CN108181175A - A kind of device and method for testing eccentric tension concrete durability - Google Patents
A kind of device and method for testing eccentric tension concrete durability Download PDFInfo
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- CN108181175A CN108181175A CN201810101274.8A CN201810101274A CN108181175A CN 108181175 A CN108181175 A CN 108181175A CN 201810101274 A CN201810101274 A CN 201810101274A CN 108181175 A CN108181175 A CN 108181175A
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- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims description 8
- 238000005452 bending Methods 0.000 claims abstract description 26
- 150000003839 salts Chemical class 0.000 claims abstract description 24
- 238000010257 thawing Methods 0.000 claims abstract description 19
- 239000002689 soil Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000003628 erosive effect Effects 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 239000012267 brine Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012669 compression test Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
-
- 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
- G01N3/18—Performing tests at high or low temperatures
-
- 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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
-
- 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
-
- 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
- G01N2203/0023—Bending
-
- 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
- G01N2203/0026—Combination of several types of applied forces
-
- 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
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/0242—With circulation of a fluid
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses it is a kind of test eccentric tension concrete durability device, including：Testing stand；The reaction frame being fixed on testing stand, reaction frame sidewall symmetry are equipped with two pieces of fixed blocks, the lateral load bar moved up and down along reaction frame are equipped with below fixed block；Tensioning system, it is divided into tensioning member and next drawing part, with fixed at the top of reaction frame, next drawing part lower end is fixed with lateral load bar for upper tensioning member upper end, upper tensioning member lower end is fixed with next drawing part upper end with concrete sample, and jack is symmetrical arranged between fixed block and lateral load bar；The bending loading system being fixed on reaction frame side wall；The condition test circulatory system, for providing concrete sample experimental enviroment；Data acquisition controller.Tested using the device of the invention, there is the features such as true and accurate, simple operable, cheap, to greatest extent close to electric power pylon concrete pipe base salt lose or freezing-thawing under bear to stretch the operating mode with wind action simultaneously.
Description
Technical field
The present invention relates to concrete strength and durability test field, more particularly, to a kind of test eccentric tension concrete
The device and method of durability.
Background technology
There is the soil of the length and breadth of land and abundant wind resource, transmission line of electricity to pass through gobi, oasis and be transported to the energy in Xinjiang
Local huge numbers of families are transported to interior ground big city small town.The conveying of electric power energy be unable to do without electric power pylon, supports the mixed of electric power pylon
The long-term security of solidifying soil stake is directly related to the safety of electric power pylon and entire transmission line of electricity.Support steel tower concrete-pile by
It is bent in horizontal wind excitation, while the concrete-pile of windward side bears stretching action due to the trend of toppling over of steel tower, that is, supports
The part pile foundation of steel tower bears eccentric tension effect.Moreover, Xinjiang earth's surface salination is serious, annual salt erosion causes a large amount of bases to set
Apply damage.
In addition to this, Xinjiang belongs to seasonal frost region, and winter surface temperature is below the freezing point, and the water in concrete voids becomes ice crystal
Volume expansion, while the ice crystal into concrete of the non-freeze water outside concrete migrates, and leads to the ice crystal in concrete hollow gap
Volume increased dramatically, and ice crystal volume increased dramatically generates huge splitting power in inside concrete, show that macroscopic view is improved quality damage
It loses, integrality declines, and strength reduction, summer temp warms, and ice crystal disappears, in cycles, research shows that moisture supplement is frost heave
The main reason for, every year since freeze thawing causes a large amount of infrastructure to be damaged.
It can be used for test coagulation earth salt erosion durability instrument and equipment many both at home and abroad at present, the equipment for testing concrete strength
Also it has been reported that.But it for Xinjiang special region condition and the loading characteristic of column foot, that is, tests eccentric under salt erosion or freezing-thawing
The experimental rig and method of tension concrete durability but rarely have people's research.
Invention content
The present invention provides a kind of device and method for testing eccentric tension concrete durability, with true and accurate, simply
It is operable, it is cheap the features such as, approach to greatest extent electric power pylon concrete pipe base salt erosion or freezing-thawing under simultaneously
Bear to stretch with the operating mode of wind load, to bear larger wind load and salinized soil or frozen soil blazon the electric power pylon concrete in area
The research of pile foundation provides technical support and theoretical direction.
