CN107084880B - A method of measurement reinforcing bar and cement-base composite material bond and anchor property - Google Patents
A method of measurement reinforcing bar and cement-base composite material bond and anchor property Download PDFInfo
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- CN107084880B CN107084880B CN201710413343.4A CN201710413343A CN107084880B CN 107084880 B CN107084880 B CN 107084880B CN 201710413343 A CN201710413343 A CN 201710413343A CN 107084880 B CN107084880 B CN 107084880B
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0092—Visco-elasticity, solidification, curing, cross-linking degree, vulcanisation or strength properties of semi-solid materials
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Abstract
The present invention relates to the measuring methods of a kind of reinforcing bar and cement-base composite material bond and anchor property, belong to building structure determination techniques field, method includes the following steps: the 1) setting of reinforcing bar unsticking section, 2) stickup foil gauge, 3) setting of displacement meter, 4) test load, 5) data processing.Conventional measurement method is to lay displacement meter with special stand at the reinforcing bar under hanging basket lower plate, reinforcing bar unsticking section deflection is subtracted by displacement meter reading to calculate loading end slippage, bracket is erroneous for installation, and displacement meter accuracy of reading is not high, influences the computational accuracy of loading end slippage of reinforced bar amount；Our subtraction unit is simple, easily operated, can in clear view loading procedure reinforcing bar loading end strain, and relatively accurately analyze the slippage of reinforcing bar loading end during loading.
Description
Technical field
The present invention relates to a kind of methods for measuring reinforcing bar and cement-base composite material bond and anchor property, belong to building structure
Determination techniques field.
Background technique
The bond and anchor property of reinforcing bar and cement-base composite material is the basis of reinforcing bar and the design of cement-based material structure, is glued
Knot anchoring property is principally obtaining the cohesive force of reinforcing bar and cement-based material and the relation curve of slippage, analyzes each rank on curve
The damage -form of the characteristics of section and sample.The average relative slippage of reinforcing bar and cement-based material adhesive section, is to pass through loading end
What the slippage for subtracting sample with the average slip amount of free end bar was calculated.
At this stage, the measurement of reinforcing bar and slippage of reinforced bar amount at cement-base composite material adhesive section, common way is to try
Sample surface mount aluminium flake sets up displacement meter at sample, measures the displacement of reinforcing bar loading end and free end；Again in test block surface
Arrange the displacement of displacement meter measurement sample.
But above-mentioned traditional method can only obtain the reading of displacement meter when sample does not crack, and after sample cracking, examination
Sample surface falls off, and the stringer of displacement meter slides, and influences the measurement of displacement meter, and dynamic fatigue is loaded, and sample damages not
Disconnected accumulative, after adding up to a certain extent, sample is destroyed, and also be will affect displacement meter reading, is caused not measure complete power-cunning
Shifting amount curve；And the installation process of displacement meter is more complicated, and holding time is longer.
Power-sliding curve of reinforcing bar and cement-base composite material is the key parameter of structure design, therefore there is an urgent need to one
The bond and anchor property of kind more simple, accurate technique study reinforcing bar and cement-base composite material.
Summary of the invention
Technical problem: the purpose of the present invention is to provide a kind of measurement reinforcing bars and cement-base composite material bond and anchor property
Method, this method can be obtained more complete cohesive force-slippage curve, and install it is simple, it is easy to operate.
