CN108204921A - A kind of device that concrete is made to generate uniform tension damage - Google Patents
A kind of device that concrete is made to generate uniform tension damage Download PDFInfo
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- CN108204921A CN108204921A CN201810082128.5A CN201810082128A CN108204921A CN 108204921 A CN108204921 A CN 108204921A CN 201810082128 A CN201810082128 A CN 201810082128A CN 108204921 A CN108204921 A CN 108204921A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
A kind of device that concrete is made to generate uniform tension damage, described device loading system, flexural pivot center support system, armored concrete test specimen, multifunctional adaptive restraint system and induction system, the induction system is symmetrically pasted onto on armored concrete test specimen, then multifunctional adaptive restraint system is uniformly fixed on armored concrete test specimen；The flexural pivot center support system is symmetrically mounted on armored concrete test specimen two ends, and the flexural pivot center support system is connect with loading system.The present invention provide it is a kind of it is easy to operate, measuring stability is high and can realize that concrete sample generates the experimental rig of uniform tension damage after reverse cyclic loadings.
Description
Technical field
Concrete is generated the present invention relates to band damage concrete material performance study technical field more particularly to one kind equal
The experimental rig of even tension damage.
Background technology
Concrete structure during military service all works under load and environment collective effect, and no-load effect is lower mixed
The achievement in research of solidifying soil durability cannot rationally reflect the virtual condition residing for structure.Concrete structure is acted in bearing load
Meanwhile the erosions such as seawater, deicer salts and carbon dioxide are often subjected to, in load and environment is dual or multiple factors coupling
Under, the concrete structures accident that often not up to design period just destroys happens occasionally, the huge economic losses thus brought
And casualties, cause extensive concern both domestic and external.Concrete is typical porous material, and etching medium is exactly based on coagulation
Soil pores invades inside concrete, thus leads to steel bar corrosion, crack, and then influence the military service of concrete
Energy.Load action is mainly reflected in the influence that etching medium is transmitted into concrete：Load damage generates inside concrete
Micro-crack, so as to accelerate transmission rate of the etching medium in concrete.
The influence that research load action transmits medium, it is main at present to consider continuing load effect.Again due to bending load
Loading is easy, is widely adopted, and occurs the back-to-back lasting loading of two beams of concrete test specimens successively, based on lever principle
The test methods such as lasting loading are studied with carrying out villaumite transmission test under load action.However, due to along reinforced beam
Depth of section load degree of injury is different, it is difficult to which the influence that load is damaged to medium transmission rate is carried out quantitative analysis, research
As a result some qualitatively conclusions also be can only obtain.From the point of view of the influence that load action transmits medium, tensile load passes medium
Defeated influence is the most prominent.Axis is drawn under load action, and load damage is uniform in concrete sample, can combine durability test,
The effective relationship established between load action and medium transmission is durability prediction, structure design provides reference.
With axial compression tests difference, there is very big difficulty in direct tensile test due to needing to clamp at concrete both ends,
And test specimen axle center and the centering of grip of testing machine center are difficult to realize, the report applied based on axial tension load is more rare, mesh
The preceding method mainly used is that concrete sample is made both ends major part " dog bone " test specimen in favor of clamping, in test specimen and experiment
Machine intersection sets flexural pivot to reduce the error that test specimen and testing machine cannot effectively be brought in.For example, Chinese patent notification number
CN104330314A, data of publication of application are on 2 4th, 2015, entitled " to be surveyed for superhigh temperature ceramics high temperature uniaxial direct tensile intensity
The clamping mechanism that trial assembly is put ", Chinese patent Authorization Notice No. CN103175733B, authorized announcement date are on July 2nd, 2015, name
Referred to as " the direct tensile test fixture of incompressible material ", Chinese patent application publication No. CN103267682A, Shen Qing Publication
Day it is August in 2013 28, entitled " test device and test method of tensile stress and material creep under environment coupled action ",
And Chinese patent Authorization Notice No. CN2014 2 0400110.2, data of publication of application are on January 14th, 2015, entitled " axis
Draw cement-based material testing permeability device under load action ".And Chinese patent application publication No. CN201510863028.2, Shen
Please date of publication be on March 23rd, 2016, it is entitled " concrete component apply axial tension load experimental rig " invented one
