CN110631927A - Shear test simulation teaching device of concrete test block - Google Patents
Shear test simulation teaching device of concrete test block Download PDFInfo
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- CN110631927A CN110631927A CN201910988178.4A CN201910988178A CN110631927A CN 110631927 A CN110631927 A CN 110631927A CN 201910988178 A CN201910988178 A CN 201910988178A CN 110631927 A CN110631927 A CN 110631927A
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- 238000012360 testing method Methods 0.000 title claims abstract description 209
- 238000004088 simulation Methods 0.000 title claims abstract description 37
- 238000006073 displacement reaction Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 238000007405 data analysis Methods 0.000 claims description 9
- 230000006870 function Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract 1
- 238000010008 shearing Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004422 calculation algorithm Methods 0.000 description 3
- 238000012669 compression test Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000010223 real-time analysis Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
Abstract
The invention relates to a shear test simulation teaching device of a concrete test block, which comprises a universal testing machine, wherein the universal testing machine comprises an upper pull head and a lower pull head, and also comprises an n-arm bracket connected with the upper pull head, an m-arm bracket connected with the lower pull head, n + m square-shaped clampers and a displacement acquisition device, wherein n + m is equal to the number of layers of the concrete test block; the square-shaped clamp holder mainly comprises 4L-shaped arms and 3-4 telescopic regulators, and each telescopic regulator is connected with two adjacent L-shaped arms respectively; each arm of the n-arm support or the m-arm support is respectively connected with 1 telescopic regulator of the square clamp holder, and when n or m is larger than 1, the n-arm support or the m-arm support is provided with a telescopic regulator for regulating the distance between two adjacent square clamp holders; the displacement acquisition device is used for acquiring relative displacement values of two adjacent layers in the concrete test block in the test process. The device can conveniently realize the shear force test of the test block, and has low requirement on the testing machine, flexible assembly and convenient installation.
Description
Technical Field
The invention belongs to the technical field of test equipment, and relates to a shear test simulation teaching device for a concrete test block.
Background
In the teaching of mechanical test, the tensile, compression and shear test of concrete test block is an indispensable teaching course, and often simulation test is needed. At present, the test operation of the concrete test block is mostly carried out by using a universal testing machine, the device can carry out mechanical tests of various tests such as stretching, compression, bending and torsion, and the like, and students can visually understand the test flow by adopting the tests. However, most of the existing universal testing machines can only carry out tensile and compression tests, and the shear test of the concrete test block is difficult to be taught and practiced in the process of teaching by using the universal testing machines.
Therefore, the above-mentioned test alone is not suitable for a complete teaching demonstration, and the student cannot effectively and intuitively observe and understand the process of the shear test, and further improvement is required. In addition, when a mechanical test is performed, many testing machines can only output a curve chart of fixed experimental data, but cannot output a required experimental result, which brings much inconvenience and trouble to experimental research.
Disclosure of Invention
The invention aims to overcome the defects that the prior art cannot carry out the shear test of a concrete test block and cannot output the required test result, and provides a simulation teaching device for the shear test of the concrete test block.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a shear test simulation teaching device of concrete test block, including universal testing machine, universal testing machine includes top pull head and lower pull head, concretely, universal testing machine includes the testing machine body, top pull head and lower pull head set up relatively from top to bottom in the testing machine body, still include n arm support of being connected with top pull head, m arm support of being connected with lower pull head, n + m mouth font holder and displacement collection system, n and m are more than or equal to 1's positive integer, n + m equals the number of piles of concrete test block, the arm number of the support of being connected with top pull head and lower pull head can be according to the number of piles adaptability adjustment of concrete test block, for example, when the concrete test block is the three-layer, top pull head connects single armed support, lower pull head connects double-arm support, when the concrete test block is the four-layer, top pull head connects double-arm support, lower pull head connects double-arm support, need guarantee the support of being connected with concrete test block adjacent two-layer when the shear test simulation teaching device of concrete block uses The upper pull head and the lower pull head are respectively connected to ensure that the concrete test block is uniformly stressed;
the square-shaped clamp holder mainly comprises 4L-shaped arms and 3-4 telescopic regulators (the 4L-shaped arms surround clockwise or anticlockwise to form a square shape), and each telescopic regulator is connected with two adjacent L-shaped arms respectively;
each arm of the n-arm support or the m-arm support is respectively connected with 1 telescopic regulator of the square clamp holder, and when n or m is larger than 1, the n-arm support or the m-arm support is provided with a telescopic regulator for regulating the distance between two adjacent square clamp holders;
the displacement acquisition device is used for acquiring relative displacement values of two adjacent layers in the concrete test block in the test process.
