CN111189704B - Concrete tension and compression dual-power creep test device and test method - Google Patents
Concrete tension and compression dual-power creep test device and test method Download PDFInfo
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- CN111189704B CN111189704B CN202010038236.XA CN202010038236A CN111189704B CN 111189704 B CN111189704 B CN 111189704B CN 202010038236 A CN202010038236 A CN 202010038236A CN 111189704 B CN111189704 B CN 111189704B
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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
- 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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
A concrete tension and compression double-power dynamic creep test device and a test method are disclosed, the test device comprises a test platform capable of providing mounting height, the test platform comprises a base and a stand column fixed on the base, a loading connecting rod is arranged in the middle of the stand column along the horizontal direction, a cross rod is arranged at the top of the stand column, a tension creep test mounting position is arranged between a rod body of the loading connecting rod and the cross rod, and a compression creep test mounting position is arranged between the rod body of the loading connecting rod and the base; the tension creep test mounting position is provided with a fixed tray connected with two ends of a concrete column test piece, and the compression creep test mounting position is provided with a force transmission plate for providing a pressure application surface; a loading tray is arranged on the loading connecting rod, and a variable load actuator is supported and arranged between the rod body of the loading connecting rod and the base. The method is simple and convenient to operate, can realize the creep test of the concrete sample under the action of dynamic load, and meets the requirements of tension creep and compression creep tests.
Description
Technical Field
The invention belongs to the field of concrete creep tests, and particularly relates to a concrete tension-compression dual-power creep test device and a test method, which are used for accurately testing the dynamic creep of concrete and meeting the requirements of tension and compression tests.
Background
Creep refers to the increased deformation of a material under load over time, in addition to elastic deformation. Creep of concrete is an inherent property of a material and is an important factor to be considered in concrete structure design calculation. At present, creep research at home and abroad is completed based on static tests, and influence factors considered by various proposed prediction models do not include dynamic loads [1 ]. However, in actual engineering, under the influence of various external factors, the load applied to the concrete structure is not only static load but also dynamic load. Therefore, a simple test apparatus capable of studying concrete creep under a dynamic load is required.
[1] Wang Jun, Lupeng, Lu Ching, Congratulations bridge concrete creep calculation model and its practical comments [ J ] engineering mechanics, 2018,35: 156-.
Disclosure of Invention
The invention aims to solve the problem that the concrete creep test in the prior art is only carried out based on static load, and provides a concrete tension-compression double-power-energy creep test device and a test method.
In order to achieve the purpose, the invention has the following technical scheme:
a concrete tension-compression double-power-driven creep test device comprises a test platform capable of providing mounting height, wherein the test platform comprises a base and a stand column fixed on the base, a loading connecting rod is arranged in the middle of the stand column along the horizontal direction, a cross rod is arranged at the top of the stand column, a tension creep test mounting position is arranged between a rod body of the loading connecting rod and the cross rod, and a compression creep test mounting position is arranged between the rod body of the loading connecting rod and the base; the tension creep test mounting position is provided with a fixed tray connected with two ends of a concrete column test piece, and the compression creep test mounting position is provided with a force transmission plate for providing a pressure application surface; the loading connecting rod is provided with a loading tray, and a variable load actuator is supported and arranged between the rod body of the loading connecting rod and the base.
As a preferred scheme of the test device, the two sides of the upright post are respectively provided with an inclined strut, one end of each inclined strut is connected to the upright post, and the other end of each inclined strut is connected to the base; and a support rod is connected between the bottom surface of the cross rod and the upright post.
As a preferred scheme of the test device, the fixed tray comprises an upper fixed tray and a lower fixed tray, the top of the upper fixed tray is suspended and hinged on the cross rod, one end of the loading connecting rod is hinged with the upright post, and the other end of the loading connecting rod is suspended with the load tray.
As a preferable scheme of the test device, the fixed tray comprises a tray bottom plate, one side surface of the tray bottom plate is respectively connected with the cross rod and a fixing piece arranged on the loading connecting rod body through a tray connecting rod, the other side surface of the tray bottom plate is provided with a mounting rack used for buckling the end part of the concrete column test piece, the mounting rack comprises a plurality of vertical mounting rods, one ends of the vertical mounting rods are fixed on the tray bottom plate through height adjusting components, and the other ends of the vertical mounting rods are connected into a whole through the transverse mounting rods.
