CN216208503U - Dynamic drawing test tool for structural bars and concrete - Google Patents
Dynamic drawing test tool for structural bars and concrete Download PDFInfo
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- CN216208503U CN216208503U CN202122481356.XU CN202122481356U CN216208503U CN 216208503 U CN216208503 U CN 216208503U CN 202122481356 U CN202122481356 U CN 202122481356U CN 216208503 U CN216208503 U CN 216208503U
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- 239000004567 concrete Substances 0.000 title claims abstract description 70
- 238000012360 testing method Methods 0.000 title claims abstract description 51
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- 238000007586 pull-out test Methods 0.000 claims abstract description 17
- 210000003205 muscle Anatomy 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000004880 explosion Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
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- 101710107464 Probable pyruvate, phosphate dikinase regulatory protein, chloroplastic Proteins 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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Abstract
The utility model provides a dynamic drawing test tool for a structural bar and concrete, and relates to the field of a structural bar and concrete bonding test. The dynamic pull-out test tool for the structural bars and the concrete comprises a rigid support and a force transmission support structure, wherein the force transmission support structure is movably assembled with the rigid support, one side of the rigid support is provided with a stop surface, and the stop surface is used for being matched with a concrete block stop of a structural concrete test piece; the rigid support is provided with a through hole for the loading end of the structural rib to penetrate out, the middle part of the force transmission support structure is provided with an accommodating space, and the accommodating space is arranged corresponding to the through hole for mounting a structural reinforced concrete test piece; the upper part of the force transmission support structure is provided with an impact loading part, the impact loading part and the rigid support are arranged at an interval from top to bottom, the lower part of the force transmission support structure is provided with a stretching loading part, the stretching loading part is positioned at the lower side of the rigid support, and the stretching loading part is used for being connected with a loading end of a structural rib so as to transmit impact acting force to form dynamic drawing force on the structural rib.
Description
Technical Field
The utility model relates to the technical field of structural bar and concrete bonding tests, in particular to a dynamic pull-out test tool for a structural bar and concrete.
Background
In the building engineering, no matter the steel bar or the BFRP bar, the bonding property between the structural bar and the concrete is of great importance, and the safety of the structural engineering is directly influenced by the good or bad bonding property.
The test device comprises a hydraulic servo test machine, a test piece drawing frame, a LVDT fixing protection clamp and a spherical hinge, wherein the test piece drawing frame is formed by assembling a top plate, a bottom plate, a screw rod and a nut, threaded holes capable of penetrating through the screw rod are formed in four corners of the top plate and the bottom plate, the top surface of the top plate is connected with a top screw rod matched with the spherical hinge, a round hole penetrating through a test steel bar is formed in the center of the bottom plate, the hydraulic servo test machine is connected with the test piece drawing frame through the spherical hinge, the test piece drawing frame is used for fixing the test piece, and the LVDT fixing protection clamp is arranged at the free end of the test steel bar.
In the static and dynamic bonding slippage overall process curve test device in the prior art, a hydraulic servo test machine is adopted to output drawing force, generally, the loading rate of the drawing test device is low, equipment with high loading rate is difficult to be used in a dynamic drawing test, and the test research on the anti-impact explosion performance and the dynamic failure mechanism of a structural concrete member cannot be realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a dynamic pull-out test tool for structural bars and concrete, so as to solve the problems that the loading rate of a general pull-out test device is low, and a device with a high loading rate is difficult to be used in a dynamic pull-out test, and the test research on the anti-impact explosion performance and the dynamic failure mechanism of a structural concrete member cannot be realized.
The technical scheme of the dynamic drawing test tool for the structural bar and the concrete is as follows:
the dynamic drawing test tool for the structural bars and the concrete comprises a rigid support and a force transmission support structure, wherein the force transmission support structure is movably assembled with the rigid support, one side of the rigid support is provided with a stop surface, and the stop surface is used for being in stop fit with a concrete block of a structural concrete test piece;
the rigid support is provided with a through hole for the loading end of a structural bar of a structural concrete test piece to penetrate out, the middle part of the force transmission support structure is provided with an accommodating space, and the accommodating space is arranged corresponding to the through hole for the mounting of the structural concrete test piece;
the upper portion of biography power supporting structure is equipped with impact loading portion, impact loading portion with interval arrangement about the rigid support, the lower part of biography power supporting structure is equipped with tensile loading portion, tensile loading portion is located the downside of rigid support, tensile loading portion is used for being connected with the loading end of structure muscle to transmission impact force forms dynamic drawing power to the structure muscle.
