CN106546487A - Avoid the concrete material direct tensile test device and test method of eccentric tension - Google Patents
Avoid the concrete material direct tensile test device and test method of eccentric tension Download PDFInfo
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- CN106546487A CN106546487A CN201610924057.XA CN201610924057A CN106546487A CN 106546487 A CN106546487 A CN 106546487A CN 201610924057 A CN201610924057 A CN 201610924057A CN 106546487 A CN106546487 A CN 106546487A
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- latch closure
- screw rod
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- force snesor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The invention provides a kind of concrete material direct tensile test device and test method for avoiding eccentric tension, the experimental rig includes electro-hydraulic servo universal testing machine, chuck, screw rod, force snesor, load Acquisition Instrument, latch closure, strength rib, concrete sample, steel plate, binding agent；Latch closure is to be interlocked to form by two annulus, the latch closure one end on top is tightened in the upper grip of electro-hydraulic servo universal testing machine by screw rod, and force snesor is housed in the middle part of screw rod, the other end of latch closure is tightly connected with strength rib by bolt, and strength rib is welded together with steel plate；The present invention can be prevented effectively from and be acted directly on test specimen due to fixture, produce lateral pressure, cause experimental result inaccurate, flexible buckle structure efficiently solves the eccentric force produced during the direct tension of test specimen, the presence of strength rib also makes being more uniformly stressed for test specimen two ends, makes experimental result more accurate.
Description
Technical field
The invention belongs to Analysis of Concrete Tensile experimental technique field, more particularly to a kind of concrete material for avoiding eccentric tension
Direct tensile test device and test method.
Background technology
The tensile strength of concrete is an important mechanical index, in the past in research Analysis of Concrete Tensile characteristic, it is determined that anti-
During tensile strength, the test method for generally adopting can be divided into two classes：One is Direct Determination, i.e., direct tension test method(s)；Two are
Indirect determination method, including splitting test method, cripping test method.Most common of which is splitting test method, but substantial amounts of experiment
Outcome research shows that the tensile strength that can not truly reflect concrete is sent out in splitting, has the tensile strength that splitting test method is obtained
The result obtained with direct tensile test method has larger discrepancy, and in most cases split the law experimental result is less than uniaxial direct tensile method
Experimental result.To meet test requirements document, more accurate tensile strength is obtained, direct tensile test is carried out to concrete sample is
It is very necessary.
It is uniformly distributed ensureing test specimen axial tension and stress using a kind of simple method in direct tensile test
It is particularly important.The concrete uniaxial direct tensile test specimen for adopting at present, can be divided into external clamping, built-in type and adhesive type.External clamping one
As easily produce stress concentration in holding position, for the inorganic fragile material of such as coagulation great soil group, rupture and easily betide holding position, very
It is difficult to ensure that card fracture is betided at the homogeneous state of stress, and built-in type is it is difficult to ensure that stress distribution is same in test specimen axial tension, and test specimen
It is complex.Adhesive type is relatively simple to guarantee axial tension that two ways is uniform earlier above for stress distribution in test specimen, and fracture is sent out
Life is higher in the probability of homogeneous state of stress section, but there is also the uneven phenomenon of stress distribution.It can be seen that, above method is all present each
Defect, all can not meet the requirement of direct tensile test well, study a kind of concrete material for avoiding eccentric tension straight
Connecing tensile test apparatus and its method has important using value.
The content of the invention
It is an object of the present invention to provide a kind of concrete material direct tensile test device for avoiding eccentric tension, should
Device is solved in Analysis of Concrete Tensile test, as stress concentration and eccentric tension cause experimental result larger with actual value deviation
Problem, another purpose is to provide the testing program of the uniaxial direct tensile experimental provision.