The common structures of the universal testing machine are two types, one type is the universal testing machine which comprises an upper pressure head and a lower pressure head and is used for a compression test, the other type is the universal testing machine which comprises an upper pull head and a lower pull head and is used for a tensile test, the former can be used for the compression test of a concrete test block, however, the upper pressure head and the lower pull head cannot clamp the concrete test block, so that the shear test cannot be carried out, the latter is mainly used for the tensile test of a metal plate, the upper pull head and the lower pull head only clamp the edges of the upper side and the lower side of the metal plate in the test process, when the universal testing machine is used for the shear test of the concrete test block, the concrete test block cannot be effectively clamped due to the block structure of the concrete test. According to the universal testing machine, the universal testing machine is improved, the n-arm support connected with the upper pull head, the m-arm support connected with the lower pull head and the n + m square-shaped clamps are added, so that a concrete test block can be effectively clamped, the upper pull head pulls the n-arm support to move upwards in the testing process to drive the concrete test block fixed by the square-shaped clamps connected with the n-arm support to move upwards, the lower pull head pulls the m-arm support to move downwards to drive the concrete test block fixed by the square-shaped clamps connected with the m-arm support to move downwards, the smooth performance of a shear test is ensured, and meanwhile, through the structural design, a clamping structure can adapt to concrete test blocks with different sizes. In addition, the invention is additionally provided with a displacement acquisition device, so that not only the test force but also the relative displacement of the concrete test block can be acquired in the shearing test process, and the relationship between the displacement and the test force can be further analyzed.
As a preferable scheme:
according to the shear test simulation teaching device for the concrete test block, the number of the telescopic regulators in each square-shaped clamp holder is 3, 2 of the telescopic regulators are opposite telescopic regulators, 1 of the telescopic regulators is independent, and the n-arm support or the m-arm support is connected with the independent telescopic regulators; 1 of 4L-shaped arms in each square-shaped clamp holder is an arm a, 2L-shaped arms adjacent to the arm a are an arm b and an arm d respectively, and each L-shaped arm consists of a cross arm and a vertical arm. The quantity of L shape arm is 4, the quantity of flexible regulator is 3, each flexible regulator is connected with two adjacent L shape arms respectively, consequently, there is the condition that two adjacent L shape arms do not have a connection, though do not have a connection, but connect through flexible regulator between other L shape arms and can guarantee that the distance between these two adjacent and unconnected L shape arms can change along with it, be 4 square-shaped holders for the quantity of flexible regulator, the square-shaped holder structure that the quantity of flexible regulator is 3 is simpler, it is more convenient to operate.
As above shear test simulation teaching device of concrete test block, relative flexible regulator all is the activity handle, wherein 1 is connected with arm an and arm d, and concrete connection structure is: the vertical arms of the arm a and the arm d are respectively provided with a group of through holes, the movable handle simultaneously penetrates through 1 through hole on the vertical arms of the arm a and the arm d, and telescopic adjustment can be realized by selecting different through holes on the arm a and the arm b. The structures of the opposite telescopic adjusters are not limited to the above structures, as long as the relative positions of the two adjacent L-shaped arms can be ensured to be adjustable, and the structures of the opposite telescopic adjusters can be different, which are within the protection scope of the invention.
In the above simulation teaching device for the shear test of the concrete test block, the independent telescopic regulator is connected with the arm a and the arm b, the cross arm of the arm a is provided with the insection, and the cross arm of the arm a and the independent telescopic regulator form a member with the functions of stopping and unlocking. The structure of independent flexible regulator is not limited to this, as long as can guarantee that the relative position of two adjacent L shape arms is adjustable can, the concrete structure of the component that has the stopping and unblock function is not limited, can be structure such as ribbon, the regulation that realizes length through the insection on the L shape arm and flexible regulator cooperation is more favorable to realizing the accurate regulation of length for the regulation that realizes length through-hole on the L shape arm and flexible regulator cooperation, because two adjacent insections interval (about 2mm) are far less than two adjacent through-hole intervals.
