CN205941200U - Concrete temperature stress testing machine - Google Patents
Concrete temperature stress testing machine Download PDFInfo
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- CN205941200U CN205941200U CN201620721682.XU CN201620721682U CN205941200U CN 205941200 U CN205941200 U CN 205941200U CN 201620721682 U CN201620721682 U CN 201620721682U CN 205941200 U CN205941200 U CN 205941200U
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Abstract
The utility model discloses a concrete temperature stress testing machine, include: free deformation test machine, restraint deformation test machine, restraint deformation test press packed bale is drawn together: die block board and side form board, die block board and the cooperation of side form board form and are suitable for the restraint die cavity of placing concrete restraint test piece, are equipped with two through -holes on the die block board, two P ripples sensors, the correspondence of two P ripples sensors are established on the upper surface and lower surface of concrete restraint test piece, and the P ripples sensor of establishing on the lower surface of concrete restraint test piece is located one of them through -hole, two S ripples sensors, the correspondence of two S ripples sensors are established on the upper surface and lower surface of concrete restraint test piece, and the S ripples sensor of establishing on the lower surface of concrete restraint test piece is located another through -hole, restraint deformation detection device. According to the utility model discloses concrete temperature stress testing machine can really detect the concrete creep by calibration, and the testing result more is close actual.
Description
Technical field
The utility model belongs to building hydraulic engineering concrete test technical field, is related to a kind of concrete temperature stress examination
Test machine.
Background technology
The Creep Characteristics of concrete are important indicators evaluating mass concrete early stage anti-crack ability.Creep ability
Power be impact mass concrete early stage thermal cracking a key factor.At present with regard to coagulation soil temperature under restraint condition
The maximally effective research technique of simulation of degree stress is concrete temperature stress testing machine (TSTM), and TSTM is for the test side crept
Method also keeps with conventional creep test that load is constant bigger difference.
What scholars were most widely used is the method for testing of creeping that Kovler proposes at present, and the method is based on closed loop computer control
System is theoretical, sets up constraint test specimen and two sets of testing machines of Free Transform test specimen to test simultaneously, with the active chuck accumulation displacement of record
To represent the elastic deformation of concrete, finally to deduct chuck accumulation displacement with Free Transform and creep to represent.
But the method have ignored the impact of machine stiffness, Lin demonstrates Kovler by theoretical formula and asks the side crept
The impact of mechanical stiffness is have ignored, the chuck accumulated deformation being recorded not is the real elastic deformation of concrete in method, and then
Propose to represent elastic strain with the method for restraint stress difference/elastic modelling quantity, then deduct elasticity using Free Transform strain
Strain is crept to ask.
Although Lin gives the theoretical calculation formula of elastic deformation, surveying elastic modelling quantity using " active method " can be to early stage
Concrete sample causes to damage, and the elastic modelling quantity error of mensure is larger, this error and then can cause larger to the result crept
Impact.At present both at home and abroad using in the method crept of TSTM system measurement concrete for consider Testing machine stiffness after rare
It is related to.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.For this reason, this reality
Propose a kind of concrete temperature stress testing machine with new, described concrete temperature stress testing machine can accurately detect
Concrete creep.
According to concrete temperature stress testing machine of the present utility model, including：Free Transform testing machine, described Free Transform
Testing machine is provided with the free die cavity being suitable to place the free test specimen of concrete and for measuring the free test specimen of described concrete
The Free Transform detection means of Free Transform；Restrained deformation testing machine, described restrained deformation testing machine includes：End template and side form
Plate, described end template and described side template cooperatively form open upper end and are suitable to place the constraint mould that concrete constrains test specimen
Chamber, described end template is provided with two through holes；Two P wave sensors, two described P wave sensor positions pair in the vertical direction
Should, one of described P wave sensor is located at the upper surface that described concrete constrains test specimen, and another described P wave sensor sets
Constrain on the lower surface of test specimen in described concrete and be located in one of in described through hole；Two S wave sensors, described in two
Position corresponds to S wave sensor in the vertical direction, and one of described S wave sensor is located at described concrete and constrains the upper of test specimen
Surface, another described S wave sensor is located at described concrete and constrains on the lower surface of test specimen and be located therein described in another
In through hole；Restrained deformation detection means, described deformation measuring device includes fixed chuck, active chuck and sensor cluster, institute
State sensor cluster to be connected with described active chuck, described fixed chuck and described active chuck are folded in described concrete respectively
The two ends of constraint test specimen.
Concrete creep, detection knot can accurately be detected according to concrete temperature stress testing machine of the present utility model
Fruit is closer to reality, easy to operate, has the advantages that lossless, quick, repeatable.
In addition, it is special to have, according to concrete temperature stress testing machine of the present utility model, the technology added as follows
Levy：
According to some embodiments of the present utility model it is characterised in that described P wave sensor and described S wave sensor are fitted
Constrain on test specimen in being pasted onto described concrete.