For achieving the above object, the technical solution used in the present invention is：
A kind of concrete material direct tensile test device for avoiding eccentric tension, including electro-hydraulic servo universal testing machine, it is described
Electro-hydraulic servo universal testing machine includes upper grip set up and down 1 and lower chuck 9, the experimental rig also include upper screw rod 2,
Lower screw rod 8, force snesor 3, load Acquisition Instrument 10, upper latch closure 4, lower latch closure 7, strength rib 5, steel plate 11 and concrete sample 6；Institute
The upper and lower ends for stating concrete sample 6 each connect strength rib 5, the strength rib 5 above concrete sample 6 by steel plate 11 respectively
The bottom of the upper latch closure 4 of top connection, the bottom of the top of the upper latch closure 4 by the upper screw rod 2 of the connection of force snesor 3, it is described on
The top connection upper grip 1 of screw rod 2；The force snesor 3 is connected with load Acquisition Instrument 10；Below concrete sample 6
The top of the lower latch closure 7 of 5 bottom of strength rib connection, the top of the lower screw rod 8 of bottom connection of the lower latch closure 7, the bottom of the lower screw rod 8
End connection lower chuck 9.
Further, the upper and lower ends of the concrete sample 6 are closely connected with one block of steel plate 11 by adhesive 12 respectively
Connect, on two blocks of steel plates 11, weld energetically rib 5, the strength rib 5 is respectively by the connection of bolt 13 above concrete sample
Upper latch closure 4 and it is located at lower latch closure 7 below concrete sample.
Further, the upper latch closure 4 and lower latch closure 7 include the two diameter identical annulus for interlocking mutually.
Further, 4 top of upper latch closure connects force snesor 3 by bolt 13.
Further, the top of the upper screw rod 2 is tightened on the upper grip 1 of electro-hydraulic servo universal testing machine, the lower spiral shell
The bottom of bar 8 is tightened on electro-hydraulic servo universal testing machine lower chuck 9.
Preferably, the binding agent 12 is high-strength epoxy resin glue.
A kind of test method of the concrete material direct tensile test device for avoiding eccentric tension, it is characterised in that bag
Include following steps：
A, the two ends that two pieces of strength ribs with steel plate are bonded in concrete sample by binding agent, to be bonded dose of intensity play completely
Afterwards, two pieces of strength ribs with steel plate are separately fixed at one end of upper latch closure 4 and lower latch closure 7 with bolt；
B, the other end of upper latch closure is fixed by bolts on force snesor, force snesor is another to be terminated on screw rod；
C, upper screw rod is clamped in upper grip；
D, the other end of lower latch closure is clamped in lower chuck by lower screw rod；
E, load Acquisition Instrument is connected to into force snesor centre position；
F, adjust electro-hydraulic servo universal testing machine position after, then apply pretightning force, proceed by tension test, until coagulation
Native test specimen destruction.
Preferably, the binding agent is high-strength epoxy resin glue.
Compared with prior art, the present invention has advantages below：
（1）Buckle structure is introduced in the present invention innovatively, compared to the spherical hinge structure in conventional tension test, buckle structure has
Greater flexibility, when can apply pretightning force in process of the test, makes test specimen naturally droop by Action of Gravity Field, it is to avoid stretching
During test, eccentric force acts on concrete sample so that experimental result is more accurate.
（2）The strength rib that the present invention is adopted, contributes to the uniform tension of test specimen two ends, and in improving conventional tension test, two ends should
The situation that power is concentrated.
（3）The present invention uses adhesive type stretching concrete sample, i.e., viscous with binding agent at the two ends of concrete sample
The steel plate of knot strength rib, is compared to built-in type tensile test specimen and clipping tensile test specimen, and it is easier to guarantee axial tension, stress
It is uniformly distributed, occurs fracture higher in the probability of homogeneous state of stress section, meet the requirement of direct tensile test well.
（4）Buckle structure in the present invention, in being prevented effectively from drawing process, loading direction deviates in concrete sample
The problem of heart line.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of strength rib in the present invention；
Fig. 3 is the structural representation of upper latch closure in the present invention；
Fig. 4 is the structural representation of lower latch closure in the present invention；
Wherein：1- upper grips, the upper screw rods of 2-, 3- force snesors, the upper latch closures of 4-, 5- strength ribs, 6- concrete samples, latch closure under 7-,
Screw rod under 8-, 9- lower chucks, 10- load Acquisition Instruments, 11- steel plates, 12- binding agents, 13- bolts.
Specific embodiment
The present invention is further described with reference to embodiment.