Technical solution: of the invention provides a kind of side for measuring reinforcing bar and cement-base composite material bond and anchor property
Method, reinforcing bar runs through cement-based material up and down in the reinforcing bar and cement-base composite material, the steel above cement-based material
Muscle is reinforcing bar free end, and the reinforcing bar below cement-based material is reinforcing bar loading end, the reinforcing bar inside cement-based material
It is followed successively by reinforcing bar unsticking section, reinforcing bar adhesive section and reinforcing bar unsticking section from top to bottom；The measurement of the composite material bond and anchor property
Method the following steps are included:
1) setting of reinforcing bar unsticking section: the length of reinforcing bar unsticking section in label reinforcing bar and cement-base composite material, in reinforcing bar
Unsticking fragment position polyvinyl chloride pipe unsticking；
2) the free elongation of reinforcing bar loading end is measured, foil gauge is uniformly pasted on reinforcing bar loading end, and reserve reinforcing bar
The position of grips；The foil gauge connecting wire to acquire reinforcing bar strain, and surveys its resistance with multimeter, it is ensured that lead
Line and foil gauge welding are normal；
3) setting of displacement meter: marking the length of reinforcing bar grips, i.e. reinforcing bar collet length at reinforcing bar loading end, adjusts
It saves at reinforcing bar clip position to calibration, and clamps reinforcing bar, later the water in reinforcing bar free end and reinforcing bar and cement-base composite material
Displacement meter is installed on the surface of cement-based material respectively, measures reinforcing bar free end travel amount and reinforcing bar and cement base in loading procedure respectively
The relative shift of composite material；
4) test load: reinforcing bar and cement-base composite material being placed in load test equipment and carry out load test, tested
Loading force and reinforcing bar collet displacement are obtained by load test device measuring；The foil gauge and displacement meter are connected to digital collection
On instrument, the frequency acquisition that digital collection instrument is arranged is consistent with test loading force, the frequency of reinforcing bar crosshead travel；
5) data processing:
The sum of all strains of reinforcing bar mean strain=reinforcing bar/foil gauge quantity；
Reinforcing bar loading end slippage=reinforcing bar collet displacement-(the free elongation of reinforcing bar loading end-reinforcing bar collet length
+ reinforcing bar unsticking segment length) × reinforcing bar mean strain；
In reinforcing bar adhesive section reinforcing bar be averaged relative slippage=(reinforcing bar loading end slippage+reinforcing bar free end travel amount)/
The relative shift of 2- reinforcing bar and cement-base composite material obtains power-sliding curve of reinforcing bar and cement-base composite material.
Wherein:
The free elongation that reinforcing bar loading end is measured described in step 2) refers to be added with reinforcing bar before ruler measurement loading experiment
Carry the length at end；The uniform stickup foil gauge refers in the side of reinforcing bar loading end, pastes at interval of 30mm~50mm
BX120-3AA foil gauge.
Reinforcing bar collet length (b) described in step 3) is 50mm~80mm.
The cement-base composite material is concrete or fiber reinforced cement-based composite material.
The reinforcing bar is plain bar or Ribbed Bar.
This method is suitable for reinforcing bar and cement-base composite material static loading is tested or dynamic fatigue load test.
The utility model has the advantages that compared with prior art, the present invention has the advantages that: experimental rig of the invention is simple, operation
It is convenient, cohesive force-sliding curve of complete reinforcing bar and cement-base composite material can be obtained, facilitate analysis and loading each rank
Duan Zhong, the loading characteristic and damage -form of sample.
Detailed description of the invention
Fig. 1 is the load test equipment of reinforcing bar and the test of cement-base composite material bond-anchorage；
Fig. 2 is the load test equipment partial enlarged view of reinforcing bar and the test of cement-base composite material bond-anchorage；
Fig. 3 is that bar diameter is 12mm in example 1, and bonding segment length is 36mm, and reinforcing bar and cement-base composite material glue
Tie power-slippage curve graph；
Fig. 4 is that bar diameter is 12mm in example 2, and bonding segment length is 48mm, and reinforcing bar and cement-base composite material glue
Tie power-slippage curve graph；
Fig. 5 is that bar diameter is 12mm in example 3, and bonding segment length is 60mm, and reinforcing bar and cement-base composite material glue
Tie power-slippage curve graph；
Have in figure: bolt 1, hanging basket tightening latch 2, hanging basket upper plate 3, hanging basket lower plate 4, reinforcing bar and cement-base composite material 5, reinforcing bar
Free end 6, reinforcing bar loading end 7, polyvinyl chloride pipe 8, reinforcing bar adhesive section 9, steel cushion block 10, displacement meter 11, foil gauge 12, reinforcing bar
Collet 13, conducting wire 14, digital collection instrument 15, reinforcing bar unsticking segment length a, reinforcing bar collet length b, the free elongation of reinforcing bar loading end
c。
Specific embodiment
For a better understanding of the present invention, below with reference to the case study on implementation content that the present invention is furture elucidated, but the present invention
Content be not limited solely to the following examples.
