CN114486500A - Concrete creep test device suitable for various stress combinations and test method thereof - Google Patents
Concrete creep test device suitable for various stress combinations and test method thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 94
- 239000004567 concrete Substances 0.000 title claims abstract description 92
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 65
- 239000010959 steel Substances 0.000 claims abstract description 65
- 238000007906 compression Methods 0.000 claims abstract description 33
- 230000006835 compression Effects 0.000 claims abstract description 32
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 claims abstract description 11
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 6
- 239000011384 asphalt concrete Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000011394 gypsum concrete Substances 0.000 claims description 3
- 239000004574 high-performance concrete Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000002986 polymer concrete Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 3
- 239000000872 buffer Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 230000032258 transport Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
Abstract
The invention discloses a concrete creep test device suitable for various stress combinations and a test method thereof, which realize the transmission of stress from a sawtooth steel block to the concrete test piece by designing the periphery of the concrete test piece and one side of a plurality of sawtooth steel blocks into a sawtooth shape which can be occluded, provide the end fixing condition for a loading rod system by respectively fixing a bolt and a connecting piece in the middle of two surfaces of the sawtooth steel block, realize the composite loading of a plurality of stresses such as tensile stress, compressive stress, shear stress and the like by the combined loading of a horizontal loading rod system, a vertical loading rod system and an oblique loading rod system, realize the long-term maintenance of creep load by the combination of a plurality of loading rods, loading sleeves, springs and tension and compression sensors, eliminate the introduction of non-test loads such as friction resistance and the like by placing the test device on a plurality of freely rolling rollers, the whole test device can be prefabricated in a factory according to the design, the device can be used after being transported to a laboratory for installation, and is convenient to install and simple to manufacture.
Description
Technical Field
The invention belongs to the technical field of concrete structures, and particularly relates to a concrete creep test device suitable for various stress combinations and a test method thereof.
Background
The concrete structure generates long-term deformation during service due to creep characteristics, for example, the creep problem is serious in a large-span concrete beam structure, particularly a continuous beam bridge, the deformation is continuously increased after the bridge is built, and finally the mid-span deflection of the bridge is overlarge and the risk of collapse is caused. The existing concrete creep research is mainly aimed at a uniaxial stress state, in fact, stress at any point in a concrete structure can be formed by superposition of three normal stresses and three shear stresses, and creep caused by the shear stress is usually not negligible. The scholars calculate the shear creep deflection of the box girder by analyzing the influence rule of the shear deformation on the deflection of the box girder, and the calculation shows that the shear creep is one of the reasons for causing the continuous downwarping of the box girder.
In summary, a concrete creep model established by only relying on the axial compressive creep theory is difficult to consider the influence of shear creep, the creep development and long-term deformation of concrete in a composite stress state cannot be described faithfully, and the development of concrete creep test researches with different stress combinations is urgently needed.
Disclosure of Invention
In view of the above, the present invention is directed to a concrete creep test apparatus and a test method thereof suitable for various stress combinations, so as to solve the problems mentioned in the background art. The device can be used for carrying out concrete creep tests with different stress combinations, thereby providing test data support and reference for the concrete creep theory in a composite stress state.
In order to achieve the purpose, the invention adopts the following technical scheme: a test method for concrete creep suitable for various stress combinations specifically comprises the following steps:
(1) manufacturing a test device: designing the sizes of the components of a plurality of sawtooth steel blocks, a plurality of bolts, a plurality of connecting pieces, a plurality of loading rods, a plurality of loading sleeves, a plurality of springs, a plurality of tension and compression sensors, a plurality of rolling shafts and a base steel plate according to a test, finishing the manufacture in a factory, and assembling after transporting to a test site;
(2) manufacturing a concrete sample: determining the bottom shape of the concrete sample according to the shape of an area surrounded by the plurality of sawtooth steel blocks, determining the thickness of the concrete sample according to the thickness of the sawtooth steel blocks, and manufacturing and curing the concrete sample to reach the design strength;
(3) installing a test piece: the method comprises the following steps that a plurality of sawtooth steel blocks are arranged on the periphery of a concrete test piece according to a sawtooth shape, a bolt is fixed in the middle of each sawtooth steel block, a square matrix consisting of a plurality of bolts is formed on the periphery of the test piece, every two bolts on opposite sides and adjacent sides are connected through a loading rod system which forms an included angle of 0 degree, 45 degrees and 90 degrees with the horizontal plane, each loading rod system consists of a plurality of loading rods, a loading sleeve, a spring and a tension and compression sensor, and two ends of each loading rod system are fixedly connected with the bolts through connecting pieces;
(4) repeating the processes to complete the device installation of the two sides of the concrete sample; the whole device is arranged on a plurality of rolling shafts which are arranged on a base steel plate;
(5) load application and continuous compensation: the loading sleeve applies load according to the designed torque, and the value of the tension and compression sensor is observed to finish load maintenance; and checking the values of the tension and compression sensors at intervals, and if the load is reduced, replenishing the load by twisting the loading sleeve in time so as to continuously keep the load until the test is finished.
