CN119086279A - A concrete uniaxial strain high pressure mechanical properties testing device - Google Patents
A concrete uniaxial strain high pressure mechanical properties testing device Download PDFInfo
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- CN119086279A CN119086279A CN202411366556.2A CN202411366556A CN119086279A CN 119086279 A CN119086279 A CN 119086279A CN 202411366556 A CN202411366556 A CN 202411366556A CN 119086279 A CN119086279 A CN 119086279A
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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
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Abstract
The invention discloses a concrete uniaxial strain high-pressure mechanical property testing device, which relates to the field of concrete mechanical property testing, and comprises a combined steel pipe, a T-shaped pressure head, a plurality of displacement meters and strain gauges, wherein the combined steel pipe comprises a first steel pipe and a second steel pipe which are sleeved with each other, a sample loading channel for accommodating a concrete sample is formed in the first steel pipe, one end of the T-shaped pressure head is connected with a testing machine, the other end of the T-shaped pressure head enters the sample loading channel to be abutted against two ends of the concrete sample, the two T-shaped pressure heads move towards each other to form compressive load on the concrete sample under the driving of the testing machine, the second steel pipe is in interference fit with the outer periphery of the first steel pipe to form prestress, a plurality of strain gauges for testing lateral stress and lateral strain of the concrete are circumferentially arranged on the outer periphery of the second steel pipe, and the displacement meters are used for testing the axial deformation of the concrete by monitoring the interval variable between the two T-shaped pressure heads. The device can test the relation among axial stress, lateral stress and volume strain of the concrete in an approximately uniaxial strain state under load, and the test pressure range is greatly improved.
Description
Technical Field
The invention belongs to the field of concrete mechanical property testing, and particularly relates to a device for testing uniaxial strain high-pressure mechanical property of concrete.
Background
Concrete structures are exposed to the threat of high-speed impact and accidental explosions during service, and can be subjected to extreme loads exceeding 1GPa of hydrostatic pressure. The mechanical property of the concrete under high pressure is tested, and is important to evaluate the safety of the concrete structure under extreme load conditions. The uniaxial strain high-pressure mechanical property testing device adopts a thick-wall steel pipe to restrain a cylindrical concrete sample, so that the concrete sample is applied with lateral stress under axial loading and is approximately in a uniaxial strain state, and the axial stress, lateral stress and volume strain relation of the concrete sample under high-pressure load can be measured by using a common testing machine for loading. The key component in the apparatus is a thick-walled steel pipe that determines the maximum lateral stress that the test can apply to the concrete sample. In order to measure the mechanical properties of concrete under higher pressure, the restraining capacity of a thick-wall steel pipe must be improved, and the existing method is to increase the outer diameter/inner diameter ratio of the thick-wall steel pipe and improve the strength of the material of the thick-wall steel pipe. However, the method has reached the bottleneck, the reasonable ratio of the outer diameter to the inner diameter of the thick-wall steel pipe is about 3, the restraint capacity of the thick-wall steel pipe is not obviously improved by further increasing the ratio of the outer diameter to the inner diameter, and the processing cost and the experimental operation difficulty are obviously increased. In addition, the elastic limit of the existing ultra-high strength steel can reach 1700MPa, and further increasing the material strength is difficult to realize. This results in a relatively inadequate test capability of current concrete uniaxial strain high-pressure mechanical property test devices.
Aiming at the defects, the invention provides an improved concrete uniaxial strain high-pressure mechanical property testing device for meeting the requirement of impact and explosion resistance analysis of a concrete structure, which can obviously improve the maximum lateral stress applied to a concrete sample relative to the existing device and is used for solving the defect that the constraint capacity of the existing concrete uniaxial strain high-pressure mechanical property testing device is relatively insufficient.
Disclosure of Invention
The invention aims to provide a device for testing uniaxial strain high-pressure mechanical properties of concrete, which is used for solving the technical problems in the prior art.
