CN106092769A - Concrete fatigue test system under bending shear stress state - Google Patents
Concrete fatigue test system under bending shear stress state Download PDFInfo
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- CN106092769A CN106092769A CN201610389597.2A CN201610389597A CN106092769A CN 106092769 A CN106092769 A CN 106092769A CN 201610389597 A CN201610389597 A CN 201610389597A CN 106092769 A CN106092769 A CN 106092769A
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- 239000004567 concrete Substances 0.000 title claims abstract description 58
- 238000009661 fatigue test Methods 0.000 title claims abstract description 33
- 238000005452 bending Methods 0.000 title abstract 4
- 238000012360 testing method Methods 0.000 claims abstract description 105
- 229910000831 Steel Inorganic materials 0.000 claims description 45
- 239000010959 steel Substances 0.000 claims description 45
- 238000010008 shearing Methods 0.000 claims description 34
- 238000005728 strengthening Methods 0.000 claims description 12
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 11
- 239000011888 foil Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 2
- 238000009826 distribution Methods 0.000 description 8
- 238000011160 research Methods 0.000 description 8
- 238000005336 cracking Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N2203/0025—Shearing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- 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 relates to the technical field of concrete fatigue tests, in particular to a concrete fatigue test system under a bending shear stress state, which comprises a test piece and a bending shear stress fatigue loading device, wherein the test piece comprises a test piece body and a reinforcing steel plate, two opposite first end surfaces in the width direction of the test piece body are respectively provided with a notch vertical to the end surfaces, the notch divides the first end surface where the notch is located into a first section and a second section, the length of the first section is greater than that of the second section, the first section of one first end surface is opposite to the second section of the other first end surface, and the reinforcing steel plate is arranged on the side surfaces of the first section and the first section of the notch close to the first end surface where the notch is located; the bending shear stress fatigue loading device comprises a shear fatigue load fixing support and a loading device, the shear fatigue load fixing support is connected with the two second end faces in the length direction of the test piece body, and the loading device is connected with the overlapped sections of the first sections of the two first end faces to apply lateral pressure and lateral tension.
Description
Technical field
The present invention relates to concrete fatigue test technical field, particularly relate to concrete fatigue under a kind of curved scissors stress
Pilot system.
Background technology
At present for concrete tension (curved draw, axle draws, split and draw), resistance to compression and non-proportional loading have much research and
Having arrived corresponding S-N curvilinear equation, the many forms from component of anti-shear concrete fatigue aspect study the shearing resistance of xoncrete structure
Performance, but it is less, therefore, from test specimen to study the document of the shear fatigue intensity of concrete and S-N curve with sample type
Form research anti-shear concrete fatigue problem, first sets about from concrete static state shearing strength, and comes based on static test research
Carry out anti-shear concrete Fatigue Test Research.The material character of concrete own determines its shearing experiment method and is difficult to unified.
Hofbeck etc. use Z-type test specimen to carry out the Shear transfer of Study on Steel reinforced concrete, suitably arrange reinforcing bar, make test specimen exist
Intended plane sliding failure.And obtain following result: if test specimen does not has crack when on-test, then coagulation soil classifiction is
Comprcssive strength is worth 0.119-0.316.Li Pingxian, Zhang Leishun, State of Zhao's fence etc. uses Z-type test specimen to study Mechanics Performance of Adherence of New
The freeze proof cutting performance in face, its sample type used and Zhang Qi, cross concrete shearing strength and the research of detrusion in Zhenghai
In the most similar.Concrete shearing load-deformation curve is studied by Dong Yuli, and the Curve guide impeller having made Z-type test specimen
Calculate corresponding form.Wang Chuanzhi etc. have employed rectangular beam double shear interview part and carry out anti-shear concrete performance test.Zhang Qi, mistake
Zhenghai etc. are same has done corresponding summary to conventional concrete shear test, and wherein sample type used is carried out finite element fraction
Analysis, it is indicated that rectangle double shear interview part, Z-type test specimen and the shortcoming of 8 type test specimens, and improve the contour change of 8 type specimen Designs
4 stress shearing tests of wide beam, 4 stress tests of the block interface of a kind of improvement.Owing to 8 type shearing test test specimens are at breach
The most advanced and sophisticated place of re-entrant angle concentrates due to stress and crack occurs, is not crack occur in the middle part of the indentations section of shear stress maximum,
Therefore the contour beam that broadens is become to solve the impact that stress near breach is seriously concentrated.