As shown in figure 1, a kind of concrete material direct tensile test device for avoiding eccentric tension, including electro-hydraulic servo ten thousand
Energy testing machine, the electro-hydraulic servo universal testing machine include upper grip set up and down 1 and lower chuck 9, the experimental rig
Also include upper screw rod 2, lower screw rod 8, force snesor 3, load Acquisition Instrument 10, upper latch closure 4, lower latch closure 7, strength rib 5, steel plate 11 and mix
Solidifying soil test specimen 6；The upper and lower ends of the concrete sample 6 each connect strength rib 5 by steel plate 11 respectively, try positioned at concrete
The bottom of the upper latch closure 4 of 5 top of strength rib connection above part 6, the top of the upper latch closure 4 is by the upper screw rod 2 of the connection of force snesor 3
Bottom, the upper screw rod 2 top connection upper grip 1；The force snesor 3 is connected with load Acquisition Instrument 10；Positioned at coagulation
The top of the lower latch closure 7 of 5 bottom of strength rib connection below native test specimen 6, the top of the lower screw rod 8 of bottom connection of the lower latch closure 7, institute
State the bottom connection lower chuck 9 of lower screw rod 8.Steel plate 11 of the concrete sample two ends by binding agent 12 with two ends is combined closely,
Steel plate 11 is welded on strength rib 5, and the strength rib 5 of upper end is by, on the upper latch closure 4 of the connection of bolt 13, buckle structure is by two diameter phases
Same annulus interlocks what is formed, and the upper end of latch closure is connected to screw rod 2, and upper screw rod is tightened on electro-hydraulic servo universal testing machine and presss from both sides
1, force snesor 3 is housed in the middle part of upper screw rod 2, force snesor is connected on 10 on load Acquisition Instrument, 10 can be with standard on load Acquisition Instrument
STRESS VARIATION in process of the test is measured really；The strength rib of lower end is connected on lower latch closure 7 again by bolt 13, lower latch closure 7
Lower screw rod 8 is connected to, lower screw rod is tightened on electro-hydraulic servo universal testing machine lower chuck 9.
As shown in Fig. 2 upper latch closure 4 is to be interlocked to form by two same annulus, the two ends end of upper latch closure 4 is provided with bolt
13, one end is connected on strength rib 5, and one end is connected on force snesor 3.
As shown in figure 3, lower latch closure 7 is also to be interlocked to form by two same annulus, one end of lower latch closure 7 is provided with bolt
13, for connecting strength rib 5, the other end is provided with lower screw rod 8, for being clamped by lower chuck 9.Upper latch closure（4）, lower latch closure（7）By
Two identical annulus interlock the structure to be formed, and its flexible structure produces eccentric force in effectively prevent tension test.
As shown in figure 4, one end welding steel 11 of the strength rib 5 near concrete sample 6.
The upper and lower ends of the concrete sample 6 are closely connected with one block of steel plate 11 by adhesive 12 respectively, two blocks of steel
Energetically rib 5, the strength rib 5 upper latch closure 4 He respectively by bolt 13 connection positioned at concrete sample above are welded on plate 11
The lower latch closure 7 below concrete sample.
The top of the upper screw rod 2 is tightened on the upper grip 1 of electro-hydraulic servo universal testing machine, the bottom of the lower screw rod 8
It is tightened on electro-hydraulic servo universal testing machine lower chuck 9.
The binding agent is high-strength epoxy resin glue, and concrete sample two ends are close-coupled at steel plate 11 by adhesive 12
On, steel plate is welded on strength rib 5, and the presence of strength rib 5 has for uniformly by pulling force, the generation homogeneous state of stress.
A kind of test method of the concrete material direct tensile test device for avoiding eccentric tension, it is characterised in that bag
Include following steps：
A, the two ends that two pieces of strength ribs with steel plate are bonded in concrete sample by binding agent, to be bonded dose of intensity play completely
Afterwards, two pieces of strength ribs with steel plate are separately fixed at one end of upper latch closure 4 and lower latch closure 7 with bolt；
B, the other end of upper latch closure is fixed by bolts on force snesor, force snesor is another to be terminated on screw rod；
C, upper screw rod is clamped in upper grip；
D, the other end of lower latch closure is clamped in lower chuck by lower screw rod；
E, load Acquisition Instrument is connected to into force snesor centre position；
F, adjust electro-hydraulic servo universal testing machine position after, then apply pretightning force, proceed by tension test, until coagulation
Native test specimen destruction.
