CN111948131B - Test device and test method for testing bonding strength of reinforced concrete - Google Patents
Test device and test method for testing bonding strength of reinforced concrete Download PDFInfo
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- CN111948131B CN111948131B CN202010761869.3A CN202010761869A CN111948131B CN 111948131 B CN111948131 B CN 111948131B CN 202010761869 A CN202010761869 A CN 202010761869A CN 111948131 B CN111948131 B CN 111948131B
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 158
- 238000012360 testing method Methods 0.000 title claims abstract description 125
- 238000010998 test method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 120
- 239000010959 steel Substances 0.000 claims description 120
- 238000003825 pressing Methods 0.000 claims description 63
- 238000001514 detection method Methods 0.000 claims description 27
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 11
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention provides a test device and a test method for testing the bonding strength of reinforced concrete, wherein the device comprises: the top of the structural base is connected with a structural top plate through a plurality of upper connecting pieces; the pushing method comprises the following steps: a fixed structure base; placing a reinforced concrete sample; placing a pressure sensor; placing an electronic dial indicator; establishing a connection through a signal processor; push-out loading is realized; the drawing method comprises the following steps: a fixed structure base; placing a reinforced concrete sample; assembling a structural top plate and arranging a servo actuator; placing an electronic dial indicator; establishing a connection through a signal processor; and carrying out drawing loading. The device has a simple structure, and can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby being beneficial to accurately testing the bearing capacity of the reinforced concrete; the method has the advantages of simple process and accurate and reliable result, can accurately test the bearing capacity of the reinforced concrete, is convenient for engineering application, and can provide theoretical basis for engineering design and construction.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a test device and a test method for testing the bonding strength of reinforced concrete.
Background
In the process of designing, constructing and using a reinforced concrete structure, the bearing capacity of the reinforced concrete structure cannot meet the requirement of safe use due to various uncertain factors, and in the reinforced concrete structure, mutual adhesion between the reinforced concrete and the concrete is the key of combined action of the reinforced concrete structure and the reinforced concrete structure, namely, the adhesion between the reinforced concrete and the concrete enables the two materials to fully exert the respective advantages, so that the bearing capacity of the reinforced concrete structure is established. The test device in the prior art has complicated structure and complex operation, and can not effectively meet the test requirement on the bonding strength of the reinforced concrete, so that the bearing capacity of the reinforced concrete can not be accurately tested, and theoretical basis can not be provided for engineering design and construction.
Disclosure of Invention
Aiming at some problems existing in the prior art, the invention provides a test device and a test method for testing the bonding strength of reinforced concrete, the device has a simple structure, and can effectively meet the test requirement on the bonding strength of reinforced concrete, thereby being beneficial to accurately testing the bearing capacity of the reinforced concrete; the method has the advantages of simple process and accurate and reliable result, can accurately test the bearing capacity of the reinforced concrete, is convenient for engineering application, and can provide theoretical basis for engineering design and construction.
In order to achieve the above object, the present invention provides a test device for testing the bonding strength of reinforced concrete, comprising a structural base, an upper connector and a lower connector;
The structure base extends vertically and comprises a vertical support, a base top plate fixedly connected to the top of the vertical support and a base bottom plate fixedly connected to the bottom of the vertical support; the vertical support piece comprises two middle long rib plates which are oppositely arranged, two middle short rib plates which are oppositely arranged and two pairs of outer side rib plates which are respectively positioned at the outer sides of the two middle long rib plates, wherein the two middle short rib plates are fixedly connected between the two middle long rib plates, and the two pairs of outer side rib plates are respectively fixedly connected at the outer sides of the two middle long rib plates; the center of the base top plate is provided with a circular slot hole B, and part of the edge of the base top plate is provided with a plurality of U-shaped slot holes B uniformly in the circumferential direction; a plurality of circular slotted holes C are uniformly formed in the periphery of the part, close to the edge, of the base bottom plate;
The number of the lower connecting pieces is a plurality of, and the number of the lower connecting pieces is consistent with that of the circular slotted holes C; the upper end of the lower connecting piece is inserted into the circular slotted hole C;
the number of the upper connecting pieces is multiple, the number of the upper connecting pieces is consistent with that of the U-shaped groove holes b, and the lower ends of the upper connecting pieces are inserted into the U-shaped groove holes b.
The device simple structure, low in manufacturing cost can effectively satisfy the test demand to reinforced concrete bonding strength to help accurate test reinforced concrete's bearing capacity.
Further, in order to guarantee the stability of test device, still include the test platform base, the test platform base sets up in the below of structure base, is provided with a plurality of circular through-holes on the test platform base, and a plurality of circular through-holes and a plurality of circular slotted hole C one-to-one's setting, the lower extreme of a plurality of lower part connecting pieces cartridge respectively in a plurality of circular through-holes to with test platform base and base bottom plate fixed connection.
Furthermore, in order to synchronously record data in real time when the push-out test is performed, the device also comprises a reinforced concrete sample, a pressure sensor, a threaded upper pressing plate, a threaded lower pressing plate, a servo actuator, a thin steel sheet A, a universal support frame, an electronic dial indicator, a signal processor and a computer;
the part of the vertical support corresponding to the circular slotted hole B is of a hollow structure;
The reinforced concrete sample is a reinforced concrete sample to be tested, is in a cube shape, is embedded with steel bars at the middle part, extends to the outer parts of two opposite end surfaces of the reinforced concrete sample, is exposed with short-section steel bars at the outer part of one side of the reinforced concrete sample, and is exposed with long-section steel bars at the outer part of the other side of the reinforced concrete sample; the reinforced concrete sample is arranged above the top plate of the base, and the long section of reinforcing steel bar penetrates through the circular slotted hole B and stretches into the cavity of the vertical support;
The pressure sensor is a hollow type force transducer, and the upper end and the lower end of the inner cavity of the pressure sensor are both provided with internal thread structures; the lower end of the threaded upper pressing plate and the upper end of the threaded lower pressing plate are fixedly connected with studs, and are connected with the upper end and the lower end of the pressure sensor through the studs to form a pressure detection mechanism; the pressure detection mechanism is arranged above the reinforced concrete sample, and the lower end face of the threaded lower pressing plate is in contact with the upper end of the short section of steel bar;
The servo actuator is fixedly supported above the pressure detection mechanism, and the telescopic end of the servo actuator is downward and fixedly connected with the upper end surface of the threaded upper pressing plate;
the thin steel sheet A is horizontally arranged, one end of the thin steel sheet A is bonded on the side surface of the threaded lower pressing plate in a bonding mode, and the other end of the thin steel sheet A extends to the outer side of the reinforced concrete sample;
The base of the universal support frame is fixedly connected to the upper end face of the base top plate, the electronic dial indicator is arranged on the upper part of the universal support frame, and the lower end of the measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet A;
the computer is connected with the electronic dial indicator and the pressure sensor respectively through the signal processor, and is also connected with the servo actuator.