According to some embodiments of the present utility model, one of two described through holes through hole sets adjacent to described fixed chuck
Put, another through hole in two described through holes is arranged adjacent to described active chuck.
According to some embodiments of the present utility model, the line at the center of two described through holes prolongs along the axial direction of described die cavity
Stretch.
Additional aspect of the present utility model and advantage will be set forth in part in the description, partly will be from explained below
In become obvious, or recognized by practice of the present utility model.
Brief description
Fig. 1 is according to concrete sample and examination before the active chuck regulation of the utility model embodiment temperature stress testing machine
Test the action principle figure of machine；
Fig. 2 is according to concrete sample and examination after the active chuck regulation of the utility model embodiment temperature stress testing machine
Test machine action principle figure；
Fig. 3 is the top view of the part-structure of the temperature stress testing machine according to the utility model embodiment.
Reference：
Concrete 1；Spring 2；Active chuck 3；P wave sensor 4；S wave sensor 5；Restrained deformation detection means 6.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of described embodiment is shown in the drawings.Below by
The embodiment being described with reference to the drawings is exemplary it is intended to be used for explaining the utility model, and it is not intended that new to this practicality
The restriction of type.
Describe the concrete temperature stress testing machine according to the utility model embodiment below in conjunction with the accompanying drawings in detail.
With reference to shown in Fig. 1, Free Transform examination is included according to the concrete temperature stress testing machine of the utility model embodiment
Test machine and constraint deformation test machine.Restrained deformation testing machine include end template, side template, P wave sensor 4 and S wave sensor 5 with
And restrained deformation detection means 6.Restrained deformation detection means 6 includes fixed chuck, active chuck 3 and sensor cluster.Bed die
Plate and side template cooperation limit Constrained die cavity, and concrete constraint test specimen can be placed in constraint die cavity, constrains the upper of die cavity
End is opened wide.Sensor cluster is connected with active chuck 3, and fixed chuck and active chuck 3 are folded in concrete constraint test specimen respectively
Two ends.
End template is provided with two through holes, and P wave sensor 4 includes two, two P wave sensor 4 positions in the vertical direction
Put and correspond to that is to say, that two P wave sensors 4 are distributed on same vertical curve.One of P in two P wave sensors 4
Wave sensor 4 is suitable to be located at the upper surface that concrete constrains test specimen, and in two P wave sensors 4, another P wave sensor 4 is suitable to
It is located at concrete to constrain on the lower surface of test specimen and be located in one of through hole of two through holes.
Similarly, S wave sensor 5 includes two, and two S wave sensors 5 correspond to position in the vertical direction, two S ripples
One of S wave sensor 5 in sensor 5 is suitable to be located at the upper surface that concrete constrains test specimen, in two S wave sensors 5
Another S wave sensor 5 be suitable to be located at concrete and constrain on the lower surface of test specimen and be located at the one of of two through holes
In through hole.
Thus, two P wave sensors 4 may be located at the both sides that concrete constrains test specimen, and two S wave sensors 5 also are located at
Concrete constrains the both sides of test specimen, and the P wave sensor 4 positioned at homonymy and S wave sensor 5 are spaced apart setting, such that it is able to
Realize the detection of transverse wave speed and longitudinal wave velocity, and then realize the detection that concrete constrains the dynamic modulus of elasticity of test specimen, be conducive to
The accurate detection of follow-up concrete creep, convenient operation, and also Detection results are preferable.
Free Transform testing machine is provided with free die cavity and Free Transform detection means, and the free test specimen of concrete can be placed
In free die cavity, Free Transform detection means can be used for measuring the Free Transform of the free test specimen of concrete.Free die cavity
Can be enclosed by template and be formed.The structure of Free Transform testing machine is knowable to those skilled in the art, and here is not
Describe in detail again.
According to the concrete temperature stress testing machine of the utility model embodiment, passed by arranging P wave sensor 4 and S ripple
Sensor 5 grade part, can realize the detection of shear wave and compressional wave, thus realizing concrete sample in temperature stress process of the test
The detection of elastic modelling quantity, this device can be using the elastic modelling quantity obtaining concrete using Dynamic Non-Destruction Measurement measurement, it is to avoid right
Concrete causes unnecessary damage, is conducive to the accurate detection of concrete creep, and can indirectly consider the firm of testing machine
The impact to concrete creep for the degree, it is possible to achieve the rapidly and efficiently detection of concrete creep, repeatable high, precision is higher.
Alternatively, P wave sensor 4 and S wave sensor 5 can be pasted onto on concrete constraint test specimen.Thus, not only facilitate
Install, and can ensure that P wave sensor 4 and S wave sensor 5 constrain the close contact of test specimen with concrete and be firmly connected,
Improve Detection results.