By to the summary of above anti-shear concrete strength test sample type and Numerical Simulation Analysis, Z-type tries
Part relatively rectangle double shear interview part shearing stress distribution is more uniformly distributed；The Z-type test specimen shearing stress distribution that the Z-type test specimen of improvement is more traditional has
Bigger improvement, stress distribution law is essentially identical, and the uniformity reducing counter stress distribution of shear surface area has certain improvement；With
Shi Zhangqi, contour 4 the stress shearing test beams relatively 8 type test specimens that broaden crossing the designs such as Zhenghai have had significant improvement, have compared Z simultaneously
Type test specimen and rectangle double shear face beam shearing stress distribution are more uniformly distributed, but load mode is complex.
But from the point of view of each sample type result of calculation during actual loaded, all sample types include that Z-type tries
All there is a common fault in part, that is, maximal main extended stress value is not at shear stress maximum, say, that the position first ftractureed
Put not on shear surface；So under Fatigue Load, the position of specimen crack germinating is with shear stress maximum position not
Unanimously, the germinating of concrete cracks under research shear fatigue load action is brought dry with development and shear fatigue life-span
Disturb.Therefore, cut to study concrete by pure shear or draw, press and cut fatigue failure characteristics, first must ensure that test specimen is in characteristic face rate
First ftracture, it is to avoid ftracture and affect being concerned about that cross section produces in other positions.
Summary of the invention
(1) to solve the technical problem that
The technical problem to be solved in the present invention be solve existing concrete fatigue test system during actual experiment,
After test specimen is loaded fatigue load, the place first ftractureed the most not in the position that shearing is maximum, occur in that maximum shear stress with
The position of big principal tensile stress disunity, the problem that accuracy and the science of result of the test are had undesirable effect.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides concrete fatigue test system under a kind of curved scissors stress
System, including test specimen and curved scissors stress fatigue loading device, described test specimen includes test specimen body and strengthening steel slab, described test specimen body
On width relative to two the first end faces on be equipped with and be perpendicular to the breach of the first end face, described breach is by its place first
End face is divided into first paragraph and second segment, and the length of described first paragraph is more than the length of described second segment, the institute of first end face
Stating first paragraph relative with the described second segment of another the first end face, described strengthening steel slab is arranged at described first paragraph and lacks with described
Mouth is on the side of the described first paragraph of its place the first end face；Described curved scissors stress fatigue loading device includes shear fatigue
Load hold-down support and charger, described shear fatigue load hold-down support and two on described test specimen body length direction
Second end face connects, with by fixing in its longitudinal direction for described test specimen and apply shear fatigue load, described charger with
The superposition section of the described first paragraph of two the first end faces connects, with described test specimen is applied in the width direction lateral pressure with
Lateral force, it is achieved pressure is cut and drawn and cuts fatigue load.
Wherein, described charger include lateral pressure charger, described lateral pressure charger include the first jack,
Fixed mount, the first connecting plate and the second connecting plate, described first connecting plate and described second connecting plate are respectively at two the first ends
The superposition section of the described first paragraph in face connects, and described first connecting plate is near described first jack and first very heavy with described
The piston rod on top connects, and described second connecting plate is away from described first jack, and is connected with described fixed mount.
Wherein, described first connecting plate is provided with the first pressure transducer with the junction of the piston rod of described jack.
Wherein, described fixed mount includes two steel pipes and two fixation steel plates, and two described steel pipes lay respectively at described examination
Both sides on part thickness direction, the two ends of described steel pipe are connected with two described fixation steel plates respectively, and the pipe shaft of described steel pipe
Sequentially pass through described first connecting plate and described second connecting plate.