The invention has simple structure and low manufacturing cost, can conveniently carry out push-out test of reinforced concrete samples, can conveniently record test data, can accurately test the bearing capacity of reinforced concrete, and can provide theoretical basis for engineering design and construction.
Further, for the convenience of carrying out the drawing test, still include the structure roof, the structure roof sets up in the top of structure base, and circular slotted hole A has been seted up to its center, and a plurality of U-shaped slotted holes a have been seted up to the partial circumference on border evenly, and circular slotted hole A and the corresponding setting of circular slotted hole B, the corresponding setting of a plurality of U-shaped slotted holes a and a plurality of U-shaped slotted holes B.
Furthermore, in order to synchronously record data in real time during a drawing test, the device also comprises a reinforced concrete sample, a pressure sensor, a perforated lower pressing plate, a perforated upper pressing plate, a servo actuator, a thin steel sheet B, a universal support frame, an electronic dial indicator, a signal processor and a computer;
the part of the vertical support corresponding to the circular slotted hole B is of a hollow structure;
The reinforced concrete sample is a reinforced concrete sample to be tested, is in a cube shape, is embedded with steel bars at the middle part, extends to the outer parts of two opposite end surfaces of the reinforced concrete sample, is exposed with short-section steel bars at the outer part of one side of the reinforced concrete sample, and is exposed with long-section steel bars at the outer part of the other side of the reinforced concrete sample; the reinforced concrete sample is arranged between the base top plate and the structural top plate, a gap is reserved between the lower end of the short-length steel bar and the upper end surface of the base top plate, and the upper end of the long-length steel bar penetrates out from the circular slotted hole A to the upper side of the structural top plate;
The pressure sensor is a hollow type force transducer; the centers of the perforated upper pressing plate and the perforated lower pressing plate are respectively provided with a through hole and coaxially arranged at the upper end and the lower end of the pressure sensor respectively to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete sample and the structural top plate and sleeved outside the long section of steel bar through the hollow cavity;
the servo actuator is fixedly supported above the structural top plate, and the telescopic end of the servo actuator is downward and fixedly connected with the upper end of the long section of steel bar;
The thin steel sheet B is horizontally arranged, one end of the thin steel sheet B is bonded on the end face of a short section of steel bar of the reinforced concrete sample in a bonding mode, and the other end of the thin steel sheet B horizontally extends to the outer side of the reinforced concrete sample;
The base of the universal support frame is fixedly connected to the upper end face of the base top plate, the electronic dial indicator is arranged on the upper part of the universal support frame, and the lower end of the measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet B;
the computer is connected with the electronic dial indicator and the pressure sensor respectively through the signal processor, and is also connected with the servo actuator.
The invention has simple structure and low manufacturing cost, can conveniently carry out the drawing test of the reinforced concrete sample, can conveniently record test data, can accurately test the bearing capacity of the reinforced concrete, and can provide theoretical basis for engineering design and construction.
Furthermore, in order to facilitate the assembly of the test device and the disassembly of the test device, the upper connecting piece consists of an upper connecting piece screw rod, a plurality of upper connecting piece nuts respectively connected with the upper end and the lower end of the upper connecting piece screw rod and a plurality of upper connecting piece gaskets respectively sleeved on the upper end and the lower end of the upper connecting piece screw rod;
The lower connecting piece comprises a lower connecting piece bolt, a plurality of lower connecting piece nuts connected to the lower part of the lower connecting piece bolt and a plurality of lower connecting piece gaskets respectively sleeved on the lower part of the lower connecting piece bolt.
