CN114383929B - Concrete stress-strain testing device - Google Patents
Concrete stress-strain testing device Download PDFInfo
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- CN114383929B CN114383929B CN202111601466.3A CN202111601466A CN114383929B CN 114383929 B CN114383929 B CN 114383929B CN 202111601466 A CN202111601466 A CN 202111601466A CN 114383929 B CN114383929 B CN 114383929B
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- 238000012360 testing method Methods 0.000 title claims abstract description 185
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 56
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 abstract description 5
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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
- G01N3/18—Performing tests at high or low temperatures
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Abstract
The disclosure relates to a concrete stress-strain testing device, which comprises a heating furnace, a displacement meter, a rigid sheet, an elastic piece, a connecting piece and a loading head; the heating furnace is internally provided with an accommodating cavity for accommodating a concrete test block, and the concrete test block is arranged on the top surface of a first heat insulation cushion block on the bottom wall in the accommodating cavity; the top of the accommodating cavity is provided with a first through hole for the compression bar to pass through; the rigid sheet is positioned above the heating furnace, a radial transverse channel is arranged at the lower part of the loading head, and the rigid sheet is arranged in the transverse channel in a penetrating way; the elastic piece is connected between the rigid sheet and the heating furnace; the connecting piece is vertically arranged on the compression bar, the top end of the connecting piece is connected with the rigid sheet, the bottom end of the connecting piece is in contact with the top of the concrete test block, and the loading head compresses the concrete test block when being loaded, so that the connecting piece moves under the driving of the elastic piece and the rigid sheet, the displacement of the rigid sheet measured by the displacement meter is the displacement of the concrete test block to be measured, the accurate simulation of the actual state of the concrete test block at high temperature is realized, and the accuracy and the reliability of a test result are improved.
Description
Technical Field
The disclosure relates to the technical field of stress strain testing, in particular to a concrete stress strain testing device.
Background
The concrete material is used as the most main bearing system of a modern building, the mechanical property of the concrete material under the high-temperature working condition can be obviously changed, and meanwhile, the mechanical property of the concrete under the high temperature is directly related to the bearing capacity of the whole building.
At present, the stress strain test of a concrete test block at high temperature is mostly to heat the concrete test block to a set temperature in a high-temperature furnace, then take out the concrete test block, test the concrete test block at room temperature, and apply pressure to the concrete test block during specific test, and obtain the strain capacity of the concrete test block by testing the displacement of the concrete test block.
However, since the prior art takes out the concrete test block heated to the set temperature from the high temperature furnace and tests the concrete test block at room temperature, there is a certain difference from the actual state of the concrete test block at high temperature, that is, the prior art cannot accurately simulate the stress strain result of the test concrete test block at high temperature.
Disclosure of Invention
In order to solve the technical problems described above or at least partially solve the technical problems described above, the present disclosure provides a concrete stress-strain testing device.
The disclosure provides a concrete stress-strain testing device, which comprises a heating furnace, a displacement meter, a rigid sheet, an elastic piece, a connecting piece and a loading head;
the heating furnace is provided with a containing cavity capable of containing a concrete test block, a first heat insulation cushion block is arranged on the inner bottom wall of the containing cavity, and the concrete test block is positioned on the top surface of the first heat insulation cushion block; a first through hole through which the loading head can pass is formed in the top of the accommodating cavity; the rigid sheet is positioned above the heating furnace, a transverse channel arranged along the radial direction of the loading head is arranged in the loading head, and the rigid sheet is penetrated in the transverse channel; the elastic piece is connected between the rigid sheet and the heating furnace;
the loading head is vertically provided with a connecting piece, the top end of the connecting piece is connected with the rigid sheet, the bottom end of the connecting piece is contacted with the top of the concrete test block, and the loading head compresses the concrete test block when being loaded so that the connecting piece moves under the drive of the rigid sheet and the elastic piece; and the displacement meter is used for measuring the displacement of the rigid sheet so as to determine the strain quantity of the concrete test block according to the displacement.
Optionally, a groove is formed in the inner bottom wall of the heating furnace, and the first heat insulation cushion block is located in the groove.