One end of the vertical mounting rod penetrates through the tray bottom plate and is processed into an adjusting screw rod, and an adjusting nut is mounted on the adjusting screw rod.
As a preferred scheme of the test device, the base is composed of a plurality of base supporting rods, each base supporting rod comprises a width-direction supporting rod and two length-direction supporting rods connected to the width-direction supporting rods, the stand column is fixed in the middle of the width-direction supporting rod, and reinforcing rods are respectively connected between the middle of the width-direction supporting rod and the two length-direction supporting rods.
The invention also provides a concrete tension-compression double-power-capacity creep test method, which comprises the following steps:
1) pouring a concrete column test piece, and processing convex parts at two ends of the concrete column test piece subjected to the tension creep test;
2) after the concrete curing is finished, mounting a concrete column test piece, mounting a long-gauge displacement meter in the middle of the surface of the concrete column test piece along the length direction, and recording an initial value L0;
3) when a tension creep test is carried out, installing the convex parts at two ends of a concrete column test piece on the fixed tray, and hanging and hinging the top of the upper fixed tray on the cross rod; when a compressive creep test is carried out, a concrete column test piece is placed on a base, a force transmission plate is placed at the top end of the concrete column test piece, and the concrete column test piece is leveled and is in contact with the force transmission plate for compaction;
4) installing a loading connecting rod, and fixing the lower fixed tray and the loading connecting rod when a tension creep test is carried out; when a pressure creep test is carried out, the force transmission plate is fixed with the loading connecting rod;
5) installing a load tray, gradually placing the precast blocks in stages until the target constant load is reached, collecting and analyzing the elastic deformation value of the long-gauge displacement meter, and subtracting the initial value L0 to obtain an initial elastic deformation value Le;
6) acquiring debugging data of a loading variable load actuator;
7) and applying variable load, and continuously collecting and recording the elastic deformation value of the long gauge displacement meter.
As a further scheme, when analyzing the long-term deformation and creep value at a certain moment t, suspending the variable load actuator, and collecting the long-term deformation Lt after the data are stable; and the long-term relative deformation of the concrete column test piece is (Lt-Le), and after the influence of the shrinkage deformation Ls of the concrete is eliminated, the creep coefficient phi (t) under the influence of the variable load is obtained by comparing with the initial elastic deformation value Le, wherein phi (t) is (Lt-Le-Ls)/Le.
Compared with the prior art, the concrete tension-compression dual-power creep test device has the following beneficial effects: the load tray and the variable load actuator on the loading connecting rod are used for applying variable load to the concrete column test piece connected with the loading connecting rod to test and research the dynamic creep of the concrete column. The whole test device is in a self-balancing state, and the test field does not need other special treatment except leveling. The testing device has good stability, and in long-term testing, if the variable load actuator is temporarily stopped for maintenance or other reasons, the constant load part is applied by the fixed gravity of the load tray, so that the system cannot cause the problem of sudden unloading and zeroing. Meanwhile, when the variable load actuator is suspended, stable data can be read.
Compared with the prior art, the concrete tension-compression double-power creep test method is simple and convenient to operate, can realize the creep test of the concrete sample under the action of dynamic load, and meets the requirements of tension creep and compression creep test.