Furthermore, the force transmission support structure is a hollow frame structure, the rigid support is transversely arranged at the hollow position of the force transmission support structure, and two ends of the rigid support respectively protrude to the outer side of the force transmission support structure.
Furthermore, the force transmission support structure comprises a hemispherical arch top part and a force transmission seat which are arranged at an upper interval and a lower interval, the impact loading part is arranged on the hemispherical arch top part, and the stretching loading part is arranged on the force transmission seat.
Furthermore, the force transmission support structure further comprises two force transmission side plates, the force transmission side plates are fixedly connected between the hemispherical arch crown part and the force transmission seat, the two force transmission side plates are arranged at intervals, and the rigid support is arranged between the two force transmission side plates and is in clearance fit with the force transmission side plates.
Furthermore, the force transmission side plate is an arc-shaped side plate, the upper edge of the arc-shaped side plate is smoothly connected with the lower edge of the hemispherical arch crown part, and the vertical projection contour of the arc-shaped side plate is superposed with the vertical projection contour of the hemispherical arch crown part.
Further, the middle part of biography power seat is equipped with the preformed hole, the preformed hole with the through-hole corresponds and arranges, the downside of biography power seat corresponds the preformed hole butt is equipped with the bonding sleeve, the bonding sleeve constitutes be used for with the tensile loading portion of the loading end connection of structure muscle.
Furthermore, the impact loading part is detachably provided with a rubber cushion block for adjusting the rubber cushion blocks with different thicknesses so as to obtain different impact force pulse waveforms.
Has the advantages that: the dynamic pull-out test tool for the structural bars and the concrete adopts a design form of a rigid support and a force transmission support structure, the force transmission support structure is movably assembled with the rigid support, one side of the rigid support is provided with a stop surface, the middle part of the force transmission support structure is provided with an accommodating space, the upper part of the force transmission support structure is provided with an impact loading part, and the lower part of the force transmission support structure is provided with a tensile loading part; and placing the structural concrete test piece in the accommodating space, enabling the concrete block to be positioned on the stop surface of the rigid support, and enabling the structural bar to penetrate out of the through hole of the rigid support so as to connect the loading end of the structural bar with the tensile loading part.
The impact loading device is used for applying transient impact force to an impact loading part of the force transmission support structure, no direct stress relation exists between the force transmission support structure and the rigid support, the force transmission support structure is used for transmitting impact load from the upper part to the lower part of the rigid support, and dynamic tensile load is generated on a loading end of the structural bar through the tensile loading part, so that a dynamic drawing test on the bonding property of the structural bar-concrete interface is realized; and the axial displacement of the free end of the structural bar can be detected by combining with a displacement detection element to obtain the interface slippage of the structural bar and the concrete, so that the bonding stress-relative slippage relation between the structural bar and the concrete under the corresponding dynamic tensile load is obtained, and the experimental research on the anti-impact explosion performance and the dynamic failure mechanism of the structural concrete member is realized.
Drawings
FIG. 1 is a schematic front view of a dynamic pull-out test fixture for structural bars and concrete in a specific embodiment of the dynamic pull-out test fixture for structural bars and concrete of the present invention;
FIG. 2 is a schematic top view of the rigid mount of FIG. 1;
FIG. 3 is a schematic top view of the force transfer bracket arrangement of FIG. 1;
figure 4 is a schematic cross-sectional view of the force transfer bracket arrangement of figure 3 at a-a.
In the figure: 1-rigid support, 10-through hole, 11-support piece and 12-angle steel;
2-a force transmission support structure, 20-a hemispherical dome part, 21-a force transmission side plate, 22-a force transmission seat, 23-an impact loading part, 24-a stretching loading part and 25-a rubber cushion block;
3-displacement detection element, 4-structural concrete test piece, 40-concrete block, 41-structural bar, 42-loading end of structural bar and 43-free end of structural bar.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
In the embodiment 1 of the dynamic pull-out test tool for the structural bar and the concrete of the present invention, as shown in fig. 1 to 4, the dynamic pull-out test tool for the structural bar and the concrete includes a rigid support 1 and a force transmission support structure 2, the force transmission support structure 2 is movably assembled with the rigid support 1, wherein the structural bar concrete test piece 4 includes a concrete block 40 and a structural bar 41 which are connected by bonding, one side of the rigid support 1 is provided with a stop surface, and the stop surface is used for stop-matching with the concrete block 40 of the structural bar concrete test piece 4.
