CN112525727A - Testing device for shear deformation of core area of concrete member and mounting and testing method - Google Patents
Testing device for shear deformation of core area of concrete member and mounting and testing method Download PDFInfo
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- CN112525727A CN112525727A CN202011247689.XA CN202011247689A CN112525727A CN 112525727 A CN112525727 A CN 112525727A CN 202011247689 A CN202011247689 A CN 202011247689A CN 112525727 A CN112525727 A CN 112525727A
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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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
- G01N3/04—Chucks
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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
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a device for testing the shear deformation of a core area of a concrete member and a mounting and testing method, belonging to the civil engineering industry. The testing device for the shear deformation of the core area of the concrete member comprises a fixing device and a displacement transducer LVDT; the fixing devices are respectively arranged at four top corners of the concrete sample; the two fixing devices are used for fixing the displacement sensors LVDT, and the displacement sensors LVDT are inserted into the concrete sample in a staggered manner; the fixing device is fixed at the top corner of the concrete sample through glue; and the deformation displacement value of the test piece measured by the displacement sensor LVDT is transmitted to the data acquisition instrument through a data line. Aiming at the current situation that the shear deformation of the core area of the concrete member in the existing civil engineering industry is difficult to accurately measure, the test device for accurately measuring the shear deformation of the core area of the concrete member provided by the invention is made of light materials, and is simple and convenient to install.
Description
Technical Field
The invention relates to a device for testing the shear deformation of a core area of a concrete member and a mounting and testing method, belonging to the civil engineering industry.
Background
Civil engineering construction is always the key point of national construction and development, is the prop industry of national economic development, and the research on the shear deformation of concrete structures and members is particularly important for the seismic design, construction and reinforcement of concrete structures.
Experimental research and investigation show that the shear deformation area of the existing concrete test piece is mainly a displacement sensor LVDT or a displacement meter, and the fixing clamp is directly adhered to the surface of the test piece through glue. However, in the testing process, due to the fact that the clamp is in cross deformation, the clamp can be stuck infirm and fall off, and the testing rod is not in a straight line, so that accurate measurement of shear deformation can not be carried out accurately according to actual deformation by means of relative sliding. At present, a double-sided adhesive tape or a clamp is mainly adopted to fix a displacement sensor LVDT or a displacement meter in the test process, but a device for measuring the shearing deformation of a core area of a concrete member with high accuracy does not exist.
Disclosure of Invention
The invention provides a device for testing the shear deformation of a concrete member core area, and an installation and test method aiming at the problems.
The invention adopts the following technical scheme:
the invention relates to a test device for the shear deformation of a core area of a concrete member, which comprises a fixing device and a displacement transducer LVDT; the fixing devices are respectively arranged at four top corners of the concrete sample; the two fixing devices are used for fixing the displacement sensors LVDT, and the displacement sensors LVDT are inserted into the concrete sample in a staggered manner; the fixing device is fixed at the top corner of the concrete sample through glue; and the deformation displacement value of the test piece measured by the displacement sensor LVDT is transmitted to the data acquisition instrument through a data line.
The invention relates to a testing device for the shear deformation of a core area of a concrete member, wherein a fixing device comprises an upper cover plate, a fixing clamp, a side plate, a lower cover plate and an inner side plate; the upper cover plate and the lower cover plate are 1/4 arc plates with the same size, two ends of the arc extension of the upper cover plate and the lower cover plate are respectively provided with a side plate, two side ends of the slideway are of an opening structure, and two circumferential arc end surfaces of the upper cover plate and the lower cover plate are of an opening structure; the inner side plate is 1/4 circular arc plates with the same length as the upper cover plate and the lower cover plate, the cover plate and the lower cover plate are covered together, two parallel inner side plates are vertically arranged between the upper cover plate and the lower cover plate, and a slide way for the fixing clamp to slide is formed between the two parallel inner side plates.
According to the device for testing the shearing deformation of the core area of the concrete member, the fixing clamp is longitudinally arranged in the slideway, the two side walls of the slideway are respectively provided with the sliding groove, and the fixing clamp slides along the extension length of the sliding groove.