As above shear test simulation teaching device of concrete test block, independent flexible regulator mainly comprises block, unblock switch and be located the internal insection board of block and swash plate, the inside passageway that is equipped with of block, insection board and swash plate are the rectangular plate, insection board one end and block fixed connection, the other end and swash plate fixed connection form the V-arrangement board, the one end and the insection board and the unblock switch of swash plate are connected, the other end and block swing joint.
As above shear test simulation teaching device of concrete test block, the unblock switch is the U-shaped ring form (the shape design of unblock switch mainly considers simple operation nature and consumptive material quantity), still is equipped with elastic element (for example spring, elastomer etc.) between swash plate and the block, and elastic element is the part that can have or not, and elastic element more is favorable to the swash plate to reset fast, need rely on the elasticity restoring force realization of swash plate and block junction to reset when no elastic element.
According to the shear test simulation teaching device for the concrete test block, when n or m is equal to 1, the n-arm support or the m-arm support is a straight rod;
when n or m is greater than 1, the n-arm support or the m-arm support mainly comprises a cross rod, an upper vertical rod and n or m lower vertical rods, all the vertical rods are vertically connected with the cross rod, the upper vertical rod and the lower vertical rods are positioned on two sides of the cross rod, the upper vertical rod is connected with an upper pull head or a lower pull head, the lower vertical rod is connected with the square-shaped clamp holder, and a telescopic regulator is arranged on a cross rod section between every two adjacent vertical rods (namely the cross rod between every two adjacent vertical rods is a telescopic rod, the specific structure is not limited, and the telescopic function is within the protection range of the invention).
According to the shear test simulation teaching device for the concrete test block, the lower vertical rod is connected with the square-shaped clamp holder through the hinge joint, so that the flexibility of the square-shaped clamp holder in movement is improved, and the concrete test block is fixed more conveniently.
As above shear test simulation teaching device of concrete test block, displacement collection system mainly comprises detachable support, laser displacement sensor and can dismantle the dull polish baffle, detachable support and n arm leg joint (concrete junction position is not limited), laser displacement sensor installs at detachable support, can dismantle dull polish baffle and m arm leg joint (concrete junction position is not limited) for receive the laser that laser displacement sensor sent, laser displacement sensor's working method is exactly the distance of calculating laser emission, obtains the relative displacement value.
The shear test simulation teaching device for the concrete test block further comprises a data analysis device, wherein the data analysis device is respectively connected with the laser displacement sensor and the universal testing machine, can be a computer and the like, is used for receiving the test force of the universal testing machine and the displacement of the displacement acquisition device and then analyzing the relation between the displacement and the test force, specifically designs a related algorithm according to a teaching purpose and is realized by utilizing python language coding.
Has the advantages that:
(1) according to the simulation teaching device for the shear test of the concrete test block, the n-arm support with the square-shaped clamp holder is arranged on the upper pull head, and the m-arm support with the square-shaped clamp holder is arranged on the lower pull head, so that the test mode of the conventional universal testing machine can be effectively changed, the shear test of the concrete test block is conveniently realized, the requirement on the testing machine is low, the device is flexible to assemble, and the device is convenient to install;
(2) according to the shear test simulation teaching device for the concrete test block, the plurality of telescopic regulators are arranged in the square-shaped clamp holder and on the n-arm support or the m-arm support, so that the square-shaped clamp holder is adjustable in size and can adapt to concrete test blocks of different sizes;
(3) according to the shear test simulation teaching device for the concrete test block, the hinge joint is arranged between the n-arm support or the m-arm support and the square-shaped clamp, so that the flexibility of the movement of the square-shaped clamp is improved, and the concrete test block can be conveniently fixed;
(4) the shear test simulation teaching device for the concrete test block can collect displacement data in the test process of the shear test teaching device, and then select a required analysis method for analysis according to the teaching purpose, so that the test result is rapidly and visually output, the test process is visually and intuitively expressed, and certain convenience is brought to teaching.