The test device adopted by the test method for the concrete creep suitable for various stress combinations comprises a plurality of sawtooth steel blocks, a plurality of bolts, a plurality of connecting pieces, a plurality of loading rods, a plurality of loading sleeves, a plurality of springs, a plurality of tension and compression sensors, a plurality of rolling shafts and a base steel plate,
the periphery of a concrete sample is placed according to a sawtooth shape by a plurality of sawtooth steel blocks, a bolt is fixed in the middle of each sawtooth steel block, every two bolts on opposite and adjacent sides are connected through a loading rod system which forms an included angle of 0 degree, 45 degrees and 90 degrees with the horizontal plane, each loading rod system consists of a plurality of loading rods, a loading sleeve, a spring and a tension and compression sensor, two ends of the loading rod system are fixedly connected with the bolts through connecting pieces, the whole device is placed on a plurality of rolling shafts, and the plurality of rolling shafts are located on a base steel plate.
Furthermore, the concrete of the concrete test piece is cement concrete, asphalt concrete, gypsum concrete, polymer concrete, high-performance concrete, recycled concrete and fiber concrete.
Furthermore, the periphery of the concrete test piece is provided with sawteeth, the sawteeth steel block is meshed with the sawteeth on the side of the concrete test piece, the angle formed by the short side of each sawtooth and the horizontal line is 45 degrees, the sawteeth are in the shape of an isosceles right triangle, and the length of the short side of each isosceles right triangle is not less than 10 mm.
Furthermore, the joints of the bolt, the connecting piece, the loading rod, the loading sleeve, the spring and the tension and compression sensor are all processed by tapping or threading processes, so that the reliable connection is ensured, and the installation and the disassembly are convenient.
Furthermore, the length and the connector position of the bolt and the connecting piece are determined according to the number of the connected loading rods, and a gap which is not less than 3mm is reserved between different loading rods, so that mutual influence is avoided.
Furthermore, a loading rod system is formed by sequentially connecting a loading rod, a loading sleeve, another loading rod, a tension and compression sensor, another loading rod, a spring and the last loading rod, tension and compression are applied by twisting the loading sleeve, and a load value is displayed by the tension and compression sensor.
Furthermore, the loading rod systems arranged on the two surfaces of the concrete sample are completely symmetrical.
Furthermore, the number of the rollers is not less than 3, and the length of each roller is not less than 1.5 times of the thickness of the sawtooth steel block.
Furthermore, the upper surface of the base steel plate is kept horizontal, the length of the base steel plate is not less than 2 times of the length of the concrete sample, and the width of the base steel plate is not less than the length of the roller.
Compared with the prior art, the creep load testing device has the advantages that the horizontal loading rod system, the vertical loading rod system and the oblique loading rod system are jointly loaded to realize the composite loading of various stresses such as tensile stress, compressive stress, shear stress and the like, the long-term maintenance of creep load is realized through the combination of the loading rods, the loading sleeves, the springs and the tension and compression sensors, and the introduction of non-test loads such as friction resistance and the like is eliminated by placing the testing device on the freely rolling rollers. In summary, the creep test device has the following advantages:
(1) the stress mechanism is clear. The concrete test piece is basically the same as a stress sketch of Material mechanics, has two normal stresses and two shear stresses, can directly calculate the loads applied by different loading rod systems according to the required stress combination, has a simple and clear force transmission path, and effectively reduces the difficulty of test design.
(2) The loading of various stress combinations can be realized. Horizontal tensile stress or compressive stress can be applied to the test piece through the horizontal loading rod system, vertical tensile stress or compressive stress can be applied to the test piece through the vertical loading rod system, shear stress can be applied to the test piece through the loading rod system with an included angle of 45 degrees with the horizontal plane, and the combined loading of the multiple loading rod systems can realize the composite application of various stresses such as tensile stress, compressive stress, shear stress and the like.
(3) The long-term maintenance of creep load is realized. The test loading device is mainly characterized in that a plurality of loading rods apply tension or pressure to a test piece through the torsion screw threads of the loading sleeve, and the load is timely supplemented through observing the tension-compression sensor through the change of the load in the spring buffer test, so that the creep load is kept for a long time.