A kind of device for testing eccentric tension concrete durability, including：
Testing stand；
Reaction frame is fixed on testing stand, and reaction frame sidewall symmetry is equipped with two pieces of fixed blocks, is equipped with below the fixed block
The lateral load bar moved up and down along reaction frame；
Tensioning system, is divided into tensioning member and next drawing part, and the upper tensioning member upper end is described with fixed at the top of reaction frame
Next drawing part lower end is fixed with lateral load bar, and the upper tensioning member lower end is equipped with adhesive panel with next drawing part upper end, described
The first jack is symmetrical arranged between fixed block and lateral load bar；
Loading system is bent, mounted on reaction frame side wall, for providing bending load to concrete sample；
The condition test circulatory system, for providing the experimental enviroment of concrete sample；
Data acquisition controller is electrically connected with tensioning system and alternating bending system；
The bending loading system includes：
Second jack, the second pressure sensor being fixed between the second very heavy top/bottom part and reaction frame side wall, is used for
The test specimen retainer ring of fixing concrete test specimen, top and the test specimen retainer ring of second jack offset.
The present invention is by tensioning system, bending loading system synergistic effect so that it can act on concrete sample simultaneously
On bear to stretch simultaneously to reach simulation concrete, the operating mode of bending load.
Preferably, the upper tensioning member upper end, by fixed at the top of flexural pivot and reaction frame, the next drawing part lower end leads to
Flexural pivot is crossed to fix with lateral load bar.
Preferably, the adhesive panel can be copper coin, when experiment, will paste copper coin with high-strength resin glue and be fixed on coagulation
Native test specimen upper and lower end face.Copper coin is pasted by setting, active force during stretching is made more uniformly to act on concrete surface.
Preferably, the upper tensioning member lower end, next drawing part upper end are arranged symmetrically bolt by 8 and paste copper coin
It is fixed.
Preferably, being equipped with first pressure sensor between the jack and lateral load bar, the first pressure passes
Sensor is electrically connected with data acquisition controller.
By adjusting the first jack, lateral load bar moving up and down is moved down, concrete sample is generated
Axial tension acts on, and the axial tension action intensity of concrete sample is measured by first pressure sensor.
The present invention provides power using the second jack for concrete sample bending, and the second jack acts on test specimen and fixes
Ring, can not only ensure power it is effective transmit but also can prevent the second jack from directly acting on concrete sample stress concentration is caused to cause
Concrete sample destroy.The size of bending load is measured by second pressure sensor values.
In apparatus of the present invention, the condition test circulatory system can be that salt loses system, and salt erosion system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with brine, is connected with rubber sleeve, and it is not high in invading for concrete sample to adjust brine by air inlet pipe
Degree.
Concrete sample upper and lower ends prevent brine from leaking out using seal with elastometic washer, and Markov bottle fills for use brine and rubber
Set is connected, and provides concrete sample constant salt and loses water level, concrete sample salt erosion water level above section utilizes the capillary of sandy soil
Effect carries out salt erosion, and true environment is simulated to greatest extent with this.
Preferably, the condition test circulatory system can also be freezing and thawing system, the freezing and thawing system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with pure water, is connected with rubber sleeve, and it is not high in invading for concrete sample to adjust pure water by air inlet pipe
Degree；
Freezing-thawing chamber wraps up the testing stand, reaction frame, tensioning system and bending loading system to provide freeze thawing
Environment.
Test eccentric tension concrete durability described in any of the above-described technical solution is utilized the present invention also provides a kind of
The method that device is tested, includes the following steps：
Step 1, tensioning system, bending loading system and the condition test circulatory system cooperate, and concrete sample is consolidated
It is scheduled in reaction frame；
Step 2, simultaneous equal adjusts the first jack in tensioning system, and lateral load bar is pushed to move down and forces its drawing
Stretch concrete sample, when data acquisition controller collect pulling force reach setting numerical value when stop loading, at this moment concrete axial to
Tensile stress is：
Wherein, σ1For concrete sample axial tension stress, F1The first jack pair for data acquisition controller acquisition is lateral
The thrust of load bar, A are concrete sample area of section；
Step 3, adjust bending loading system in the second jack, push test specimen retainer ring, make concrete sample by
Eccentricity pressure stops loading when data collector is collected when pressure reaches setting numerical value, then the second jack pair concrete tries
Part apply moment be：
Wherein, the Maximum bending moment that M is born for concrete sample, F2Second pressure for data acquisition controller acquisition passes
The pressure value of sensor, L are concrete sample length；
Step 4, experiment is completed concrete sample to take out, is placed on omnipotent concrete compression test and obtains concrete examination
Part axial compressive strength standard value, then calculates cubic compressive strength standard value, and calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1For prism intensity
With the ratio of cube strength, αc2For Brittleness of Concrete coefficient.