According to the device for testing the shear deformation of the core area of the concrete member, the fixed clamp is internally provided with a pore passage through which the LVDT passes, the radial direction of the opposite pore passage is provided with a threaded hole communicated with the pore passage, and the threaded hole is internally provided with a bolt which is used for abutting against and fixing the shell of the LVDT.
According to the device for testing the shear deformation of the core area of the concrete member, the length of the sliding groove is 1/2 of the length of the inner side plate. For fixing and restraining the holding jig; the sliding groove is long for the fixed displacement sensor LVDT to slide in the stroke.
The invention relates to an installation method of a test device for shear deformation of a core area of a concrete member, which comprises the following steps:
1) and adopting fixing devices with different sizes according to different concrete samples. For the condition that wall type components need to measure large deformation, a fixing device with a large model number and a displacement transducer LVDT are adopted; for the condition that the beam column node type component needs to measure small deformation, a fixing device with a small or medium type and a displacement transducer LVDT are adopted.
2) Manufacturing an upper cover plate and a lower cover plate with corresponding sizes according to the size of the concrete sample, and fixing 4 pieces of end parts with L-shaped side plates on the lower cover plate; a slideway is reserved between the upper cover plate and the lower cover plate; 1/4 arc inner side plates are arranged on two sides of the slideway;
3) placing the fixed clamp in the slideway in the longitudinal direction, and coating lubricating oil on the inner side of the slideway;
4) fixing the upper cover plate on the lower cover plate, and fixing the upper cover plate and the lower cover plate with each other through a side plate;
5) the main body rod of the displacement sensor LVDT penetrates through a pore channel in the fixing clamp until the end head of the displacement sensor LVDT is fixed on the other fixing clamp on the diagonal line; and the ends of the displacement sensors LVDT at the two ends of the displacement sensor LVDT are fixed through bolts to complete installation.
The invention discloses a testing method of a testing device for shear deformation of a core area of a concrete member, which comprises the following steps:
1) the assembled fixing device is stuck to the surface test area of the concrete test piece through glue;
2) the main body rod of the displacement sensor LVDT penetrates through a pore channel in the fixing clamp until the end head of the displacement sensor LVDT is fixed on the other fixing clamp on the diagonal line; the ends of the displacement sensors LVDT at the two ends of the displacement sensor LVDT are fixed through bolts;
3) the displacement sensor LVDT is connected with the data acquisition instrument through a data line;
4) repeating the steps to install another set of testing device on the concrete sample; the two sets of testing devices are arranged in a mutually crossing mode;
5) before the test is formally started, in order to enable the LVDT to adapt to the positive stretching and negative compression deformation of the measurement shear deformation area, the end part test thin rod extends out of the displacement sensor LVDT main body rod for a certain distance, and after the test is prepared, the data acquisition instrument is reset;
6) and after the test is started, the data acquisition instrument starts to work and records the deformation value.
Advantageous effects
Aiming at the current situation that the shear deformation of the core area of the concrete member in the existing civil engineering industry is difficult to accurately measure, the test device for accurately measuring the shear deformation of the core area of the concrete member provided by the invention is made of light materials, and is simple and convenient to install. And the phenomenon that the displacement sensor falls off due to the cracking of the concrete in the shearing area can not occur in the loading process, the shearing deformation of the concrete sample can be continuously and accurately measured, and the accuracy of the test value is greatly improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an oblique view of the present invention;
FIG. 3 is a plan view of a fixture of the test fixture of the present invention;
fig. 4 is an elevational view of the fixture of the test apparatus of the present invention.
In the figure: 1-a fixture; 2-displacement transducer LVDT; 3-a data line; 4-502 glue; 5-a data acquisition instrument; 6-upper cover plate; 7-fixing the clamp; 8-side plate; 9-lower cover plate; 10-a slide; 11-rotating the screw; 12-displacement transducer LVDT tip; 13-inner decking.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1 and 2: the test device for accurately measuring the shear deformation of the core area of the concrete member comprises a concrete test piece and a test device. A fixing device 1 is arranged in a shear deformation area for testing the surface of the concrete sample; the fixing device 1 is arranged at the corners of concrete samples such as walls, beam column joints and columns in various forms; the fixing device 1 is used for fixing the displacement sensor LVDT 2; the device is characterized in that the bottom surface of the fixing device 1 is adhered to the surface of a test piece through 502 glue 4.