Drawings
FIG. 1 is a schematic structural diagram of a shear test arm (i.e., an integral body composed of a double-arm support, a single-arm support, 3 square-shaped grippers and a displacement acquisition device) in the shear test simulation teaching device for a concrete test block of the present invention;
FIG. 2 is a schematic structural diagram of a shear test arm in the simulation teaching device for shear test of a concrete test block according to the present invention when testing the concrete test block;
FIG. 3 is a schematic structural diagram of a tooth chain bayonet (i.e., an integral body composed of a block body, a toothed plate, an inclined plate and an unlocking switch) in the shear test simulation teaching device for a concrete test block of the present invention;
FIG. 4 is an unlocking schematic diagram of a square-shaped clamp in the shear test simulation teaching device for the concrete test block of the invention;
FIG. 5 is a schematic locking view of a square-shaped clamp in the shear test simulation teaching apparatus for a concrete test block according to the present invention;
FIG. 6 is a schematic view of the overall structure of the shear test simulation teaching apparatus for a concrete test block according to the present invention;
FIG. 7 is a data analysis flow chart of the shear test simulation teaching apparatus for a concrete block according to the present invention;
FIG. 8 is a graph of experimental force versus displacement;
the device comprises a double-arm support 1, a single-arm support 2, a telescopic regulator on the double-arm support 3, a 4-hinged joint, a 5-square-shaped clamp holder, a 6-detachable support, a 7-detachable frosted baffle, a 8-laser displacement sensor, a 9-concrete test block, a 10-block, a 11-corrugated plate, a 12-unlocking switch, a 13-arm a, a 14-arm b, a 15-arm d, a 16-movable handle, a 17-upper pull head, an 18-lower pull head, a 19-testing machine body and a 20-inclined plate.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "lateral", "vertical", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and the like are to be construed broadly and, for example, may be fixedly connected, detachably connected, or integrally connected unless otherwise specifically stated or limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
A shear test simulation teaching device of a concrete test block is shown in figures 1, 2 and 6 and comprises a universal testing machine, wherein the universal testing machine comprises an upper pull head 17 and a lower pull head 18 (the universal testing machine comprises a testing machine body 19, the upper pull head 17 and the lower pull head 18 are arranged in the testing machine body 19 in a vertically opposite mode), the shear test simulation teaching device further comprises a double-arm support 1 connected with the upper pull head 17, a single-arm support 2 connected with the lower pull head 18, 3 mouth-shaped clamps 5, a displacement acquisition device and a data analysis device, and the number of layers of the concrete test block 9 is 3;
as shown in fig. 4 and 5, the square-shaped holder 5 mainly comprises 4L-shaped arms and 3 telescopic adjusters, each telescopic adjuster is respectively connected with two adjacent L-shaped arms, 2 of the 3 telescopic adjusters are opposite telescopic adjusters, 1 is an independent telescopic adjuster, and the double-arm support 1 or the single-arm support 2 is connected with the independent telescopic adjuster; 1 of 4L-shaped arms in each square-shaped clamp holder is an arm a 13, 2L-shaped arms adjacent to the arm a are an arm b 14 and an arm d15 respectively, and each L-shaped arm consists of a cross arm and a vertical arm;
the relative telescopic regulator is all movable handle 16, and wherein 1 is connected with arm a 13 and arm d15, and concrete connection structure is: a group of through holes are respectively arranged on the vertical arms of the arm a 13 and the arm d15, and the movable handle 16 simultaneously passes through 1 through hole on the vertical arms of the arm a 13 and the arm d 15;
the independent telescopic regulator is connected with an arm a 13 and an arm b 14, the cross arm of the arm a 13 is provided with insections, and the cross arm of the arm a 13 and the independent telescopic regulator form a member with functions of stopping and unlocking;
as shown in fig. 3, the independent telescopic regulator mainly comprises a block body 10, an unlocking switch 12, and a corrugated plate 11 and an inclined plate 20 which are located in the block body 10, wherein a channel is arranged in the block body 10, the corrugated plate 11 and the inclined plate 20 are rectangular plates, one end of the corrugated plate 11 is fixedly connected with the block body 10, the other end of the corrugated plate 11 is fixedly connected with the inclined plate 20 to form a V-shaped plate, one end of the inclined plate 20 is connected with the corrugated plate 11 and the unlocking switch 12, the other end of the inclined plate is movably connected with the block body 10, and the unlocking switch 12 is in a U-shaped annular;