The present invention by tensioning system, bending loading system and the condition test circulatory system synergistic effect so that it can
Simultaneously act on concrete sample, to greatest extent close to electric power pylon concrete pipe base salt lose or freezing-thawing under simultaneously
It bears to stretch, the operating mode of wind action；The apparatus structure is simple, is conveniently operated, can be with wide range by adjusting jack
The size for adjusting drawing force and flecition power, acquisition mass data is for researching and analysing, to bear larger wind load and salt
The research that stain soil or frozen soil blazon the electric power pylon concrete pipe base in area provides technical support and theoretical direction.
Description of the drawings
Fig. 1 is the structure diagram that apparatus of the present invention lose system with salt；
Fig. 2 is upper tensioning member and the structure diagram of next drawing part；
Fig. 3 is the structure diagram for being bent loading system；
Fig. 4 is the structure diagram that salt loses system；
Fig. 5 is structure diagram of the apparatus of the present invention with freezing and thawing system.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description：
As shown in Figure 1, a kind of device for testing eccentric tension concrete durability, including testing stand 1, reaction frame 2, stretches
System, bending loading system 3, the condition test circulatory system and data acquisition controller 5.In the present embodiment, condition test cycle
System loses system 4 using salt.Reaction frame 2 is mounted on testing stand 1, and 2 sidewall symmetry of reaction frame is equipped with two pieces of fixed blocks 6, fixed
6 lower section of block is equipped with the lateral load bar 7 that can be moved up and down along reaction frame 2.Tensioning system include upper tensioning member, next drawing part,
First jack 8 and first pressure sensor 9.Upper tensioning member upper end is fixed by flexural pivot 10 and 2 top of reaction frame, lower stretching
9 lower end of part is fixed by flexural pivot 10 and lateral load bar 7, is arranged on after 8 bottom of the first jack installation first pressure sensor 9
Between fixed block 6 and lateral load bar 7, first pressure sensor 9 is electrically connected with data acquisition controller 5.
As shown in Fig. 2, upper tensioning member is symmetrical arranged with next drawing part, upper tensioning member lower part is fixed with next drawing part top
There is power transmission copper coin 11, power transmission copper coin 11 is connected respectively by 8 symmetrical bolts with pasting copper coin 12, and 2 identical glutinous
Copper-surfaced plate 12 pastes concrete sample upper and lower end face respectively by high-strength resin glue.
As shown in figure 3, bending loading system includes the second jack 31, test specimen retainer ring 32 and second pressure sensor
33,31 bottom of the second jack is fixed on after installing second pressure sensor 33 on 2 side wall of reaction frame, second pressure sensor 33
All it is electrically connected with data acquisition controller 5.
Power is provided for concrete sample bending using the second jack 31, the second jack 31, which acts on, is fixed on test specimen
The test specimen retainer ring 32 at middle part can not only ensure that the effective of power transmitted but also can prevent the second jack 31 from directly acting on concrete examination
Part causes stress concentration to cause concrete destruction.The size of load is by being located between the second jack 31 and reaction frame 2
Two pressure sensors 33 measure.
As shown in figure 4, salt erosion system 4 includes sealing rubber ring 41, sandy soil 42, rubber sleeve 43 and Markov bottle 44；Concrete
Test specimen is placed in rubber sleeve 43 and symmetrically filling gap, upper and lower ends are sealed using rubber ring 41 with sandy soil 42, and Markov bottle 44 fills
Full for use brine is connected with rubber sleeve 43.It is not high in invading for concrete sample that brine is adjusted by the air inlet pipe 45 in Markov bottle 44
Degree provides concrete sample constant salt and loses water level, and concrete sample salt erosion water level above section is made using the capillary of sandy soil 42
With salt erosion is carried out, true environment is simulated to greatest extent.
