CN106018044A - Test piece of concrete direct tensile test, test piece forming die and integrated equipment - Google Patents
Test piece of concrete direct tensile test, test piece forming die and integrated equipment Download PDFInfo
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- CN106018044A CN106018044A CN201610659029.XA CN201610659029A CN106018044A CN 106018044 A CN106018044 A CN 106018044A CN 201610659029 A CN201610659029 A CN 201610659029A CN 106018044 A CN106018044 A CN 106018044A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
The invention discloses a test piece of a concrete direct tensile test, a test piece forming die and integrated equipment. According to the invention, the test piece of the concrete direct tensile test, the test piece forming die of the concrete direct tensile test and the integrated equipment of the concrete direct tensile test are provided; the test piece of the concrete direct tensile test is a square-cross section equal thickness dumbbell-type tension test piece; the test piece forming die of the concrete direct tensile test comprises a side mold framework and a base plate, the side mold framework is formed by performing butt joint on two linked side plates; and the integrated equipment of the concrete direct tensile test comprises a loading framework, a loading mechanism, a test piece tensioning clamper, a test piece deformation test clamp and a data acquisition system. The Test piece of concrete direct tensile test, the test piece forming die and the integrated equipment have the advantages of reasonable design, simple structure, environmental protection, high efficiency and accurate testing.
Description
Technical field
The present invention relates to engineering detecting experimental technique field, particularly relate to a kind of concrete direct tensile test test specimen,
Specimen molding mould and complexes.
Background technology
Concrete direct tensile test is accurately to obtain concrete tensile strength, limit stretch value and tensile modulus of elasticity
Etc. the important technical of a series of tension parameters, provide important depending on for the Concrete Structure Design, theory analysis and performance evaluation
According to.But concrete direct tensile test at present there is no preferable test method and device, and concrete in uniaxial tensile strength is mostly
Obtain by Indirect Tensile Tests or by the empirical formulas with comprcssive strength.Concrete Indirect Tensile Tests method (as
Tensile splitting strength and bending tensile strength) though relatively simple, they are not the true of Analysis of Concrete Tensile intensity strictly speaking
Real reflection.With regard to the relation between concrete tensile strength and comprcssive strength, although research worker has pointed out various empirical equation, but
The problem that the most generally there is dependency difference.When carrying out concrete direct tensile test, rational test specimen pattern
With the key that stretching mode is to ensure that success of the test, for a long time, domestic and international scientific research personnel once developed multiple test specimen pattern and
Corresponding stretching mode, test specimen longitudinal direction configuration can be summarized as column type and dumbbell shape, and test specimen cross sectional configuration has circular and square, its
Middle cylindricality test piece end is divided into again partial enlargement and overall amplification two kinds.Stretching mode can be summarized as three kinds: 1. by test specimen
Two ends fastener inserts buries type (end perforation can be as the interior specific form burying type) in carrying out stretch-draw；2. pressed from both sides by outer clamp
Holding test specimen two ends provides frictional force that test specimen carries out the outer clip-type of stretch-draw；3. stretch-draw is carried out by binding material bonding testing piece two ends
Binding type.Preferably concrete direct tensile test must assure that the stress produced on test specimen cross section is uniformly distributed, completely
Eliminate stress gradient, the most also should meet accurate, efficient, environmental protection, the requirement of the aspect such as reproducible.But at present from the most existing
Some situations are seen, there is no a kind of test specimen pattern that can fully meet these requirements and stretching mode (device).
For the interior type stretching mode that buries, not only the making of test specimen is the most loaded down with trivial details, and this heterogeneous for concrete
Material, it is ensured that test specimen geometric center is the most difficult with physical centre strict conformance.Therefore, even if test specimen makes good, its examination
Test success rate and there is also uncertainty.
For end perforation type stretching mode, except test specimen makes and in addition to clamping difficulty, if when test specimen makes it cannot be guaranteed that
The reasonable Arrangement in hole, then the accuracy of its test result is just difficult to ensure that.And, this test specimen in loading process two draw
Stress will be produced at hole concentrate, it is easy to cause circular hole to deform, cause unbalance loading, and make the plane of disruption be difficult to fall predetermined destruction section.