Wherein, described charger also includes that side draw charger, described side draw charger include that second is very heavy
Top and sleeve, described sleeve includes that inner sleeve and outer sleeve, described second jack are arranged in described overcoat bucket, and described the
The cylinder body of two jack is connected with the inner face of one end of described overcoat bucket, the piston rod of described second jack and described inner sleeve
The outer face of one end of cylinder connects, and the inner face of the outer face of the other end of described outer sleeve and the other end of described inner sleeve divides
It is not connected with the superposition section of the described first paragraph of two the first end faces.
Wherein, the piston rod of described second jack is provided with second with the junction of the outer face of one end of described inner sleeve
Pressure transducer.
Wherein, the superposition section of the described first paragraph of two described first end faces is provided with link, the described overcoat bucket other end
Outer face be equipped with the hook corresponding with described link, described hook and institute with on the inner face of the described inner sleeve other end
State link mounting, to realize the connection of described suspension member and described sleeve.
Wherein, described hold-down support includes that the first bearing and the second bearing, described first bearing divide with described second bearing
Not being connected with two the second end faces on described test specimen body length direction, described first bearing includes pedestal and ball hinged support,
Described pedestal end face is connected with described second end face, and other end is provided with the depression of arcwall face, and described depression and described ball
The spherical surface hill of the end face of hinged-support matches to contact and connects.
Wherein, the thickness of described strengthening steel slab is 3mm.
Wherein, described test specimen body thickness direction connects on surface between two described breach there are foil gauge or detection
Device.
(3) beneficial effect
The technique scheme of the present invention has the advantage that concrete fatigue test system under curved scissors stress of the present invention
Testing its shearing strength by own font test specimen and carrying out shearing resistance fatigue test of system, goes out to send observation coagulation from sample type
The failure mode that soil shearing resistance is tired, test specimen has more uniform shearing stress distribution on shear surface, therefore can obtain being subject to shear
Power is main shear surface, by the shear fatigue load hold-down support of curved scissors stress fatigue loading device on piece lengths direction
Both ends of the surface apply shear fatigue load, the superposition section of the first paragraph in the both ends of the surface on specimen width direction is executed by charger
Plus side compressive load and layback load, study the germinating etc. of concrete destruction form and crackle.First paragraph to test specimen body
And the breach surface configuration strengthening steel slab near first paragraph, it is carried out consolidation process so that test specimen is between two breach
Destroy cracking at first on the shear surface that test specimen body surface is formed, rather than occur without on shear surface and split, make maximum shear stress with
The position unification that big principal tensile stress is maximum, after steel plate reinforcement, on shear surface, principal tensile stress compares other positions maximums, eliminates it
Impact on shear surface fatigue behaviour after the cracking of his position, thus reach test requirements document.The curved scissors stress of the present invention is tired simultaneously
The charger of charger directly carries out fatigue loading to the shearing face of test specimen, it is to avoid classic fatigue pilot system is to test specimen
The problem carrying out indirectly shearing loading thus affect test effect.
Except the technical characteristic of technical scheme that described above present invention solves the technical problem that, constitute and there is this
Outside the advantage that the technical characteristic of a little technical schemes is brought, the other technologies feature of the present invention and these technical characteristics bring
Advantage, will further illustrate in conjunction with accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the structural representation of the test specimen of concrete fatigue test system under embodiment of the present invention curved scissors stress；
Fig. 2 is that the lateral pressure of concrete fatigue test system loads device under embodiment of the present invention curved scissors stress loads
The structural representation of device；
Fig. 3 is that the side draw of concrete fatigue test system loads device under embodiment of the present invention curved scissors stress loads
The structural representation of device；
Fig. 4 is fixing of the shear fatigue load of concrete fatigue test system under embodiment of the present invention curved scissors stress
The structural representation of seat；
Fig. 5 is the structure of the test specimen body of concrete fatigue test system test specimen under embodiment of the present invention curved scissors stress
Schematic diagram；
Fig. 6 is concrete fatigue test system shear fatigue load hold-down support under embodiment of the present invention curved scissors stress
The structural representation of the second bearing；
Fig. 7 is the vertical view of the pedestal of concrete fatigue test system the second bearing under embodiment of the present invention curved scissors stress
Structural representation.