As shown in figure 5, the condition test circulatory system in the experimental rig can also use freezing and thawing system, with being lost using salt
The device of system is compared, and what Markov bottle 44 filled is pure water, and whole for wrapping up equipped with freezing-thawing chamber 13 outside device
A experimental rig is to provide freezing-thawing.44 Markov bottle 44 of Markov bottle is filled for use pure water with rubber sleeve 43 to be connected.Pass through horse
Air inlet pipe 45 on family name's bottle 44 adjusts pure water and invades no height in concrete sample, provides constant water level to concrete sample, mixes
Solidifying soil test specimen water level above section is supplemented using the capillarity of sandy soil 42, and operation freezing-thawing chamber 13 reduces experiment
The temperature of environment simulates true freezing-thawing to greatest extent.
Using the device with salt erosion system, the method for testing eccentric tension concrete durability includes the following steps：
(1) concrete sample to be measured is put into rubber sleeve 43, and is filled out therebetween with the compression of 2cm thickness sandy soil 42
It is real, concrete sample and rubber sleeve 43 are sealed with sealing rubber ring 41；
(2) copper coin 12 of pasting of upper tensioning member lower end and next drawing part upper end is fixed on concrete examination with high-strength resin glue
Part upper and lower end face；It is by flexural pivot 10 that upper tensioning member upper end and 2 top of reaction frame is fixed, next drawing part lower end and lateral load bar
7 fix；
(3) concrete sample of periphery package rubber sleeve 43 is fixed with test specimen retainer ring 32, fixed position is concrete
The intermediate position of test specimen；
(4) installation a thousand pieces of gold top 8 and first pressure sensor 9 between two pieces of fixed blocks 6 and lateral load bar 7, according to curved
The needs of bent load add load adjusting gasket 34 in test specimen retainer ring 32 and flushly mount with electric cylinder 31 and therewith
Two pressure sensors 33；
(5) it will seal and connect with rubber sleeve 43 after perfusion brine in Markov bottle 44, concrete is adjusted by air inlet pipe 45
Test specimen invades no height, invades and does not have above section to carry out water salt supplement by 42 capillarity of sandy soil；
(6) simultaneous equal adjusts the first jack 8 in tensioning system, and lateral load bar 7 is pushed to move down and forces its drawing
Concrete sample is stretched, stops loading when first pressure sensor 9 reaches setting numerical value, at this moment concrete axial tension stress is：
Wherein, σ1For concrete sample axial tension stress, F1Pressure value is shown for first pressure sensor, and A is tried for concrete
Part area of section；
(7) adjust the second jack 31 in bending loading system, push test specimen retainer ring 32, make concrete sample by
Eccentricity pressure stops loading when data collector 5 is collected when pressure reaches setting numerical value, then the second jack 31 is to concrete
Test specimen apply moment be：
Wherein, the Maximum bending moment of bending loading system that M is born for concrete sample, F2It is shown for second pressure sensor
The pressure value shown, L are concrete sample length；
(8) experiment is completed concrete sample to take out, is placed on omnipotent concrete compression test and obtains concrete sample
Axial compressive strength standard value, and suggest that relational expression obtains cubic compressive strength standard value used in engineering practice by specification,
The cubic compressive strength standard value calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1For prism intensity
With the ratio (Code for design of concrete structures GB 50010-2010) of cube strength, αc2For Brittleness of Concrete coefficient (concrete
Code for structural design GB 50010-2010).