For friction-type stretching mode, owing to frictional force and test specimen comprcssive strength there is no directly related property, when test is high-strength
During concrete sample, it is likely to be due to frictional force deficiency and does not ensures test specimen destruction, or long for ensureing the design of enough frictional force
Test specimen bring again inconvenience.
For binding type stretching mode, its operation sequence is the most complicated, is first to need to make the stickup supporting with test specimen
Plate, when experiment work amount is bigger, the quantity of pasting boards is also the biggest.Next to that the binding agent smeared easily pollutes environment, its
The health of operator also can be worked the mischief by volatilization gas, after off-test, during recycling pasting boards, removes high-strength resin glue
The most extremely it is difficult to.In a word, the method waste of manpower and material resources, efficiency is too low and not environmentally.
Existing Eight-character-shaped concrete high-point elongation test clamper (notification number CN201203556) mainly includes pedestal, clamping
Beam is hinged in the circular hole on pedestal substrate, and two supporting plates are connected to the trapezoidal plate of pedestal both sides respectively by supporting plate alignment pin
On.The Eight-character-shaped concrete high-point elongation test clamper that this invention provides can be clamped in the jaw of testing machine, eight words of test specimen
Type end can extend into the connection realizing fixture and testing machine in the trapezoidal plate of pedestal both sides.Although the fixture that this invention is provided can
Splayed configuration concrete sample is clamped and tension test, but practice have shown that the success rate of test is the lowest, i.e. the fracture of test specimen
Nearly all at variable cross-section, being difficult to occur within predetermined destruction section, obtained experimental result just fails to reflect that concrete breaks at random
The intrinsic propesties split.Owing to rational scheme can not be given in the method for designing of test specimen pattern and test specimen stretch-draw clamping fixture,
Just it is difficult to avoid that the stress at test specimen variable cross-section is concentrated, just cannot obtain more valuable result of the test, therefore, it is necessary to exploitation
Go out a kind of rational in infrastructure, simple operation and can accurately test test specimen pattern and the complexes of concrete uniaxial direct tensile performance, and
It is easy on ordinary test machine carry out direct tensile test.
Summary of the invention
The present invention solves weak point of the prior art, it is provided that a kind of reasonable in design, simple in construction, environment-friendly high-efficiency,
Concrete direct tensile test test specimen, specimen molding mould and the complexes of accurate testing, try including concrete uniaxial direct tensile
Test part, concrete direct tensile test specimen molding mould and concrete direct tensile test complexes.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
Concrete direct tensile test test specimen, described test specimen is square section equal thickness dumbbell shape tensile test piece, and it from top to bottom depends on
Secondary for upper strong section, upper loaded segment, upper power transmission section, test section, lower power transmission section, lower loaded segment and under strong section, test section is
Predetermined destruction section；The cross section of each section is all square, and section thickness is the most equal, and cross-sectional width is the most strong by making a reservation for destruction section
Section and under strong section be gradually increased；Upper loaded segment is disposed as longitudinally becoming no more than 45 degree oblique with test specimen with lower loaded segment side
Face, upper power transmission section two sides are set to cambered surface, and cambered surface two end grain is loaded segment and the predetermined side destroying section, uploads
Power section two sides seamlessly transit with the linkage interface of upper loaded segment and the predetermined side destroying section, and lower power transmission section two sides are set to
Cambered surface, and cambered surface two end grain is lower loaded segment and the predetermined side destroying section, lower power transmission section two sides and lower loaded segment and
The linkage interface of the predetermined side destroying section seamlessly transits.