Optionally, the loading head comprises an upper pressing plate, a middle rod and a lower pressing plate, wherein the upper pressing plate is connected to the top of the middle rod, and the lower pressing plate is connected to the bottom of the middle rod;
the middle rod is arranged in the first through hole in a penetrating mode, the lower pressing plate is located in the accommodating cavity, and the diameters of the upper pressing plate and the lower pressing plate are larger than the diameter of the middle rod.
Optionally, the upper platen, the middle rod, and the lower platen are integrally formed.
Optionally, the connecting piece comprises a heat insulation pipe and a second heat insulation cushion block, and the heat insulation pipe is a hollow high-temperature-resistant sleeve;
the middle part of the middle rod is provided with a vertical channel from the lower part of the transverse channel to the bottom of the lower pressing plate, and the heat insulation pipe is arranged in the vertical channel; the second heat insulation cushion block is arranged on the bottom surface of the lower pressing plate and connected with the bottom end of the heat insulation pipe, and the second heat insulation cushion block is in contact with the top of the concrete test block.
Optionally, the second heat insulation pad has a size greater than the size of the concrete test block.
Optionally, the lower pressing plate and the second heat insulation cushion block have the same size
Optionally, the elastic component is the spring, the top of spring with just the piece is connected, the bottom of spring with the top of heating furnace is connected.
Optionally, a screw hole is formed in the position, corresponding to the spring, of the rigid plate, and the top end of the spring is connected with the rigid plate through a bolt matched with the screw hole.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
according to the concrete stress strain testing device, the heating furnace, the displacement meter, the rigid sheet, the elastic piece, the connecting piece and the loading head are arranged, the heating furnace is internally provided with the accommodating cavity for accommodating the concrete test block, the inner bottom wall of the accommodating cavity is provided with the first heat insulation cushion block, the concrete test block is positioned on the top surface of the first heat insulation cushion block, and the top of the accommodating cavity is provided with the first through hole for the loading head to pass through; the rigid sheet is positioned above the heating furnace, a transverse channel arranged along the radial direction of the loading head is arranged in the loading head, and the rigid sheet is arranged in the transverse channel in a penetrating way; the elastic piece is connected between the rigid sheet and the heating furnace; meanwhile, a connecting piece is vertically arranged on the loading head, the top end of the connecting piece is connected with the rigid piece, the bottom end of the connecting piece is contacted with the top of the concrete test block, and the loading head compresses the concrete test block when being loaded, so that the connecting piece moves under the drive of the rigid piece and the elastic piece; the displacement meter is used for measuring the displacement of the rigid sheet so as to determine the strain quantity of the concrete test block according to the displacement. The concrete test block is arranged on the top surface of the first heat insulation cushion block, so that the concrete test block is prevented from being directly contacted with the heating furnace, and the heat insulation effect of the heating furnace on the concrete test block is improved; the concrete test block to be tested is placed in the heating furnace for heating and heat preservation, at the moment, the concrete test block generates compression deformation when the loading head is loaded, the bottom end of the connecting piece is in contact with the top of the concrete test block, and the top end of the connecting piece is connected with the rigid sheet, so that when the concrete test block moves downwards, the connecting piece can move under the drive of the elastic piece and the rigid sheet, namely, the displacement of the concrete test block can be led out to room temperature for measurement through the connecting piece and the rigid sheet, namely, the displacement of the rigid sheet measured by the displacement meter is the displacement generated when the concrete test block is loaded by the loading head at preset temperature, the strain quantity of the concrete test block can be calculated according to the displacement, and meanwhile, the stress strain test of the concrete test block can be calculated according to the loading force received by the loading head, so that the stress strain test of the concrete test block is always performed in the heating furnace, the concrete test block can be accurately simulated at high temperature, and the actual state of the concrete test block can be further improved, and the accuracy and reliability of the concrete test device are ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic cross-sectional structural view of a concrete stress-strain testing device according to an embodiment of the disclosure.