Drawings
FIG. 1 is an elevational view of the overall construction of the creep test apparatus of the present invention;
FIG. 2 is a side view of the overall construction of the creep test apparatus of the present invention;
FIG. 3 is a top view of the overall configuration of the creep test apparatus of the present invention;
FIG. 4 is a schematic diagram of a test piece structure of a tensile creep test concrete column according to the invention;
FIG. 5 is a schematic structural view of an upper mounting tray of the present invention;
FIG. 6 is a plan view of the mounting structure of the mounting tray of the present invention;
FIG. 7 is a schematic plan view of a bottom plate structure of a tray for fixing the tray according to the present invention;
FIG. 8 is a schematic view of an adjustment screw of the present invention securing a tray mount;
FIG. 9 is a schematic view of the construction of the loading tray of the present invention;
FIG. 10 is a schematic view of a variable load actuator of the present invention;
in the drawings: 1-a test platform; 1-1, upright post; 1-2. a base; 1-3, cross bar; 2-concrete column test piece; 3-1, fixing a tray; 3-2, lower fixing tray; 4-a loading linkage; 5-a variable load actuator; 6-loading the tray; 7-diagonal bracing; 8-hinge point; 9-adjusting the screw rod; 10-a tray floor; 11-a mounting frame; 12-concrete column test piece bulge; 13-force transmission plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1-3, the concrete tension-compression dual-function power creep test device comprises a steel test platform 1, wherein the test platform 1 comprises a base 1-2 and a stand column 1-1 fixed on the base 1-2, inclined struts 7 are respectively arranged on two sides of the stand column 1-1, one ends of the inclined struts 7 are connected to the top of the stand column 1-1, the other ends of the inclined struts 7 are connected to the end parts of the base 1-2, and the stand column 1-1 can be prevented from overturning towards two sides through the inclined struts 7. The base 1-2 is composed of a plurality of base supporting rods, each base supporting rod comprises a width direction supporting rod and two length direction supporting rods connected to the width direction supporting rods, the stand column 1-1 is fixed in the middle of the width direction supporting rods, and reinforcing rods are connected between the middle of the width direction supporting rods and the middle of the two length direction supporting rods.
A loading connecting rod 4 is arranged in the middle of the upright post 1-1 along the horizontal direction, one end of the loading connecting rod 4 is hinged with the upright post 1-1, a cross rod 1-3 is arranged at the top of the upright post 1-1, a tension creep test installation position is arranged between a rod body of the loading connecting rod 4 and the cross rod 1-3, and a compression creep test installation position is arranged between the rod body of the loading connecting rod 4 and the base 1-2; the tensile creep test installation position is provided with fixed trays connected with two ends of a concrete column test piece 2, each fixed tray comprises an upper fixed tray 3-1 and a lower fixed tray 3-2, the top of the upper fixed tray 3-1 is suspended and hinged on a cross rod 1-3, the lower fixed tray 3-2 is connected with a fixing piece arranged on a rod body of a loading connecting rod 4, and a supporting rod is connected between the bottom surface of the cross rod 1-3 and the upright column 1-1. And a force transmission plate 13 for providing a pressure application surface is arranged at the installation position of the pressure creep test, and the force transmission plate 13 is leveled and is tightly contacted with the test piece during the test. The other end of the loading connecting rod 4 is hung with a loading tray 6, and a variable load actuator 5 is supported and arranged between the rod body of the loading connecting rod 4 and the base 1-2, as shown in figures 9-10.
Referring to fig. 5-8, the fixed tray comprises a tray bottom plate 10, one side surface of the tray bottom plate 10 is respectively connected with cross rods 1-3 and a fixing piece arranged on a rod body of a loading connecting rod 4 through a tray connecting rod, an installation frame 11 used for buckling the end part of a concrete column test piece 2 is arranged on the other side surface of the tray bottom plate 10, the installation frame 11 comprises a plurality of vertical installation rods, the vertical installation rods surround a clamping piece matched with the end part of the test piece in contour, one end of each vertical installation rod is fixed on the tray bottom plate 10 through a height adjusting assembly, and the other end of each vertical installation rod is connected into a whole through a transverse installation rod. The height adjusting assembly is realized in a manner that one end of the vertical mounting rod penetrates through the tray bottom plate 10 and is processed into an adjusting screw 9, and an adjusting nut is mounted on the adjusting screw 9.
The test method based on the concrete tension-compression dual-power creep test device comprises the following steps:
1) pouring a concrete column test piece 2, processing protruding parts at two ends of the concrete column test piece 2 subjected to the tension creep test, wherein the structure of the processed concrete column test piece 2 is as shown in figure 4, the fixed tray is buckled and fixed with the protruding parts at the end of the concrete column test piece 2 to transfer tensile force, the concrete column test piece 2 subjected to the compression creep test can be uniformly pressurized directly through the loading connecting rod 4 and the force transfer plate 13, the buckling fixation is not needed, and the concrete column test piece 2 can adopt a column with a uniform cross section without a protruding section.