Claims (8)
1. a kind of device for testing eccentric tension concrete durability, which is characterized in that including：
Testing stand；
Reaction frame is fixed on testing stand, and reaction frame sidewall symmetry is equipped with two pieces of fixed blocks, is equipped with below the fixed block along anti-
The lateral load bar that power frame moves up and down；
Tensioning system is divided into tensioning member and next drawing part, the upper tensioning member upper end and fixed at the top of reaction frame, the drop-down
It stretches part lower end to fix with lateral load bar, the upper tensioning member lower end is equipped with adhesive panel, the fixation with next drawing part upper end
The first jack is symmetrical arranged between block and lateral load bar；
Loading system is bent, mounted on reaction frame side wall, for providing bending load to concrete sample；
The condition test circulatory system, for providing the experimental enviroment of concrete sample；
Data acquisition controller is electrically connected with tensioning system and bending loading system；
The bending loading system includes：
Second jack, the second pressure sensor being fixed between the second very heavy top/bottom part and reaction frame side wall, for fixing
The test specimen retainer ring of concrete sample, top and the test specimen retainer ring of second jack offset.
2. the device of test eccentric tension concrete durability according to claim 1, which is characterized in that the upper stretching
By fixed at the top of flexural pivot and reaction frame, the next drawing part lower end is fixed by flexural pivot and lateral load bar for part upper end.
3. the device of test eccentric tension concrete durability according to claim 1, which is characterized in that the adhesive panel
For copper coin.
4. the device of test eccentric tension concrete durability according to claim 3, which is characterized in that the upper stretching
Part lower end, next drawing part upper end are arranged symmetrically bolt by 8 and adhesive panel is fixed.
5. the device of test eccentric tension concrete durability according to claim 1, which is characterized in that the jack
First pressure sensor is equipped between lateral load bar, the first pressure sensor is electrically connected with data acquisition controller.
6. the device of test eccentric tension concrete durability according to claim 1, which is characterized in that the condition examination
It tests the circulatory system and loses system for salt, salt erosion system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with brine, is connected with rubber sleeve, and adjust brine by air inlet pipe invades no height in concrete sample.
7. the device of test eccentric tension concrete durability according to claim 1, which is characterized in that the condition examination
The circulatory system is tested as freezing and thawing system, the freezing and thawing system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with pure water, is connected with rubber sleeve, and adjust pure water by air inlet pipe invades no height in concrete sample；
Freezing-thawing chamber wraps up the testing stand, reaction frame, tensioning system and bending loading system to provide freeze thawing ring
Border.
8. a kind of side that device using any one of the claim 1-7 test eccentric tension concrete durabilities is tested
Method, which is characterized in that include the following steps：
Step 1, tensioning system, bending loading system and the condition test circulatory system cooperate, and concrete sample is fixed on
In reaction frame；
Step 2, simultaneous equal adjusts the first jack in tensioning system, and lateral load bar is pushed to move down and forces its stretching mixed
Soil test specimen is coagulated, stops loading when data acquisition controller is collected when pulling force reaches setting numerical value, at this moment concrete axial should to drawing
Power is：
Wherein, σ1For concrete sample axial tension stress, F1The first jack pair is collected for data acquisition controller laterally to load
The thrust of bar, A are concrete sample area of section；
Step 3, the second jack in bending loading system is adjusted, test specimen retainer ring is pushed, makes concrete sample by bias
Pressure stops loading when data collector is collected when pressure reaches setting numerical value, then the second jack pair concrete sample is applied
The moment added is：
Wherein, the Maximum bending moment that M is born for concrete sample, F2Second pressure sensor for data acquisition controller acquisition
Pressure value, L be concrete sample length；
Step 4, experiment is completed concrete sample to take out, is placed on omnipotent concrete compression test and obtains concrete sample axis
Heart compressive strength standard value, then calculates cubic compressive strength standard value, and calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1Be prism intensity with it is vertical
The ratio of cube intensity, αc2For Brittleness of Concrete coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810101274.8A CN108181175B (en) | 2018-02-01 | 2018-02-01 | Device and method for testing durability of eccentric tension concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810101274.8A CN108181175B (en) | 2018-02-01 | 2018-02-01 | Device and method for testing durability of eccentric tension concrete |
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| Publication Number | Publication Date |
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| CN108181175A true CN108181175A (en) | 2018-06-19 |
| CN108181175B CN108181175B (en) | 2024-03-08 |
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| CN201810101274.8A Active CN108181175B (en) | 2018-02-01 | 2018-02-01 | Device and method for testing durability of eccentric tension concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112611638B (en) * | 2020-12-24 | 2022-06-17 | 石家庄铁道大学 | Frozen soil pulling and shearing integrated tester |
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