Kind can facilitate application continuing load, and can experimental rig and test specimen be placed in the harsh environments such as brine, salt fog simultaneously simultaneously
The device tested.With going deep into for scientific research, research work needs face and solve it is more complicated, closer to engineering
Practical problem in science, for example, Reinforced Concrete Bridge will bear vehicle reverse cyclic loadings and generate concrete damage accumulation, so as to
Durability is caused to deteriorate.China's seashore line length, bridge are more, and bridge spanning the sea is built over ten billion easily and put into, in high speed railway construction
Also overpass mode is largely employed so that train smooth is run.Study damage of the armored concrete under the conditions of reverse cyclic loadings
Hinder deterioration process, experimental study is inevitable.However, on the basis of a large amount of domestic and foreign literatures and related invention patent is consulted, adopt
Concrete tensile loads repeatedly are carried out with existing axis pulling experiment device, when especially application axis draws load larger, often over
There is rupture failure in concrete sample after less loading number, differs greatly with 2,000,000 reverse cyclic loadings targets.By anti-
Check looks for reason to find, concrete is a kind of heterogeneous material, and will appear aggregate during pouring molding is unevenly distributed, is micro-
The problems such as the defects of crack random distribution.In addition, due to concrete sample geometric center and physical centre it is misaligned the problem of with
And there is eccentric load when loading in equipment, even if a load test is all difficult to obtain effective result of the test, and reverse cyclic loadings
Experiment is more difficult to success.
As it can be seen that design one kind is easy to operate, method is reliable, at low cost, concrete sample can be made in reverse cyclic loadings condition
The lower loading device for generating uniform tension damage, it is most important to research reverse cyclic loadings Under Concrete deterioration process, and base
It is also provided in the durability achievement in research of this device by being studied for concrete structure durability with the structure design based on durability
Basic guarantee.
Invention content
Damage test is drawn in order to overcome existing existing current test method that can not complete concrete axial under reverse cyclic loadings not
Foot, present invention offer one kind is easy to operate, measuring stability is high and can realize that concrete sample generates after reverse cyclic loadings
The experimental rig of even tension damage.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of device that concrete is made to generate uniform tension damage, described device loading system, flexural pivot center support system, reinforcing bar
Concrete sample, multifunctional adaptive restraint system and induction system, the induction system are symmetrically pasted onto reinforced concrete
On native test specimen, then multifunctional adaptive restraint system is uniformly fixed on armored concrete test specimen；The flexural pivot center support system
Armored concrete test specimen two ends are symmetrically mounted on, the flexural pivot center support system is connect with loading system.
Further, the loading system includes reaction rack equipment, loading device, upper hanging plate and lower seat board, the loading dress
It puts one end to be fixed on reaction rack equipment in the middle part of top, the loading device other end is connect with upper hanging plate centering；The lower seat board
It is fixed on reaction rack equipment bottom middle part.
Further, the flexural pivot center support system includes flexural pivot connecting plate, test specimen hanging plate, bar hole, flexural pivot center support system
Hanging rod, flexural pivot center support system connecting screw and bulb, the flexural pivot connecting plate by 4 balls cut with scissors center support system hanging rod symmetrically with
Upper hanging plate is connected with lower seat board；Test specimen hanging plate is connect by nut with the exposed steel bar of armored concrete test specimen；The ball-head cover
Enter flexural pivot center support system connecting screw, the flexural pivot center support system connecting screw is first threaded through flexural pivot connecting plate, then with test specimen
It is spirally connected in hanging plate pair.
Further, the multifunctional adaptive restraint system includes cylinder, strap and multifunctional nut bar cramp plate dress
It puts, strap is welded in the middle part of two adjacent surfaces on the inside of the cylinder, the multifunctional nut bar cramp is equipped in the middle part of other two adjacent surfaces
Panel assembly；The multifunctional nut bar cramp panel assembly includes screw rod, sleeve, the first steel plate and the second steel plate, the second steel plate packet
Include v-shaped right angle intermediate plate or arc clip；The middle part of other two adjacent surface offers screw hole and screw thread on the inside of the cylinder
Connecting screw, one end that the screw rod is located in cylinder are rotatablely connected matching sleeve；The sleeve other end is by inserting
Pin is connect with the first steel plate；The first steel plate other end and the welding of the second steel plate, second steel plate are padded with test specimen contact position
There is rubber pad.