The device for testing the uniaxial strain high-pressure mechanical properties of the concrete comprises a combined steel pipe, a plurality of strain gauges, T-shaped pressure heads and a plurality of displacement meters, wherein the strain gauges are arranged on the outer wall of the combined steel pipe, the T-shaped pressure heads are arranged at the two ends of the combined steel pipe, the displacement meters are connected between the two T-shaped pressure heads, the combined steel pipe comprises a first steel pipe and a second steel pipe which are sleeved with each other, a sample carrying channel for containing a concrete sample is formed in the first steel pipe, one end of the T-shaped pressure head is connected with a testing machine, the other end of the T-shaped pressure head enters the sample carrying channel to be abutted against the two ends of the concrete sample, the two T-shaped pressure heads move towards each other to form compressive load on the concrete sample under the driving of the testing machine, the second steel pipe is in interference fit with the outer peripheral side of the first steel pipe to form prestress, the outer Zhou Cehuan of the second steel pipe is provided with a plurality of strain gauges for testing lateral stress and lateral strain of the concrete sample, and the displacement meters are used for testing axial deformation of the concrete sample by monitoring distance variable between the two T-shaped pressure heads.
The structure aims to provide the device for testing the uniaxial strain high-pressure mechanical property of the concrete, which can test the relation among the axial stress, the lateral stress and the volume strain of the concrete sample in the approximately uniaxial strain state under the compression load of the testing machine, and compared with the prior scheme of adopting a prestressed steel pipe, the device for testing the uniaxial strain high-pressure mechanical property of the concrete can greatly improve the range of the high-pressure mechanical property of the concrete.
Preferably, the outer diameter of the second steel pipe is 3 times of the inner diameter of the first steel pipe, the ratio of the outer diameter of the first steel pipe (1) to the inner diameter of the second steel pipe (2) at the horizontal center position is the same, and the interference of the first steel pipe to the second steel pipe is 1% of the inner diameter of the first steel pipe.
Preferably, the outer diameter of the upper end of the first steel pipe (1) is 3 times larger than the outer diameter of the lower end of the first steel pipe (1), the outer diameter of the upper end of the first steel pipe (1) is linearly transited along the axial direction, the inner diameter of the upper end of the second steel pipe (2) is 3 times larger than the inner diameter of the lower end of the second steel pipe (2), and the inner diameter of the upper end of the second steel pipe (2) is linearly transited along the axial direction.
In the preferred scheme, the geometric dimensions of the first steel pipe and the second steel pipe are optimized, and the ratio of the inner diameter to the outer diameter of the combined steel pipe to the ratio of the inner diameter to the outer diameter of the first steel pipe to the ratio of the outer diameter of the second steel pipe to the ratio of the inner diameter to the ratio of the interference between the first steel pipe to the interference between the second steel pipe are specifically optimized, so that the lateral stress provided by the combined steel pipe to a concrete sample can be improved by 38% relative to the prestressed steel pipe with the same dimension. Meanwhile, the second steel pipe can be sleeved into the first steel pipe in a non-resistance manner within the height of 2/3 of the steel pipe, and the residual height of the second steel pipe can be sleeved into the first steel pipe by adopting a pressing method, so that the first steel pipe and the second steel pipe can be conveniently assembled into the prestressed steel pipe.
Preferably, the strain gauge is distributed with three layers along the axial direction of the second steel pipe, the middle layer and the horizontal center of the combined steel pipe are positioned on the same plane, 6 strain gauges are uniformly distributed on the middle layer in the circumferential direction, the height of the two layers of the upper and lower middle layers from the middle layer is 1/2 times of the height of the concrete sample, and 3 strain gauges are uniformly distributed on each layer in the circumferential direction. By arranging the strain gauges, the circumferential strain response of the outer wall of the steel pipe can be accurately measured, the circumferential strain difference of different heights of the outer wall of the steel pipe can be measured, the circumferential uniform strain of the outer wall of the steel pipe at the same height can be measured, and the influence of the size error of a concrete sample and the incompletely uniform vertical effect of the testing machine can be eliminated.