(4) The introduction of non-test loads such as friction force and the like is avoided. The test device is placed on the plurality of rolling shafts, and the rolling shafts which roll freely effectively eliminate the introduction of non-test loads such as friction resistance and the like, so that the concrete test piece is only subjected to normal stress and shear stress transmitted by the sawtooth steel block, and the accuracy of the stress state is ensured.
(5) Simple structure, convenient installation, adjustment and replacement. Whole test device is whole to be become by steel members such as steel block, screw rod, connecting piece, loading sleeve, spring, roller bearing, backing plate, can prefabricate in the mill according to the design, transports to the installation of laboratory and can use, mainly adopts mechanical connection modes such as screw thread to installation, regulation and change are convenient for.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic perspective view of a concrete creep test apparatus according to the present invention, which is suitable for various stress combinations;
FIG. 2 is a front view of a concrete creep test apparatus according to the present invention adapted for various stress combinations;
FIG. 3 is a side view of a concrete creep test apparatus according to the present invention adapted for use with various combinations of stresses;
FIG. 4 is a front view of a simplified version of a concrete creep test apparatus according to the present invention adapted for use with a plurality of stress combinations;
FIG. 5 is a front view of another simplified version of a concrete creep test apparatus according to the present invention adapted for use with a plurality of stress combinations;
description of the figure code: 1-concrete test piece; 2-a sawtooth steel block; 3-a bolt; 4-a connector; 5-a loading rod; 6-a loading sleeve; 7-a spring; 8-a tension and compression sensor; 9-a roller; 10-base steel plate.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
Referring to fig. 1-5 to illustrate the embodiment, a concrete creep test device suitable for various stress combinations comprises a plurality of sawtooth steel blocks 2, a plurality of bolts 3, a plurality of connecting pieces 4, a plurality of loading rods 5, a plurality of loading sleeves 6, a plurality of springs 7, a plurality of tension and compression sensors 8, a plurality of rolling shafts 9 and a base steel plate 10,
the concrete sample 1 is placed with a plurality of sawtooth steel blocks 2 around according to the sawtooth shape, every sawtooth steel block 2 middle part is fixed a bolt 3, relative and adjacent limit's bolt 3 link to each other through the loading rod system that personally submits 0 degree, 45 degrees and 90 degrees contained angles with the level, every loading rod system comprises a plurality of loading rods 5, a loading sleeve 6, a spring 7 and a pressure sensor 8, the loading rod system both ends are connected fixedly through connecting piece 4 and bolt 3, whole device is arranged in on a plurality of roller bearings 9, a plurality of roller bearings 9 are located on the base steel sheet 10.
The concrete of the concrete sample 1 is cement concrete, asphalt concrete, gypsum concrete, polymer concrete, high-performance concrete, recycled concrete and fiber concrete.
Concrete sample 1 is provided with the sawtooth all around, the sawtooth meshing on sawtooth steel block 2 and the concrete sample 1 edge, the angle that the sawtooth minor face formed with the water flat line is 45 degrees, and the sawtooth shape is isosceles right triangle-shaped, and isosceles right triangle-shaped minor face length is no less than 10 mm.
The joints of the bolt 3, the connecting piece 4, the loading rod 5, the loading sleeve 6, the spring 7 and the tension and compression sensor 8 are all processed by tapping or threading processes, so that reliable connection is ensured, and the installation and the disassembly are convenient.
The length and the interface position are determined by the bolts 3 and the connecting pieces 4 according to the number of the connected loading rods 5, and gaps not less than 3mm are reserved between different loading rods 5 to avoid mutual influence.
The loading rod system is formed by sequentially connecting one loading rod 5, one loading sleeve 6, the other loading rod 5, a tension and compression sensor 8, the other loading rod 5, a spring 7 and the last loading rod 5, the tension and compression are applied by twisting the loading sleeve 6, and the load value is displayed by the tension and compression sensor 8.
The loading rod systems arranged on the two surfaces of the concrete sample 1 are completely symmetrical, so that asymmetrical loading is avoided.
The number of the rolling shafts 9 is not less than 3, and the length of each rolling shaft 9 is not less than 1.5 times of the thickness of the saw-tooth steel block 2.
The base steel plate 10 keeps the upper surface horizontal, the length of the base steel plate is not less than 2 times of the length of the concrete sample 1, and the width of the base steel plate is not less than the length of the rolling shaft 9.