The armored concrete test specimen uses self equilibrium systems with loading system and reaction rack equipment；In the loading system
Upper hanging plate and lower seat board be all reserved with the hole to match with flexural pivot center support system hanging rod；The flexural pivot center support system is used and is worn
Core type flexural pivot is to adapt to axial tension test；The test specimen hanging plate carries out X-type fluting
The head room of setting is reserved between the flexural pivot connecting plate and test specimen hanging plate.
Not embedding stirrup inside the armored concrete test specimen and embedding vertical steel, it is end reinforced to be threaded, it exposes to mixed
Solidifying soil test specimen, then be connected on test specimen hanging plate by nut.
The multifunctional adaptive restraint system applies sidewise restraint, the multifunctional adaptive for armored concrete test specimen
Restraint system is loaded using self equilibrium systems, and four intermediate plates in each multifunctional adaptive restraint system are hinged, each
There are two degree of freedom for intermediate plate tool, can carry out horizontal direction rotation, right angle intermediate plate and arc clip can be interchanged；Multifunctional adaptive
High resiliency, high durable rubber are arranged between restraint system intermediate plate and test specimen.
The armored concrete test specimen two ends respectively arrange a multifunctional adaptive restraint system；The multifunctional adaptive
Restraint system adapts to rectangular section or circular cross-section test specimen.
The induction system is connected using foil gauge or Clip Gauge or strain gauge equal to dynamic strain indicator；Induction system
It is symmetrically and evenly arranged on armored concrete test specimen.
This experimental rig is suitable for generating fatigue damage under fatigue tester MTS, is also applied for generating primary add under static load
Carry damage.
The present invention technical concept be：Principle is worked together based on armored concrete, by being applied to armored concrete test specimen
Axial tension load substitution plain concrete test specimen is added to apply axis and draws load, is avoided due to inhomogeneities of concrete own material etc.
Local defect causes test specimen to load fracture failure；Flexural pivot center support system uses punching flexural pivot to adapt to be axially stretched in the present apparatus
Experiment ensures to avoid that eccentric tension occurs in test specimen pair, and then generate uniformly damage；In multifunctional adaptive restraint system substitutes
Stirrup is put, multifunctional adaptive restraint system can remove after loading, make up traditional plain concrete sample due to local defect
It is the defects of leading to test failure, multi-functional adaptive to facilitate and improve also for medium conveyor in guarantee segment analysis concrete
Answer the applicability of restraint system；The present apparatus can be loaded of different shapes using changeable intermediate plate and the test specimen hanging plate of X-type fluting
The test specimen of test specimen and different cross section size or bar spacing；Apparatus of the present invention are simple, easy to operate, cheap, make band damage
Hinder that concrete sample success rate is high, can be widely applied to the medium with damage concrete and transmit research, be to make with certain
The concrete sample of one determining degree of injury provides a kind of new thinking.
Beneficial effects of the present invention are mainly manifested in：It is easy to operate, measuring stability is high and can realize concrete sample
Uniform tension damage is generated after reverse cyclic loadings.
Description of the drawings
Fig. 1 generates uniform axis for concrete and draws damage loading principle figure；
Fig. 2 is loading system figure；
Fig. 3 is test specimen and induction system paste position front view；
Fig. 4 is test specimen and induction system paste position side view；
Fig. 5 is flexural pivot center support system；
Fig. 6 is bulb and flexural pivot center support system connecting screw in flexural pivot center support system；
Fig. 7 is the flexural pivot connecting plate in flexural pivot center support system；
Fig. 8 is the test specimen hanging plate in flexural pivot center support system；
Fig. 9 is multifunctional adaptive restraint system；
Figure 10 is multifunctional nut bar cramp panel assembly front view；
Figure 11 multifunctional nut bar cramp panel assembly side views；
Figure 12 multifunctional nut bar cramp panel assemblies (arc)；
Figure 13 reinforced beam load-deformation curves, wherein, (a) represents the curve of position d, and (b) represents position g's
Curve.