Preferably, the T-shaped pressure head comprises a large end and a small end, the small end is in clearance fit with the sample loading channel, and the outer diameter of the large end is larger than that of the small end. Wherein the small end with smaller cross section size is matched with the end face of the concrete sample, and the large end with larger cross section size is connected with the testing machine.
Preferably, the large end of the T-shaped pressure head is supported with the combined steel pipe through a spring. The spring connection can reduce the height difference between the horizontal center of the combined steel pipe and the horizontal center of the concrete sample during initial loading.
Preferably, the length of the small end of the T-shaped pressure head is 40% of the height of the concrete sample.
The maximum axial compressive stress of the T-shaped pressure head in the preferable scheme on the concrete sample is not lower than 1700MPa, the axial compressive strain of the T-shaped pressure head on the concrete sample can reach 30%, and the displacement meter bracket is convenient to fix.
Preferably, a plurality of displacement meter upper brackets are connected on the periphery side of the large end of the T-shaped pressure head at the upper end of the combined steel pipe in a circumferential manner, displacement meter lower brackets corresponding to the displacement meter upper brackets one by one are connected on the periphery side of the large end of the T-shaped pressure head at the lower end of the combined steel pipe, and the displacement meters are fixed between the displacement meter upper brackets and the displacement meter lower brackets.
Preferably, the displacement meters are uniformly distributed with 4 displacement meters along the circumferential direction of the combined steel pipe. The displacement meter can accurately measure the relative displacement between the upper T-shaped pressure head and the lower T-shaped pressure head in the loading process, the displacement measuring range is matched with the loading range of the T-shaped pressure head, and the displacement difference of different annular displacement positions can be measured, so that the vertical action uniformity can be conveniently evaluated, and the average displacement can be conveniently measured.
Preferably, the accuracy of the displacement meter reaches 0.001mm, and the measuring range is not less than 30% of the height of the concrete sample.
Compared with the prior art, the invention at least discloses the following beneficial effects:
In order to enhance the lateral pressure exerted by the steel pipe on concrete in the prior art, the design is only focused on two parameters of improving the strength of the steel pipe material and adjusting the ratio of the inner diameter to the outer diameter of the steel pipe, but the method is close to the efficiency limit. In the invention, a steel pipe for restraining concrete is innovatively designed, and a combined steel pipe consisting of a first steel pipe and a second steel pipe which are in interference fit is adopted. The design ensures that the steel pipe has prestress in an initial state, thereby more effectively utilizing the mechanical property of the steel pipe material on the premise of not changing the material strength of the steel pipe and not adjusting the inner diameter and outer diameter ratio of the steel pipe. By adopting the novel technical scheme, the steel pipe can provide lateral stress of up to 1250MPa for the concrete sample, and compared with 900MPa of the traditional prestressed steel pipe, the lateral stress is improved by nearly 38%, so that the testing device can measure the high-pressure chemical property of the concrete under the hydrostatic pressure of not lower than 1250 MPa.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is a side view of an embodiment of the present invention;
FIG. 3 is a top view of an embodiment of the present invention;
FIG. 4 is a front cross-sectional view of an embodiment of the present invention;
fig. 5 is a perspective exploded view of an embodiment of the present invention.
The device comprises a first steel pipe, a second steel pipe, a strain gauge, a T-shaped pressure head, a displacement meter upper bracket, a displacement meter lower bracket, a displacement meter, a spring, a concrete sample and bolts, wherein the first steel pipe, the second steel pipe, the strain gauge, the T-shaped pressure head, the displacement meter upper bracket, the displacement meter lower bracket, the displacement meter, the spring, the concrete sample and the bolts are respectively arranged in sequence, and the strain gauge is arranged in sequence.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1 to 5, the invention provides a device for testing uniaxial strain high-pressure mechanical properties of concrete, which comprises a combined steel pipe, a strain gauge 3, a T-shaped pressure head 4 and a displacement meter 7, wherein the device is connected with a testing machine and a data acquisition instrument, and under the cooperation of the testing machine and the data acquisition instrument, the compression test of a concrete sample 9 is completed, and measured test data are the compression load of the testing machine, the displacement of the displacement meter 7 and the strain of the strain gauge 3.