The working principle of the concrete creep test device suitable for various stress combinations is as follows:
the invention realizes the transmission of stress from the sawtooth steel block 2 to the concrete test piece 1 by designing the sawtooth shape which can be occluded at the periphery of the concrete test piece 1 and one side of a plurality of sawtooth steel blocks 2, provides the end fixing condition for the loading rod system by respectively fixing a bolt 3 and a connecting piece 4 at the middle parts of two surfaces of the sawtooth steel blocks, realizes the composite loading of a plurality of stresses such as tensile stress, compressive stress, shearing stress and the like by arranging a loading rod system which forms an included angle of 0 degree, 45 degrees and 90 degrees with the horizontal plane between every two bolts at opposite sides and adjacent sides, leads a plurality of loading rods 5 to apply tensile force or pressure to the test piece by twisting screw threads through a loading sleeve 6, buffers the load change in the test by designing a spring 7, and supplements the load in time by observing a tension and compression sensor 8, thereby realizing the long-term maintenance of creep load, and being capable of carrying out the concrete creep test of different stress combinations, and test data support and reference are provided for the creep theory of the concrete in a composite stress state.
The invention realizes the composite loading of various stresses such as tensile stress, compressive stress, shear stress and the like by the combined loading of a horizontal loading rod system (the horizontal plane is at 0 degree), a vertical loading rod system (the horizontal plane is at 90 degrees) and an oblique loading rod system (the horizontal plane is at 45 degrees), the combination of a plurality of loading rods 5, loading sleeves 6, springs 7 and tension and compression sensors 8 is used for realizing the long-term maintenance of creep load, the test device is placed on a plurality of freely rolling rollers 9 to eliminate the introduction of non-test loads such as friction resistance and the like, the whole test device is composed of steel components such as a saw-shaped steel block 2, a screw rod 3, a connecting piece 4, a loading sleeve 6, a spring 7, the rollers 9, a base steel plate 10 and the like, the device can be prefabricated in a factory according to design, can be used after being transported to a laboratory for installation, and is mainly in mechanical connection modes such as screw threads and the like, so that the device is convenient to manufacture, install, adjust and replace.
A test method for concrete creep suitable for various stress combinations specifically comprises the following steps:
(1) manufacturing a test device: designing the sizes of all components of a plurality of sawtooth steel blocks 2, a plurality of bolts 3, a plurality of connecting pieces 4, a plurality of loading rods 5, a plurality of loading sleeves 6, a plurality of springs 7, a plurality of tension and compression sensors 8, a plurality of rolling shafts 9 and a base steel plate 10 according to a test, finishing the manufacture in a factory, and assembling after transporting to a test site;
(2) manufacturing a concrete sample: determining the bottom shape of the concrete sample (1) according to the shape of the area surrounded by the plurality of sawtooth steel blocks 2, determining the thickness of the concrete sample (1) according to the thickness of the sawtooth steel blocks 2, and manufacturing and curing a concrete sample 3 to reach the design strength;
(3) installing a test piece: the method comprises the following steps that a plurality of sawtooth steel blocks 2 are arranged on the periphery of a concrete test piece 1 according to a sawtooth shape, a bolt 3 is fixed in the middle of each sawtooth steel block 2, a square matrix formed by the bolts 3 is formed on the periphery of the test piece, every two bolts 3 on opposite sides and adjacent sides are connected through a loading rod system which forms an included angle of 0 degree, 45 degrees and 90 degrees with the horizontal plane, each loading rod system consists of a plurality of loading rods 5, a loading sleeve 6, a spring 7 and a tension and compression sensor 8, and two ends of each loading rod system are fixedly connected with the bolts 3 through connecting pieces 4;
(4) repeating the processes to complete the installation of the devices on the two sides of the concrete sample 1; the whole device is arranged on a plurality of rollers 9, and the plurality of rollers 9 are arranged on a base steel plate 10;
(5) load application and continuous compensation: the loading sleeve 6 applies load according to the designed torque, and the value of the tension and compression sensor 8 is observed to finish load maintenance; and checking the values of the tension and compression sensors 8 at intervals, and if the load is reduced, timely supplementing the load by twisting the loading sleeve 6 so as to continuously maintain the load until the test is finished.
The embodiments of the invention disclosed above are intended merely to aid in the explanation of the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention.
