CN108318338A - A kind of device and method of test stretching and cyclic bending concrete durability - Google Patents
A kind of device and method of test stretching and cyclic bending concrete durability Download PDFInfo
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- CN108318338A CN108318338A CN201810101108.8A CN201810101108A CN108318338A CN 108318338 A CN108318338 A CN 108318338A CN 201810101108 A CN201810101108 A CN 201810101108A CN 108318338 A CN108318338 A CN 108318338A
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000005452 bending Methods 0.000 title claims abstract description 60
- 125000004122 cyclic group Chemical group 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 150000003839 salts Chemical class 0.000 claims abstract description 22
- 238000010257 thawing Methods 0.000 claims abstract description 19
- 239000002689 soil Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 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
- 230000003628 erosive effect Effects 0.000 claims description 7
- 230000008014 freezing Effects 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 6
- 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
- 230000005611 electricity Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012669 compression test Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 230000000694 effects 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 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
- 229910052742 iron Inorganic materials 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
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- 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
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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
- G01N2203/005—Electromagnetic means
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses a kind of tests to stretch the device with cyclic bending concrete durability, 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, upper tensioning member upper end is fixed at the top of reaction frame, and next drawing part lower end is fixed with lateral load bar, 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 cyclic bending 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 reciprocal wind action simultaneously.
Description
Technical field
The present invention relates to concrete strengths and durability test field, more particularly, to a kind of test stretching and cyclic bending
The device and method of concrete 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, the energy is transported in Xinjiang
Local huge numbers of families are also transported to interior ground big city small town.The conveying of electric power energy be unable to do without electric power pylon, supports electric power pylon
The long-term security of concrete-pile is directly related to the safety of electric power pylon and entire transmission line of electricity.Support the concrete-pile of steel tower
Bear the reciprocating (cyclic bending) of wind, while the stake of windward side bears stretching action due to the trend of toppling over of steel tower, that is, props up
The concrete-pile of iron brace tower is axially stretched simultaneously and the coupling of cyclic bending, moreover, Xinjiang earth's surface salination is serious, every year
Salt erosion causes a large amount of infrastructure to be damaged.
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.
At present can be used for both at home and abroad test concrete durability instrument and equipment it is very much, the equipment for testing concrete strength also has
Report.But for the loading characteristic of Xinjiang special region condition and column foot, that is, tests under salt erosion or freezing-thawing and bear to stretch
But rarely has people's research with the experimental rig and method of cyclic bending coupling concrete durability.
Invention content
The present invention provides a kind of device and method of test stretching and cyclic bending concrete durability, has true accurate
Really, simple operable, it is cheap the features such as, lost or freezing-thawing in salt close to electric power pylon concrete pipe base to greatest extent
It is lower to bear to stretch the operating mode with reciprocal wind action simultaneously, for bear larger wind load and salinized soil or frozen soil blazon it is regional
The research of electric power pylon concrete pipe base provides technical support and theoretical direction.
A kind of device of test stretching and cyclic bending 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 fixed at the top of reaction frame, described
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
It is symmetrical arranged jack between fixed block and lateral load bar；
Cyclic bending system is fixed on reaction frame side wall, for providing cyclic bending load to concrete sample；
The condition test circulatory system, the experimental enviroment for providing concrete sample；
Data acquisition controller is electrically connected with tensioning system and cyclic bending system.
The present invention is by tensioning system, the effect of cyclic bending systematic collaboration so that it can act on concrete sample simultaneously
On stretched with reaching simulation concrete while bearing, the operating mode of cyclic bending.
Preferably, the upper tensioning member upper end is by fixed at the top of flexural pivot and reaction frame, the next drawing part lower end is logical
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, the active force of axial tension 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 jack, so that lateral load bar moving up and down is moved down, concrete sample is generated axial
The axial tension action intensity of stretching action, concrete sample is measured by first pressure sensor.
In apparatus of the present invention, the cyclic bending system includes：Electric cylinder；It is fixed on electric cylinder bottom and reaction frame side wall
Between second pressure sensor；It is connect with the telescopic rod at the top of electric cylinder, is used for the test specimen fixed ring of fixing concrete test specimen；
The electric cylinder, second pressure sensor are electrically connected with data acquisition controller.