Specifically, the combined steel pipe comprises a first steel pipe 1 and a second steel pipe 2 which are sleeved with each other, the second steel pipe 2 is sleeved outside the first steel pipe 1, the outer diameter of the first steel pipe 1 is identical to the inner diameter of the second steel pipe 2, the interference exists, the first steel pipe and the second steel pipe are assembled to form the combined steel pipe, and initial prestress exists on the combined steel pipe, namely the outer wall of the first steel pipe 1 and the inner wall of the second steel pipe 2 are pressed. The inner diameter of the combined steel pipe is the same as the diameter of the cylindrical concrete sample 9, grease is smeared on the outer peripheral surface of the concrete sample 9 and is placed in the combined steel pipe, when the two axial ends of the concrete sample 9 are stressed, the combined steel pipe restrains the concrete sample 9 from laterally deforming, so that the concrete sample 9 is subjected to the lateral stress which is passively increased along with the axial loading force, and at the moment, the lateral strain of the concrete sample 9 is far smaller than the axial strain and is approximately in a uniaxial strain state.
According to a further optimization scheme, the first steel pipe 1 and the second steel pipe 2 are made of ultra-high strength steel with the elastic limit of not lower than 1700MPa after heat treatment.
According to a further optimization scheme, the outer diameter of the steel pipe II 2 is 3 times of the inner diameter of the steel pipe I1, the ratio of the outer diameter of the steel pipe I1 to the inner diameter of the steel pipe II 2 at the horizontal center position is the same, the interference of the outer diameter of the steel pipe I1 and the inner diameter of the steel pipe II 2 is 1% of the inner diameter of the steel pipe I1, namely the outer diameter of the steel pipe I1 is larger than the inner diameter of the steel pipe II 2, and the difference of the two is 1% of the inner diameter of the steel pipe I1.
In the optimization scheme, the material performance and the geometric dimension of the first steel pipe 1 and the second steel pipe 2 are optimized, the ratio of the inner diameter to the outer diameter of the combined steel pipe and the interference between the first steel pipe 1 and the second steel pipe 2 are specifically optimized, and the combined steel pipe can improve the lateral stress provided by the concrete sample 9 by 38% relative to the non-prestressed steel pipe with the same dimension.
According to the further optimization scheme, the heights of the steel pipe I1 and the steel pipe II 2 are the same and are 130% of the height of the concrete sample 9, and the height of the combined steel pipe is 30% higher than that of the concrete sample 9, so that the T-shaped pressure head 4 can be conveniently positioned.
According to a further optimization scheme, the outer diameter of the upper end of the first steel pipe 1 is 3 times larger than that of the lower end, the outer diameters of the other height positions are uniformly changed between the upper end and the lower end, namely the outer diameter is linearly transited from the upper end to the lower end along the axial direction, the inner diameter of the upper end of the second steel pipe 2 is 3 times larger than that of the lower end, and the inner diameters of the other height positions are uniformly changed between the upper end and the lower end, namely the inner diameter is linearly transited from the upper end to the lower end along the axial direction. The method has the advantages that the steel pipe II 2 can be sleeved into the steel pipe I1 in the height of 2/3 of the steel pipe, the residual height of the steel pipe II 2 can be sleeved into the steel pipe I1 by adopting a pressing method, and the steel pipe I1 and the steel pipe II 2 can be conveniently assembled into the prestressed steel pipe.