2) After the concrete curing is finished, mounting a concrete column test piece 2, mounting a long-gauge displacement meter in the middle of the surface of the concrete column test piece 2 along the length direction, and recording an initial value L0;
3) when a tension creep test is carried out, the convex parts at two ends of a concrete column test piece 2 are installed on the fixed tray, and the top of the upper fixed tray 3-1 is suspended and hinged on the cross rod 1-3; when a compressive creep test is carried out, a concrete column test piece 2 is placed on a base 1-2, a force transmission plate 13 is placed at the top end of the concrete column test piece 2, and the concrete column test piece 2 is leveled and is in contact with the force transmission plate for compaction;
4) installing a loading connecting rod 4, and fixing the lower fixed tray 3-2 and the loading connecting rod 4 when a tension creep test is carried out; when a pressure creep test is carried out, the force transmission plate 13 and the loading connecting rod 4 are fixed;
5) installing a load tray 6, gradually placing the precast blocks in stages until the target constant load is reached, collecting and analyzing the elastic deformation value of the long-gauge displacement meter, and subtracting the initial value L0 to obtain an initial elastic deformation value Le;
6) debugging data acquisition of a loading variable load actuator 5, wherein the variable load actuator 5 can be a jack;
7) and applying a variable load, and continuously collecting and recording the elastic deformation value of the long gauge length displacement meter.
When analyzing the long-term deformation and creep value at a certain moment t, suspending the variable load actuator 5, and collecting the long-term deformation Lt after the data are stable; at the moment, the long-term relative deformation of the concrete column test piece 2 is (Lt-Le), and after the influence of the shrinkage deformation Ls of the concrete is eliminated, the creep coefficient phi (t) under the influence of the variable load is obtained by comparing with the initial elastic deformation value Le, namely (Lt-Le-Ls)/Le.
According to the invention, the parallelism of the medium-straight concrete column test piece under the action of the dynamic load in the dynamic load test is observed for a long time, so that the dynamic creep mode is calculated, and theoretical reference considering the dynamic action is provided for bridge design and analysis. The invention solves the problem of the current concrete dynamic creep test, fills the blank of the test equipment and method, and provides a tool for dynamic creep research and analysis.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solution of the present invention in any way, and it should be understood by those skilled in the art that the technical solution can be modified and changed in several simple ways without departing from the spirit and principle of the present invention, and the modified and changed technical solution also falls into the protection scope of the appended claims.
Claims (6)
1. The utility model provides a concrete tension-compression dual-power creep test device which characterized in that: the device comprises a test platform (1) capable of providing a mounting height, wherein the test platform (1) comprises a base (1-2) and an upright post (1-1) fixed on the base (1-2), a loading connecting rod (4) is arranged in the middle of the upright post (1-1) along the horizontal direction, a cross rod (1-3) is arranged at the top of the upright post (1-1), a tension creep test mounting position is arranged between a rod body of the loading connecting rod (4) and the cross rod (1-3), and a compression creep test mounting position is arranged between the rod body of the loading connecting rod (4) and the base (1-2); the mounting position of the tension creep test is provided with a fixed tray connected with two ends of a concrete column test piece (2), and the mounting position of the compression creep test is provided with a force transmission plate (13) providing a pressure application surface; a load tray (6) is arranged on the loading connecting rod (4), and a variable load actuator (5) is supported and arranged between the rod body of the loading connecting rod (4) and the base (1-2);
the fixed tray comprises an upper fixed tray (3-1) and a lower fixed tray (3-2), the top of the upper fixed tray (3-1) is hinged to the cross rod (1-3) in a hanging mode, one end of the loading connecting rod (4) is hinged to the upright column (1-1), and the other end of the loading connecting rod is hung with the load tray (6);
the fixed tray comprises a tray bottom plate (10), one side surface of the tray bottom plate (10) is respectively connected with a cross rod (1-3) and a fixing piece arranged on the rod body of the loading connecting rod (4) through a tray connecting rod, the other side surface of the tray bottom plate (10) is provided with a mounting rack (11) used for buckling the end part of a concrete column test piece (2), the mounting rack (11) comprises a plurality of vertical mounting rods, one end of each vertical mounting rod is fixed on the tray bottom plate (10) through a height adjusting assembly, and the other end of each vertical mounting rod is connected into a whole through a transverse mounting rod.