It is a further object of the present invention to provide concrete direct tensile test specimen molding mould, the die cavity of this test piece mould
Corresponding with described test specimen, described specimen molding mould includes side form framework and base plate；Side form framework is closed side plate by two groups of chains
Docking and formed, often group chain conjunction side plate is articulated and connected forms by horizontal side plate and longitudinal side plate, and often the longitudinal side plate of group chain conjunction side plate is right
Answering position to be provided with stopper slot, during docking, the end of one group of chain conjunction horizontal side plate of side plate is inserted another group chain and is closed side plate longitudinal side plate
In the stopper slot that end is arranged；
Often the horizontal side end outer side center of group chain conjunction side plate is provided with side plate rotating shaft screw bolt, and side plate rotating shaft screw bolt arranges locking screw
Mother, often the vertical side end of group chain conjunction side plate is provided with side plate bolt draw-in groove, two groups of chains with described rotating shaft screw bolt corresponding position
Closing side plate to be fastenedly connected by two set side plate bolt draw-in grooves, side plate rotating shaft screw bolt and locking nut, during docking, one group of chain closes
The side plate rotating shaft screw bolt of the horizontal side plate of side plate snaps in the side plate bolt draw-in groove that another group chain closes side plate longitudinal side plate；
The surrounding side center of base plate is outwards provided with base plate rotating shaft screw bolt, and base plate rotating shaft screw bolt arranges locking nut, side form
On the horizontal side plate of every block of framework and longitudinal side plate, base plate rotating shaft screw bolt corresponding position is provided with bed bolt draw-in groove, the described end
Base plate and side form framework are connected as holistic specimen molding mould by the base plate rotating shaft screw bolt that crab bolt draw-in groove and base plate are arranged,
During connection the base plate rotating shaft screw bolt of base plate snap in side form framework bed bolt draw-in groove in.
The configuration of the longitudinal side plate that described often group chain closes side plate is consistent with longitudinal side of described test specimen；Arrange on described base plate
Having step, step shape is corresponding with the longitudinal cross-section of described test specimen.
It is a further object of the present invention to provide concrete direct tensile test complexes, described complexes include and institute
Stating the test specimen stretch-draw clamping fixture that test specimen matches, described test specimen stretch-draw clamping fixture includes connecting plate, limb plate, clamping beam, ball pivot
Head and T-shaped clamp；
Before and after described connecting plate inner end, side is fixedly connected with the limb plate having down Y-shaped, and each limb plate divides the left and right sides all downwards
Going out two limb arms, limb arm end is provided with circular trepanning, the front and back corresponding limb of the corresponding limb arm in the left side two of side limb plate and right side two
Clamping beam it is provided with, spacing two circles at front and back's side limb plate correspondence limb arm of rotating shaft that clamping beam is arranged by two ends between arm
In shape trepanning, clamping beam is rotationally connected with circular trepanning by rotating shaft；It is provided with ball pivot nest in the middle of clamping beam, arranges in ball pivot nest
Ball pivot head, ball pivot head is fixedly connected as entirety, the clamping face of the T-shaped clamp in left and right two and described test specimen with T-shaped clamp by fore-set
Upper loaded segment or lower loaded segment two sides laminating.
Concrete direct tensile test complexes also include test piece deformation test fixture, described test piece deformation test fixture
The fixed structure being made up of forelimb, left limb and hind leg is all included and by the right side including upper frame and underframe, upper frame and underframe
The movable structure of limb composition, the hind leg right-hand member of fixed structure and the rear end of right limb be articulated and connected, the forelimb right-hand member of fixed structure and
Right limb front end is connected by lock pin, and described lock pin is arranged in the stopper slot of right limb front end, and before and after stopper slot, sidewall is provided with
Limit the slip guide hole of lock pin position, be provided with handle in the middle of lock pin, the lock pin bar between handle and stopper slot rear wall
On be set with back-moving spring, described forelimb right part is provided with the latch channels corresponding with lock pin towards the side of lock pin, lock
Pin press-in slot after movable structure right limb i.e. with fixed structure group all-in-one-piece structural framing；The arrangement of described left limb medial surface sets
Being equipped with at least two addendum cone, right limb medial surface is provided centrally with specimen holder screw, and specimen holder screw is through right limb and its top
On the left of end points to；
Upper frame and underframe all by two addendum cones and a specimen holder screw clamping at the test section of described test specimen；
The left limb of upper frame and right limb downside have been fixedly connected with gauge length post, and gauge length post lateral wall is provided with front band, lower frame
The left limb of frame and right limb are respectively arranged with lower catch hoop, front band and lower catch hoop with the clip corresponding position on gauge length post and constitute change
Shape clamp of sensor.