The strain gauge 3 is circumferentially arranged along the outer wall of the second steel pipe 2 to test the circumferential strain of the outer wall of the second steel pipe 2, and when the inner wall of the first steel pipe 1 is subjected to lateral stress, the lateral stress and the lateral strain of the inner wall of the first steel pipe 1, namely the lateral stress and the lateral strain of the concrete sample 9, can be calculated according to the measurement result of the strain gauge 3.
According to the further optimization scheme, 1 micro strain can be identified by the precision of the strain gauge 3, the strain gauge 3 is circumferentially arranged along the outer wall of the steel pipe II 2, three layers are totally arranged, the three layers are respectively located on different horizontal planes, the middle layer is located at the horizontal center of the combined steel pipe II, 6 strain gauges 3 are uniformly circumferentially distributed along the horizontal center of the steel pipe II 2, the other two layers are respectively located above and below the middle layer, and the distance between the strain gauges 3 and the horizontal center of the steel pipe II 2 is 1/2 times the height of the concrete sample 9, and 3 strain gauges 3 are uniformly circumferentially distributed on each layer. The method has the advantages that the circumferential strain response of the outer wall of the steel pipe can be accurately measured, the circumferential strain difference of the outer wall of the steel pipe at different heights can be measured, the circumferential uniform strain of the outer wall of the steel pipe at the same height can be measured, and the influence of the dimensional error of the concrete sample 9 and the incompletely uniform vertical effect of the testing machine can be eliminated.
The T-shaped pressure head 4 comprises an upper end and a lower end which are respectively arranged at the upper end and the lower end of the combined steel pipe and comprise a large end and a small end, wherein the small end with smaller cross section size is matched with the end face of the concrete sample 9, the large end with larger cross section size is connected with the testing machine, the T-shaped pressure head 4 is used for acting compression load of the testing machine on the end face of the concrete sample 9, the small end with smaller cross section of the T-shaped pressure head 4 is in clearance fit with the combined steel pipe, namely, the diameter of the small end of the T-shaped pressure head 4 is still smaller than the inner diameter of the combined steel pipe after axial loading deformation is considered, therefore, the T-shaped pressure head 4 and the combined steel pipe do not interact during loading, the side face of the T-shaped pressure head 4 is provided with a threaded hole, and the upper bracket 5 of the displacement meter and the lower bracket 6 of the displacement meter are respectively connected with the upper and lower T-shaped pressure head 4 through bolts 10. Two springs 8 are respectively arranged between the two T-shaped pressure heads 4 and the combined steel pipe, the springs 8 are sleeved on the periphery of the small end of the T-shaped pressure heads 4, one end of each spring 8 is abutted against the end face of the large end of the T-shaped pressure head 4, the other end is abutted against the end face of the combined steel pipe, and the position of the combined steel pipe can be kept at the middle position of the two T-shaped pressure heads 4 before the compression test starts. The spring 8 is connected to reduce the height difference between the horizontal center of the combined steel pipe and the horizontal center of the concrete sample 9 during initial loading.
According to the further optimization scheme, the T-shaped pressure heads 4 are symmetrically arranged up and down, and are made of the same material as the steel pipe I1 and the steel pipe II 2 and are made of ultra-high strength steel.
Further optimizing scheme, the length of the small end of the T-shaped pressure head 4 is 40% of the height of the concrete sample 9.
The maximum axial compressive stress of the T-shaped pressure head 4 with the structure on the concrete sample 9 is not lower than 1700MPa, the axial compressive strain of the concrete sample 9 can reach 30%, and the bracket of the displacement meter 7 is convenient to fix.
The displacement meter 7 is fixed between the upper displacement meter bracket 5 and the lower displacement meter bracket 6, is clamped by the upper displacement meter bracket 5 and is propped against by the lower displacement meter bracket 6. The displacement meter 7 can measure the vertical displacement between the upper bracket 5 and the lower bracket 6, and the axial displacement of the concrete sample 9 is obtained by subtracting the deformation of the T-shaped pressure head 4 from the displacement measured by the displacement meter 7.