2. The concrete tension-compression dual-power creep test device according to claim 1, characterized in that: inclined struts (7) are respectively arranged on two sides of the upright post (1-1), one end of each inclined strut (7) is connected to the upright post (1-1), and the other end of each inclined strut is connected to the base (1-2); a support rod is connected between the bottom surface of the cross rod (1-3) and the upright post (1-1).
3. The concrete tension-compression dual-power creep test device according to claim 1, characterized in that: one end of the vertical mounting rod penetrates through the tray bottom plate (10) and is processed into an adjusting screw rod (9), and an adjusting nut is mounted on the adjusting screw rod (9).
4. The concrete tension-compression dual-power creep test device according to claim 1, characterized in that: the base (1-2) comprises a plurality of base supporting rods, the base supporting rods comprise width direction supporting rods and two length direction supporting rods connected to the width direction supporting rods, the stand column (1-1) is fixed in the middle of the width direction supporting rods, and reinforcing rods are connected between the middle of the width direction supporting rods and the two length direction supporting rods respectively.
5. A test method based on the concrete tension-compression double-power creep test device of any one of claims 1-4, characterized by comprising the following steps:
1) pouring a concrete column test piece (2), and processing convex parts at two ends of the concrete column test piece (2) in a tension creep test;
2) after the concrete curing is finished, mounting a concrete column test piece (2), mounting a long-gauge displacement meter in the middle of the surface of the concrete column test piece (2) along the length direction, and recording an initial value L0;
3) when a tension creep test is carried out, the convex parts at two ends of a concrete column test piece (2) are installed on the fixed tray, and the top of the upper fixed tray (3-1) is suspended and hinged on the cross rod (1-3); when a stressed creep test is carried out, a concrete column test piece (2) is placed on the base (1-2), and a force transfer plate (13) is placed at the top end of the concrete column test piece (2) and is leveled and contacted closely;
4) installing a loading connecting rod (4), and fixing a lower fixed tray (3-2) and the loading connecting rod (4) when a tension creep test is carried out; when a pressure creep test is carried out, the force transfer plate (13) is fixed with the loading connecting rod (4);
5) installing a load tray (6), gradually placing the precast blocks in stages until the target constant load is reached, collecting and analyzing the elastic deformation value of the long-gauge displacement meter, and subtracting the initial value L0 to obtain an initial elastic deformation value Le;
6) debugging data acquisition of a loading variable load actuator (5);
7) and applying variable load, and continuously collecting and recording the elastic deformation value of the long gauge displacement meter.
6. The test method according to claim 5, characterized in that:
when analyzing the long-term deformation and creep value at a certain moment t, suspending the variable load actuator (5) firstly, and collecting the long-term deformation Lt after the data are stable; at the moment, the long-term relative deformation of the concrete column test piece (2) is (Lt-Le), and after the influence of the shrinkage deformation Ls of the concrete is eliminated, the creep coefficient phi (t) under the influence of the variable load is obtained by comparing with the initial elastic deformation value Le, wherein phi (t) is (Lt-Le-Ls)/Le.
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| LV15659B (en) * | 2020-12-28 | 2023-05-20 | Rīgas Tehniskā Universitāte | Method for determination of long-term properties of concrete and cement composites in various stress conditions |
| CN113310811B (en) * | 2021-04-21 | 2024-01-26 | 北京工业大学 | Cement-based material axial pressure creep testing device capable of regulating temperature, humidity and load |
| CN113405911B (en) * | 2021-05-10 | 2022-09-09 | 同济大学 | Experimental device and experimental method for synchronously measuring tension and compression creep of concrete |
| CN113237753B (en) * | 2021-05-11 | 2022-09-13 | 宋博翰 | Concrete shrinkage creep analysis device and method thereof |
| CN114486500B (en) * | 2022-02-25 | 2023-11-10 | 哈尔滨工业大学 | Concrete creep test device suitable for various stress combinations and test method thereof |
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| CN111189704A (en) | 2020-05-22 |
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