Example 1:
Reinforcing bar of the invention and the improvement simple and easy method of cement-base composite material bond and anchor property measurement are embodied and walk
Suddenly are as follows:
1) reinforcing bar and cement-base composite material 5 of the sample using 150mm, bar diameter 12mm, 9 length of adhesive section are
36mm measures the free elongation c of reinforcing bar loading end, reserves 70mm reinforcing bar collet length b, and make marks, every in residue length
Paste model BX120-3AA foil gauge 12 every 40mm, and welding lead 14 surveys its resistance with multimeter, it is ensured that conducting wire 14 with
Foil gauge 12 welds normally；
2) bolt 1 in load test equipment, hanging basket tightening latch 2 are tightened, guarantees that hanging basket upper plate 3, hanging basket lower plate 4 are in horizontal position
It sets, reinforcing bar and cement-base composite material is installed, adjust 13 distance of reinforcing bar collet, reinforcing bar is clamped to the position of former label, is clamped
Reinforcing bar, it is compound with cement base in reinforcing bar then in the installation displacement meter 11 of reinforcing bar free end 6 to measure 6 displacement of reinforcing bar free end
Displacement meter is installed on the surface of cement-based material in material 5, measures the opposite position of reinforcing bar and cement-base composite material 5 in loading procedure
Shifting amount；
3) reinforcing bar and cement-base composite material 5 are placed in load test equipment and carry out load test, test loading force and
13 displacement of reinforcing bar collet is obtained by load test device measuring；The foil gauge 12 and displacement meter 11 are connected to digital collection instrument
On 15, the frequency acquisition that digital collection instrument 15 is arranged is consistent with the frequency that test loading force, reinforcing bar collet 13 are displaced；By foil gauge
12, displacement meter 11, the displacement of reinforcing bar collet 13 are reset, and are then loaded；
4) after the completion of to be tested, data processing is carried out:
The sum of all strains of reinforcing bar mean strain=reinforcing bar/12 quantity of foil gauge；
Reinforcing bar loading end slippage=13 displacement of reinforcing bar collet-(the free elongation c- reinforcing bar collet of reinforcing bar loading end
Length b+ reinforcing bar unsticking segment length a) × reinforcing bar mean strain；
In reinforcing bar adhesive section 9 reinforcing bar be averaged relative slippage=(reinforcing bar loading end slippage+reinforcing bar free end (6) displacement
Amount)/2- reinforcing bar and cement-base composite material 5 relative shift, ultimate analysis obtains reinforcing bar and cement-base composite material 5
Power-sliding curve.
Example 2:
Reinforcing bar of the invention and the improvement simple and easy method of cement-base composite material bond and anchor property measurement are embodied and walk
Suddenly are as follows:
1) reinforcing bar and cement-base composite material 5 of the sample using 150mm, bar diameter 12mm, 9 length of adhesive section are
48mm measures the free elongation c of reinforcing bar loading end, reserves 80mm reinforcing bar collet length b, and make marks, every in residue length
Paste model BX120-3AA foil gauge 12 every 30mm, and welding lead 14 surveys its resistance with multimeter, it is ensured that conducting wire 14 with
Foil gauge 12 welds normally；
2) bolt 1 in load test equipment, hanging basket tightening latch 2 are tightened, guarantees that hanging basket upper plate 3, hanging basket lower plate 4 are in horizontal position
It sets, reinforcing bar and cement-base composite material is installed, adjust 13 distance of reinforcing bar collet, reinforcing bar is clamped to the position of former label, is clamped
Reinforcing bar, it is compound with cement base in reinforcing bar then in the installation displacement meter 11 of reinforcing bar free end 6 to measure 6 displacement of reinforcing bar free end
Displacement meter is installed on the surface of cement-based material in material 5, measures the opposite position of reinforcing bar and cement-base composite material 5 in loading procedure
Shifting amount；
3) reinforcing bar and cement-base composite material 5 are placed in load test equipment and carry out load test, test loading force and
13 displacement of reinforcing bar collet is obtained by load test device measuring；The foil gauge 12 and displacement meter 11 are connected to digital collection instrument
On 15, the frequency acquisition that digital collection instrument 15 is arranged is consistent with the frequency that test loading force, reinforcing bar collet 13 are displaced；By foil gauge
12, displacement meter 11, the displacement of reinforcing bar collet 13 are reset, and are then loaded；
4) after the completion of to be tested, data processing is carried out:
The sum of all strains of reinforcing bar mean strain=reinforcing bar/12 quantity of foil gauge；
Reinforcing bar loading end slippage=13 displacement of reinforcing bar collet-(the free elongation c- reinforcing bar collet of reinforcing bar loading end
Length b+ reinforcing bar unsticking segment length a) × reinforcing bar mean strain；
In reinforcing bar adhesive section 9 reinforcing bar be averaged relative slippage=(reinforcing bar loading end slippage+reinforcing bar free end (6) displacement
Amount)/2- reinforcing bar and cement-base composite material 5 relative shift, ultimate analysis obtains reinforcing bar and cement-base composite material 5
Power-sliding curve.