Concrete direct tensile test complexes also include loading frame and load maintainer, described loading frame include by
Left post that left-to-right is sequentially arranged, center pillar and right post and the girder being from top to bottom sequentially arranged, guide beam and base, Zuo Zhu, in
Post and right post are consolidated on base, and guide beam is consolidated on left post and center pillar, and girder is consolidated on left post, center pillar and right post, main
On the left of beam and guide beam, place is arranged in vertical the most corresponding guide rod slide-and-guide trepanning；On the right side of girder, place is along Vertical Square
To being provided with pull bar slide-and-guide trepanning；Center pillar cylinder center between girder and guide beam is provided with lever square hole；
Described load maintainer includes loading guide rod, lever, rotating shaft, rotating disk handle, loading nut and pull bar, loads guide rod and passes through institute
Stating guide rod slide-and-guide trepanning to be slidably connected with loading frame formation, load guide rod top and arrange carrying cap, lever passes through respectively
Rotating shaft is articulated and connected with loading guide rod, center pillar and pull bar, and lever is oval with loading guide rod, lever with the connecting hole of pull bar
Hole, the connecting hole of lever and center pillar is circular hole, is articulated and connected with lever by pivot pin in the middle part of pull bar, pull bar upper end pass described in draw
Bar slide-and-guide trepanning is also slidably connected with girder, and pull bar stretches out the upper part of girder slip guide hole and is provided with external screw thread, if
Put and at the externally threaded body of rod, be arranged with loading nut；
The upper loaded segment of described test specimen and lower loaded segment position respectively arrange a set of described test specimen stretch-draw clamping fixture, upper loaded segment
Described test specimen stretch-draw clamping fixture setting symmetrical above and below at the described test specimen stretch-draw clamping fixture at place and lower loaded segment, often overlaps examination
The outer end of the connecting plate of part stretch-draw clamping fixture is provided with hemispherical ball pivot hole corresponding at described test specimen centre pull axis,
Arranging ball pivot connector in hemispherical ball pivot hole, the test specimen stretch-draw clamping fixture at upper loaded segment is by corresponding ball pivot connector
Being connected with pull bar, the test specimen stretch-draw clamping fixture at lower loaded segment is connected with load transducer by corresponding ball pivot connector.
Concrete direct tensile test complexes also include that data collecting system, described data collecting system include load
Sensor, deformation-sensor, controller, computer, two deformation-sensors are clamped on the deformation-sensor fixture of correspondence, lotus
The upper end of set sensor is connected with corresponding test specimen stretch-draw clamping fixture by corresponding ball pivot connector, under load transducer
End is connected with described base, and load transducer and deformation-sensor are connected with controller by data cable respectively, and controller leads to
Cross data cable to be connected with computer.
It is provided with cushion on the clamping face of described T-shaped clamp；
The outward flange of described T-shaped clamp is provided with postive stop baffle, the angle that described postive stop baffle is formed with T-shaped clamp clamping face with
The corner of described test specimen corresponding position is equal；
It is provided with trip bolt on described deformation-sensor clip；
The cross section of described lock pin and slip guide hole is square, and described slot is also square, the longitudinal direction of the tapered end of described lock pin
Medial surface is cambered surface；
Load the connection of nut extenal fixation and have rotating disk handle, load and be provided with bearing between the slip guide hole of nut and girder；
In the middle part of pull bar, at top side, fixed cover is provided with disk, and buffer unit is located at the position on lever between girder and disk
Place；
Described buffer unit is spring or antivibrator；
Described base and corresponding position, load transducer lower end are also equipped with hemispherical ball pivot hole, arrange in hemispherical ball pivot hole
Ball pivot connector, the lower end of load transducer is connected with described base by corresponding ball pivot head connector.
Described deformation-sensor is differential transformer type displacement meter, and the front band on described gauge length post is fixing differential transformation
The main body of device formula displacement meter, corresponding lower catch hoop fixes top board, and the ball of differential transformer type displacement meter test lead withstands on top board
On, in test process, differential transformer type displacement meter makes ball and top plate contact, by upper all the time by the flexible member of self
The relative displacement of framework and underframe transmission obtains test specimen and makes a reservation for destroy the deflection of section.
Described deformation-sensor is strain ga(u)ge formula extensometer, and front band on described gauge length post is corresponding with underframe to be set
The lower catch hoop put is fixed with laterally zygomorphic gag lever post respectively, and described gag lever post inner end side is provided with draws for restriction
Stretching the blade draw-in groove of meter blade edge position, two blades of strain ga(u)ge formula extensometer are connected in the blade draw-in groove of correspondence respectively,
Each gag lever post opposite side corresponding with blade draw-in groove is provided with anti-slip tank, in test process the two of strain ga(u)ge formula extensometer
Blade is fixed on gag lever post all the time, and the relative displacement transmitted by upper frame and underframe is obtained test specimen and makes a reservation for destroy the change of section
Shape amount.