The deformation displacement value of the test piece measured by the displacement sensor LVDT2 is connected to the data acquisition instrument 5 through the data line 3.
As shown in fig. 3: the fixing device 1 comprises an upper cover plate 6, a fixing clamp 7, a side plate 8, a lower cover plate 9 and a slide way 10.
Both the upper cover plate 6 and the lower cover plate 9 are 1/4 circular rings.
The fixed clamp 7 is arranged in the slideway 10, the two sides of the slideway are coated with lubricating oil, and the opening of the slideway is blocked by the side plate 8 to prevent the fixed clamp 7 from sliding out.
The end part of the side plate 8 is provided with a small-distance L-shaped side plate for playing a certain fixing role.
As shown in fig. 4: the fixing clamp 7 is provided with a rotating screw 11 at one side for screwing to fix the body rod of the displacement sensor LVDT 2.
As shown in fig. 3: the fixing clamp 7 can also be used for fixing the LVDT head 12 of the displacement sensor.
The test device for accurately measuring the shear deformation of the core area of the concrete member is manufactured by the following steps:
1) adopting fixing devices 1 with different sizes to manufacture concrete samples according to different sizes;
2) 4L-shaped side plates 8 with small distances at the end parts are fixed on a lower cover plate 9; a slideway 10 with a certain size is reserved in the middle;
3) and the fixed clamp 7 is arranged in the slideway 10, and lubricating oil is coated on two sides of the slideway.
4) The upper cover plate 6 is fixedly connected with the lower cover plate 9 through an L-shaped side plate 8.
The test device for accurately measuring the shear deformation of the core area of the concrete member comprises the following use method:
1) the lower cover plate 9 of the fixing device 1 is adhered to the test area on the surface of the test piece through 502 glue 4;
2) the LVDT main body rod 2 passes through the inner pore canal of the fixed clamp 7, and the end part test slender rod 12 is fixed on the other fixed clamp 7 on the diagonal;
3) the displacement sensor LVDT is connected with the data acquisition instrument 5 through the data line 3;
4) symmetrically arranging another set of test devices in the test area;
5) before the test is formally started, in order to measure the positive stretching and negative compression deformation of the shear deformation area, the end part test slender rod 12 extends out of the displacement sensor LVDT main body rod 2 for a certain distance, and the data acquisition instrument 5 is reset;
6) and after the test is started, the data acquisition instrument 5 starts to work and records the deformation value.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. Concrete member core space shear deformation's testing arrangement, its characterized in that: the testing device comprises a fixing device and a displacement transducer LVDT; the fixing devices are respectively arranged at four top corners of the concrete sample; the two fixing devices are used for fixing the displacement sensors LVDT, and the displacement sensors LVDT are inserted into the concrete sample in a staggered manner; the fixing device is fixed at the top corner of the concrete sample through glue; and the deformation displacement value of the test piece measured by the displacement sensor LVDT is transmitted to the data acquisition instrument through a data line.
2. The apparatus for testing shear deformation of a core region of a concrete member according to claim 1, wherein: the fixing device comprises an upper cover plate, a fixing clamp, a side plate, a lower cover plate and an inner side plate; the upper cover plate and the lower cover plate are 1/4 arc plates with the same size, two ends of the arc extension of the upper cover plate and the lower cover plate are respectively provided with a side plate, two side ends of the slideway are of an opening structure, and two circumferential arc end surfaces of the upper cover plate and the lower cover plate are of an opening structure; the inner side plate is an 1/4 arc plate with the same length as the upper cover plate and the lower cover plate,
the cover plate is covered with the lower cover plate, two parallel inner side plates are vertically arranged between the upper cover plate and the lower cover plate, and a slide way for the fixing clamp to slide is formed between the two parallel inner side plates.