Wherein, 1, an upper pressing plate; 2. a displacement meter; 3. a rigid sheet; 4. an elastic member; 5. a heating furnace; 6. a first insulating pad; 7. a concrete test block; 8. a lower pressing plate; 9. a vertical channel; 10. a transverse channel; 11. a heat insulating pipe; 12. a middle rod; 13. the second heat insulation cushion block; 14. a loading head.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Referring to fig. 1, the present embodiment provides a concrete stress-strain testing device, which specifically includes a heating furnace 5, a displacement meter 2, a rigid sheet 3, an elastic member 4, a connecting member and a loading head 14, wherein the thickness of the rigid sheet 3 in the present embodiment is 2mm, and it can be understood that, in specific implementation, a suitable rigid sheet thickness can be selected according to actual requirements.
The heating furnace 5 is provided with a containing cavity capable of containing the concrete test block 7, the inner bottom wall of the containing cavity is provided with a first heat insulation cushion block 6, and the concrete test block 7 is positioned on the top surface of the first heat insulation cushion block 6, so that the concrete test block 7 is prevented from being directly contacted with the heating furnace 5, and the heat insulation effect of the heating furnace 5 on the concrete test block 7 is improved; the first heat-insulating cushion block 6 may be, for example, a ceramic material or an alloy material, so as to avoid deformation of the first heat-insulating cushion block 6 in the heating furnace 5, thereby effectively supporting the concrete test block 7 while insulating the concrete test block 7.
Meanwhile, a first through hole through which the loading head 14 can pass is formed in the top of the accommodating cavity, and when the concrete test block 7 is implemented, an opening for replacing the concrete test block 7 can be formed in the side part or the top of the heating furnace 5, or the side part of the heating furnace 5 can be opened, so that the concrete test block 7 can be conveniently placed in the accommodating cavity during testing. The rigid sheet 3 is positioned above the heating furnace 5, a transverse channel 10 arranged along the radial direction of the loading head 14 is arranged in the loading head 14, and the rigid sheet 3 is penetrated in the transverse channel 10; the elastic member 4 is connected between the rigid sheet 3 and the heating furnace 5, wherein one end of the elastic member 4 may be connected with the top of the heating furnace 5 or may be connected with the side of the heating furnace 5, as long as the elastic member 4 can be connected between the rigid sheet 3 and the heating furnace 5.
Specifically, after the pressure to the loading head 14 can be removed by the press, the rigid sheet 3, the connecting piece and the loading head 14 rebound and reset under the action of the elasticity of the elastic piece 4, so that the concrete stress strain testing device can perform the next test, and further, the bottom end of the connecting piece and the top of the concrete test block 7 can be always contacted by the elastic piece 4, so that the accuracy of the displacement meter 2 on the displacement measurement of the concrete test block 7 is improved.
Referring to fig. 1, two elastic members 4 may be symmetrically disposed on both sides of the rigid sheet 3, however, in practice, the elastic members 4 may be plural, and plural elastic members 4 disposed between the rigid sheet 3 and the heating furnace 5 further ensure constant contact between the bottom end of the connecting member and the top of the concrete test block 7, and further improve rebound efficiency of the rigid sheet 3, the connecting member and the loading head 14 after pressure removal.
The loading head 14 is vertically provided with a connecting piece, the top end of the connecting piece is connected with the rigid sheet 3, the bottom end of the connecting piece is contacted with the top of the concrete test block 7, and the loading head 14 compresses the concrete test block 7 when being loaded so that the connecting piece moves under the drive of the rigid sheet 3 and the elastic piece 4; the displacement meter 2 is used for measuring the displacement of the rigid sheet 3 so as to determine the strain quantity of the concrete test block 7 according to the displacement, wherein the displacement meter 2 can be specifically attached to the concrete stress-strain testing device through an electromagnet bracket.
For example, referring to fig. 1, the pointers of the two displacement meters 2 point to the upper surface of the rigid sheet 3 and are symmetrically arranged about the loading head 14, and in a specific implementation, the two displacement meters 2 may be two or more, which is beneficial to judging whether the concrete test block 7 is horizontally placed in the high-temperature furnace or not and the coincidence condition of the central axis of the concrete test block 7 and the central axis of the loading head 14 according to the indication number of the displacement meters 2; meanwhile, in the testing process, the indication of the two displacement meters 2 can be utilized to judge whether the initial state position of the concrete test block 7 moves relatively due to manual operation and the like, so that the testing result is more accurate, and the accuracy of the testing result of the concrete stress strain testing device is improved.