Further optimizing scheme, displacement meter upper bracket 5 and displacement meter lower carriage 6 all are equipped with the screw hole that matches with T shape pressure head 4, still are equipped with the hole that can centre gripping displacement meter 7 on the displacement meter upper bracket 5, and displacement meter 7 precision reaches 0.001mm and the range is not less than 30% of concrete sample 9 height, 4 are arranged along T shape pressure head 4 hoop to displacement meter upper bracket 5, displacement meter lower carriage 6 and displacement meter 7. The device has the advantages that the relative displacement between the upper T-shaped pressure head 4 and the lower T-shaped pressure head 4 in the loading process can be accurately measured, the displacement measuring range is matched with the loading range of the T-shaped pressure head 4, the displacement difference of different annular positions can be measured, and the vertical action uniformity and the average displacement can be conveniently evaluated.
The concrete sample 9 can be made of concrete or mortar, rock, gypsum and the like with similar mechanical properties to the concrete, and is specifically determined according to actual test requirements.
It should be understood that in practical applications, the device needs to be used with a testing machine and a data acquisition instrument, where the testing machine should be a testing machine capable of applying and testing compressive load, and the data acquisition instrument should be capable of acquiring the compressive load of the testing machine, displacement of the displacement meter 7, and strain data of the strain gauge 3.
The working principle of the testing device is as follows:
The test device for testing the uniaxial strain high-pressure mechanical properties of the concrete is adopted, and is matched with a tester and a data acquisition instrument, so that the compression test is carried out on the concrete sample 9, the measured test data are the compression load of the tester, the displacement of the displacement meter 7 and the strain of the strain gauge 3, and the test purpose is to obtain the relationship among the axial stress, the lateral stress and the volume strain of the concrete sample 9 in an approximately uniaxial strain state. The concrete sample 9 is restrained by the combined steel pipe to be approximately in a uniaxial strain state, and after grease is smeared on the side surface of the concrete sample 9 to reduce friction with the inner wall of the steel pipe, the concrete sample 9 is subjected to approximately uniform lateral stress of the combined steel pipe. In the test, the combined steel pipe is always kept in an elastic stress state, the lateral stress of the inner wall of the combined steel pipe corresponds to the lateral stress of the horizontal center of the outer wall of the combined steel pipe one by one, and the relation between the lateral stress and the lateral stress can be solved by adopting a numerical simulation or theoretical analysis method, so that the lateral stress of the concrete sample 9 can be calculated from the strain test result of the strain gauge 3. At the same level, the lateral strain of the inner wall of the combined steel pipe and the lateral strain of the outer wall of the steel pipe are also in one-to-one correspondence, and can be solved by a numerical simulation or theoretical analysis method, so that the average lateral strain of the concrete sample 9 can be obtained by solving the test results of the strain gauges 3 with three different levels of the outer wall of the steel pipe 2. The axial stress of the concrete sample 9 can be calculated by taking the cross-sectional size of the concrete sample 9 and the compressive load of the tester into consideration the lateral strain of the concrete sample 9. And (3) the displacement test result of the displacement meter 7 is taken into consideration, after the deformation of the T-shaped pressure head 4, the axial strain of the concrete sample 9 can be calculated, and the lateral strain is further taken into consideration, so that the concrete volume strain can be obtained. In summary, the axial stress, lateral stress and volumetric strain relationship of the concrete sample 9 can be determined.