Preferably, the base top plate and the base bottom plate are square, the number of the U-shaped groove holes b is four, and the U-shaped groove holes b are respectively arranged in the middle of four sides of the base top plate.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, which utilizes a test device for testing the bonding strength of the reinforced concrete to carry out push-out test and specifically comprises the following steps:
step one: a fixed structure base;
fixedly connecting the structural base with the test platform base through a lower connecting piece;
step two: placing a reinforced concrete sample;
A long section of steel bar of the reinforced concrete sample passes through the circular slotted hole B of the base top plate and is placed on the base top plate;
step three: placing a pressure sensor;
The method comprises the steps of respectively connecting a threaded lower pressing plate and a threaded upper pressing plate with the upper end and the lower end of an inner cavity of a pressure sensor in a threaded fit mode to form a pressure detection mechanism, connecting the threaded upper pressing plate in the pressure detection mechanism with a servo actuator fixedly supported above the pressure detection mechanism, and enabling the lower end face of the threaded lower pressing plate to be in contact with the upper end of a short-section steel bar of a reinforced concrete sample through a computer adjusting the servo actuator;
Step four: placing an electronic dial indicator;
Horizontally arranging the thin steel sheet A, and bonding one end of the thin steel sheet A with the side surface of the threaded lower pressing plate through structural adhesive; combining an electronic dial indicator with a universal supporting frame, and placing the universal supporting frame on the upper end face of a base top plate so that the lower end of a measuring rod of the electronic dial indicator contacts with the upper end face of the thin steel sheet A;
step five: establishing a connection through a signal processor;
Connecting the pressure sensor and the electronic dial indicator with the signal processor through a wire, and connecting the signal processor and the servo actuator with a computer through a wire;
Step six: push-out loading is realized;
the servo actuator is controlled by a computer to apply pressure downwards, the pressure is gradually increased, the pressure detection mechanism is driven to press the upper end of the short-length steel bar, and the pressure value acquired by the pressure sensor and the reading of the electronic dial indicator are recorded in real time by the computer.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing theoretical basis for engineering design and construction.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, which uses a test device for testing the bonding strength of the reinforced concrete to carry out a drawing test and specifically comprises the following steps:
step one: a fixed structure base;
fixedly connecting the structural base with the test platform base through a lower connecting piece;
step two: placing a reinforced concrete sample;
Setting a short section of steel bar of the reinforced concrete sample towards a top plate of the base; placing a perforated lower pressing plate on the surface of the reinforced concrete sample by penetrating the long section of steel bar of the reinforced concrete sample, and placing a pressure sensor on the perforated lower pressing plate by penetrating the long section of steel bar of the reinforced concrete sample; placing a perforated upper pressing plate on the pressure sensor through a long section of reinforced steel bar of the reinforced concrete sample;
Step three: assembling a structural top plate and arranging a servo actuator;
The method comprises the steps of enabling a structural top plate to penetrate through a long section of steel bar of a reinforced concrete sample, establishing connection between the structural top plate and a structural base through an upper connecting piece, and enabling a certain distance to be reserved between the structural top plate and the upper end face of a perforated upper pressing plate; a servo actuator is fixedly supported above the structural top plate, the servo actuator is fixedly connected with the upper end of the long-section steel bar, the servo actuator is controlled by a computer to retract for a certain distance, the perforated upper pressing plate is tightly attached to the structural top plate, and meanwhile, a certain distance is ensured between the end face of the short-section steel bar (6-2) of the reinforced concrete sample and the upper end face of the base top plate;
Step four: placing an electronic dial indicator;
Horizontally arranging the thin steel sheet B, and bonding one end of the thin steel sheet B with the end face of a short section of steel bar of the reinforced concrete sample through structural adhesive; combining an electronic dial indicator with a universal supporting frame, and placing the universal supporting frame on the upper end face of a base top plate so that the lower end of a measuring rod of the electronic dial indicator contacts with the upper end face of the thin steel sheet A;
step five: establishing a connection through a signal processor;
Connecting the pressure sensor and the electronic dial indicator with the signal processor through a wire, and connecting the signal processor and the servo actuator with a computer through a wire;
Step six: carrying out drawing loading;
the servo actuator is controlled by a computer to draw the long steel bar upwards, the tension is gradually increased, and the tension value acquired by the pressure sensor and the reading of the electronic dial indicator are recorded in real time.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing theoretical basis for engineering design and construction.
Drawings
FIG. 1 is a schematic view of the assembly of a structural base and structural top plate of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic view of a structural ceiling of the present invention;
FIG. 4 is an exploded view of the structure of the structural base of the present invention;
FIG. 5 is a schematic view of a test apparatus according to the present invention;
FIG. 6 is an exploded view of FIG. 5 with the servo full actuator, signal processor and computer removed;
FIG. 7 is a schematic view of another test device according to the present invention;
FIG. 8 is an exploded view of FIG. 6 with the servo full actuator, signal processor and computer removed.
In the figure: 1. a structural base, 2, a structural top plate, 3, an upper connecting piece, 4, a lower connecting piece, 5, a test platform base, 6, a reinforced concrete sample, 7, a threaded lower pressing plate, 8, a threaded upper pressing plate, 9, a pressure sensor, 10, a thin steel sheet A,11, a universal support frame, 12, an electronic dial indicator, 13, a signal processor, 14, a computer, 15, a table, 16, a perforated lower pressing plate, 17, a perforated upper pressing plate, 18, a thin steel sheet B,19 and a servo actuator;
1-1, a base top plate, 1-2, a base bottom plate, 1-3, a middle short rib plate, 1-4, a middle long rib plate, 1-5, an outer rib plate, 1-6, a vertical support, 2-1, a circular slotted hole A,2-2, a U-shaped slotted hole a,3-1, an upper connecting piece screw, 3-2, an upper connecting piece nut, 3-3, an upper connecting piece gasket, 4-1, a lower connecting piece bolt, 4-2, a lower connecting piece nut, 4-3, an upper connecting piece gasket, 6-1, a long reinforcing bar, 6-2 and a short reinforcing bar;
1-1-1, a circular slot B,1-1-2, a U-shaped slot B,1-2-1 and a circular slot C.
Detailed Description
The invention is further described below with reference to fig. 1 to 8.
The invention provides a test device for testing the bonding strength of reinforced concrete, which comprises a structural base 1, an upper connecting piece 3 and a lower connecting piece 4;
The structure base 1 extends vertically and comprises a vertical support piece 1-6, a base top plate 1-1 fixedly connected to the top of the vertical support piece 1-6 and a base bottom plate 1-2 fixedly connected to the bottom of the vertical support piece 1-6; the vertical support piece 1-6 comprises two middle long rib plates 1-4 which are oppositely arranged, two middle short rib plates 1-3 which are oppositely arranged and two pairs of outer rib plates 1-5 which are respectively positioned at the outer sides of the two middle long rib plates 1-4, wherein the two middle short rib plates 1-3 are fixedly connected between the two middle long rib plates 1-4, and the two pairs of outer rib plates 1-5 are respectively fixedly connected at the outer sides of the two middle long rib plates 1-4; the center of the base top plate 1-1 is provided with a circular slotted hole B1-1-1, and part of the edge of the base top plate is provided with a plurality of U-shaped slotted holes B1-1-2 uniformly in the circumferential direction; a plurality of circular slotted holes C1-2-1 are uniformly formed in the periphery of the part, close to the edge, of the base bottom plate 1-2;
The number of the lower connecting pieces 4 is a plurality of, and the number of the lower connecting pieces is consistent with that of the circular slotted holes C1-2-1; the upper end of the lower connecting piece 4 is inserted into the circular slotted hole C1-2-1;
The number of the upper connecting pieces 3 is a plurality, and the number of the upper connecting pieces is consistent with that of the U-shaped slotted holes b1-1-2, and the lower ends of the upper connecting pieces 3 are inserted into the U-shaped slotted holes b 1-1-2.