The invention has the beneficial effects as follows:
(1) square section equal thickness dumbbell shape test specimen pattern is used can to reduce difficulty when pouring making concrete sample, save people
Power material resources.The cambered surface design of test specimen power transmission section two sides can ensure that during stretch-draw, tension (is made a reservation for destroy to test section by loaded segment
Section) uniformly transfer, it is to avoid at variable cross-section stress concentrate generation, rational test section design guarantee that the energy of rupture of test specimen is true
The essence of reflection concrete random fracture.
(2) specimen molding mould not only can ensure that configuration and the dimensional accuracy of test specimen, and easy accessibility, work efficiency
High.
(3) design of loading frame and load maintainer can be converted to press to load by test specimen pulls to loading, it is simple to
Test on usual pressure testing machine, make assembly of the invention have more the suitability.
(4) setting of rotating disk handle is not only convenient for the installation of test specimen, also allows for realizing manual loading.
(5) in test specimen stretch-draw clamping fixture, the ball pivot nest at clamping beam center and the ball pivot head of T-shaped clamp constitute a kind of adaptive
Answer spherical hinge structure, rationally clamping and stretch-draw to test specimen can be realized, eliminate moment of flexure and the moment of torsion of test specimen stretch-draw end, make predetermined broken
Tension in bad section is evenly distributed, it is ensured that the success rate of test thus obtain and can truly reflect concrete fracture destructive characteristics
Test parameters.
(6) deformation test fixture is applicable to the clamping to multiple portable deformation sensor, makes testing efficiency height, cost
Low.
(7) concrete direct tensile test complexes and the method for testing of the present invention is applicable not only to cement concrete examination
The direct tensile test of part, is also applied for the direct tensile test of cement mortar and other fragile materials.
Accompanying drawing explanation
Fig. 1 is the structural representation of concrete direct tensile test test specimen；
Fig. 2 is the installation diagram of concrete direct tensile test specimen molding mould；
Fig. 3 is the front view of base plate in concrete direct tensile test specimen molding mould；
Fig. 4 is the top view of base plate in concrete direct tensile test specimen molding mould；
Fig. 5 is the front view that in concrete direct tensile test specimen molding mould, chain closes side plate；
Fig. 6 is the top view that in concrete direct tensile test specimen molding mould, chain closes side plate；
Fig. 7 is loading frame and the structural representation of load maintainer in concrete direct tensile test complexes；
Fig. 8 is the structural representation of test specimen stretch-draw clamping fixture in concrete direct tensile test complexes；
Fig. 9 is the front view of test specimen deformation test fixture in concrete direct tensile test complexes in embodiment 1；
Figure 10 is the top view of test specimen deformation test fixture in concrete direct tensile test complexes in embodiment 1；
Figure 11 is the left view of test specimen deformation test fixture in concrete direct tensile test complexes in embodiment 1；
Figure 12 is the front view of test specimen deformation test fixture in concrete direct tensile test complexes in embodiment 2；
Figure 13 is the top view of test specimen deformation test fixture in concrete direct tensile test complexes in embodiment 2；
Figure 14 is the left view of test specimen deformation test fixture in concrete direct tensile test complexes in embodiment 2.
Detailed description of the invention
Embodiment 1:
Below in conjunction with Fig. 1 to Figure 11, the detailed description of the invention of the present invention is elaborated, the concrete uniaxial direct tensile of the present invention
Test test specimen, specimen molding mould and complexes, including concrete direct tensile test test specimen, concrete direct tensile test
Specimen molding mould and concrete direct tensile test complexes.
Concrete direct tensile test test specimen is square section equal thickness dumbbell shape tensile test piece, for concrete this non-all
Controlling, at simple stress of the discrete heterogeneous composite material of matter, defect that its destructive process is distributed by internal random and crack
The rupture failure point of the lower test specimen of effect has uncertainty, the information more valuable for obtaining concrete destruction behavior, it is necessary to make
The destruction of test specimen occurs in predetermined destruction section, and now, the structural shape of test specimen realizes the uniaxial direct tensile of concrete to success
Testing most important, it decides the probability of success of the test, the accuracy of result, testing efficiency, economy, also determine employing
Corresponding specimen molding mould and stretching mode, for achieving the above object, the present invention provides a kind of square section equal thickness dumbbell shape
Stretch-draw test specimen (such as Fig. 1).