In figure: 1: test specimen；2: charger；3: shear fatigue load hold-down support；4: link；5: hook；11: test specimen is originally
Body；12: strengthening steel slab；21: lateral pressure charger；22: side draw charger；31: the first bearings；32: the second bearings；
111: breach；112: first paragraph；113: second segment；211: the first jack；212: fixed mount；213: the first connecting plates；214:
Second connecting plate；215: the first pressure transducers；221: the second jack；222: sleeve；223: the second pressure transducers；311:
Pedestal；312: ball hinged support；212a: steel pipe；212b: fixation steel plate；212c: fixation steel plate；222a: inner sleeve；222b: overcoat
Cylinder.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained on the premise of not making creative work, broadly falls into the scope of protection of the invention.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；Can
To be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, can understand that above-mentioned term is at this with concrete condition
Concrete meaning in invention.
Additionally, in describing the invention, except as otherwise noted, " multiple ", " many ", " many groups " be meant that two or
Two or more, " several ", " some ", " some groups " are meant that one or more.
As shown in Figure 1, Figure 2 and Figure 3, concrete fatigue test system under the curved scissors stress that the embodiment of the present invention provides
System, including test specimen 1 and curved scissors stress fatigue loading device, test specimen 1 includes test specimen body 11 and strengthening steel slab 12, test specimen body 11
On width relative to two the first end faces on be equipped with and be perpendicular to the breach 111 of the first end face, breach 111 is by its place
End face is divided into first paragraph 112 and second segment 113, and the length of first paragraph 112 is more than the length of second segment 113, first end
The first paragraph 112 in face is relative with the second segment 113 of another the first end face, and strengthening steel slab 12 is arranged at first paragraph 112 and breach
111 on the side of the first paragraph 112 of its place the first end face；Curved scissors stress fatigue loading device includes shear fatigue load
Hold-down support 3 and charger 2, shear fatigue load hold-down support 3 and two the second ends on test specimen body 11 length direction
Face connects, to be fixed in its longitudinal direction by test specimen 1 and to apply shear fatigue load, charger 2 and two the first end faces
First paragraph 112 superposition section connect, test specimen 1 to be applied in the width direction lateral pressure and lateral force, it is achieved press
Cut and draw and cut fatigue load.
Under curved scissors stress of the present invention concrete fatigue test system to test its shearing resistance by own font test specimen strong
Spending and carry out shearing resistance fatigue test, going out from sample type to send and observe the failure mode that anti-shear concrete is tired, test specimen is being sheared
Having more uniform shearing stress distribution on face, therefore can obtain shearing stress is main shear surface, tired by curved scissors stress
The shear fatigue load hold-down support of charger applies shear fatigue load to the both ends of the surface on piece lengths direction, adds and carries
Putting, charger applies side pressure load and layback load to the superposition section of the first paragraph in the both ends of the surface on specimen width direction,
Study the germinating etc. of concrete destruction form and crackle.First paragraph to test specimen body and the breach surface near first paragraph
Strengthening steel slab is set, it is carried out consolidation process so that the shearing that test specimen test specimen body surface between two breach is formed
Destroy cracking on face at first, rather than occur without on shear surface and split, make the position system that maximum shear stress and maximal main extended stress are maximum
One, after steel plate reinforcement, on shear surface, principal tensile stress compares other positions maximums, tired to shear surface after eliminating other positions cracking
The impact of labor performance, thus reach test requirements document.The charger of the curved scissors stress fatigue loading device of the present invention is to examination simultaneously
The shearing face of part directly carries out fatigue loading, it is to avoid classic fatigue pilot system test specimen carried out indirectly shearing load thus
The problem affecting test effect.
Wherein, as in figure 2 it is shown, charger 2 includes that lateral pressure charger 21, lateral pressure charger 21 include first
Jack 211, fixed mount the 212, first connecting plate 213 and the second connecting plate 214, the first connecting plate 213 and the second connecting plate 214
Respectively at two the first end faces first paragraph 112 superposition section connect, the first connecting plate 213 near described first jack 211,
And first connecting plate 213 be connected with the piston rod of the first jack 211, the second connecting plate 214 away from the first jack 211, and
Second connecting plate 214 is connected with fixed mount 212.The charger of curved scissors stress fatigue loading device includes that lateral pressure adds and carries
Putting, the first connecting plate and the second connecting plate are connected with the superposition section of the first end face on specimen width direction, the first jack
Piston rod the first connecting plate is applied pressure, the second connecting plate is propped up by fixed mount, and test specimen is lived by the first connecting plate
The active force of stopper rod, and the active force that test specimen is applied by fixed mount by the second connecting plate, thus test specimen is applied lateral pressure,
Realize coagulation soil pressure and cut loading test.Wherein, the first jack generally can use hydraulic jack.