In the concrete implementation, when the loading head 14 is loaded, the concrete test block 7 is compressed, because the top end of the connecting piece is connected with the rigid sheet 3, and the bottom end of the connecting piece is contacted with the top of the concrete test block 7, so that the connecting piece moves under the driving of the elastic piece 4 and the rigid sheet 3, at the moment, the displacement generated by the pressed concrete test block 7 is the same as the variable quantity of the displacement of the rigid sheet 3, and the corresponding displacement is measured by the displacement meter 2, in the concrete implementation, the loading head 14 can be loaded by a press machine, and the concrete value of the pressure applied by the press machine can be displayed on the press machine, so that the stress strain result of the concrete test block 7 is tested.
Wherein, it is assumed that the indication numbers of the two displacement meters 2 are L respectively 1 、L 2 The initial height of the concrete test block 7 is L, the force applied by the press is P, the cross-sectional area of the concrete test block 7 in the radial direction of the loading head 14 is a, and the stress σ and the strain epsilon of the concrete test block 7 are respectively:
referring to fig. 1, an exemplary heating furnace 5 may be opened and closed along a central axis thereof to facilitate placement of a loading head 14 in the heating furnace 5, threading a rigid sheet 3 in a transverse channel 10 of the loading head 14, connecting a top end of a connecting member with the rigid sheet 3, connecting an elastic member 4 between the rigid sheet 3 and the heating furnace 5, and finally placing a concrete test block 7 in a receiving cavity so that a bottom end of the connecting member contacts with a top end of the concrete test block 7, thereby realizing stress strain testing of the concrete test block 7 by pressing the loading head 14 and heating and heat preservation of the heating furnace 5.
When the concrete implementation is realized, firstly, the concrete test block 7 is preloaded before the heating furnace 5 is heated, the load with the stress being 1/3 of the axial compressive strength is continuously and evenly loaded, the constant load is kept for 60 seconds, the pointer readings of the displacement meters 2 at the two sides are recorded in the subsequent 30 seconds, if the difference between the deformation values at the left side and the right side is larger than 20% of the average value of the readings of the two displacement meters 2, the position of the concrete test block 7 is adjusted, the preloading is repeated, so that the difference between the deformation values at the left side and the right side of the displacement meters 2 is smaller than 20% of the average value of the readings of the two displacement meters 2, namely, the central axis of the concrete test block 7 is coincident with the central axis of the loading head 14 when the concrete test block 7 is horizontally placed in the high-temperature furnace; then heating the concrete test block 7 to a set temperature and keeping the temperature for 2-5 hours; and finally, pressurizing the concrete test block 7 by using a press machine through a loading head 14 to perform a stress strain test, and calculating a stress strain result of the concrete test block 7 at a set temperature through the indication of the displacement meter 2 and the force applied to the concrete test block 7 by the loading head 14.