The present invention provides power, electric cylinder effect using the linear reciprocating motion of electric cylinder for concrete sample cyclic bending
In test specimen fixed ring, it not only can guarantee effective transmission of power but also can prevent electric cylinder from directly acting on concrete sample and caused stress collection
In caused concrete sample destroy.
Preferably, being equipped with load adjusting gasket between the telescopic rod at the top of the electric cylinder and test specimen fixed ring.
Since the displacement of electric cylinder is fixed, the bending of concrete is made to adjust electric cylinder by load adjusting gasket
With gasket is more, and load is bigger.Size is acted on to calculate by the second pressure sensor values between electric cylinder and reaction frame
It obtains.
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, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is 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 providing constant salt to concrete sample loses water level, and concrete sample salt loses the capillary that water level above section utilizes 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, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is 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 cyclic bending system to provide freeze thawing
Environment.
It is resistance to cyclic bending concrete using test stretching described in any of the above-described technical solution that the present invention also provides a kind of
The method that the device of long property is tested, includes the following steps：
Step 1, tensioning system, cyclic bending system and the condition test circulatory system cooperate, and concrete sample is consolidated
It is scheduled in reaction frame；
Step 2, simultaneous equal adjusts jack in tensioning system, pushes lateral load bar to move down and forces its stretching mixed
Solidifying soil test specimen stops load when data acquisition controller collects when pulling force reaches setting numerical value, and at this moment concrete axial is answered to drawing
Power is：
Wherein, σ1For concrete sample axial tension stress, F1The pulling force of tensioning system, A are collected for data acquisition controller
For concrete sample area of section；
Step 3, the linear motion reciprocating frequence that cyclic bending system is controlled by data acquisition controller tries concrete
Part applies cyclic bending load, and by data acquisition controller record load F2, then cyclic bending system concrete sample is applied
The moment added is：
Wherein, M is the cyclic bending Maximum bending moment that concrete sample is born, F2For the past of data acquisition controller acquisition
The pressure value of multiple bending system, L are concrete sample length；
Step 4, concrete sample is completed in experiment 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 the synergistic effect of tensioning system, cyclic bending system and the condition test circulatory system 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 with reciprocal wind action；The apparatus structure is simple, is conveniently operated, by adjusting jack and load tune
Save gasket, can the large range of size for adjusting drawing force and cyclic bending active force, acquisition mass data is for studying
Analysis, to bear larger wind load and salinized soil or frozen soil blazon the research of electric power pylon concrete pipe base in area and provides technology
Support and theoretical direction.
Description of the drawings
Fig. 1 is the structural schematic diagram that apparatus of the present invention lose system with salt；
Fig. 2 is the structural schematic diagram of upper tensioning member and next drawing part；
Fig. 3 is the structural schematic diagram of cyclic bending system；
Fig. 4 is the structural schematic diagram that salt loses system；
Fig. 5 is structural schematic diagram of the apparatus of the present invention with freezing and thawing system.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and detailed description：
As shown in Figure 1, a kind of test stretches the device with cyclic bending concrete durability, including testing stand 1, reaction frame
2, tensioning system, cyclic bending system 3, the condition test circulatory system and data acquisition controller 5.In the present embodiment, condition examination
It tests the circulatory system and system 4 is lost 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
6,6 lower section of fixed block is equipped with can be along the lateral load bar 7 that reaction frame 2 moves up and down.Tensioning system includes upper tensioning member, drop-down
Stretch part, jack 8 and first pressure sensor 9.Upper tensioning member upper end is fixed by flexural pivot 10 and 2 top of reaction frame, drop-down
It stretches 9 lower end of part to fix by flexural pivot 10 and lateral load bar 7, setting is solid after first pressure sensor 9 is installed in 8 bottom of jack
Determine between 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 are power transmission copper coin 11, power transmission copper coin 11 to be connected respectively with copper coin 12 is pasted by 8 symmetrical bolts, 2 identical glutinous
Copper-surfaced plate 12 pastes concrete upper and lower end face respectively by high-strength resin glue.
As shown in figure 3, cyclic bending system includes electric cylinder 31, test specimen fixed ring 32 and second pressure sensor 33,
Be fixed on 2 side wall of reaction frame after 31 bottom of electric cylinder installation second pressure sensor 33, the telescopic rod at 31 top of electric cylinder with
Load adjusting gasket 34 is equipped between test specimen fixed ring 32.Electric cylinder 31, second pressure sensor 33 all with data acquisition control
Device 5 is electrically connected.