Wherein, 1 it is loading system, 101 be reaction rack equipment, 102 be loading device, 103 be upper hanging plate, 104 is lower seat
Plate, 2 be flexural pivot center support system, 201 be flexural pivot connecting plate, 202 be test specimen hanging plate, 203 be bar hole, 204 be flexural pivot centering system
System hanging rod, 205 are flexural pivot center support system connecting screw and 206 are bulb, 3 are armored concrete test specimen, 301 are TBE (threaded both ends)
Reinforcing bar, 4 be multifunctional adaptive restraint system, 400 be square cylinder, 401 be strap, 402 be multifunctional nut bar cramp
Panel assembly, 403 be screw rod, 404 be sleeve, 405 be bolt, 406 be the first steel plate, 407 be the second steel plate and 5 be sensing system
System.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
With reference to Fig. 1~Figure 13, a kind of concrete generates the device of uniform tension damage, by loading system 1, flexural pivot centering system
System 2, armored concrete test specimen 3, multifunctional adaptive restraint system 4 and induction system 5 form.
302 both ends of reinforcing bar process preset length screw thread respectively, and reinforcing bar is passed through to the preformed hole of die length direction side form
With the position of fixed steel bars, threaded section is exposed in outer casting concrete, and form removal is placed in fog room and conserves.From fog room
Middle taking-up is dried, and the induction system 5 being of convenient length is evenly arranged along two symmetric side axial location of piece lengths direction, in test specimen
Two ends position and middle part are evenly arranged multifunctional adaptive restraint system 4 at a certain distance along its length.It is multi-functional adaptive
Answer 4 specifically used mode of restraint system：Strap 401 is welded in the middle part of 400 two adjacent surfaces of inside of the system middle cylinder body, in addition two
It offers screw hole in the middle part of a adjacent surface and is threadedly coupled multifunctional nut bar cramp panel assembly 402.First multifunctional adaptive is constrained
System 4 is sleeved on test specimen, then applies sidewise restraint, intermediate plate and test specimen to test specimen by multifunctional rotary screw rod fixation device 402
Contact position is lined with high resiliency, high durable rubber, to ensure 3 uniform-compression of armored concrete test specimen.Flexural pivot connecting plate 201 passes through
4 balls hinge center support system hanging rod 204 is symmetrically connect with upper hanging plate 103 and lower bottom base 104.Then will arrange it is multi-functional from
The 3 liang of end bars 301 of armored concrete test specimen for adapting to restraint system 4 are put into the four of test specimen hanging plate 202 to be connected with lower plate 104
In a bar shaped screw hole, the test specimen hanging plate 202 of the alignment of end bar 302 upper end on test specimen is made by range estimation, adjustment test specimen position makes
Lower reinforcing bar 302 all passes through the reserved screw hole of test specimen hanging plate 202, screws on nut, and pays attention to making the tightness of each nut moderate.
Bulb 206 is inserted in flexural pivot center support system connecting screw 205, then flexural pivot center support system connecting screw 205 is first threaded through again
Flexural pivot connecting plate 201, then with being spirally connected in 202 pairs of test specimen hanging plate.Possess about between test specimen hanging plate 202 and flexural pivot connecting plate 201
100mm can up and down adjustment head room, ensure that the threaded Ribbed Bar 302 that reinforced beam 3 both ends reserve is being worn
When crossing that four bar holes 203 are fixed on test specimen hanging plate 202, reinforcing bar will not be expressed to flexural pivot connecting plate 201.Be with that by
The induction system being pasted onto on armored concrete test specimen 3 is connect with deformeter, restarts testing machine, is preloaded.According to adopting
The strain size of test specimen side corresponding position collected judges whether eccentric load, is adjusted with spanner rotary nut to test specimen
Side corresponding position strain is close to unanimously.According to requirement of experiment, carry out the uniform tension of concrete with the mode that program controls and damage
Loading, computer read corresponding ess-strain value.Damage quantitative evaluation is carried out again finally by corresponding data.