As it is shown in figure 1, square section equal thickness dumbbell shape tensile test piece can be divided into four characteristic segments: strong section of A1(is by Fig. 1 side
Position be in the strong section of A1 on top be upper strong section, be in strong section of bottom and be under strong section), loaded segment A2(is by Fig. 1 orientation
Loaded segment A2 that loaded segment A2 being in top is upper loaded segment, be in bottom is lower loaded segment), power transmission section A3(is by Fig. 1 orientation
Power transmission section A3 that power transmission section A3 being in top is upper power transmission section, be in bottom is lower power transmission section) and test section (predetermined destroy
Section) A4.Test section (predetermined destroy section) a length of L, a length of 0.43L of power transmission section A3 of A4, loaded segment A2 a length of
0.43L, a length of 0.75L of strong section of A1.Each section of cross section is all square, and thickness is equal to length L of test section A4, cross section
Width is gradually increased to the 2L of strong section of A1 by the L of test section A4.Strong section of A1 designs sufficiently longitudinally length, it can be ensured that internal force
Uniformly transfer, it is to avoid end does not detects valid data because cleavage fracture is occurred to early.Loaded segment A2 lateral layout is and examination
Part longitudinally becomes the inclined-plane of 45 degree, not only convenient to test specimen stretch-draw, and be prone to make strong section of A1 end internal force (compressive stress with draw
Stress) reach equilibrium, unlikely because of long waste material, or because of too short, premature degradation phenomenon occurs.Power transmission section A3 two sides are designed
Being the cambered surface of R=0.6L for radius, cambered surface two end grain is loaded segment A2 and the side of test section A4, and interfaces transition smooths, this
Plant configuration and can ensure that tension is by loaded segment A2 uniformly transferring to test section A4, it is to avoid the stress at variable cross-section is concentrated.Test
Section A4 is the part that cross section is minimum, and during stretch-draw, the internal tension produced is maximum, so that the destruction that this section has maximum is general
Rate.Length, width and the thickness of described test section A4 are the most equal, and concrete size also will be according to raw material (such as aggregate
Maximum particle diameter) determine, so that the essence of concrete random fracture can be reacted, it is easy to again test the deformation in test specimen fracture process
Parameter is advisable.
Concrete direct tensile test test specimen based on the present invention, the concrete direct tensile test specimen molding of the present invention
Mould (such as Fig. 2 to Fig. 6), including two pieces of horizontal side plate B1, two pieces of longitudinal side plate B3 and one piece of base plate B7, wherein, by one block of horizontal side plate
B1 and one piece of longitudinal side plate B3 forms one group of chain by pivot pin B2 connection and closes side plate, thus forms two groups of chains and close side plates, and two groups of chains close
Side plate docking forms side form framework, and the end of one group of chain conjunction side plate horizontal side plate B1 can be inserted into another group chain and closes side plate longitudinal side plate B3 end
In the stopper slot B8 that portion is arranged, often the horizontal side plate B1 end outer side center of group chain conjunction side plate is provided with T-shaped side plate rotating shaft screw bolt B9,
T-shaped rotating shaft screw bolt B9 arranges wing nut, and another group chain closes the plate B3 end, longitudinal side of side plate and T-shaped rotating shaft screw bolt B9 correspondence position
Place is provided with U-shaped side plate bolt draw-in groove B10, and two groups of chains close side plate by the two T-shaped side plate rotating shaft screw bolt B9 of set and wing nuts
Carrying out fastening to couple, the surrounding side center of rectangle base plate B7 is outwards provided with a set of T-shaped base plate rotating shaft screw bolt B5 and butterfly
Shape nut, the corresponding position of every block of side plate is provided with U-shaped bed bolt draw-in groove B6, described bed bolt draw-in groove B6 and base plate
Base plate B7 and chain are closed side plate and couple for holistic specimen molding mould by the T-shaped base plate rotating shaft screw bolt B5 that B7 is arranged.
The configuration of described longitudinal side plate B3 is consistent with longitudinal side of stretch-draw test specimen 7, including strong section of A1, loaded segment A2, biography
Power section A3 and test section (predetermined destruction section) A4, the lateral wall of longitudinal side plate B3 is provided with groove B4, not only alleviates weight, it is possible to
As handle during carrying.