The rigid support 1 is provided with a through hole 10 for the loading end 42 of the structural bar of the structural concrete test piece 4 to penetrate out, the middle part of the force transmission support structure 2 is provided with an accommodating space, and the accommodating space is arranged corresponding to the through hole 10 for the installation of the structural concrete test piece 4; the upper portion of power transmission support structure 2 is equipped with impact loading portion 23, and impact loading portion 23 and rigid support 1 interval arrangement from top to bottom, and the lower part of power transmission support structure 2 is equipped with tensile loading portion 24, and tensile loading portion 24 is located the downside of rigid support 1, and tensile loading portion 24 is used for being connected with the loading end 42 of structural reinforcement to the transmission impact effort is in order to form dynamic drawing power to structural reinforcement 41.
The dynamic pull-out test tool for the structural bar and the concrete adopts the design form of a rigid support 1 and a force transmission support structure 2, the force transmission support structure 2 is movably assembled with the rigid support 1, one side of the rigid support 1 is provided with a stop surface, the middle part of the force transmission support structure 2 is provided with an accommodating space, the upper part of the force transmission support structure 2 is provided with an impact loading part 23, the lower part of the force transmission support structure 2 is provided with a tensile loading part 24, a structural concrete test piece 4 can be placed in the accommodating space, a concrete block 40 is positioned on the stop surface of the rigid support 1, and the structural bar 41 penetrates out of a through hole 10 of the rigid support 1 so as to connect a loading end 42 of the structural bar with the tensile loading part 24.
The impact loading device is used for applying transient impact force to the impact loading part 23 of the force transmission support structure 2, no direct stress relation exists between the force transmission support structure 2 and the rigid support 1, the force transmission support structure 2 is used for transmitting impact load from the upper part to the lower part of the rigid support 1, and the tensile loading part 24 is used for generating dynamic tensile load to the loading end 42 of the structural bar, so that the dynamic drawing test of the bonding property of the structural bar-concrete interface is realized; moreover, the axial displacement of the free end 43 of the structural bar can be detected by combining the displacement detection element 3, so that the interface slippage of the structural bar and the concrete can be obtained, the bonding stress-relative slippage relation between the structural bar 41 and the concrete under the corresponding dynamic tensile load can be further obtained, and the experimental research on the anti-impact explosion performance and the dynamic failure mechanism of the structural concrete member can be realized.
In this embodiment, the force transmission support structure 2 is a hollow frame structure, the rigid support 1 is transversely disposed at the hollow position of the force transmission support structure 2, and two ends of the rigid support 1 respectively protrude to the outer side of the force transmission support structure 2. The two ends of the rigid support 1 can be fixedly arranged on the base of the impact loading equipment, so that the rigid support 1 keeps the same position under the action of impact load.
This a dynamic tensile test frock for structural muscle and concrete can cooperate the work of impact loading equipment, and impact loading equipment such as drop hammer impact tester, drop hammer impact tester be equipped with pass power support structure 2 impact loading portion 23 matched with drop the hammer, utilize the drop hammer potential energy of eminence to turn into kinetic energy to exert transient impact effect to impact loading portion 23. The weight and height of the drop hammer can be adjusted to obtain different impact energy and drop hammer impact speed, the impact force loading speed is high, and the damage condition of impact explosion is well simulated. The different impact loads are converted into dynamic pulling loads on the loading end 42 of the structural bar by using the test system, and the dynamic bonding-sliding relation between the structural bar and the concrete interface under multiple working conditions can be obtained.
In this embodiment, the force-transmitting support structure 2 includes a hemispherical dome portion 20, a force-transmitting side plate 21 and a force-transmitting seat 22, the hemispherical dome portion 20 and the force-transmitting seat 22 are arranged at an interval from top to bottom, the force-transmitting side plate 21 is fixedly connected between the hemispherical dome portion 20 and the force-transmitting seat 22, the impact loading portion 23 is arranged on the hemispherical dome portion 20, and the tension loading portion 24 is arranged on the force-transmitting seat 22.