Power is provided for concrete sample cyclic bending using the linear reciprocating motion of electric cylinder 31, electric cylinder 31 acts on
The test specimen fixed ring 32 being fixed in the middle part of test specimen not only can guarantee that the effective of power transmitted but also can to prevent electric cylinder 31 from directly acting on mixed
Solidifying soil test specimen causes stress concentration to cause concrete destruction, since the displacement of electric cylinder 31 is fixed, passes through load spacer
Piece 34 acts on the opposite of concrete sample to adjust electric cylinder 31, and gasket is more, and load is bigger.The size of load is by being located at
Second pressure sensor 33 between electric cylinder 31 and reaction frame 2 measures.
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 constant salt to concrete sample and loses water level, and concrete sample salt is lost water level above section and 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, lost with 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 for losing system with salt, test stretches the method with cyclic bending concrete durability, including following step
Suddenly：
(1) concrete sample to be measured is put into rubber sleeve, and is tamped therebetween with 2cm thickness sandy soil compression, used
Sealing rubber ring 41 seals concrete sample and rubber sleeve 43；
(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 fixed 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 past
The needs of multiple bending load size add load adjusting gasket 34 in test specimen fixed ring 32 and flushly mount with electric cylinder 31 therewith
And second pressure sensor 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 sandy soil capillarity；
(6) simultaneous equal adjusts jack 8 in tensioning system, pushes lateral load bar 7 to move down and forces its stretching mixed
Solidifying soil test specimen, stops load, at this moment concrete axial tension stress is when first pressure sensor 9 reaches setting numerical value：
Wherein, σ1For concrete sample axial tension stress, F1Show that pressure value, A are tried for concrete for first pressure sensor
Part area of section；
(7) the linear motion reciprocating frequence that electric cylinder is controlled by data acquisition controller applies back and forth concrete sample
Bending load, and load F is recorded by second pressure sensor 332, then the moment that electric cylinder applies concrete sample is：
Wherein, M is the cyclic bending Maximum bending moment that concrete sample is born, F2The pressure shown for second pressure sensor
Force value, L are concrete sample length；
(8) concrete sample is completed in experiment 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 (10)
1. a kind of test stretches the device with cyclic bending 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 along anti-below the fixed block
The lateral load bar that power frame side wall 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
It is symmetrical arranged jack between block and lateral load bar；
Cyclic bending system is fixed on reaction frame side wall, for providing cyclic bending load to concrete sample；
The condition test circulatory system, the experimental enviroment for providing concrete sample；
Data acquisition controller is electrically connected with tensioning system and cyclic bending system.
2. test according to claim 1 stretches the device with cyclic bending concrete durability, which is characterized in that described
By fixed at the top of flexural pivot and reaction frame, the next drawing part lower end is solid by flexural pivot and lateral load bar for upper tensioning member upper end
It is fixed.
3. test according to claim 1 stretches the device with cyclic bending concrete durability, which is characterized in that described
Adhesive panel is copper coin.
4. test according to claim 1 stretches the device with cyclic bending concrete durability, which is characterized in that described
Upper tensioning member lower end, next drawing part upper end are arranged symmetrically bolt by 8 and adhesive panel is fixed.
5. test according to claim 1 stretches the device with cyclic bending concrete durability, which is characterized in that described
First pressure sensor, the first pressure sensor and data acquisition controller electricity are equipped between jack and lateral load bar
Connection.
6. test according to claim 1 stretches the device with cyclic bending concrete durability, which is characterized in that described
Cyclic bending system includes：Electric cylinder；The second pressure sensor being fixed between electric cylinder bottom and reaction frame side wall；With electricity
Telescopic rod connection at the top of dynamic cylinder, is used for the test specimen fixed ring of fixing concrete test specimen；The electric cylinder, second pressure sensor
It is electrically connected with data acquisition controller.
7. test according to claim 6 stretches the device with cyclic bending concrete durability, which is characterized in that described
Load adjusting gasket is equipped between telescopic rod at the top of electric cylinder and test specimen fixed ring.
8. test according to claim 1 stretches the device with cyclic bending concrete durability, which is characterized in that described
The condition test circulatory system is that salt loses system, and salt erosion system includes：
Rubber sleeve is wrapped on the outside of concrete sample, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is equipped with brine, is connected with rubber sleeve, and adjust brine by air inlet pipe invades no height in concrete sample.