Described base plate B7 center arranges a step B11 according to the longitudinal cross-section size of test specimen 7, and side plate can be prevented along base plate
B7 sliding, it is to avoid produce dimensional discrepancy when pouring test specimen 7.
Concrete direct tensile test test specimen based on the present invention, the concrete direct tensile test complexes of the present invention
Including loading frame, load maintainer, test specimen stretch-draw clamping fixture, test piece deformation test fixture and data collecting system etc..This
Bright concrete direct tensile test complexes simple operation, environment-friendly high-efficiency, precision are high, low cost, and are applicable to various adding
Carrier strip part.
Loading frame plays the stable effect supported that provides load maintainer and test specimen stretch-draw clamping fixture etc.；Load maintainer
Pressure can be converted to pulling force, it is simple on usual pressure testing machine, use this device；Test specimen stretch-draw clamping fixture 17 can be complete
Eliminate moment of flexure and the moment of torsion of test specimen 7 end, improve success of the test rate；Deformation-sensor fixture 19 is easy to utilize conventional deformation to pass
Sensor 18 obtains the deformation values of test specimen 7；Utilize data collecting system can conveniently obtain cement mortar/concrete at tensile load
Bursting stress-strain full curve under Zuo Yong.
As it is shown in fig. 7, described loading frame includes left post 8, center pillar 9, right post 15, girder 2, guide beam 5 and base 10.Left
Post 8, center pillar 9 and right post 15 are consolidated on base 10, and guide beam 5 is consolidated on left post 8 and center pillar 9, girder 2 be consolidated in left post 8,
On center pillar 9 and right post 15, constitute the frame structure of entirety.Girder 2 and guide beam 5 left end vertical direction corresponding position respectively arrange one
The individual trepanning slided with guide effect places loading guide rod 6；Girder 2 right-hand member vertical direction arranges one through pull bar 14
Slide-and-guide trepanning；Arrange one at center pillar 9 central upper portion between girder 2 and guide beam 5 and be available for the side that lever 3 passes and rotates
Hole.
As it is shown in fig. 7, load maintainer includes loading guide rod 6, lever 3, spring (or antivibrator) 13, rotating shaft 4, rotating disk handle
11, nut 12, pull bar 14 and test specimen stretch-draw clamping fixture 17 etc. are loaded.Load guide rod 6 by vertical on girder 2 and guide beam 5
The slide-and-guide trepanning that direction is arranged is formed with loading frame and is slidably connected, and loads guide rod 6 top and arranges carrying cap 1, it is simple to executes
Add and press to load, load guide rod 6 and load can be passed to pull bar 14 by lever 3 along moving of pilot hole.Lever 3 passes through respectively
Rotating shaft 4 is connected with loading guide rod 6, center pillar 9 and pull bar 14, and lever 3 is equal with the connection holes of pull bar 14 with loading guide rod 6, lever 3
For slotted hole, to avoid lever 3 to make loading guide rod 6 and pull bar 14 produce lateral moment of flexure when rotating, and beneficially load is at the uniform velocity
Transmission；Lever 3 is circular hole with the connection holes of center pillar 8, and circular hole can make the stability that lever is maintained in vertical plane.In pull bar 14
Portion carries out axle by pivot pin with lever 3 and couples, and pull bar 14 upper end is by being arranged at slip guide hole and the master of vertical direction on girder 2
Beam 2 is slidably connected, and pull bar 14 stretches out the slide upper part of guide hole of girder 2 and is provided with external screw thread, arranges on externally threaded
End sleeve is provided with loading nut 12, loads nut 12 and is fixedly connected as entirety with rotating disk handle 11, and the rotation of rotating disk handle 11 can
Drive loading nut 12 is along pull bar 14 relative motion, owing to loading nut 12 loading frame relative with rotating disk handle 11 at Vertical Square
It is upwards static, thus, the rotation of the horizontal direction of rotating disk handle 11 translates into the motion of pull bar 14 vertical direction.Institute
State and be provided with bearing between the slip guide hole of loading nut 12 and girder 2, load the nut 12 cunning when girder 2 rotates to reduce
Kinetic frictional resistances.