Example 3:
Reinforcing bar of the invention and the improvement simple and easy method of cement-base composite material bond and anchor property measurement are embodied and walk
Suddenly are as follows:
1) reinforcing bar and cement-base composite material 5 of the sample using 150mm, bar diameter 12mm, 9 length of adhesive section are
60mm measures the free elongation c of reinforcing bar loading end, reserves 50mm reinforcing bar collet length b, and make marks, every in residue length
Paste model BX120-3AA foil gauge 12 every 50mm, and welding lead 14 surveys its resistance with multimeter, it is ensured that conducting wire 14 with
Foil gauge 12 welds normally；
2) bolt 1 in load test equipment, hanging basket tightening latch 2 are tightened, guarantees that hanging basket upper plate 3, hanging basket lower plate 4 are in horizontal position
It sets, reinforcing bar and cement-base composite material is installed, adjust 13 distance of reinforcing bar collet, reinforcing bar is clamped to the position of former label, is clamped
Reinforcing bar, it is compound with cement base in reinforcing bar then in the installation displacement meter 11 of reinforcing bar free end 6 to measure 6 displacement of reinforcing bar free end
Displacement meter is installed on the surface of cement-based material in material 5, measures the opposite position of reinforcing bar and cement-base composite material 5 in loading procedure
Shifting amount；
3) reinforcing bar and cement-base composite material 5 are placed in load test equipment and carry out load test, test loading force and
13 displacement of reinforcing bar collet is obtained by load test device measuring；The foil gauge 12 and displacement meter 11 are connected to digital collection instrument
On 15, the frequency acquisition that digital collection instrument 15 is arranged is consistent with the frequency that test loading force, reinforcing bar collet 13 are displaced；By foil gauge
12, displacement meter 11, the displacement of reinforcing bar collet 13 are reset, and are then loaded；
4) after the completion of to be tested, data processing is carried out:
The sum of all strains of reinforcing bar mean strain=reinforcing bar/12 quantity of foil gauge；
Reinforcing bar loading end slippage=13 displacement of reinforcing bar collet-(the free elongation c- reinforcing bar collet of reinforcing bar loading end
Length b+ reinforcing bar unsticking segment length a) × reinforcing bar mean strain；
In reinforcing bar adhesive section 9 reinforcing bar be averaged relative slippage=(reinforcing bar loading end slippage+reinforcing bar free end (6) displacement
Amount)/2- reinforcing bar and cement-base composite material 5 relative shift, ultimate analysis obtains reinforcing bar and cement-base composite material 5
Power-sliding curve.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those skilled in the art within the technical scope disclosed by the invention, can without the variation that creative work is expected or
Replacement, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be limited with claims
Subject to fixed protection scope.