After the test, power supply is closed, disconnect the connection of induction system 5 and deformeter and removes induction system 5.First back-out
The nut of upper end flexural pivot center support system connecting screw 205 and connection upper end test specimen hanging plate 202, takes out test specimen hanging plate 202 so that on
End is in free state.Then the nut with lower end test specimen hanging plate 202 is unscrewed, extracts armored concrete test specimen 3.Finally by rotation
Turn multifunctional nut bar cramp panel assembly 402, release multifunctional adaptive 4 constraint to armored concrete test specimen 3 of restraint system, take out
Multifunctional adaptive restraint system 4.The present apparatus can recycle, it is only necessary to which being assembled according to above-mentioned steps can carry out next time again
Experiment.And the present apparatus is readily disassembled again, it is only necessary to each position nut or flexural pivot center support system connecting screw 205 are unscrewed, it is just complete
Into dismounting.Even if there is part damage and secondary replacement can be carried out, it is seen that apparatus of the present invention are simple, easy to operate, valency
Lattice are cheap, and it is high to make band damage concrete sample success rate.
The course of work of the present embodiment is：
The first step：Test specimen pours：It requires to make armored concrete test specimen 3 first, in accordance with test method, the size of test specimen is
The cuboid test specimen of 120mm × 120mm × 1200mm, the ratio of mud 0.53, match ratio are cement:Water:Sand:Coarse aggregate=1:
0.35:1.52:2.50.The raw material of the embodiment mixing concrete：Cement is the common silicic acid of 42.5# of money tide cement plant production
Salt cement, sand use the river sand of fineness modulus 2.4, and coarse aggregate uses the rubble (maximum particle diameter 25mm) of continuous grading, and water uses
Tap water.Concrete sample is molded with wooden model, and shake table vibration compacting demoulds afterwards for 24 hours, and 28d is conserved in fog room Plays, if
The temperature for putting fog room is 20 DEG C, relative humidity 90%.Bar diameter uses 12mm, and length is the Ribbed Bar of 1.35m
302, reinforcing bar is made respectively to reserve 75mm in test specimen two ends and both ends extension is processed into screw thread respectively.
Second step：Pretreatment before experiment：It test specimen from fog room is taken out dries before experiment, then along piece lengths direction
Two symmetric side axial locations are evenly arranged the induction system 5 being of convenient length.Then at test specimen two ends head position and middle part along length
Degree direction is evenly arranged multifunctional adaptive restraint system 4 at a certain distance.
The embodiment induction system 5：A length of 80mm, width is used directly to be measured for the foil resistance foil gauge of 6mm, in test specimen
Two scope of freedoms apart from end 150mm, the intermediate position of midfeather 300-500mm, along the length direction fine sand of test specimen
Paper polish flat width be not less than 10mm vertical belt, floating ash is wiped clean with alcohol swab, after dry tack free, then uses blade
A thin layer epoxy resin is scraped in the position polished, after epoxy resin drying, then it is with 502 glue that resistance strain gage is close
It is pasted onto on vertical belt, induction system 5 is symmetrically pasted on two scope of freedoms of test specimen, is respectively 4 per face.
The embodiment multifunctional adaptive restraint system 4：At test specimen two ends head position and middle part along its length every certain
Distance is evenly arranged two multifunctional adaptive restraint systems 4.The system uses the square cylinder of 240mm × 240mm × 120mm
Body 400,400 inside two adjacent surfaces middle part of square cylinder are welded with strap 401, and the middle part of other two adjacent surface is opened
Equipped with screw hole and it is threadedly coupled multifunctional nut bar cramp panel assembly 402.First multifunctional adaptive restraint system 4 is sleeved on test specimen,
Sidewise restraint applies test specimen by multifunctional rotary screw rod fixation device 402 again, intermediate plate and test specimen contact position be lined with high resiliency,
High durable rubber, to ensure 3 uniform-compression of armored concrete test specimen.
Third walks：Two end bars 302 of the armored concrete test specimen 3 arranged are put into what is be connected with lower bottom base 105
In four bar shaped screw holes of test specimen hanging plate 202, the test specimen hanging plate 202 of the alignment of end bar 302 upper end on test specimen is made by range estimation, is adjusted
Whole test specimen position makes upper and lower reinforcing bar 302 all pass through the reserved screw hole of test specimen hanging plate 202, screws on nut, and pays attention to making each nut
Tightness it is moderate.Induction system 5 is connected to deformeter, is preloaded.According to collected test specimen side corresponding position
Strain size judge whether eccentric load, adjusted with spanner rotary nut to the strain of test specimen side corresponding position close to one
It causes.