The device simple structure, low in manufacturing cost can effectively satisfy the test demand to reinforced concrete bonding strength to help accurate test reinforced concrete's bearing capacity.
In order to ensure the stability of the test device, the test device further comprises a test platform base 5, wherein the test platform base 5 is arranged below the structural base 1, a plurality of circular through holes are formed in the test platform base 5, the circular through holes are in one-to-one correspondence with the circular slotted holes C1-2-1, the lower ends of the lower connecting pieces 4 are respectively inserted into the circular through holes, and the test platform base 5 is fixedly connected with the base bottom plate 1-2.
In order to synchronously record data in real time when a push-out test is performed, the device also comprises a reinforced concrete sample 6, a pressure sensor 9, a threaded upper pressing plate 8, a threaded lower pressing plate 7, a servo actuator 19, a thin steel sheet A10, a universal supporting frame 11, an electronic dial indicator 12, a signal processor 13 and a computer 14;
the part of the vertical support piece 1-6 corresponding to the circular slotted hole B1-1-1 is of a hollow structure;
The reinforced concrete sample 6 is a reinforced concrete sample to be tested, is in a cube shape, is embedded with steel bars in the middle, extends to the outer parts of two opposite end surfaces of the reinforced concrete sample 6, is exposed with a short-section steel bar 6-2 at the outer part of one side of the reinforced concrete sample 6, and is exposed with a long-section steel bar 6-1 at the outer part of the other side of the reinforced concrete sample 6; the reinforced concrete sample 6 is arranged above the base top plate 1-1, and the long section of reinforced steel bar 6-1 passes through the circular slotted hole B1-1-1 to extend into the cavity of the vertical support 1-6;
The pressure sensor 9 is a hollow type force transducer, and the upper end and the lower end of the inner cavity of the pressure sensor 9 are both provided with internal thread structures; studs are fixedly connected to the lower end of the threaded upper pressing plate 8 and the upper end of the threaded lower pressing plate 7, and are connected to the upper end and the lower end of the pressure sensor 9 through the studs to form a pressure detection mechanism; the pressure detection mechanism is arranged above the reinforced concrete sample 6, and the lower end face of the threaded lower pressing plate 7 is in contact with the upper end of the short-section steel bar 6-2;
the servo actuator 19 is fixedly supported above the pressure detection mechanism, and the telescopic end of the servo actuator is downward and fixedly connected with the upper end surface of the threaded upper pressing plate 8;
the thin steel sheet A10 is horizontally arranged, one end of the thin steel sheet A is bonded on the side surface of the threaded lower pressing plate 7 in a bonding way, and the other end of the thin steel sheet A extends to the outer side of the reinforced concrete sample 6;
The base of the universal support frame 11 is fixedly connected to the upper end face of the base top plate 1-1, the electronic dial indicator 12 is arranged on the upper part of the universal support frame 11, and the lower end of the measuring rod is in contact fit with the upper end face of the thin steel sheet A10;
The computer 14 is respectively connected with the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13, and is also connected with the servo actuator 19. Preferably, the computer 14 is disposed on a table 15.
The invention has simple structure and low manufacturing cost, can conveniently carry out push-out test of reinforced concrete samples, can conveniently record test data, can accurately test the bearing capacity of reinforced concrete, and can provide theoretical basis for engineering design and construction.
In order to facilitate the drawing test, the drawing test device further comprises a structural top plate 2, wherein the structural top plate 2 is arranged above the structural base 1, a circular slot A2-1 is formed in the center of the structural top plate, a plurality of U-shaped slots A2-2 are uniformly formed in the periphery of the edge of the structural top plate, the circular slot A2-1 is arranged corresponding to the circular slot B1-1-1, and a plurality of U-shaped slots A2-2 are arranged corresponding to the U-shaped slots B1-1-2.
In order to synchronously record data in real time when a drawing test is performed, the device also comprises a reinforced concrete sample 6, a pressure sensor 9, a perforated lower pressing plate 16, a perforated upper pressing plate 17, a servo actuator 19, a thin steel sheet B18, a universal supporting frame 11, an electronic dial indicator 12, a signal processor 13 and a computer 14;
the part of the vertical support piece 1-6 corresponding to the circular slotted hole B1-1-1 is of a hollow structure;
The reinforced concrete sample 6 is a reinforced concrete sample to be tested, is in a cube shape, is embedded with steel bars in the middle, extends to the outer parts of two opposite end surfaces of the reinforced concrete sample 6, is exposed with a short-section steel bar 6-2 at the outer part of one side of the reinforced concrete sample 6, and is exposed with a long-section steel bar 6-1 at the outer part of the other side of the reinforced concrete sample 6; the reinforced concrete sample 6 is arranged between the base top plate 1-1 and the structural top plate 2, a gap is reserved between the lower end of the short-length reinforced bar 6-2 and the upper end surface of the base top plate 1-1, and the upper end of the long-length reinforced bar 6-1 penetrates out from the circular slotted hole A2-1 to the upper side of the structural top plate 2;
The pressure sensor 9 is a hollow type force transducer; the centers of the perforated upper pressing plate 17 and the perforated lower pressing plate 16 are respectively provided with a through hole, and are coaxially arranged at the upper end and the lower end of the pressure sensor 9 respectively to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete sample 6 and the structural roof 2, and is sleeved outside the long section of steel bar 6-1 through a cavity;
the servo actuator 19 is fixedly supported above the structural top plate 2, and the telescopic end of the servo actuator is downward and fixedly connected with the upper end of the long steel bar 6-1;
The thin steel sheet B18 is horizontally arranged, one end of the thin steel sheet B18 is bonded on the end face of the short section steel bar 6-2 of the reinforced concrete sample 6 in a bonding mode, and the other end of the thin steel sheet B horizontally extends to the outer side of the reinforced concrete sample 6;
the base of the universal support frame 11 is fixedly connected to the upper end face of the base top plate 1-1, the electronic dial indicator 12 is arranged on the upper part of the universal support frame 11, and the lower end of the measuring rod is in contact fit with the upper end face of the thin steel sheet B18;
The computer 14 is respectively connected with the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13, and is also connected with the servo actuator 19. Preferably, the computer 14 is disposed on a table 15.