The invention provides a kind of concrete material direct tensile test device and test method for avoiding eccentric tension, institute
State experimental rig include electro-hydraulic servo universal testing machine, chuck, screw rod, force snesor, load Acquisition Instrument, buckle structure, strength rib,
Concrete sample, steel plate, binding agent.Buckle structure is to be interlocked to form by two annulus, and the latch closure one end on top is revolved by screw rod
Tightly in the upper grip of electro-hydraulic servo universal testing machine, and force snesor is housed in the middle part of screw rod, the other end of latch closure passes through spiral shell
Bolt is tightly connected with strength rib, and strength rib is welded together with steel plate；Equally, latch closure one end of bottom is tightened on electro-hydraulic watching by screw rod
Take in the lower chuck of universal testing machine, the other end is tightly connected with strength rib by bolt, and strength rib is welded together with steel plate.Coagulation
Native test specimen is placed between upper and lower two blocks of steel plates and is bonded together by strong binder-reinforced.The present invention can be prevented effectively from due to folder
Tool is acted directly on test specimen, is produced lateral pressure, is caused experimental result inaccurate, and flexible buckle structure is efficiently solved
The eccentric force produced during the direct tension of test specimen, the presence of strength rib also make being more uniformly stressed for test specimen two ends, tie experiment
Fruit is more accurate.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of concrete material direct tensile test device for avoiding eccentric tension, including electro-hydraulic servo universal testing machine, institute
Stating electro-hydraulic servo universal testing machine includes upper grip set up and down and lower chuck, it is characterised in that：The experimental rig is also
Including upper screw rod, lower screw rod, force snesor, load Acquisition Instrument, upper latch closure, lower latch closure, strength rib, steel plate and concrete sample；Institute
The upper and lower ends for stating concrete sample each connect strength rib by steel plate respectively, and the strength rib top above concrete sample connects
The bottom of latch closure is connected, the top of the upper latch closure connects the bottom of upper screw rod, the top of the upper screw rod by force snesor
Connection upper grip；The force snesor is connected with load Acquisition Instrument；The lower ring of strength rib bottom connection below concrete sample
The top of button, the top of the lower screw rod of bottom connection of the lower latch closure, the bottom connection lower chuck of the lower screw rod.
2. the concrete material direct tensile test device for avoiding eccentric tension according to claim 1, it is characterised in that：
The upper and lower ends of the concrete sample are closely connected with one block of steel plate by adhesive respectively, are welded energetically on two blocks of steel plates
Rib, the strength rib are bolted the upper latch closure above concrete sample respectively and are located at below concrete sample lower ring
Button.
3. the concrete material direct tensile test device for avoiding eccentric tension according to claim 1, it is characterised in that：
The upper latch closure and lower latch closure include the two diameter identical annulus for interlocking mutually.
4. the concrete material direct tensile test device for avoiding eccentric tension according to claim 1, it is characterised in that：
The upper latch closure top is bolted force snesor.
5. the concrete material direct tensile test device for avoiding eccentric tension according to claim 1, it is characterised in that：
The top of the upper screw rod is tightened on the upper grip of electro-hydraulic servo universal testing machine, and the bottom of the lower screw rod is tightened on electro-hydraulic watching
Take universal testing machine lower chuck.
6. the concrete material direct tensile test device for avoiding eccentric tension according to claim 2, it is characterised in that：
The binding agent is high-strength epoxy resin glue.
7. the test according to the arbitrary described concrete material direct tensile test device for avoiding eccentric tension of claim 1-6
Method, it is characterised in that comprise the following steps：
A, the two ends that two pieces of strength ribs with steel plate are bonded in concrete sample by binding agent, to be bonded dose of intensity play completely
Afterwards, two pieces of strength ribs with steel plate are separately fixed at into upper latch closure with bolt（4）With one end of lower latch closure；
B, the other end of upper latch closure is fixed by bolts on force snesor, force snesor is another to be terminated on screw rod；
C, upper screw rod is clamped in upper grip；
D, the other end of lower latch closure is clamped in lower chuck by lower screw rod；
E, load Acquisition Instrument is connected to into force snesor centre position；
F, adjust electro-hydraulic servo universal testing machine position after, then apply pretightning force, proceed by tension test, until coagulation
Native test specimen destruction.