Concrete, the junction of the piston rod of the first connecting plate 213 and the first jack 211 is provided with the first pressure transducer
215.When piston rod promotes the first connecting plate, the first pressure transducer can detect that the force situation of piston rod, and strictly controls
Pressing pressure value.
Further, fixed mount 212 includes two steel pipe 212a and fixation steel plate 212b and fixing steel 212c, two steel pipes
212a lays respectively at the both sides on test specimen 1 thickness direction, the two ends of steel pipe 212a respectively with fixation steel plate 212b and fixation steel plate
212c connects, and the pipe shaft of steel pipe 212a sequentially passes through the first connecting plate 213 and the second connecting plate 214.First jack, first
Within pressure transducer and test specimen may be contained within two fixation steel plates of fixed mount and the space of two fastener for connection formation, fixing
Steel plate keeps fixed position motionless, and steel pipe fixes the position of two connecting plates through the first connecting plate and the second connecting plate,
Making it keep the close contact with surface of test piece to be connected, when the piston rod of the first jack is released, fixed mount and second connects
Plate jointly acts on and applies to be in reverse to first connecting plate active force to the pressure that test specimen applies to test specimen.
Wherein, as it is shown on figure 3, charger 2 also includes that side draw charger 22, side draw charger 22 include
Two jack 221 and sleeve 222, sleeve 222 includes inner sleeve 222a and outer sleeve 222b, outside the second jack 221 is arranged at
In set bucket 222b, and the cylinder body of the second jack 221 is connected with the inner face of one end of overcoat bucket 222b, the second jack 221
Piston rod be connected with the outer face of one end of inner sleeve 222a, the outer face of the other end of outer sleeve 222b and inner sleeve 222a
The inner face superposition section with the first paragraph 113 of two the first end faces respectively of the other end be connected.Curved scissors stress fatigue loading fills
The charger put also includes side draw charger, and when the piston rod of the second jack is pushed out, piston rod promotes inner sleeve
Motion, inner sleeve applies tension to the superposition section of the first end face that it connects, and the cylinder body of the second jack is anti-relative to piston
To motion, thus connected overcoat bucket is also relative to inner sleeve adverse movement, the superposition section to the first end face that it connects
Apply reverse tension, thus test specimen is applied side draw, it is achieved concrete pulling cuts loading test.Wherein, second is very heavy
Top generally uses hydraulic jack.
Concrete, the junction of the piston rod of the second jack 221 and the outer face of one end of inner sleeve 222a is provided with the
Two pressure transducers 223.When piston rod promotes inner sleeve motion, the second pressure transducer can detect that the force feelings of piston rod
Condition, and strictly control value of thrust.
Further, the superposition section of the first paragraph 112 of two the first end faces is provided with link 4, another of overcoat bucket 222b
End outer face be equipped with the hook 5 corresponding with link 4 on the inner face of the other end of inner sleeve 222a, hook 5 with extension
Ring 4 mounts, to realize the connection of test specimen 1 and sleeve 222.Use the mounting form of link and hook, make overcoat bucket and inner sleeve
Respectively the superposition section of the first paragraph of two the first end faces connects, by overcoat bucket and inner sleeve relative to reversely moving, to test specimen
The superposition section of both sides apply opposition, to realize side draw fatigue test to test specimen, simple in construction, it is simple to dismounting peace
Dress.