According to the concrete stress strain testing device provided by the embodiment, the heating furnace 5, the displacement meter 2, the rigid sheet 3, the elastic piece 4, the connecting piece and the loading head 14 are arranged, the heating furnace 5 is provided with the accommodating cavity for accommodating the concrete test block 7, and the top of the accommodating cavity is provided with the first through hole for the loading head 14 to pass through; the rigid sheet 3 is positioned above the heating furnace 5, a transverse channel 10 arranged along the radial direction of the loading head 14 is arranged in the loading head 14, and the rigid sheet 3 is penetrated in the transverse channel 10; the elastic piece 4 is connected between the rigid sheet 3 and the heating furnace 5; the first heat insulation cushion block 6 is arranged on the inner bottom wall of the accommodating cavity, the concrete test block 7 is positioned on the top surface of the first heat insulation cushion block 6, meanwhile, a connecting piece is vertically arranged on the loading head 14, the top end of the connecting piece is connected with the rigid sheet 3, the bottom end of the connecting piece is contacted with the top of the concrete test block 7, and the loading head 14 compresses the concrete test block 7 when being loaded, so that the connecting piece moves under the drive of the rigid sheet 3 and the elastic piece 4; the displacement meter 2 is used for measuring the displacement of the rigid sheet 3 so as to determine the strain amount of the concrete test block 7 according to the displacement. The concrete test block 7 is positioned on the top surface of the first heat insulation cushion block 6, so that the concrete test block 7 is prevented from being directly contacted with the heating furnace 5, and the heat insulation effect of the heating furnace 5 on the concrete test block 7 is improved; the concrete test block 7 to be tested is placed in the heating furnace 5 for heating and heat preservation, at this moment, the concrete test block 7 generates compression deformation when the loading head 14 is loaded, because the bottom end of the connecting piece is in contact with the top of the concrete test block 7, and the top end of the connecting piece is connected with the rigid sheet 3, when the concrete test block 7 moves downwards, the connecting piece can move under the driving of the elastic piece 4 and the rigid sheet 3, namely, the displacement of the concrete test block 7 can be led out to room temperature through the connecting piece and the rigid sheet 3 for measurement, that is, the displacement of the rigid sheet 3 measured by the displacement meter 2 is the displacement generated when the concrete test block 7 is loaded by the loading head 14 at preset temperature, the strain quantity of the concrete test block 7 can be calculated according to the displacement, and the stress of the concrete test block 7 can be calculated according to the loading force received by the loading head 14, meanwhile, because the stress strain test of the concrete test block 7 is always performed in the heating furnace 5, the stress strain condition of the concrete test block 7 is ensured to be performed under high temperature condition, the concrete test block 7 can be accurately tested, and the actual stress test result can be further accurately simulated, and the reliability of the stress test device is improved.
Referring to fig. 1, a groove is formed in the inner bottom wall of the heating furnace 5, and the first heat insulation cushion block 6 is located in the groove to fix the position of the first heat insulation cushion block 6 well, so that stability of the concrete test block 7 in compression is guaranteed.
Wherein, loading head 14 includes top board 1, middle part pole 12 and holding down plate 8, and top board 1 connects at the top of middle part pole 12, and the bottom board 8 is connected in the bottom of middle part pole 12, and middle part pole 12 wears to establish in first through-hole, and holding down plate 8 is arranged in the holding chamber, and the diameter of top board 1 and holding down plate 8 is greater than the diameter of middle part pole 12, sets up so that the press is convenient for carry out the loading to loading head 14 to with the holding chamber in holding down plate 8 with load transfer for concrete test block 7 in order to compress concrete test block 7.
In concrete realization, upper plate 1, middle part pole 12 and holding down plate 8 can integrated into one piece, so set up, and upper plate 1, middle part pole 12 and holding down plate 8's wholeness is good, and joint strength is high to be favorable to improving its bearing capacity, and give concrete test block 7 with the load transfer of press, further improved the accuracy of this concrete stress strain testing device test result.
Referring to fig. 1, the connector comprises a heat insulation pipe 11 and a second heat insulation cushion block 13, wherein the heat insulation pipe 11 is a hollow high temperature resistant sleeve, a vertical channel 9 is formed in the middle of the middle rod 12 from the lower part of the transverse channel 10 to the bottom of the lower pressure plate 8, and the heat insulation pipe 11 is arranged in the vertical channel 9; the second heat insulation cushion block 13 is arranged on the bottom surface of the lower pressure plate 8 and is connected with the bottom end of the heat insulation pipe 11, the second heat insulation cushion block 13 is in contact with the top of the concrete test block 7, wherein the second heat insulation cushion block 13 is matched with the first heat insulation cushion block 6, the heat insulation effect on the concrete test block 7 can be further improved, the concrete test block 7 is always at the preset temperature, and the accuracy of the stress strain test result of the concrete test block 7 at the preset temperature is improved, so that the change of the stress strain of the concrete test block 7 in the actual high-temperature state can be better simulated.
The insulating tube 11 and the second insulating spacer 13 may be, for example, ceramic or alloy materials. The arrangement can avoid softening of the heat insulation pipe 11 and the second heat insulation cushion block 13 in the heating furnace 5, so that the displacement of the concrete test block 7 is conveniently led to room temperature for measurement through the second heat insulation cushion block 13 and the heat insulation pipe 11, and the accuracy of the test result of the concrete stress strain test device is improved.