8. the test method of the concrete material direct tensile test device for avoiding eccentric tension according to claim 7,
It is characterized in that：The binding agent is high-strength epoxy resin glue.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610924057.XA CN106546487A (en) | 2016-10-24 | 2016-10-24 | Avoid the concrete material direct tensile test device and test method of eccentric tension |
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| CN201610924057.XA CN106546487A (en) | 2016-10-24 | 2016-10-24 | Avoid the concrete material direct tensile test device and test method of eccentric tension |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389451A (en) * | 2017-08-30 | 2017-11-24 | 广州大学 | A kind of bitumastic tension test platform for eliminating eccentric bending moment and its test method |
| CN107748108A (en) * | 2017-10-16 | 2018-03-02 | 河海大学 | It is a kind of to determine experimental rig and the method for testing that Analysis of Concrete Tensile is crept |
| CN107817172A (en) * | 2017-09-18 | 2018-03-20 | 华南理工大学 | A kind of anti-eccentric loading clamp of double-shear experiment holds device and method |
| CN108918256A (en) * | 2018-05-24 | 2018-11-30 | 郑州大学 | High-hardness stainless steel fringe enhances ECC direct tensile test fixture and test method |
| CN109991074A (en) * | 2019-04-30 | 2019-07-09 | 中国水利水电第十二工程局有限公司 | Stretch special fixture |
| CN110196225A (en) * | 2019-06-25 | 2019-09-03 | 河南理工大学 | A kind of rock and gunite concrete contact surface adhesion strength test device and test method |
| CN110220791A (en) * | 2019-05-30 | 2019-09-10 | 浙江工业大学 | A kind of cylindrical concrete component axial direction tensile test apparatus |
| CN112658306A (en) * | 2020-11-12 | 2021-04-16 | 珠海格力电器股份有限公司 | Automatic hydro-cylinder connection structure and digit control machine tool of eccentric power adjust |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389451A (en) * | 2017-08-30 | 2017-11-24 | 广州大学 | A kind of bitumastic tension test platform for eliminating eccentric bending moment and its test method |
| CN107817172A (en) * | 2017-09-18 | 2018-03-20 | 华南理工大学 | A kind of anti-eccentric loading clamp of double-shear experiment holds device and method |
| CN107748108A (en) * | 2017-10-16 | 2018-03-02 | 河海大学 | It is a kind of to determine experimental rig and the method for testing that Analysis of Concrete Tensile is crept |
| CN108918256A (en) * | 2018-05-24 | 2018-11-30 | 郑州大学 | High-hardness stainless steel fringe enhances ECC direct tensile test fixture and test method |
| CN109991074A (en) * | 2019-04-30 | 2019-07-09 | 中国水利水电第十二工程局有限公司 | Stretch special fixture |
| CN110220791A (en) * | 2019-05-30 | 2019-09-10 | 浙江工业大学 | A kind of cylindrical concrete component axial direction tensile test apparatus |
| CN110220791B (en) * | 2019-05-30 | 2024-03-22 | 浙江工业大学 | Axial tensile test device for cylindrical concrete member |
| CN110196225A (en) * | 2019-06-25 | 2019-09-03 | 河南理工大学 | A kind of rock and gunite concrete contact surface adhesion strength test device and test method |
| CN110196225B (en) * | 2019-06-25 | 2022-03-01 | 河南理工大学 | Device and method for testing bonding strength of rock and sprayed concrete contact surface |
| CN112658306A (en) * | 2020-11-12 | 2021-04-16 | 珠海格力电器股份有限公司 | Automatic hydro-cylinder connection structure and digit control machine tool of eccentric power adjust |
| CN112658306B (en) * | 2020-11-12 | 2024-05-24 | 珠海格力电器股份有限公司 | Oil cylinder connecting structure capable of automatically adjusting eccentric force and numerical control machine tool |
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Application publication date: 20170329 |