Wherein, as shown in Figure 4, hold-down support 3 includes the first bearing 31 and the second bearing 32, the first bearing 31 and second
Seat 32 is connected with two the second end faces on test specimen body 11 length direction respectively, and the first bearing 31 includes pedestal 311 and ball pivot
Bearing 312, pedestal 311 end face and the second end face connect, and pedestal 311 other end is provided with the depression of arcwall face, and depression with
The spherical surface hill of the end face of ball hinged support 312 matches to contact and connects.The shear fatigue load of curved scissors stress fatigue loading device
Hold-down support is used for fixing test specimen body, and test specimen is applied shear fatigue load, and the first bearing and the second bearing are to test specimen
Fixed-direction is the length direction along test specimen body, vertical with the force direction of charger, is ensureing fixed situation
Under, in order to eliminate the impact of eccentric compression, it is ensured that concrete sample uniform force, it is to be connected with test specimen by the first susceptor design
Pedestal and the ball hinged support being connected with mobility aid, ball hinged support is matched basic connection by cambered surface with base-plates surface.Such as Fig. 6 and
Shown in Fig. 7, in the present embodiment length L7 of pedestal be 100mm, highly L8 be 30mm, arcwall face depression degree of depth L10 be 10mm,
Circular radius L13 on base end face is 45mm, length L12 of ball hinged support be 100mm, highly L9 be 35mm, Qi Zhongqiu
The height L11 of face projection is 15mm.
It addition, the thickness of strengthening steel slab 12 is 3mm.Consolidation constraint, steel plate and concrete is used between steel plate and concrete
Employing construction structure glue coheres.As it is shown in figure 5, the thickness of test specimen body is 10mm in the present embodiment, total length L 6 is 440mm,
Width L1 is 360mm, and length L2 of first paragraph is 270mm, and length L3 of second segment is 150mm, and the width L4 of breach is 20mm,
Degree of depth L5 is 180mm.
Wherein, test specimen body 11 thickness direction connects on surface between two breach 12 there are foil gauge or detection dress
Put.Under Fatigue Load, concrete sample diagonal crack initiating life and crack developing form, and by pasting the side of foil gauge
Formula research modulus of shearing Changing Pattern and the Changing Pattern of principal tensile stress amplitude.It is main owing to research emphasis is to shear stress
Concrete sample static state under Fatigue Load and fatigue behaviour, therefore need to reserve on shear surface paste foil gauge and
Other test instrunments etc..
In sum, being tested by own font test specimen of concrete fatigue test system under curved scissors stress of the present invention
Its shearing strength also carries out shearing resistance fatigue test, goes out to send to observe the failure mode that anti-shear concrete is tired, examination from sample type
Part has more uniform shearing stress distribution on shear surface, and therefore can obtain shearing stress is main shear surface, passes through curved scissors
The shear fatigue load hold-down support of stress fatigue loading device applies shear fatigue to the both ends of the surface on piece lengths direction and carries
Lotus, charger applies side pressure load and layback load to the superposition section of the first paragraph in the both ends of the surface on specimen width direction,
Study the germinating etc. of concrete destruction form and crackle.First paragraph to test specimen body and the breach surface near first paragraph
Strengthening steel slab is set, it is carried out consolidation process so that the shearing that test specimen test specimen body surface between two breach is formed
Destroy cracking on face at first, rather than occur without on shear surface and split, make the position system that maximum shear stress and maximal main extended stress are maximum
One, after steel plate reinforcement, on shear surface, principal tensile stress compares other positions maximums, tired to shear surface after eliminating other positions cracking
The impact of labor performance, thus reach test requirements document.The charger of the curved scissors stress fatigue loading device of the present invention is to examination simultaneously
The shearing face of part directly carries out fatigue loading, it is to avoid classic fatigue pilot system test specimen carried out indirectly shearing load thus
The problem affecting test effect.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent；
And these amendment or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. concrete fatigue test system under a curved scissors stress, it is characterised in that: include that test specimen and curved scissors stress are tired
Charger, described test specimen includes test specimen body and strengthening steel slab, on described test specimen body width direction relative to two first
Being equipped with the breach being perpendicular to the first end face on end face, its place first end face is divided into first paragraph and second segment by described breach,
The length of described first paragraph is more than the length of described second segment, the described first paragraph of first end face and another first end face
Described second segment relative, described strengthening steel slab is arranged at described first paragraph and the described breach institute near its place the first end face
State on the side of first paragraph；Described curved scissors stress fatigue loading device includes shear fatigue load hold-down support and charger,
Described shear fatigue load hold-down support is connected with two the second end faces on described test specimen body length direction, with by described examination
Part is fixed in its longitudinal direction and applies the described first paragraph of shear fatigue load, described charger and two the first end faces
Superposition section connect, so that described test specimen is applied lateral pressure and lateral force in the width direction, it is achieved pressure is cut and is drawn and cuts
The applying of fatigue load.