Claims (10)
1. A test method for concrete creep suitable for various stress combinations is characterized by comprising the following steps: the method specifically comprises the following steps:
(1) manufacturing a test device: designing the sizes of all components of a plurality of sawtooth steel blocks (2), a plurality of bolts (3), a plurality of connecting pieces (4), a plurality of loading rods (5), a plurality of loading sleeves (6), a plurality of springs (7), a plurality of tension and compression sensors (8), a plurality of rolling shafts (9) and a base steel plate (10) according to a test, finishing the manufacture in a factory, and assembling after transporting to a test site;
(2) manufacturing a concrete sample: determining the bottom shape of the concrete sample (1) according to the shape of an area surrounded by the plurality of sawtooth steel blocks (2), determining the thickness of the concrete sample (1) according to the thickness of the sawtooth steel blocks (2), and manufacturing and curing the concrete sample (3) to reach the design strength;
(3) installing a test piece: the method comprises the following steps that a plurality of sawtooth steel blocks (2) are arranged on the periphery of a concrete test piece (1) according to a sawtooth shape, a bolt (3) is fixed in the middle of each sawtooth steel block (2), a square matrix formed by the bolts (3) is formed on the periphery of the test piece, every two bolts (3) on opposite sides and adjacent sides are connected through a loading rod system which forms an included angle of 0 degree, 45 degrees and 90 degrees with the horizontal plane, each loading rod system comprises a plurality of loading rods (5), a loading sleeve (6), a spring (7) and a tension and compression sensor (8), and two ends of each loading rod system are fixedly connected with the bolts (3) through connecting pieces (4);
(4) repeating the processes to complete the installation of the devices on the two sides of the concrete sample (1); the whole device is arranged on a plurality of rolling shafts (9), and the plurality of rolling shafts (9) are arranged on a base steel plate (10);
(5) load application and continuous compensation: the loading sleeve (6) applies a load according to the designed torque, and the value of the tension and compression sensor (8) is observed to finish load holding; and checking the numerical value of the tension and compression sensor (8) at intervals, and if the load is reduced, replenishing the load in time through twisting the loading sleeve (6) to continuously keep the load until the test is finished.
2. A test apparatus for testing concrete creep according to claim 1 adapted for multiple stress combinations, comprising: comprises a plurality of sawtooth steel blocks (2), a plurality of bolts (3), a plurality of connecting pieces (4), a plurality of loading rods (5), a plurality of loading sleeves (6), a plurality of springs (7), a plurality of tension and compression sensors (8), a plurality of rolling shafts (9) and a base steel plate (10),
concrete sample (1) is placed according to the sawtooth shape with a plurality of sawtooth steel blocks (2) all around, bolt (3) of every sawtooth steel block (2) middle part fixed, relative and bolt (3) on adjacent limit are two liang between personally submit 0 degree with the level, 45 degrees and the load bar system of 90 degrees contained angles link to each other, every load bar system is by a plurality of load bars (5), a loading sleeve (6), a spring (7) and one draw and press sensor (8) to constitute, load bar system both ends are passed through connecting piece (4) and are connected fixedly with bolt (3), whole device is arranged in on a plurality of roller bearings (9), a plurality of roller bearings (9) are located on base steel sheet (10).
3. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: the concrete of the concrete test piece (1) is cement concrete, asphalt concrete, gypsum concrete, polymer concrete, high-performance concrete, recycled concrete and fiber concrete.
4. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: the concrete test piece (1) is provided with the sawtooth all around, sawtooth steel block (2) and the sawtooth meshing on concrete test piece (1) edge, the sawtooth shape is isosceles right triangle, and isosceles right triangle minor face length is no less than 10 mm.
5. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: the connection parts of the bolt (3), the connecting piece (4), the loading rod (5), the loading sleeve (6), the spring (7) and the tension and compression sensor (8) are all processed by tapping or threading processes, so that reliable connection is ensured, and the installation and the disassembly are convenient.
6. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: the length and the interface position of the bolt (3) and the connecting piece (4) are determined according to the number of the connected loading rods (5), and a gap not less than 3mm is reserved between different loading rods (5) to avoid mutual influence.
7. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: the loading rod system is formed by sequentially connecting one loading rod (5), one loading sleeve (6), another loading rod (5), a tension and compression sensor (8), another loading rod (5), a spring (7) and the last loading rod (5), tension and pressure are applied by twisting the loading sleeve (6), and a load numerical value is displayed by the tension and compression sensor (8).
8. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: and the loading rod systems arranged on the two surfaces of the concrete sample (1) are completely symmetrical.
9. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: the number of the rolling shafts (9) is not less than 3, and the length of each rolling shaft (9) is not less than 1.5 times of the thickness of the sawtooth steel block (2).
10. The test apparatus for concrete creep test method according to claim 2, wherein the test apparatus comprises: the upper surface of the base steel plate (10) is kept horizontal, the length of the base steel plate is not less than 2 times of the length of the concrete test piece (1), and the width of the base steel plate is not less than the length of the rolling shaft (9).
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