The invention has simple structure and low manufacturing cost, can conveniently carry out the drawing test of the reinforced concrete sample, can conveniently record test data, can accurately test the bearing capacity of the reinforced concrete, and can provide theoretical basis for engineering design and construction.
In order to facilitate the assembly of the test device and the disassembly of the test device, the upper connecting piece 3 consists of an upper connecting piece screw rod 3-1, a plurality of upper connecting piece nuts 3-2 respectively connected with the upper end and the lower end of the upper connecting piece screw rod 3-1 and a plurality of upper connecting piece gaskets 3-3 respectively sleeved with the upper end and the lower end of the upper connecting piece screw rod 3-1;
The lower connector 4 is composed of a lower connector bolt 4-1, a plurality of lower connector nuts 4-2 connected to the lower part of the lower connector bolt 4-1, and a plurality of lower connector gaskets 4-3 respectively sleeved on the lower part of the lower connector bolt 4-1.
Preferably, the base top plate 1-1 and the base bottom plate 1-2 are square, the number of the U-shaped slotted holes b1-1-2 is four, and the U-shaped slotted holes b1-1-2 are respectively arranged in the middle of four sides of the base top plate 1-1.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, which utilizes a test device for testing the bonding strength of the reinforced concrete to carry out push-out test and specifically comprises the following steps:
Step one: a fixed structure base 1;
the structure base 1 is fixedly connected with the test platform base 5 through the lower connecting piece 4;
Step two: placing a reinforced concrete sample 6;
A long section of steel bar 6-1 of a reinforced concrete sample 6 passes through a circular slotted hole B1-1-1 of a base top plate 1-1 and is placed on the base top plate 1-1;
step three: placing a pressure sensor 9;
The method comprises the steps of connecting a threaded lower pressing plate 7 and a threaded upper pressing plate 8 with the upper end and the lower end of an inner cavity of a pressure sensor 9 respectively in a threaded fit mode to form a pressure detection mechanism, connecting the threaded upper pressing plate 8 in the pressure detection mechanism with a servo actuator 19 fixedly supported above the pressure detection mechanism, and adjusting the servo actuator 19 through a computer 14 to enable the lower end face of the threaded lower pressing plate 7 to be in contact with the upper end of a short-section steel bar 6-2 of a reinforced concrete sample 6;
Step four: placing an electronic dial gauge 12;
Arranging the thin steel sheet A10 horizontally, and bonding one end of the thin steel sheet A with the side surface of the threaded lower pressing plate 7 through structural adhesive; combining an electronic dial indicator 12 with the universal supporting frame 11, and placing the universal supporting frame 11 on the upper end face of the base top plate 1-1 to enable the lower end of a measuring rod of the electronic dial indicator 12 to be in contact with the upper end face of the thin steel sheet A10;
Step five: establishing a connection by means of the signal processor 13;
the pressure sensor 9 and the electronic dial indicator 12 are connected with the signal processor 12 through wires, and the signal processor 12 and the servo actuator 19 are connected with the computer 14 through wires;
Step six: push-out loading is realized;
The servo actuator 19 is controlled by the computer 14 to apply pressure downwards and gradually increase the pressure, the pressure detection mechanism is driven to press the upper end of the short-length steel bar 6-2 downwards, and the pressure value acquired by the pressure sensor 9 and the reading of the electronic dial indicator 12 are recorded in real time by the computer 14.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing theoretical basis for engineering design and construction.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, which uses a test device for testing the bonding strength of the reinforced concrete to carry out a drawing test and specifically comprises the following steps:
Step one: a fixed structure base 1;
the structure base 1 is fixedly connected with the test platform base 5 through the lower connecting piece 4;
Step two: placing a reinforced concrete sample 6;
Setting short-section steel bars 6-2 of a reinforced concrete sample 6 towards a base top plate 1-1; placing the perforated lower pressure plate 16 on the surface of the concrete sample 6 through the long length of the steel bar 6-1 of the reinforced concrete sample 6, and placing the pressure sensor 9 on the perforated lower pressure plate 16 through the long length of the steel bar 6-1 of the reinforced concrete sample 6; placing a perforated upper pressing plate 17 on the pressure sensor 9 through the long section of steel bar 6-1 of the reinforced concrete sample 6;
step three: assembling a structural top plate 2 and arranging a servo actuator 19;
The structural top plate 2 passes through a long section of steel bar 6-1 of a reinforced concrete sample 6, the connection between the structural top plate 2 and the structural base 1 is established through an upper connecting piece 3, and a certain distance is reserved between the structural top plate 2 and the upper end face of a perforated upper pressing plate 17; a servo actuator 19 is fixedly supported above the structural top plate 2, the servo actuator 19 is fixedly connected with the upper end of the long-length steel bar 6-1, the servo actuator 19 is controlled by a computer 14 to retract for a certain distance, the perforated upper pressing plate 17 is tightly attached to the structural top plate 2, and a certain distance is ensured between the end face of the short-length steel bar 6-2 of the reinforced concrete sample 6 and the upper end face of the base top plate 1-1;
Step four: placing an electronic dial gauge 12;
Horizontally arranging a thin steel sheet B18, and bonding one end of the thin steel sheet B with the end face of the short section steel bar 6-2 of the reinforced concrete sample 6 through structural adhesive; combining an electronic dial indicator 12 with the universal supporting frame 11, and placing the universal supporting frame 11 on the upper end face of the base top plate 1-1 to enable the lower end of a measuring rod of the electronic dial indicator 12 to be in contact with the upper end face of the thin steel sheet A10;
Step five: establishing a connection by means of the signal processor 13;
the pressure sensor 9 and the electronic dial indicator 12 are connected with the signal processor 12 through wires, and the signal processor 12 and the servo actuator 19 are connected with the computer 14 through wires;
Step six: carrying out drawing loading;
the servo actuator 19 is controlled by the computer 14 to pull the long steel bar 6-1 upwards, the tension is gradually increased, and the tension value acquired by the pressure sensor 9 and the reading of the electronic dial indicator 12 are recorded in real time by the computer 14.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing theoretical basis for engineering design and construction.