9. test according to claim 1 stretches the device with cyclic bending concrete durability, which is characterized in that described
The condition test circulatory system is freezing and thawing system, and the freezing and thawing system includes：
Rubber sleeve is wrapped on the outside of concrete sample, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is 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 cyclic bending system to provide freeze thawing ring
Border.
10. a kind of stretched using any one of the claim 1-9 tests is carried out with the device of cyclic bending concrete durability
The method of experiment, which is characterized in that include the following steps：
Step 1, tensioning system, cyclic bending system and the condition test circulatory system cooperate, and concrete sample is fixed on
In reaction frame；
Step 2, simultaneous equal adjusts jack in tensioning system, pushes lateral load bar to move down and it is forced to stretch concrete
Test specimen stops load when data acquisition controller collects when pulling force reaches setting numerical value, and at this moment concrete axial tension stress is：
Wherein, σ1For concrete sample axial tension stress, F1The pulling force of tensioning system is collected for data acquisition controller, A is mixed
Solidifying soil test specimen area of section；
Step 3, the linear motion reciprocating frequence for cyclic bending system being controlled by data acquisition controller applies concrete sample
Add cyclic bending load, and by data acquisition controller record load F2, then cyclic bending system concrete sample is applied
Moment is：
Wherein, M is the cyclic bending Maximum bending moment that concrete sample is born, F2For the reciprocal curved of data acquisition controller acquisition
The pressure value of bowed pastern system, L are concrete sample length；
Step 4, concrete sample is completed in experiment 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, αc1For prism intensity and stand
The ratio of cube intensity, αc2For Brittleness of Concrete coefficient.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411722A (en) * | 2019-07-26 | 2019-11-05 | 中国航发沈阳发动机研究所 | A kind of structural static and fatigue experimental device |
| CN111650035A (en) * | 2020-07-01 | 2020-09-11 | 北京工业大学 | Vertical bending loading test device |
| CN113203620A (en) * | 2021-06-17 | 2021-08-03 | 浙江水利水电学院 | Tensile bending test equipment |
| CN113567265A (en) * | 2021-07-22 | 2021-10-29 | 中国十七冶集团有限公司 | Concrete bending moment testing device and testing method thereof |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2237847Y (en) * | 1993-12-29 | 1996-10-16 | 苏宗元 | Sealing tester for sleeve and oil pipe |
| CN2702299Y (en) * | 2003-12-25 | 2005-05-25 | 中国建筑材料科学研究院 | Probe unit for damages caused by combined action of concrete environment corrosion and mechanic load |
| CN101275892A (en) * | 2008-03-04 | 2008-10-01 | 东南大学 | Concrete multi-factors durability experimental device under bent tension stress and environment coupled action |
| CN101419143A (en) * | 2008-11-21 | 2009-04-29 | 同济大学 | Bidirectional composite force loading test device for masonry test piece |
| CN201575886U (en) * | 2009-12-29 | 2010-09-08 | 苏州龙盛测试设备有限公司 | Pulling-pressing integrated loading device used for force standard machine |
| CN102213660A (en) * | 2010-04-12 | 2011-10-12 | 青岛理工大学 | Concrete constant stretch holding and composite corrosion testing device |
| CN102466596A (en) * | 2010-11-12 | 2012-05-23 | 中国建筑材料科学研究总院 | Constant loading device for testing durability of reinforced concrete |
| CN102721637A (en) * | 2012-06-29 | 2012-10-10 | 浙江大学 | Multi-functional test system and method for concrete durability under action of continuous pressure |
| CN103149094A (en) * | 2013-03-05 | 2013-06-12 | 华北水利水电学院 | Measuring method and device for tensile creep of early-age concrete |
