal loading system in self-balancing type space according to claim 1, it is characterised in that：The disc passes through bolt
The relative position of hollow ectosphere and core balls is fixed, male flange can between hollow ectosphere and core balls Arbitrary Rotation
It swings；Disc outer surface and hollow hemisphere are coplanar, and inner surface and core balls are coplanar, and disc passes through hexagon socket head cap screw with hollow ectosphere
It is connected.
4. the reciprocal loading system in self-balancing type space according to claim 1, it is characterised in that：Reaction frame includes vertical
Reaction frame, horizontal reaction frame；Vertical reaction frame includes frame column and Vierendeel girder, is welded H section steel, and in H profile steel
Equipped with bolt hole, vertical reaction frame is assembled into high-strength bolt；Four H profile steels of horizontal reaction frame be welded into one it is rectangular
Shape frame, mutually perpendicular two H profile steels are connected by high-strength bolts, and bolt hole is provided on the flange plate of H profile steel.
5. the reciprocal loading system in self-balancing type space according to claim 1, it is characterised in that：The two of universal spherical joint end
A hollow hemisphere is connected with flexural pivot pedestal by high-strength hexagon socket-head bolt；Flexural pivot pedestal and test specimen to be loaded use high-strength bolt
It is connected.
6. the reciprocal loading system in self-balancing type space according to claim 1, it is characterised in that：Male flange and end plate are logical
The threaded hole of the tapping and end plate of crossing male flange end is used cooperatively.
7. the reciprocal loading system in self-balancing type space according to claim 1, it is characterised in that：Universal spherical joint end is hollow
Hemisphere is respectively equipped with three holes in male flange by place, and the size in hole is directly related with the requirement of the rotational angle of loading arm, and three
The center line in a hole is vertical two-by-two；The corresponding central angle in hole is 45 ° ~ 90 °.
8. the reciprocal loading system in self-balancing type space according to claim 7, it is characterised in that：Actuator and reaction frame
It being connected by universal hinge support, the bearing block of the universal hinge support is connect with reaction frame, and connection end plate is connected with actuator,
Pedestal lower part is fixed on bearing block, and otic placode top is fixed on connection end plate, and two otic placodes and bearing block pass through the first axis pin
It is connected with the second axis pin；First axis pin one end is provided with internal thread, and second axis pin one end is equipped with external screw thread, the first axis pin and the second pin
Axis links together across universal bearing.
9. the reciprocal loading system in self-balancing type space according to claim 7, it is characterised in that：The actuator and universal
The connection end plate of hinged-support is connected by bolt；Axis pin passes through two otic placodes, is connected with the universal bearing for being placed in bearing block, universal shaft
It is a kind of spherical bearing to hold, and sliding contact surface is an Internal Spherical Surface and a spherical outside surface, and when movement can be in random angle
Rotary oscillation is spent, to realize hinged boundary condition.
10. a kind of reciprocal loading method in self-balancing type space, past using claim 1 ~ 9 any one of them self-balancing type space
It is added with loading system, it is characterised in that：Include the following steps：
（1）It determines testing program, including specimen Design and loading scheme design, determines quantity and its load side for needing actuator
To；
（2）Universal spherical joint end is assembled according to testing program, selects the male flange quantity of needs；
（3）Test specimen is connected to design position in frame, universal spherical joint end is connected on test specimen so that universal spherical joint end plate refers to
To actuator direction, the above connection is all using high-strength bolt；Actuator head end is connected to by hexagon socket head cap screw again universal
Knuckle joint end, tail end are connect with universal hinge support by high-strength bolt, and universal hinge support and reaction frame are connected by high-strength bolt
It connects；
（4）By controlling each actuator, different loading paths are realized, to realize the loading scheme of design.
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Cited By (3)
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| CN110095349A (en) * | 2019-05-22 | 2019-08-06 | 太原理工大学 | A kind of space loading system and method suitable for bending unstability |
| CN114264458A (en) * | 2021-11-10 | 2022-04-01 | 徐州徐工挖掘机械有限公司 | Fatigue life testing device and testing method for counterweight support |
| CN114279667A (en) * | 2022-03-07 | 2022-04-05 | 成都理工大学 | Pseudo-static anti-seismic test device and method for wallboard joint |
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