3. The apparatus for testing shear deformation of a core region of a concrete member according to claim 2, wherein: the fixing clamp is longitudinally arranged in the slide way, two side walls of the slide way are respectively provided with a slide groove, and the fixing clamp slides along the extension length of the slide groove.
4. The apparatus for testing shear deformation of a core region of a concrete member according to claim 2, wherein: the fixed clamp is internally provided with a pore passage through which the displacement sensor LVDT passes, a threaded hole communicated with the pore passage is radially arranged opposite to the pore passage, and a bolt is arranged in the threaded hole and used for abutting against and fixing the shell of the displacement sensor LVDT.
5. The apparatus for testing shear deformation of a core region of a concrete member according to claim 2, wherein: the chute length is 1/2 of the length of the inner side plate.
6. The method of installing a device for testing shear deformation in a core region of a concrete member according to any one of claims 1 to 5, wherein: the test device was mounted as follows:
1) adopting fixing devices with different sizes according to different concrete samples;
for the condition that wall type components need to measure large deformation, a fixing device with a large model number and a displacement transducer LVDT are adopted; for the condition that beam column node type components need to measure small deformation, a fixing device with a small or medium type and a displacement transducer LVDT are adopted;
2) manufacturing an upper cover plate and a lower cover plate with corresponding sizes according to the size of the concrete sample, and fixing 4 pieces of end parts with L-shaped side plates on the lower cover plate; a slideway is reserved between the upper cover plate and the lower cover plate; 1/4 arc inner side plates are arranged on two sides of the slideway;
3) placing the fixed clamp in the slideway in the longitudinal direction, and coating lubricating oil on the inner side of the slideway;
4) fixing the upper cover plate on the lower cover plate, and fixing the upper cover plate and the lower cover plate with each other through a side plate;
5) the main body rod of the displacement sensor LVDT penetrates through a pore channel in the fixing clamp until the end head of the displacement sensor LVDT is fixed on the other fixing clamp on the diagonal line; and the ends of the displacement sensors LVDT at the two ends of the displacement sensor LVDT are fixed through bolts to complete installation.
7. The method for testing a device for testing the shear deformation of a core region of a concrete member according to any one of claims 1 to 5, wherein: the test method is as follows:
1) the assembled fixing device is stuck to the surface test area of the concrete test piece through glue;
2) the main body rod of the displacement sensor LVDT penetrates through a pore channel in the fixing clamp until the end head of the displacement sensor LVDT is fixed on the other fixing clamp on the diagonal line; the ends of the displacement sensors LVDT at the two ends of the displacement sensor LVDT are fixed through bolts;
3) the displacement sensor LVDT is connected with the data acquisition instrument through a data line;
4) repeating the steps to install another set of testing device on the concrete sample; the two sets of testing devices are arranged in a mutually crossing mode;
5) before the test is formally started, in order to enable the LVDT to adapt to the positive stretching and negative compression deformation of the measurement shear deformation area, the end part test thin rod extends out of the displacement sensor LVDT main body rod for a certain distance, and after the test is prepared, the data acquisition instrument is reset;
6) and after the test is started, the data acquisition instrument starts to work and records the deformation value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011247689.XA CN112525727B (en) | 2020-11-10 | 2020-11-10 | Testing device for shear deformation of concrete member core area and mounting and testing method |
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| CN202011247689.XA CN112525727B (en) | 2020-11-10 | 2020-11-10 | Testing device for shear deformation of concrete member core area and mounting and testing method |
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| CN112525727A true CN112525727A (en) | 2021-03-19 |
| CN112525727B CN112525727B (en) | 2022-06-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532370A (en) * | 2021-06-11 | 2021-10-22 | 中国建筑第八工程局有限公司 | Deformation measuring method for bidirectional sheared concrete member |
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| CN113532370A (en) * | 2021-06-11 | 2021-10-22 | 中国建筑第八工程局有限公司 | Deformation measuring method for bidirectional sheared concrete member |
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