Further, in order to ensure that the actual temperature of the concrete test block 7 in the heating furnace 5 is the temperature required by test, in the concrete implementation, a thermocouple for testing the temperature of the concrete test block 7 can be arranged in the concrete test block 7, and a first avoiding hole is formed at the position of the rigid sheet 3 corresponding to the heat insulation pipe 11; the position of the second heat insulation cushion block 13 corresponding to the heat insulation pipe 11 is provided with a second avoidance hole, and after the wires of the thermocouple pass through the second avoidance hole, the inner cavity of the heat insulation pipe 11 and the first avoidance hole in sequence, the wires pass through the transverse channel 10 and are communicated with a display instrument to test and display the actual temperature of the concrete test block 7, the actual temperature is compared with the preset temperature of the heating furnace 5, and the heating temperature of the heating furnace 5 is adjusted according to the actual test requirement, so that the actual heating temperature of the concrete test block 7 is the temperature required by the test requirement.
The size of the second heat insulation cushion block 13 is larger than that of the concrete test block 7, so that the stress of the second heat insulation cushion block 13 can be uniformly applied to the concrete test block 7, and the uniformity of the stress inside the concrete test block 7 is ensured.
Further, the sizes of the lower pressing plate 8 and the second heat insulation cushion block 13 are the same, for example, the lower pressing plate 8 is a circular plate, the second heat insulation cushion block 13 is a square block, the diameter of the lower pressing plate 8 is the same as the side length of the second heat insulation cushion block 13, the lower pressing plate 8 and the second heat insulation cushion block 13 with the same size ensure the stress area between the two when in contact, the stress uniformity of the lower pressing plate 8 and the second heat insulation cushion block 13 in the pressing process is facilitated, and the heat insulation effect of the second heat insulation cushion block 13 on the lower pressing plate 8 can be realized. Of course, in other implementations, the second heat insulation cushion block 13 may be a cylinder or a square body together with the lower platen 8.
In this embodiment, the elastic component 4 is a spring, the top of the spring is connected with the rigid sheet 3, the bottom of the spring is connected with the top of the heating furnace 5, the bottom of the heat insulation pipe 11 and the second heat insulation cushion block 13 can be better ensured to be in contact all the time through the spring, the displacement of the concrete test block 7 is conveniently led out to room temperature for measurement, the accuracy of the test result of the concrete stress-strain testing device is further improved, in addition, the rigid sheet 3, the connecting piece and the loading head 14 can be more quickly and reliably rebounded after the pressure of the press is removed through the spring, the next test can be conveniently carried out by the concrete stress-strain testing device, and of course, the elastic component 4 can be an elastic strip or an elastic rope or other elastic body when in specific implementation.
Wherein, the bottom of spring is directly connected with the top of heating furnace 5 can be with just piece 3 and heating furnace 5 more convenient and reliable link together to improved the good fixed to the spring bottom.
In some embodiments, the position of the rigid sheet 3 corresponding to the spring is provided with a screw hole, the top end of the spring is connected with the rigid sheet 3 through a bolt matched with the screw hole, so that the top end of the spring is firmly and reliably fixed on the rigid sheet 3, the stability of connection of the spring and the rigid sheet 3 is improved, the bottom end of the heat insulation pipe 11 is always contacted with the second heat insulation cushion block 13, the displacement measurement result of the concrete test block 7 is improved to a certain extent, and the accuracy of the test result of the whole concrete stress strain testing device is further improved.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The device for testing the stress strain of the concrete is characterized by comprising a heating furnace (5), a displacement meter (2), a rigid sheet (3), an elastic piece (4), a connecting piece and a loading head (14);
the heating furnace (5) is provided with a containing cavity capable of containing a concrete test block (7), a first heat insulation cushion block (6) is arranged on the inner bottom wall of the containing cavity, and the concrete test block (7) is positioned on the top surface of the first heat insulation cushion block (6); the top of the accommodating cavity is provided with a first through hole through which the loading head (14) can pass; the rigid sheet (3) is positioned above the heating furnace (5), a transverse channel (10) arranged along the radial direction of the loading head (14) is arranged in the loading head (14), and the rigid sheet (3) is arranged in the transverse channel (10) in a penetrating manner; the elastic piece (4) is connected between the rigid sheet (3) and the heating furnace (5);
the loading head (14) is vertically provided with a connecting piece, the top end of the connecting piece is connected with the rigid sheet (3), the bottom end of the connecting piece is contacted with the top of the concrete test block (7), and the loading head (14) compresses the concrete test block (7) when being loaded so that the connecting piece moves under the drive of the rigid sheet (3) and the elastic piece (4); the displacement meter (2) is used for measuring the displacement of the rigid sheet (3) so as to determine the strain quantity of the concrete test block (7) according to the displacement.