| CN103837413A (en) * | 2014-03-07 | 2014-06-04 | 中南大学 | Concrete tensile creep testing device and concrete shrinkage stress creep testing method |
| CN205157329U (en) * | 2015-12-02 | 2016-04-13 | 河海大学 | Concrete axle draws and lasts loading device |
| CN106501489A (en) * | 2016-12-09 | 2017-03-15 | 长安大学 | Coarse Saline salt is swollen and molten sunken multifunction test device |
| CN106596287A (en) * | 2016-11-01 | 2017-04-26 | 同济大学 | Tool type masonry flexure strength test lateral loading device |
| CN106644750A (en) * | 2016-12-07 | 2017-05-10 | 凌贤长 | Dynamic and static triaxial tester for frozen and thawed soil in open system |
| CN107063896A (en) * | 2017-06-19 | 2017-08-18 | 武汉大学 | One kind can adjust pressing-shearing combined pilot system technology platform |
| CN208043544U (en) * | 2018-02-01 | 2018-11-02 | 塔里木大学 | A kind of device of test stretching and cyclic bending concrete durability |
-
2018
- 2018-02-01 CN CN201810101108.8A patent/CN108318338B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2237847Y (en) * | 1993-12-29 | 1996-10-16 | 苏宗元 | Sealing tester for sleeve and oil pipe |
| CN2702299Y (en) * | 2003-12-25 | 2005-05-25 | 中国建筑材料科学研究院 | Probe unit for damages caused by combined action of concrete environment corrosion and mechanic load |
| CN101275892A (en) * | 2008-03-04 | 2008-10-01 | 东南大学 | Concrete multi-factors durability experimental device under bent tension stress and environment coupled action |
| CN101419143A (en) * | 2008-11-21 | 2009-04-29 | 同济大学 | Bidirectional composite force loading test device for masonry test piece |
| CN201575886U (en) * | 2009-12-29 | 2010-09-08 | 苏州龙盛测试设备有限公司 | Pulling-pressing integrated loading device used for force standard machine |
| CN102213660A (en) * | 2010-04-12 | 2011-10-12 | 青岛理工大学 | Concrete constant stretch holding and composite corrosion testing device |
| CN102466596A (en) * | 2010-11-12 | 2012-05-23 | 中国建筑材料科学研究总院 | Constant loading device for testing durability of reinforced concrete |
| CN102721637A (en) * | 2012-06-29 | 2012-10-10 | 浙江大学 | Multi-functional test system and method for concrete durability under action of continuous pressure |
| CN103149094A (en) * | 2013-03-05 | 2013-06-12 | 华北水利水电学院 | Measuring method and device for tensile creep of early-age concrete |
| CN103837413A (en) * | 2014-03-07 | 2014-06-04 | 中南大学 | Concrete tensile creep testing device and concrete shrinkage stress creep testing method |
| CN205157329U (en) * | 2015-12-02 | 2016-04-13 | 河海大学 | Concrete axle draws and lasts loading device |
| CN106596287A (en) * | 2016-11-01 | 2017-04-26 | 同济大学 | Tool type masonry flexure strength test lateral loading device |
| CN106644750A (en) * | 2016-12-07 | 2017-05-10 | 凌贤长 | Dynamic and static triaxial tester for frozen and thawed soil in open system |
| CN106501489A (en) * | 2016-12-09 | 2017-03-15 | 长安大学 | Coarse Saline salt is swollen and molten sunken multifunction test device |
| CN107063896A (en) * | 2017-06-19 | 2017-08-18 | 武汉大学 | One kind can adjust pressing-shearing combined pilot system technology platform |
| CN208043544U (en) * | 2018-02-01 | 2018-11-02 | 塔里木大学 | A kind of device of test stretching and cyclic bending concrete durability |
Non-Patent Citations (2)
| Title |
|---|
| 丁晓唐;丁鑫;刘海霞;郑艳;: "混凝土直拉试验和三点弯曲断裂试验确定的软化曲线的比较", 水电能源科学 * |
| 孙继成;姚燕;吴浩;王玲;: "荷载条件下加载装置和渗透性测试方法的研究", 混凝土与水泥制品 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411722A (en) * | 2019-07-26 | 2019-11-05 | 中国航发沈阳发动机研究所 | A kind of structural static and fatigue experimental device |
| CN111650035A (en) * | 2020-07-01 | 2020-09-11 | 北京工业大学 | Vertical bending loading test device |
| CN113203620A (en) * | 2021-06-17 | 2021-08-03 | 浙江水利水电学院 | Tensile bending test equipment |
| CN113567265A (en) * | 2021-07-22 | 2021-10-29 | 中国十七冶集团有限公司 | Concrete bending moment testing device and testing method thereof |
| CN113567265B (en) * | 2021-07-22 | 2024-01-19 | 中国十七冶集团有限公司 | Concrete bending moment testing device and testing method thereof |
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