4th step：It is further applied load according to scheduled reverse cyclic loadings rule and records stress-strain data, according to off-test
Unloading stands the overstrain that concrete surface is read after 5h afterwards, residual when calculating concrete in tension fatigue damage original state
Remaining strain stressro, concrete in tension destroy corresponding accumulative overstrain εrcAfter n times being recycled with concrete in tension fatigue load
Overstrain εr。
Fatigue loading：Vertical fatigue load is controlled by computer program, and fatigue load mean value and width are included in loading procedure
The settings such as channel selecting, data format and storage, the protection of system internal lock and stopping that value, waveform and frequency, data acquire, these
It is configured in the test procedure that parameter can be established before the test.This experiment sets peak load 15KN, minimum load 6KN,
Loading number is set to 50000 times, loading frequency 5Hz, is loaded using sine wave constant amplitude.
Fatigue test：Bad contact between the connectors such as bearing is eliminated by pre-add 2kN loads, whether is inspection apparatus work
Normally.Then apply pulling force to beams of concrete to 14KN, be then offloaded to 7KN, pass through 50000 times repeatedly loadings and unloading.
Deformation measurement：During fatigue test, stop fatigue loading after the cycle-index 50000 times for reaching setting,
Control program slowly unloads and acquires test specimen overstrain.
After the completion of fatigue test, each position overstrain value, the overstrain of each position a, b, c, d, e, f, g and h are acquired
Value is respectively 28.8 × 10-6、29.2×10-6、36.7×10-6、43.7×10-6、31.3×10-6、35.5×10-6、34.4×
10-6With 39.7 × 10-6。
Wherein, the load-deformation curve of the reinforced beam is as shown in figure 13.
There is document to point out, the maximum overall strain before plain concrete tension fatigue rupture is generally 95 × 10-6With 110 × 10-6
Between, limiting strain when this numerical value is close to concrete static load tensile failure.This experiment considers the influence of reinforcing bar bond stress,
It puts forward a hypothesis：It is all 125 × 10 that the destruction of each concrete, which adds up overstrain,-6, and material initial strain is zero.It will be mixed
Solidifying soil different location overstrain substitutes into overstrain formula, as follows：
In formula, εr0Overstrain during for fatigue damage original state, εrcCumulative Residual Strain during for damage and failure, εr
The overstrain after n times is recycled for fatigue load.
Can obtain its fatigue damage, the fatigue damage of each position a, b, c, d, e, f, g and h is respectively 0.230,0.234,
0.294th, 0.350,0.250,0.284,0.275 and 0.318.
Finally it should be noted that a specific embodiment listed above only for the present invention, it is clear that the present invention
It is not intended to limit above example.Can also be there are many other deformations, protection scope of the present invention is also including those skilled in the art
According to present inventive concept it is conceivable that equivalent technologies mean.
Claims (10)
1. a kind of device that concrete is made to generate uniform tension damage, it is characterised in that：Described device loading system, flexural pivot centering
System, armored concrete test specimen, multifunctional adaptive restraint system and induction system, the induction system are symmetrically pasted onto
On armored concrete test specimen, then multifunctional adaptive restraint system is uniformly fixed on armored concrete test specimen；The flexural pivot
Center support system is symmetrically mounted on armored concrete test specimen two ends, and the flexural pivot center support system is connect with loading system.
2. a kind of device that concrete is made to generate uniform tension damage as described in claim 1, it is characterised in that：The loading
System includes reaction rack equipment, loading device, upper hanging plate and lower seat board, and described loading device one end is fixed on reaction rack equipment
Top middle part, the loading device other end are connect with upper hanging plate centering；The lower seat board is fixed on reaction rack equipment bottom middle part.
3. a kind of device that concrete is made to generate uniform tension damage as claimed in claim 2, it is characterised in that：The flexural pivot
Center support system includes flexural pivot connecting plate, test specimen hanging plate, bar hole, flexural pivot center support system hanging rod, flexural pivot center support system connecting screw
And bulb, the flexural pivot connecting plate cut with scissors center support system hanging rod by 4 balls and are symmetrically connect with upper hanging plate and lower seat board；Test specimen is hung
Plate is connect by nut with the exposed steel bar of armored concrete test specimen；The ball-head cover enters flexural pivot center support system connecting screw, institute
It states flexural pivot center support system connecting screw and is first threaded through flexural pivot connecting plate, then with being spirally connected in test specimen hanging plate pair.