each arm of the double-arm support or the single-arm support is respectively connected with 1 telescopic regulator of the square-shaped clamp holder 5, and the single-arm support 2 is a straight rod; the double-arm support 1 mainly comprises a cross rod, an upper vertical rod and two lower vertical rods, wherein all the vertical rods are vertically connected with the cross rod, the upper vertical rod and the lower vertical rods are positioned on two sides of the cross rod, the upper vertical rod is connected with an upper pull head 17 or a lower pull head 18, the lower vertical rods are connected with a square-shaped holder 5 through hinges 4, and a telescopic regulator 3 is arranged on a cross rod section between every two adjacent vertical rods;
the displacement acquisition device is used for acquiring relative displacement values of two adjacent layers in the concrete test block 9 in the test process;
the displacement acquisition device mainly comprises a detachable support 6, a laser displacement sensor 8 and a detachable frosted baffle 7, wherein the detachable support 6 is connected with the double-arm support 1, the laser displacement sensor 8 is arranged on the detachable support 6, and the detachable frosted baffle 7 is connected with the single-arm support 2 and used for receiving laser emitted by the laser displacement sensor 8;
the data analysis device is respectively connected with the laser displacement sensor 8 and the universal testing machine, and is used for receiving the test force of the universal testing machine and the displacement of the displacement acquisition device and then analyzing the relation between the displacement and the test force, as shown in fig. 7, the analysis process is as follows:
step.1 start the experiment;
installing a laser displacement sensor 8 of a displacement acquisition device on a detachable support 6, installing a detachable frosted baffle 7 on a single-arm support 2, screwing an upper pull head 17 and a lower pull head 18, setting the laser displacement sensor 8 to zero, and acquiring relative displacement values of two adjacent layers in a concrete test block 9 in the test process;
step.2, data acquisition;
the data analysis device identifies the data of the displacement acquisition device and receives a real-time relative displacement value;
step.3, establishing a database;
storing the test data of each time in real time according to the data acquired by the universal testing machine and the test data received in Step2, and establishing a database;
step.4, selecting a corresponding analysis method according to the experimental requirements:
(1) visualizing the experiment result, wherein the result is shown in fig. 8;
(2) automatically identifying the shearing ring breaking value of the concrete test block: for completeness of the teaching test, real-time analysis of test data is required, a shearing ring-breaking value discrimination algorithm is added in the embodiment, and the shearing ring-breaking value calculation formula is as follows:
Ek(x)＝FB(k，xB)-FA(k，xA)
wherein k is the number of tests, xA，xBIs the relative displacement value of two adjacent layers in the concrete test block, FA(k，xA) For the kth test, the relative displacement value is xATest force of (D), FB(k，xB) For the kth test, the relative displacement value is xBThe test force of (1);
when E isk(x) When the shearing ring breaking value is less than zero, the shearing ring breaking value of the concrete test block is judged, the algorithm is realized by utilizing python language, and the specific process takes the first test force as an example and inputs the first test force<F＝[]，F.append(Fxi)，E1x-F[-1]-F[-2]，if E1x＜0:，print(F[-1])>Output test force FBThe test force is the test force when the test block is damaged;
(3) converting the current data in the database into a plurality of data formats for export;
the invention can effectively change the existing teaching test mode by using a universal testing machine, conveniently realize the shear force test of the test block, enable students to intuitively understand and observe the complete process and data analysis result of the shear test, effectively shorten the test time and improve the teaching efficiency.
Example 2
The shear test simulation teaching device of the concrete test block is basically the same as that in embodiment 1, and is different in that an elastic element is further arranged between the inclined plate and the block body.
Claims (10)
1. The utility model provides a shear test simulation teaching device of concrete test block, includes universal tester, universal tester includes pull head and lower pull head, characterized by: the device also comprises an n-arm support connected with the upper pull head, an m-arm support connected with the lower pull head, n + m square-shaped clampers and a displacement acquisition device, wherein n and m are positive integers more than or equal to 1, and n + m is equal to the number of layers of the concrete test block;
the square-shaped clamp holder mainly comprises 4L-shaped arms and 3-4 telescopic regulators, and each telescopic regulator is connected with two adjacent L-shaped arms respectively;
each arm of the n-arm support or the m-arm support is respectively connected with 1 telescopic regulator of the square clamp holder, and when n or m is larger than 1, the n-arm support or the m-arm support is provided with a telescopic regulator for regulating the distance between two adjacent square clamp holders;
the displacement acquisition device is used for acquiring relative displacement values of two adjacent layers in the concrete test block in the test process.