Claims (5)
1. a kind of method for measuring reinforcing bar and cement-base composite material bond and anchor property, it is characterised in that: the reinforcing bar and
Reinforcing bar runs through cement-based material up and down in cement-base composite material (5), and the reinforcing bar above cement-based material is that reinforcing bar is free
Hold (6), reinforcing bar below cement-based material is reinforcing bar loading end (7), the reinforcing bar inside cement-based material from upper and
Under be followed successively by reinforcing bar unsticking section, reinforcing bar adhesive section (9) and reinforcing bar unsticking section；The measurement method of the composite material bond and anchor property
The following steps are included:
1) setting of reinforcing bar unsticking section: reinforcing bar unsticking segment length (a) in label reinforcing bar and cement-base composite material (5), in reinforcing bar
Unsticking fragment position polyvinyl chloride pipe (8) unsticking；
2) paste foil gauge (12): the measurement free elongation (c) of reinforcing bar loading end is uniformly pasted on reinforcing bar loading end (7) and is answered
Become piece (12), and reserves the position of reinforcing bar collet (13) clamping；Foil gauge (12) connecting wire (14), to acquire steel
Muscle strain；
3) length of reinforcing bar collet (13) clamping, i.e. reinforcing bar collet length the setting of displacement meter: are marked at reinforcing bar loading end (7)
(b), it adjusts at reinforcing bar collet (13) position to calibration, and clamps reinforcing bar, later in reinforcing bar free end (6) and reinforcing bar and cement base
Displacement meter (11) are installed on the surface of cement-based material respectively in composite material (5), measure reinforcing bar free end in loading procedure respectively
(6) relative shift of displacement and reinforcing bar and cement-base composite material (5)；
4) test load: reinforcing bar and cement-base composite material (5) being placed in load test equipment and carry out load test, and test adds
It carries power and reinforcing bar collet (13) displacement is obtained by load test device measuring；The foil gauge (12) and displacement meter (11) connection
On digital collection instrument (15), the frequency acquisition and test loading force, reinforcing bar collet (13) that digital collection instrument (15) are arranged are displaced
Frequency it is consistent；
5) data processing:
The sum of all strains of reinforcing bar mean strain=reinforcing bar/foil gauge (12) quantity；
Reinforcing bar loading end slippage=reinforcing bar collet (13) displacement-(free elongation (c)-reinforcing bar collet of reinforcing bar loading end
Length (b)+reinforcing bar unsticking segment length (a)) × reinforcing bar mean strain；
In reinforcing bar adhesive section (9) reinforcing bar be averaged relative slippage=(reinforcing bar loading end slippage+reinforcing bar free end (6) displacement
Amount)/2- reinforcing bar and cement-base composite material (5) relative shift, obtain power-cunning of reinforcing bar Yu cement-base composite material (5)
Move curve；
Wherein: the free elongation (c) of measurement reinforcing bar loading end described in step 2) refers to reinforcing bar before ruler measurement loading experiment
The length of loading end (7)；The uniform stickup foil gauge refers in the side of reinforcing bar loading end (7), at interval of 30mm~
50mm pastes BX120-3AA foil gauge (12).
2. a kind of method for measuring reinforcing bar and cement-base composite material bond and anchor property as described in claim 1, feature
Be: reinforcing bar collet length (b) described in step 3) is 50mm~80mm.
3. a kind of method for measuring reinforcing bar and cement-base composite material bond and anchor property as described in claim 1, feature
Be: the cement-base composite material (5) is concrete or fiber reinforced cement-based composite material.
4. a kind of method for measuring reinforcing bar and cement-base composite material bond and anchor property as described in claim 1, feature
Be: the reinforcing bar is plain bar or Ribbed Bar.
5. a kind of method for measuring reinforcing bar and cement-base composite material bond and anchor property as described in claim 1, feature
Be: this method is suitable for reinforcing bar and the test of cement-base composite material (5) static loading or dynamic fatigue load test.
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108548713B (en) * | 2018-03-29 | 2022-10-04 | 合肥工业大学 | Correctable mobile test device and test method thereof |
| CN108871929B (en) * | 2018-07-05 | 2021-01-12 | 广西大学 | Test method for testing bonding slippage performance of steel bar-concrete |
| CN112816288A (en) * | 2021-01-07 | 2021-05-18 | 郑州大学 | Method for enhancing bonding property of geopolymer composite material and reinforcing steel bar |
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| JP2011047687A (en) * | 2009-08-25 | 2011-03-10 | Nichiyu Giken Kogyo Co Ltd | Tensile load recording device |
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