The present invention is not limited to the details of conventional techniques known to those skilled in the art.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. The device for testing the uniaxial strain high-pressure mechanical properties of the concrete is characterized by comprising a combined steel pipe, T-shaped pressure heads (4) positioned at two ends of the combined steel pipe and a plurality of displacement meters (7) connected between the two T-shaped pressure heads (4), wherein the combined steel pipe comprises a first steel pipe (1) and a second steel pipe (2) which are sleeved with each other, a sample loading channel for containing a concrete sample (9) is formed in the first steel pipe (1), one end of the T-shaped pressure head (4) is connected with a testing machine, the other end of the T-shaped pressure head enters the sample loading channel to be abutted against two ends of the concrete sample (9), the two T-shaped pressure heads (4) move towards each other to form a compression load on the concrete sample (9) under the driving of the testing machine, the outer periphery of the first steel pipe (1) is in interference fit with the second steel pipe (2) to form prestress, a plurality of strain gauges (3) for testing the lateral stress and the lateral strain of the concrete sample (9) are arranged in the direction, and the axial deformation of the concrete is tested by the two T-shaped pressure heads (4).
2. The concrete uniaxial strain high-pressure mechanical property testing device according to claim 1, wherein the outer diameter of the steel tube II (2) is 3 times of the inner diameter of the steel tube I (1), the ratio of the outer diameter of the steel tube in the horizontal center position of the steel tube I (1) to the inner diameter of the steel tube II (2) is the same, and the interference between the steel tube I (1) and the steel tube II (2) is 1% of the inner diameter of the steel tube I (1).
3. The device for testing the uniaxial strain high-pressure mechanical properties of the concrete according to claim 2, wherein the outer diameter of the upper end of the first steel tube (1) is 3 times larger than the outer diameter of the lower end of the first steel tube (1), the outer diameter of the upper end of the first steel tube (1) is linearly transited along the axial direction, the inner diameter of the upper end of the second steel tube (2) is 3 times larger than the inner diameter of the lower end of the second steel tube (2), and the inner diameter of the upper end of the second steel tube (2) is linearly transited along the axial direction.
4. The device for testing the uniaxial strain high-pressure mechanical properties of the concrete is characterized in that three layers of strain gauges (3) are distributed along the axial direction of the outer wall of a second steel pipe (2), a middle layer and the horizontal center of the combined steel pipe are located on the same plane, 6 strain gauges (3) are uniformly distributed in the circumferential direction of the middle layer, the height of two layers of concrete samples (9) which are located on the upper side and the lower side of the middle layer and are 1/2 times of the height of the middle layer from the middle layer is achieved, and 3 strain gauges (3) are uniformly distributed in the circumferential direction of each layer.
5. The device for testing the uniaxial strain high-pressure mechanical properties of concrete according to claim 1, wherein the T-shaped pressure head (4) comprises a large end and a small end, the small end is in clearance fit with the sample loading channel, and the outer diameter of the large end is larger than that of the small end.
6. The device for testing the uniaxial strain high-pressure mechanical properties of the concrete according to claim 5, wherein the large end of the T-shaped pressure head (4) and the combined steel pipe are supported by a spring (8).
7. The device for testing the uniaxial strain high-pressure mechanical properties of concrete according to claim 5, wherein the length of the small end of the T-shaped pressure head (4) is 40% of the height of the concrete sample (9).
8. The concrete uniaxial strain high-pressure mechanical property testing device according to claim 5, wherein a plurality of displacement meter upper brackets (5) are connected on the periphery side of the large end of the T-shaped pressure head (4) at the upper end of the combined steel pipe in a circumferential manner, displacement meter lower brackets (6) in one-to-one correspondence with the displacement meter upper brackets (5) are connected on the periphery side of the large end of the T-shaped pressure head (4) at the lower end of the combined steel pipe, and the displacement meter (7) is fixed on the displacement meter upper brackets (5) and abuts against the displacement meter lower brackets (6).
9. The concrete uniaxial strain high-pressure mechanical property testing device according to claim 8, wherein the displacement meters (7) are uniformly distributed with 4 displacement meters along the circumferential direction of the combined steel pipe.
10. The device for testing the uniaxial strain high-pressure mechanical properties of concrete according to claim 9, wherein the accuracy of the displacement meter (7) is up to 0.001mm and the measuring range is not less than 30% of the height of the concrete sample (9).
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| CN119086279B CN119086279B (en) | 2025-03-21 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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