The impact loading part 23 is arranged at the top of the spherical vault part 20, the hemispherical vault part 20 is good in impact resistance and not prone to deformation, vertical impact load can be uniformly dispersed along the surface direction of the vault part and is continuously transmitted downwards along the axis direction, then the impact load is transmitted to the force transmission seat 22 through the force transmission side plate 21, the tensile loading part 24 generates a dynamic drawing effect on the loading end 42 of the structural rib, and the accuracy of test data and the reusability of the device are improved.
The force transmission side plates 21 are arc-shaped side plates, the two arc-shaped side plates 21 are arranged at intervals, the rigid support 1 is arranged between the two arc-shaped side plates and is in clearance fit with the arc-shaped side plates, and the force transmission support structure 2 can move up and down relative to the rigid support 1. Specifically, the force transmission side plate 21 is a minor arc side plate, the two minor arc side plates are symmetrically arranged about the central axis of the force transmission support structure 2, the minor arc side plate has high structural strength and good pressure resistance, and the impact load can be continuously transmitted downwards.
A preformed hole for the loading end 42 of the structural rib to penetrate through is formed in the middle of the force transmission seat 22, the tensile loading part 24 is a bonding sleeve abutted to the lower side of the preformed hole of the force transmission seat 22, and the outer diameter of the bonding sleeve is slightly larger than the diameter of the preformed hole of the force transmission seat 22; moreover, the bonding sleeve is fixedly connected with the loading end 42 of the structural rib, and epoxy resin is filled between the structural rib 41 and the bonding sleeve, so that the impact load borne by the force transmission support structure 2 is converted into a dynamic drawing effect on the structural rib 41.
In addition, the impact loading part 23 of the force transmission support structure 2 is detachably provided with a rubber cushion block 25, and the rubber cushion block 25 with different thicknesses is used for adjusting the rubber cushion block 25 to obtain different impact force pulse waveforms. By changing the thickness of the rubber cushion block 25, different impact force pulse waveforms can be obtained, and dynamic loading under different working conditions is realized.
When the dynamic drawing test tool for the structural bars and the concrete is used for testing, the dynamic drawing test tool comprises the following steps:
s1, the concrete block 40 of the structural concrete test piece 4 is installed on the stop surface of the rigid support 1, and the concrete block 40 of the structural concrete test piece 4 is fixedly connected through the four angle steels 12 of the rigid support 1, so that the loading end 42 of the structural bar penetrates out of the through hole 10 of the rigid support 1.
S2, mounting the displacement detection element 3, preferably, the displacement detection element 3 is a displacement sensor, a support piece 11 is arranged on the rigid support 1, the support piece 11 is an inverted L-shaped steel sheet, a horizontal section of the inverted L-shaped steel sheet is provided with a circular through hole, a shell of the displacement sensor penetrates through the circular through hole and is screwed and fixed through a nut, and a measuring rod of the displacement sensor is in butt fit with the surface of the free end 43 of the structural rib.
S3, installing the force transmission support structure 2, and connecting the tensile loading part 24 of the force transmission support structure 2 with the loading end 42 of the structural rib, so that the structural concrete test piece 4 is placed in the accommodating space of the force transmission support structure 2; the impact loading part 23 of the force transmission support structure 2 is positioned above the rigid support 1, and the tensile loading part 24 is positioned at the lower side of the rigid support 1 and is fixedly connected with the loading end 42 of the structural rib, so that the force transmission support structure 2 can freely move up and down relative to the rigid support 1, and the impact load is converted into the dynamic tensile load of the structural rib 41 through the force transmission support structure 2.
S4, fixing the rigid support 1 on a base of the impact loading equipment, and adjusting the position of the force transmission support structure 2 to enable the impact loading part 23 of the force transmission support structure 2 to be aligned with the loading position of the impact loading equipment; specifically, the impact loading device is a drop hammer impact tester, and the impact loading point of the impact loading portion 23 is adjusted to be just below the center of the drop hammer.
S5, electrically connecting the displacement detection element 3 with dynamic data acquisition equipment; the data line or the wireless communication module can be electrically connected with the data acquisition equipment, so that the axial displacement of the free end 43 of the structural rib detected by the displacement sensor is transmitted to the data acquisition equipment, and data recording and analysis are realized.
S6, starting impact loading equipment to start an impact test;
s7, after the impact test is finished, taking out the rigid support 1, the force transmission support structure 2 and the structural concrete test piece 4, and analyzing impact force and relative sliding data of structural bars and a concrete interface; in S7, the formula is expressed
Calculating the average value of the bonding strength, wherein: tau is the average value of the bonding strength of the structural bar and the concrete, F is the drawing force when the test piece is loaded, d is the diameter of the structural bar, and l is the bonding length of the structural bar and the concrete block.