Claims (7)
1. The test device for testing the bonding strength of the reinforced concrete comprises a structural base (1) and is characterized by further comprising an upper connecting piece (3) and a lower connecting piece (4);
The structure base (1) extends vertically and comprises a vertical support (1-6), a base top plate (1-1) fixedly connected to the top of the vertical support (1-6) and a base bottom plate (1-2) fixedly connected to the bottom of the vertical support (1-6); the part of the vertical support piece (1-6) corresponding to the circular slotted hole B (1-1-1) is of a hollow structure; the vertical support piece (1-6) comprises two middle long rib plates (1-4) which are oppositely arranged, two middle short rib plates (1-3) which are oppositely arranged and two pairs of outer rib plates (1-5) which are respectively positioned at the outer sides of the two middle long rib plates (1-4), the two middle short rib plates (1-3) are fixedly connected between the two middle long rib plates (1-4), and the two pairs of outer rib plates (1-5) are respectively fixedly connected at the outer sides of the two middle long rib plates (1-4); the center of the base top plate (1-1) is provided with a circular slotted hole B (1-1-1), and part of the edge of the base top plate is provided with a plurality of U-shaped slotted holes B (1-1-2) uniformly in the circumferential direction; a plurality of circular slotted holes C (1-2-1) are uniformly formed in the periphery of the part, close to the edge, of the base bottom plate (1-2);
The number of the lower connecting pieces (4) is a plurality of, and the number of the lower connecting pieces is consistent with that of the circular slotted holes C (1-2-1); the upper end of the lower connecting piece (4) is inserted into the circular slotted hole C (1-2-1);
the number of the upper connecting pieces (3) is a plurality, and the number of the upper connecting pieces is consistent with that of the U-shaped slotted holes b (1-1-2), and the lower ends of the upper connecting pieces (3) are inserted into the U-shaped slotted holes b (1-1-2);
The test platform comprises a base (1) and is characterized by further comprising a test platform base (5), wherein the test platform base (5) is arranged below the structural base (1), a plurality of circular through holes are formed in the test platform base (5), the circular through holes are arranged in a one-to-one correspondence with the circular slotted holes C (1-2-1), the lower ends of the lower connecting pieces (4) are respectively inserted into the circular through holes, and the test platform base (5) is fixedly connected with a base bottom plate (1-2);
the upper connecting piece (3) consists of an upper connecting piece screw rod (3-1), a plurality of upper connecting piece nuts (3-2) respectively connected with the upper end and the lower end of the upper connecting piece screw rod (3-1) and a plurality of upper connecting piece gaskets (3-3) respectively sleeved on the upper end and the lower end of the upper connecting piece screw rod (3-1);
The lower connecting piece (4) consists of a lower connecting piece bolt (4-1), a plurality of lower connecting piece nuts (4-2) connected to the lower part of the lower connecting piece bolt (4-1) and a plurality of lower connecting piece gaskets (4-3) respectively sleeved on the lower part of the lower connecting piece bolt (4-1);
the reinforced concrete sample (6) is a reinforced concrete sample to be tested, is in a cube shape, is embedded with steel bars in the middle, extends to the outer parts of two opposite end surfaces of the reinforced concrete sample (6), is exposed with a short-section steel bar (6-2) at the outer part of one side of the reinforced concrete sample (6), and is exposed with a long-section steel bar (6-1) at the outer part of the other side of the reinforced concrete sample (6); the reinforced concrete sample (6) is arranged above the base top plate (1-1), and the long section of steel bar (6-1) passes through the circular slotted hole B (1-1-1) to extend into the cavity of the vertical support (1-6).
2. The test device for testing the bonding strength of the reinforced concrete according to claim 1, further comprising a reinforced concrete sample (6), a pressure sensor (9), a threaded upper pressing plate (8), a threaded lower pressing plate (7), a servo actuator (19), a thin steel sheet A (10), a universal support frame (11), an electronic dial indicator (12), a signal processor (13) and a computer (14);
The pressure sensor (9) is a hollow type force transducer, and the upper end and the lower end of the inner cavity of the pressure sensor (9) are both provided with internal thread structures; the lower end of the threaded upper pressing plate (8) and the upper end of the threaded lower pressing plate (7) are fixedly connected with studs, and are connected with the upper end and the lower end of the pressure sensor (9) through the studs to form a pressure detection mechanism; the pressure detection mechanism is arranged above the reinforced concrete sample (6), and the lower end face of the threaded lower pressing plate (7) is in contact with the upper end of the short-section steel bar (6-2);
The servo actuator (19) is fixedly supported above the pressure detection mechanism, and the telescopic end of the servo actuator is downward and fixedly connected with the upper end surface of the threaded upper pressing plate (8);
The thin steel sheet A (10) is horizontally arranged, one end of the thin steel sheet A is bonded on the side surface of the threaded lower pressing plate (7) in a bonding mode, and the other end of the thin steel sheet A extends to the outer side of the reinforced concrete sample (6);
The base of the universal support frame (11) is fixedly connected to the upper end face of the base top plate (1-1), the electronic dial indicator (12) is arranged on the upper part of the universal support frame (11), and the lower end of the measuring rod is in contact fit with the upper end face of the thin steel sheet A (10);
The computer (14) is respectively connected with the electronic dial indicator (12) and the pressure sensor (9) through the signal processor (13), and is also connected with the servo actuator (19).