2. The shear test simulation teaching device for the concrete test block as claimed in claim 1, wherein the number of the telescopic adjusters in each square-shaped holder is 3, 2 of the telescopic adjusters are opposite telescopic adjusters, 1 is an independent telescopic adjuster, and the n-arm support or the m-arm support is connected with the independent telescopic adjuster; 1 of 4L-shaped arms in each square-shaped clamp holder is an arm a, 2L-shaped arms adjacent to the arm a are an arm b and an arm d respectively, and each L-shaped arm consists of a cross arm and a vertical arm.
3. The device for simulating and teaching the shear test of the concrete test block as claimed in claim 2, wherein the relative telescopic adjusters are movable handles, 1 of which is connected with the arm a and the arm d, and the concrete connection structure is as follows: the vertical arms of the arm a and the arm d are respectively provided with a group of through holes, and the movable handle simultaneously passes through 1 through hole on the vertical arms of the arm a and the arm d.
4. The device for simulating and teaching the shear test of the concrete test block as claimed in claim 2, wherein the independent telescopic adjusters are connected with an arm a and an arm b, the cross arm of the arm a is provided with insections, and the cross arm of the arm a and the independent telescopic adjusters form a member with functions of stopping and unlocking.
5. The concrete test block shear test simulation teaching device according to claim 4, wherein the independent telescopic regulator mainly comprises a block body, an unlocking switch, and a corrugated plate and an inclined plate which are positioned in the block body, a channel is arranged in the block body, the corrugated plate and the inclined plate are rectangular plates, one end of the corrugated plate is fixedly connected with the block body, the other end of the corrugated plate is fixedly connected with the inclined plate to form a V-shaped plate, one end of the inclined plate is connected with the corrugated plate and the unlocking switch, and the other end of the inclined plate is movably connected with the block body.
6. The simulation teaching device for the shear test of the concrete test block as claimed in claim 5, wherein the unlocking switch is in a U-shaped ring shape, and an elastic element is further arranged between the inclined plate and the block body.
7. The simulation teaching device for the shear test of the concrete test block as claimed in claim 1, wherein when n or m is equal to 1, the n-arm support or the m-arm support is a straight rod;
when n or m is greater than 1, the n-arm support or the m-arm support mainly comprises a cross rod, an upper vertical rod and n or m lower vertical rods, all the vertical rods are vertically connected with the cross rod, the upper vertical rod and the lower vertical rods are positioned on two sides of the cross rod, the upper vertical rod is connected with an upper pull head or a lower pull head, the lower vertical rod is connected with the square-shaped holder, and a telescopic regulator is arranged on a cross rod section between every two adjacent vertical rods.
8. The device for simulating and teaching the shear test of the concrete test block as claimed in claim 7, wherein the lower vertical rod is connected with the square-shaped holder through a hinged joint.
9. The simulation teaching device for the shear test of the concrete test block as claimed in claim 1, wherein the displacement collecting device mainly comprises a detachable bracket, a laser displacement sensor and a detachable frosted baffle, the detachable bracket is connected with the n-arm bracket, the laser displacement sensor is mounted on the detachable bracket, and the detachable frosted baffle is connected with the m-arm bracket and used for receiving the laser emitted by the laser displacement sensor.
10. The device for simulating and teaching the shear test of the concrete test block as claimed in claim 9, further comprising a data analysis device, wherein the data analysis device is respectively connected with the laser displacement sensor and the universal tester.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910988178.4A CN110631927A (en) | 2019-10-17 | 2019-10-17 | Shear test simulation teaching device of concrete test block |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910988178.4A CN110631927A (en) | 2019-10-17 | 2019-10-17 | Shear test simulation teaching device of concrete test block |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113607572A (en) * | 2020-12-28 | 2021-11-05 | 江苏省建筑工程质量检测中心有限公司 | Channel body shear strength mechanical test tool and application thereof |
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| CN105716968A (en) * | 2016-04-05 | 2016-06-29 | 沈阳铸锻工业有限公司 | Round rod specimen shearing device |
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