S8, changing the impact force, and repeating the above steps; the weight and height of the drop hammer can be adjusted to obtain different impact energy and drop hammer impact speed, the impact force loading speed is high, and the damage condition of impact explosion is well simulated; by changing the thickness of the rubber cushion block 25, different impact force pulse waveforms can be obtained, and dynamic loading under different working conditions is realized.
In S8, the axial displacement of the free end of the structural bar detected by the displacement detecting element 3 is subtracted from the displacement of the force-transmitting bracket structure 2 automatically recorded by the impact loading device to obtain the interface slippage of the structural bar and the concrete, and the bonding strength-relative slippage relationship between the structural bar and the concrete under the action of the corresponding dynamic tensile load is obtained.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. A dynamic pull-out test tool for a structural bar and concrete is characterized by comprising a rigid support and a force transmission support structure, wherein the force transmission support structure is movably assembled with the rigid support, one side of the rigid support is provided with a stop surface, and the stop surface is used for being in stop fit with a concrete block of a structural concrete test piece;
the rigid support is provided with a through hole for the loading end of a structural bar of a structural concrete test piece to penetrate out, the middle part of the force transmission support structure is provided with an accommodating space, and the accommodating space is arranged corresponding to the through hole for the mounting of the structural concrete test piece;
the upper portion of biography power supporting structure is equipped with impact loading portion, impact loading portion with interval arrangement about the rigid support, the lower part of biography power supporting structure is equipped with tensile loading portion, tensile loading portion is located the downside of rigid support, tensile loading portion is used for being connected with the loading end of structure muscle to transmission impact force forms dynamic drawing power to the structure muscle.
2. The dynamic pull-out test tool for the structural bars and the concrete according to claim 1, wherein the force transmission support structure is a hollow frame structure, the rigid support is transversely arranged at a hollow position of the force transmission support structure, and two ends of the rigid support respectively protrude to the outer side of the force transmission support structure.
3. The dynamic pull-out test tool for the structural bars and the concrete according to claim 2, wherein the force transmission support structure comprises a hemispherical arch part and a force transmission seat which are arranged at intervals up and down, the impact loading part is arranged on the hemispherical arch part, and the tensile loading part is arranged on the force transmission seat.
4. The dynamic pull-out test tool for the structural bars and the concrete according to claim 3, wherein the force transmission support structure further comprises two force transmission side plates, the force transmission side plates are fixedly connected between the hemispherical arch crown part and the force transmission seat, the two force transmission side plates are arranged at intervals, and the rigid support is arranged between the two force transmission side plates and is in clearance fit with the force transmission side plates.
5. The dynamic pull-out test tool for the structural bars and the concrete according to claim 4, wherein the force transmission side plate is an arc-shaped side plate, the upper edge of the arc-shaped side plate is smoothly connected with the lower edge of the hemispherical arch crown part, and the vertical projection profile of the arc-shaped side plate is superposed with the vertical projection profile of the hemispherical arch crown part.
6. The dynamic pulling test tool for the structural bar and the concrete according to any one of claims 3 to 5, wherein a preformed hole is formed in the middle of the force transmission seat and is arranged corresponding to the through hole, a bonding sleeve is arranged on the lower side of the force transmission seat corresponding to the preformed hole in an abutting mode, and the bonding sleeve forms a tensile loading portion used for being connected with a loading end of the structural bar.
7. The dynamic pull-out test tool for the structural bars and the concrete according to any one of claims 1 to 5, wherein the impact loading part is detachably provided with rubber cushion blocks for adjusting the rubber cushion blocks with different thicknesses so as to obtain different impact force pulse waveforms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122481356.XU CN216208503U (en) | 2021-10-14 | 2021-10-14 | Dynamic drawing test tool for structural bars and concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122481356.XU CN216208503U (en) | 2021-10-14 | 2021-10-14 | Dynamic drawing test tool for structural bars and concrete |
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| Publication Number | Publication Date |
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| CN216208503U true CN216208503U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122481356.XU Active CN216208503U (en) | 2021-10-14 | 2021-10-14 | Dynamic drawing test tool for structural bars and concrete |
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| CN (1) | CN216208503U (en) |
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2021
- 2021-10-14 CN CN202122481356.XU patent/CN216208503U/en active Active
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