As shown in figure 3, one of two through holes through hole can neighbouring fixed chuck setting, another in two through holes
Through hole can neighbouring active chuck 3 be arranged.Thus, the distance between P wave sensor 4 and S wave sensor 5 suitable it is ensured that
Good Detection results.
Alternatively, the line at the center of two through holes can be axially extending along die cavity.Here, the axial direction of die cavity can be managed
Solve the length direction constraining test specimen for concrete.Thus, it is possible to improve the accuracy of elastic modelling quantity detection further.
To using the concrete temperature stress testing machine according to the utility model embodiment, concrete creep is carried out below
The method of testing of creeping of detection is described, and this detection method of creeping comprises the following steps：
S1：Pour into a mould concrete respectively in free die cavity peace treaty bundle die cavity and vibrate, freely tried with forming concrete respectively
Part and concrete constraint test specimen.
S2：P ripple corresponding with two lead to the hole site is respectively mounted on the upper and lower surface that concrete constrains test specimen
Sensor 4 and S wave sensor 5, and constrain shear wave in temperature stress process of the test for the test specimen using concrete is measured to the method for survey
Velocity of wave VSWith longitudinal wave velocity VP.
S3：By elastic theory formula Ed=(Vp 2(3Vp 2-4Vs 2))/(Vp 2-Vs 2) it is derived from the dynamic of concrete constraint test specimen
Elastic modulus Ed.
S4：Set up Free Transform testing machine and the free test specimen of concrete and restrained deformation testing machine and concrete constraint examination
The model of part, and the stress balance formula according to model and dynamic modulus of elasticity Ed, solve and obtain concrete constraint test specimen and constraint
The deformation D that the interaction of deformation test machine producesE0, and obtain the concrete creep after calculation of temperature stresses Testing machine stiffness
Dc.
Supersonic damage-free detection method is adopted to measure P, S of concrete according to the method for testing of creeping of the utility model embodiment
Velocity of wave, and then calculate the dynamic modulus of elasticity of concrete, can indirectly consider the impact to concrete creep for the rigidity of testing machine, this
Kind of method rapidly and efficiently, and repeatable high it is considered to after rigidity measured creeping more tally with the actual situation, precision is higher,
Concrete temperature stress testing machine in correlation technique can be effectively overcome to measure the not enough problem of method precision of creeping.
As depicted in figs. 1 and 2, in more preferably embodiment more of the present utility model, in step s 4, model is coagulation
Soil 1 and spring 2 series model, using formula DE0=KsdDEa/Kc=F/KcCalculate DE0, wherein, KsFor restrained deformation testing machine
Rigidity, KcConstrain the rigidity of test specimen for concrete, F is the stress of restrained deformation testing machine record, Kc=EcA/l, Ec=α Ed, α is
Dynamic and static elasticity modulus empirical coefficient, A constrains the area of section of test specimen for concrete, and l constrains the original length of test specimen for concrete,
EdConstrain the dynamic modulus of elasticity of test specimen for concrete, that is, the dynamic modulus of elasticity obtaining in step S3.This kind of model is more simple
Single, and be closer to really situation it is ensured that the accuracy of detection of creeping.
Further, in this concrete with spring 2 series model, the deformation of the free test specimen of concrete is mainly by concrete
The deformation that deformation, spring 2 and the coagulation soil interaction actually occurring produces, three parts of creeping of concrete form, and there are public affairs
Formula：Dc=Df-DEa-DE0, wherein, DfAccumulation Free Transform for Free Transform testing machine record；DEaFor restrained deformation testing machine
The Displacement Cumulative that actually occurs of active chuck 3, automatically recorded by pilot system, calculation of temperature stresses Testing machine stiffness
The formula of creeping of concrete creep Dc afterwards is Dc=Df-DEa-F×l/(α×Ed×A).Using Xu after this consideration rigidity
Become creeping and more tally with the actual situation measured by formula, detection structure is more accurate, temperature stress testing machine can be preset with point
Analysis computing module, can obtain concrete creep Dc in conjunction with the dynamic modulus of elasticity that Non-Destructive Testing obtains and formula of creeping, this value
It is the final detected value of temperature stress testing machine.
In sum, P wave sensor and S wave sensor etc. are utilized according to the method for testing of creeping of the utility model embodiment
Vltrasonic device measures the horizontal stroke of concrete sample, longitudinal wave velocity, and then moving by elastic theory derivation of equation concrete sample
Property modulus, finally derived by equilibrium equation indirectly considers the creep Calculation Method of Testing machine stiffness using dynamic modulus of elasticity, should
Method of testing of creeping passes through acoustic detection method, has the advantages that lossless, quick, repeatable；Consider Testing machine stiffness impact
Formula of creeping afterwards more tallies with the actual situation, and precision is higher.