2. The concrete stress-strain testing device according to claim 1, characterized in that a groove is provided on the inner bottom wall of the heating furnace (5), in which groove the first heat insulating pad (6) is located.
3. The concrete stress-strain testing device according to claim 1, wherein the loading head (14) comprises an upper platen (1), a middle rod (12) and a lower platen (8), the upper platen (1) is connected to the top of the middle rod (12), and the lower platen (8) is connected to the bottom of the middle rod (12);
the middle rod (12) is arranged in the first through hole in a penetrating mode, the lower pressing plate (8) is located in the containing cavity, and the diameters of the upper pressing plate (1) and the lower pressing plate (8) are larger than the diameter of the middle rod (12).
4. A concrete stress-strain testing device according to claim 3, characterized in that the upper platen (1), the middle rod (12) and the lower platen (8) are integrally formed.
5. A concrete stress-strain testing device according to claim 3, characterized in that the connection comprises a heat insulating pipe (11) and a second heat insulating pad (13), the heat insulating pipe (11) being a hollow high temperature resistant sleeve;
the middle part of the middle rod (12) is provided with a vertical channel (9) from the lower part of the transverse channel (10) to the bottom of the lower pressure plate (8), and the heat insulation pipe (11) is arranged in the vertical channel (9); the second heat insulation cushion block (13) is arranged on the bottom surface of the lower pressing plate (8) and is connected with the bottom end of the heat insulation pipe (11), and the second heat insulation cushion block (13) is in contact with the top of the concrete test block (7).
6. The concrete stress-strain testing device according to claim 5, characterized in that the second insulating pad (13) has a size larger than the size of the concrete test block (7).
7. The concrete stress-strain testing device according to claim 5, characterized in that the lower platen (8) and the second insulating pad (13) are of the same size.
8. The concrete stress-strain testing device according to claim 1, wherein the elastic member (4) is a spring, the top end of the spring is connected with the rigid sheet (3), and the bottom end of the spring is connected with the top of the heating furnace (5).
9. The concrete stress-strain testing device according to claim 8, wherein screw holes are formed in positions, corresponding to the springs, of the rigid plates (3), and the top ends of the springs are connected with the rigid plates (3) through bolts matched with the screw holes.
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| US6029526A (en) * | 1998-05-14 | 2000-02-29 | Shannon & Wilson, Inc. | Method and apparatus for measuring in situ or stress of concrete |
| CN105547856A (en) * | 2015-12-21 | 2016-05-04 | 郑州大学 | Concrete material high temperature bending test machine and high temperature bending test method |
| CN205280509U (en) * | 2015-12-21 | 2016-06-01 | 郑州大学 | Compression testing machine in concrete material high temperature |
| CN109238872A (en) * | 2018-10-24 | 2019-01-18 | 山西大学 | Concrete sample high temperature steam pressure test furnace |
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| US6029526A (en) * | 1998-05-14 | 2000-02-29 | Shannon & Wilson, Inc. | Method and apparatus for measuring in situ or stress of concrete |
| CN105547856A (en) * | 2015-12-21 | 2016-05-04 | 郑州大学 | Concrete material high temperature bending test machine and high temperature bending test method |
| CN205280509U (en) * | 2015-12-21 | 2016-06-01 | 郑州大学 | Compression testing machine in concrete material high temperature |
| CN109238872A (en) * | 2018-10-24 | 2019-01-18 | 山西大学 | Concrete sample high temperature steam pressure test furnace |
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