4. a kind of device that concrete is made to generate uniform tension damage as described in one of claims 1 to 3, it is characterised in that：
The multifunctional adaptive restraint system includes cylinder, strap and multifunctional nut bar cramp panel assembly, the cylinder inside two
Strap is welded in the middle part of adjacent surface, the multifunctional nut bar cramp panel assembly is equipped in the middle part of other two adjacent surfaces；It is described multi-functional
Screw rod fixation device include screw rod, sleeve, the first steel plate and the second steel plate, second steel plate include v-shaped right angle intermediate plate or
Arc clip；The middle part of other two adjacent surface offers screw hole and is threadedly coupled screw rod on the inside of the cylinder, the screw rod
One end in cylinder is rotatablely connected matching sleeve；The sleeve other end is connect by bolt with the first steel plate；
The first steel plate other end and the welding of the second steel plate, second steel plate are lined with rubber pad with test specimen contact position.
5. a kind of device that concrete is made to generate uniform tension damage as described in one of claims 1 to 3, it is characterised in that：
The armored concrete test specimen uses self equilibrium systems with loading system and reaction rack equipment；Upper hanging plate in the loading system
The hole to match with flexural pivot center support system hanging rod is all reserved with lower seat board；The flexural pivot center support system uses punching flexural pivot
To adapt to axial tension test；The test specimen hanging plate carries out X-type fluting.
6. a kind of device that concrete is made to generate uniform tension damage as described in one of claims 1 to 3, it is characterised in that：
The head room of setting is reserved between the flexural pivot connecting plate and test specimen hanging plate.
7. a kind of device that concrete is made to generate uniform tension damage as described in one of claims 1 to 3, it is characterised in that：
Not embedding stirrup inside the armored concrete test specimen and embedding vertical steel, it is end reinforced to be threaded, concrete sample is exposed to,
It is connected on test specimen hanging plate by nut again.
8. a kind of device that concrete is made to generate uniform tension damage as claimed in claim 4, it is characterised in that：More work(
The adaptive restraint system of energy applies sidewise restraint for armored concrete test specimen, and the multifunctional adaptive restraint system uses certainly flat
Weighing apparatus system loads, and four intermediate plates in each multifunctional adaptive restraint system are hinged, and there are two freely for each intermediate plate tool
Degree, can carry out horizontal direction rotation, right angle intermediate plate and arc clip can be interchanged；Multifunctional adaptive restraint system intermediate plate and examination
High resiliency, high durable rubber are arranged between part.
9. a kind of device that concrete is made to generate uniform tension damage as described in one of claims 1 to 3, it is characterised in that：
The armored concrete test specimen two ends respectively arrange a multifunctional adaptive restraint system；The multifunctional adaptive restraint system
Adapt to rectangular section or circular cross-section test specimen.
10. a kind of device that concrete is made to generate uniform tension damage as described in one of claims 1 to 3, it is characterised in that：
The induction system is connected using foil gauge or Clip Gauge or strain gauge equal to dynamic strain indicator；Induction system is mixed in reinforcing bar
It is symmetrically and evenly arranged on solidifying soil test specimen.
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| CN201810082128.5A CN108204921A (en) | 2018-01-29 | 2018-01-29 | A kind of device that concrete is made to generate uniform tension damage |
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| CN201810082128.5A CN108204921A (en) | 2018-01-29 | 2018-01-29 | A kind of device that concrete is made to generate uniform tension damage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829764A (en) * | 2020-06-08 | 2020-10-27 | 中电建路桥集团有限公司 | Mechanical measurement device for right-angle reinforced concrete member and use method |
| CN113008665A (en) * | 2021-02-03 | 2021-06-22 | 广东翔顺建筑工程有限公司 | Reliable FRP muscle overlap joint performance test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2670443Y (en) * | 2003-11-27 | 2005-01-12 | 中铁工程机械研究设计院 | Prestressed concrete tubular pile clipper |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829764A (en) * | 2020-06-08 | 2020-10-27 | 中电建路桥集团有限公司 | Mechanical measurement device for right-angle reinforced concrete member and use method |
| CN113008665A (en) * | 2021-02-03 | 2021-06-22 | 广东翔顺建筑工程有限公司 | Reliable FRP muscle overlap joint performance test device |
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