Other compositions of temperature stress testing machine according to the utility model embodiment and other operations of detection method
It is knowable for the person of ordinary skill of the art, here is not described in detail.
In description of the present utility model it is to be understood that term " " center ", " length ", " on ", D score, " front ",
" afterwards ", the orientation of instruction such as " vertical ", " level ", " top ", " bottom ", " interior ", " outward " or position relationship are based on shown in the drawings
Orientation or position relationship, are for only for ease of description the utility model and simplify description, rather than the dress of instruction or hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the utility model
Restriction.
In description of the present utility model, " multiple " are meant that at least two, such as two, three etc., unless otherwise
Clearly specifically limit.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be
It is mechanically connected or electrically connect or can communicate each other；Can be to be joined directly together it is also possible to pass through the indirect phase of intermediary
Even, can be the connection of two element internals or the interaction relationship of two elements, limit unless otherwise clear and definite.For this
For the those of ordinary skill in field, concrete meaning in the utility model for the above-mentioned term can be understood as the case may be.
In the description of this specification, reference term " embodiment ", " specific embodiment ", " example " or " specific example " etc.
Description mean that specific features with reference to this embodiment or example description, structure, material or feature are contained in the utility model
At least one embodiment or example in.In this manual, phase is necessarily directed to the schematic representation of above-mentioned term
Same embodiment or example.And, the specific features of description, structure, material or feature can be in any one or more enforcements
Combine in an appropriate manner in example or example.Additionally, in the case of not conflicting, those skilled in the art can be by this
The feature of the different embodiments described in specification or example and different embodiment or example is combined and combines.
Although of the present utility model embodiment has been shown and described above it is to be understood that above-described embodiment is
Exemplary it is impossible to be interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
Interior above-described embodiment can be changed, change, replacing and modification.
Claims (4)
1. a kind of concrete temperature stress testing machine is it is characterised in that include：
Free Transform testing machine, described Free Transform testing machine be provided be suitable to place the free test specimen of concrete free die cavity with
And for measuring the Free Transform detection means of the Free Transform of the free test specimen of described concrete；
Restrained deformation testing machine, described restrained deformation testing machine includes：
End template and side template, described end template and described side template have cooperatively formed open upper end and have been suitable to place concrete about
The constraint die cavity of bundle test specimen, described end template is provided with two through holes；
Two P wave sensors, two described P wave sensors correspond to position in the vertical direction, one of described P wave sensor
It is located at described concrete and constrains on the upper surface of test specimen, another described P wave sensor is located at described concrete and constrains test specimen
On lower surface and be located in one of in described through hole；
Two S wave sensors, two described S wave sensors correspond to position in the vertical direction, one of described S wave sensor
It is located at described concrete and constrains on the upper surface of test specimen, another described S wave sensor is located at described concrete and constrains test specimen
On lower surface and be located therein in another described through hole；
Restrained deformation detection means, described restrained deformation measurement apparatus include fixed chuck, active chuck and sensor cluster, institute
State sensor cluster to be connected with described active chuck, described fixed chuck and described active chuck are folded in described concrete respectively
The two ends of constraint test specimen.
2. concrete temperature stress testing machine according to claim 1 is it is characterised in that described P wave sensor and described S
Wave sensor is suitable to be pasted onto on described concrete constraint test specimen.
3. concrete temperature stress testing machine according to claim 1 is it is characterised in that one of two described through holes
Through hole is arranged adjacent to described fixed chuck, and another through hole in two described through holes is arranged adjacent to described active chuck.
4. concrete temperature stress testing machine according to claim 1 is it is characterised in that the center of two described through holes
Line is axially extending along described die cavity.
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| CN201620721682.XU CN205941200U (en) | 2016-07-08 | 2016-07-08 | Concrete temperature stress testing machine |
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| CN201620721682.XU CN205941200U (en) | 2016-07-08 | 2016-07-08 | Concrete temperature stress testing machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018094A (en) * | 2016-07-08 | 2016-10-12 | 清华大学 | Concrete temperature stress testing machine and creep testing method |
| CN107977544A (en) * | 2017-11-16 | 2018-05-01 | 浙江工业大学 | Elastic strain calculation method and system for constraint test piece in temperature-stress test |
-
2016
- 2016-07-08 CN CN201620721682.XU patent/CN205941200U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018094A (en) * | 2016-07-08 | 2016-10-12 | 清华大学 | Concrete temperature stress testing machine and creep testing method |
| CN107977544A (en) * | 2017-11-16 | 2018-05-01 | 浙江工业大学 | Elastic strain calculation method and system for constraint test piece in temperature-stress test |
| CN107977544B (en) * | 2017-11-16 | 2020-08-21 | 浙江工业大学 | Elastic strain calculation method and system for constraint test piece in temperature-stress test |
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