3. The test device for testing the bonding strength of the reinforced concrete comprises a structural base (1) and is characterized by further comprising an upper connecting piece (3) and a lower connecting piece (4);
The structure base (1) extends vertically and comprises a vertical support (1-6), a base top plate (1-1) fixedly connected to the top of the vertical support (1-6) and a base bottom plate (1-2) fixedly connected to the bottom of the vertical support (1-6); the part of the vertical support piece (1-6) corresponding to the circular slotted hole B (1-1-1) is of a hollow structure; the vertical support piece (1-6) comprises two middle long rib plates (1-4) which are oppositely arranged, two middle short rib plates (1-3) which are oppositely arranged and two pairs of outer rib plates (1-5) which are respectively positioned at the outer sides of the two middle long rib plates (1-4), the two middle short rib plates (1-3) are fixedly connected between the two middle long rib plates (1-4), and the two pairs of outer rib plates (1-5) are respectively fixedly connected at the outer sides of the two middle long rib plates (1-4); the center of the base top plate (1-1) is provided with a circular slotted hole B (1-1-1), and part of the edge of the base top plate is provided with a plurality of U-shaped slotted holes B (1-1-2) uniformly in the circumferential direction; a plurality of circular slotted holes C (1-2-1) are uniformly formed in the periphery of the part, close to the edge, of the base bottom plate (1-2);
The number of the lower connecting pieces (4) is a plurality of, and the number of the lower connecting pieces is consistent with that of the circular slotted holes C (1-2-1); the upper end of the lower connecting piece (4) is inserted into the circular slotted hole C (1-2-1);
the number of the upper connecting pieces (3) is a plurality, and the number of the upper connecting pieces is consistent with that of the U-shaped slotted holes b (1-1-2), and the lower ends of the upper connecting pieces (3) are inserted into the U-shaped slotted holes b (1-1-2);
The test platform comprises a base (1) and is characterized by further comprising a test platform base (5), wherein the test platform base (5) is arranged below the structural base (1), a plurality of circular through holes are formed in the test platform base (5), the circular through holes are arranged in a one-to-one correspondence with the circular slotted holes C (1-2-1), the lower ends of the lower connecting pieces (4) are respectively inserted into the circular through holes, and the test platform base (5) is fixedly connected with a base bottom plate (1-2);
The structure comprises a structure base (1), and is characterized by further comprising a structure top plate (2), wherein the structure top plate (2) is arranged above the structure base (1), a circular slot hole A (2-1) is formed in the center of the structure top plate, a plurality of U-shaped slot holes a (2-2) are uniformly formed in the periphery of the edge of the structure top plate, the circular slot hole A (2-1) is arranged corresponding to the circular slot hole B (1-1-1), and a plurality of U-shaped slot holes a (2-2) are arranged corresponding to the U-shaped slot holes B (1-1-2);
the upper connecting piece (3) consists of an upper connecting piece screw rod (3-1), a plurality of upper connecting piece nuts (3-2) respectively connected with the upper end and the lower end of the upper connecting piece screw rod (3-1) and a plurality of upper connecting piece gaskets (3-3) respectively sleeved on the upper end and the lower end of the upper connecting piece screw rod (3-1);
The lower connecting piece (4) consists of a lower connecting piece bolt (4-1), a plurality of lower connecting piece nuts (4-2) connected to the lower part of the lower connecting piece bolt (4-1) and a plurality of lower connecting piece gaskets (4-3) respectively sleeved on the lower part of the lower connecting piece bolt (4-1);
The reinforced concrete sample (6) is a reinforced concrete sample to be tested, is in a cube shape, is embedded with steel bars in the middle, extends to the outer parts of two opposite end surfaces of the reinforced concrete sample (6), is exposed with a short-section steel bar (6-2) at the outer part of one side of the reinforced concrete sample (6), and is exposed with a long-section steel bar (6-1) at the outer part of the other side of the reinforced concrete sample (6); the reinforced concrete sample (6) is arranged between the base top plate (1-1) and the structure top plate (2), a gap is reserved between the lower end of the short-length reinforcing steel bar (6-2) and the upper end face of the base top plate (1-1), and the upper end of the long-length reinforcing steel bar (6-1) penetrates out of the upper portion of the structure top plate (2) through the circular slotted hole A (2-1).
4. A test device for testing the bonding strength of reinforced concrete according to claim 3, further comprising a reinforced concrete sample (6), a pressure sensor (9), a perforated lower pressure plate (16), a perforated upper pressure plate (17), a servo actuator (19), a thin steel sheet B (18), a universal support frame (11), an electronic dial indicator (12), a signal processor (13) and a computer (14);
the pressure sensor (9) is a hollow type force transducer; the centers of the perforated upper pressing plate (17) and the perforated lower pressing plate (16) are respectively provided with a through hole, and the through holes are coaxially arranged at the upper end and the lower end of the pressure sensor (9) respectively to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete sample (6) and the structural roof (2) and sleeved outside the long section of steel bar (6-1) through the hollow cavity;
The servo actuator (19) is fixedly supported above the structural top plate (2), and the telescopic end of the servo actuator is downward and fixedly connected with the upper end of the long steel bar (6-1);
the thin steel sheet B (18) is horizontally arranged, one end of the thin steel sheet B is bonded on the end face of the short section steel bar (6-2) of the reinforced concrete sample (6) in a bonding mode, and the other end of the thin steel sheet B horizontally extends to the outer side of the reinforced concrete sample (6);
The base of the universal support frame (11) is fixedly connected to the upper end face of the base top plate (1-1), the electronic dial indicator (12) is arranged on the upper part of the universal support frame (11), and the lower end of the measuring rod is in contact fit with the upper end face of the thin steel sheet B (18);
The computer (14) is respectively connected with the electronic dial indicator (12) and the pressure sensor (9) through the signal processor (13), and is also connected with the servo actuator (19).
5. A test device for testing the bonding strength of reinforced concrete according to claim 1 or 3, wherein the base top plate (1-1) and the base bottom plate (1-2) are square, the number of the U-shaped slots b (1-1-2) is four, and the U-shaped slots b are respectively arranged in the middle of four sides of the base top plate (1-1).