Concrete fatigue test system under curved scissors stress the most according to claim 1, it is characterised in that: described loading
Device includes that lateral pressure charger, described lateral pressure charger include the first jack, fixed mount, the first connecting plate and
Two connecting plates, described first connecting plate and described second connecting plate are respectively at the superposition section of the described first paragraph of two the first end faces
Connecting, described first connecting plate is near described first jack, and is connected with the piston rod of described first jack, described second
Connecting plate is away from described first jack, and is connected with described fixed mount.
Concrete fatigue test system under curved scissors stress the most according to claim 2, it is characterised in that: described first
Connecting plate is provided with the first pressure transducer with the junction of the piston rod of described first jack.
Concrete fatigue test structure under curved scissors stress the most according to claim 2, it is characterised in that: described fixing
Frame includes that two steel pipes and two fixation steel plates, two described steel pipes lay respectively at the both sides on described specimen thickness direction, institute
The two ends stating steel pipe are connected with two described fixation steel plates respectively, and the pipe shaft of described steel pipe sequentially passes through described first connecting plate
With described second connecting plate.
Concrete fatigue test system under curved scissors stress the most according to claim 1, it is characterised in that: described loading
Device also includes that side draw charger, described side draw charger include that the second jack and sleeve, described sleeve include
Inner sleeve and outer sleeve, described second jack is arranged in described overcoat bucket, and the cylinder body of described second jack is with described
The inner face of one end of overcoat bucket connects, and the piston rod of described second jack connects with the outer face of one end of described inner sleeve
Connect, the inner face of the other end of the outer face of the other end of described outer sleeve and described inner sleeve respectively with two the first end faces
The superposition section of described first paragraph connects.
Concrete fatigue test system under curved scissors stress the most according to claim 5, it is characterised in that: described second
The piston rod of jack is provided with the second pressure transducer with the junction of the outer face of one end of described inner sleeve.
Concrete fatigue test system under curved scissors stress the most according to claim 5, it is characterised in that: described in two
The superposition section of the described first paragraph of the first end face is provided with link, and the outer face of the described overcoat bucket other end is another with described inner sleeve
Being equipped with the hook corresponding with described link on the inner face of one end, described hook mounts with described link, described to realize
Suspension member and the connection of described sleeve.
Concrete fatigue test system under curved scissors stress the most according to claim 1, it is characterised in that: described shearing
Fatigue load hold-down support includes the first bearing and the second bearing, described first bearing and described second bearing respectively with described examination
Two the second end faces on part body length direction connect, and described first bearing includes pedestal and ball hinged support, described pedestal one
End face is connected with described second end face, and other end is provided with the depression of arcwall face, and the end of described depression and described ball hinged support
The spherical surface hill in face matches to contact and connects.
Concrete fatigue test system under curved scissors stress the most according to claim 1, it is characterised in that: described reinforcing
The thickness of steel plate is 3mm.
Concrete fatigue test system under curved scissors stress the most according to claim 1, it is characterised in that: described examination
Connect on surface between two described breach on part body thickness direction and have foil gauge or detection device.
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| CN112146999A (en) * | 2020-10-19 | 2020-12-29 | 长沙理工大学 | Test piece shear test device for repairing concrete beam bridge web by UHPC |
| CN114397198A (en) * | 2022-01-14 | 2022-04-26 | 南通理工学院 | Novel test method for Z-shaped precast crack concrete shear strength test specimen |
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| CN112146999A (en) * | 2020-10-19 | 2020-12-29 | 长沙理工大学 | Test piece shear test device for repairing concrete beam bridge web by UHPC |
| CN114397198A (en) * | 2022-01-14 | 2022-04-26 | 南通理工学院 | Novel test method for Z-shaped precast crack concrete shear strength test specimen |
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