6. A test method for testing the bonding strength of reinforced concrete, characterized in that a push-out test is performed by using a test apparatus for testing the bonding strength of reinforced concrete according to claim 2, comprising the steps of:
step one: a fixed structure base (1);
the structural base (1) is fixedly connected with the test platform base (5) through the lower connecting piece (4);
step two: placing a reinforced concrete sample (6);
a long section of steel bar (6-1) of a reinforced concrete sample (6) passes through a circular slotted hole B (1-1-1) of a base top plate (1-1) and is placed on the base top plate (1-1);
step three: placing a pressure sensor (9);
the method comprises the steps that a threaded lower pressing plate (7) and a threaded upper pressing plate (8) are respectively connected with the upper end and the lower end of an inner cavity of a pressure sensor (9) in a threaded fit mode to form a pressure detection mechanism, the threaded upper pressing plate (8) in the pressure detection mechanism is connected with a servo actuator (19) fixedly supported above the pressure detection mechanism, and the servo actuator (19) is adjusted through a computer (14) to enable the lower end face of the threaded lower pressing plate (7) to be in contact with the upper end of a short-section steel bar (6-2) of a reinforced concrete sample (6);
step four: placing an electronic dial indicator (12);
Arranging the thin steel sheet A (10) horizontally, and bonding one end of the thin steel sheet A with the side surface of the threaded lower pressing plate (7) through structural adhesive; combining an electronic dial indicator (12) with a universal supporting frame (11), and placing the universal supporting frame (11) on the upper end face of a base top plate (1-1) to enable the lower end of a measuring rod of the electronic dial indicator (12) to be in contact with the upper end face of a thin steel sheet A (10);
Step five: establishing a connection by means of a signal processor (13);
The pressure sensor (9) and the electronic dial indicator (12) are connected with the signal processor (13) through wires, and the signal processor (13) and the servo actuator (19) are connected with the computer (14) through wires;
Step six: push-out loading is realized;
The servo actuator (19) is controlled by the computer (14) to apply pressure downwards and gradually increase the pressure, the pressure detection mechanism is driven to press the upper end of the short-section steel bar (6-2), and the pressure value acquired by the pressure sensor (9) and the reading of the electronic dial indicator (12) are recorded in real time by the computer (14).
7. A test method for testing the bonding strength of reinforced concrete, characterized in that a pull test is performed by using a test apparatus for testing the bonding strength of reinforced concrete according to claim 4, comprising the steps of:
step one: a fixed structure base (1);
the structural base (1) is fixedly connected with the test platform base (5) through the lower connecting piece (4);
step two: placing a reinforced concrete sample (6);
Setting short-length steel bars (6-2) of a reinforced concrete sample (6) towards a base top plate (1-1); placing a perforated lower pressing plate (16) on the surface of the concrete sample (6) through a long-length steel bar (6-1) of the reinforced concrete sample (6), and placing a pressure sensor (9) on the perforated lower pressing plate (16) through the long-length steel bar (6-1) of the reinforced concrete sample (6); placing a perforated upper pressing plate (17) on the pressure sensor (9) through a long length of steel bar (6-1) of the reinforced concrete sample (6);
step three: the assembly structure top plate (2) is provided with a servo actuator (19);
The method comprises the steps of enabling a structural top plate (2) to penetrate through a long section of steel bar (6-1) of a reinforced concrete sample (6), establishing connection between the structural top plate (2) and a structural base (1) through an upper connecting piece (3), and enabling a certain distance to be reserved between the structural top plate (2) and the upper end face of a perforated upper pressing plate (17); a servo actuator (19) is fixedly supported above the structural top plate (2), the servo actuator (19) is fixedly connected with the upper end of the long-section steel bar (6-1), the servo actuator (19) is controlled by a computer (14) to retract for a certain distance, the perforated upper pressing plate (17) is tightly attached to the structural top plate (2), and meanwhile, a certain distance is ensured between the end face of the short-section steel bar (6-2) of the reinforced concrete sample (6) and the upper end face of the base top plate (1-1);
step four: placing an electronic dial indicator (12);
Horizontally arranging a thin steel sheet B (18), and bonding one end of the thin steel sheet B with the end surface of a short section of steel bar (6-2) of a reinforced concrete sample (6) through structural adhesive; combining an electronic dial indicator (12) with a universal supporting frame (11), and placing the universal supporting frame (11) on the upper end face of a base top plate (1-1) to enable the lower end of a measuring rod of the electronic dial indicator (12) to be in contact with the upper end face of a thin steel sheet A (10);
Step five: establishing a connection by means of a signal processor (13);
The pressure sensor (9) and the electronic dial indicator (12) are connected with the signal processor (13) through wires, and the signal processor (13) and the servo actuator (19) are connected with the computer (14) through wires;
Step six: carrying out drawing loading;
the servo actuator (19) is controlled by the computer (14) to draw the long steel bar (6-1) upwards, the tension is gradually increased, and the tension value acquired by the pressure sensor (9) and the reading of the electronic dial indicator (12) are recorded in real time by the computer (14).
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| CN202010761869.3A CN111948131B (en) | 2020-07-31 | 2020-07-31 | Test device and test method for testing bonding strength of reinforced concrete |
| AU2020101793A AU2020101793A4 (en) | 2020-07-31 | 2020-08-13 | Test device for testing bond strength of reinforced concrete |
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| CN113092213B (en) * | 2021-04-25 | 2023-06-30 | 西藏农牧学院 | Triaxial sample batch manufacturing device and method capable of performing dry-wet circulation |
| CN114018806A (en) * | 2021-10-14 | 2022-02-08 | 中山大学 | BFRP (bidirectional Forwarding resistance) bar and concrete dynamic bonding performance test system and test method |
| CN114062256A (en) * | 2021-11-29 | 2022-02-18 | 兰州交通大学 | Loading device and method for testing bonding performance of steel bar and concrete |
| CN114527067B (en) * | 2022-02-24 | 2023-11-10 | 山东省建筑工程质量检验检测中心有限公司 | Steel and concrete positive drawknot strength detection tool |
| CN114354361B (en) * | 2022-03-16 | 2022-05-20 | 潍坊昌大建设集团有限公司 | Steel bar connection strength detection device |
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| AU2020101793A4 (en) | 2020-09-17 |
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