In the middle part of pull bar 14, top side is provided with a disk, spring (or antivibrator) 13 can be limited in girder 2 and disk it
Between.During loading, load is passed to pull bar 14 by loading guide rod 6 by lever 3, and pull bar 14 is movable in a vertical direction, and passes through pivot pin
Drive test specimen stretch-draw clamping fixture 17 to make test specimen 7 stress with ball pivot connector 16, make spring (or antivibrator) 13 be pressed simultaneously
Contracting, the setting of spring (or antivibrator) 13 can facilitate the clipping operation to test specimen 7, when adjustable test piece 7 ruptures to a certain extent
Loading frame and the energy release rate of load maintainer.Two stretching ends of test specimen 7 respectively arrange a set of test specimen stretch-draw clamping fixture 17,
Often set test specimen stretch-draw clamping fixture 17 is respectively provided with hemispherical ball pivot hole corresponding at test specimen 7 centre pull axis, and ball pivot sets in hole
Place hinge fitting 16, the test specimen stretch-draw clamping fixture 17 of upper end is coupled with pull bar 14 by ball pivot connector 16, the examination of lower end
Part stretch-draw clamping fixture 17 is coupled with load transducer 18 by ball pivot connector 16.
The loading surface of described carrying cap 1 is sphere, and the stress that can make loading guide rod 6 is more reasonable, reduces force of sliding friction.
The brachium of described lever 3 master arm is more than the brachium of slave arm.
As shown in Figure 8, described test specimen stretch-draw clamping fixture 17 is main by connecting plate C1, limb plate C2, clamping beam C6, ball pivot head
C5, T-shaped clamp C4 and rubber slab C3 etc. form.Described connecting plate C1 rear and front end is fixedly connected with down the limb plate C2 of Y-shaped, limb plate
The downward left and right sides of C2 separates two limb arms, and limb arm end is provided with circular trepanning, the rotating shaft that clamping beam C6 is arranged by two ends
C8 is spacing in two circular trepannings of front and back's limb plate C2 limb arm, and can in circular trepanning around the shaft C8 freely rotatable.Clamping
It is provided with ball pivot nest in the middle of beam C6, it is fixing even by fore-set C7 that ball pivot head C5, ball pivot head C5 and T-shaped clamp C4 are set in ball pivot nest
Connect as entirety, the loading surface of T-shaped clamp C4 is provided with rubber slab C3, rubber slab C3 and can make test specimen and the clamping of T-shaped clamp C4
Face laminating closely, makes the load assignment of test specimen loaded segment A2 be more uniformly distributed；The outward flange of T-shaped clamp C4 is provided with postive stop baffle,
The angle that described postive stop baffle is formed with T-shaped clamp C4 clamping face is equal with the corner of test specimen corresponding position, makes T-shaped clamp C4 and examination
Part contact position can be the most identical；Clamping beam C6 drives the unitary rotation of T-shaped clamp C4 C8 to be around the shaft easy to extend into test specimen 7
In the test specimen stretch-draw clamping fixture 17 of the present invention and stepped up, the ball pivot nest at described clamping beam C6 center and ball pivot head C5 constitute one
Planting self adaptation clamp structure, this structure can make the clamping face of T-shaped clamp C4 keep more preferable collimation with the loading surface of test specimen, keeps away
Exempt from the generation of test piece end moment of torsion and moment of flexure.
The sphere center position of described self adaptation ball pivot head C5 is on the axle center of clamping beam C6 rotating shaft C 8.
As shown in Figures 9 to 11, described test piece deformation test fixture 19 includes upper frame and underframe, upper frame and lower frame
Frame all includes the fixed structure being made up of forelimb D6, left limb D2 and hind leg D13 and the movable structure being made up of right limb D7, fixed knot
The hind leg D13 right-hand member of structure and the rear end of right limb D7 are coupled by pivot pin D8, the forelimb D6 right-hand member of fixed structure and right limb D13 front end
Being coupled by lock pin D9, described lock pin D9 is arranged in the stopper slot of right limb D13 front end, and before and after stopper slot, sidewall arranges limited
The slip guide hole of lockmaking pin D9 position, is provided with handle in the middle of lock pin D9, the lock pin between handle and stopper slot rear wall
Being set with spring on bar, the right-hand member of described forelimb D6 is provided with latch channels D12 towards the side of lock pin D9, can during spring release
The tapered end D11 of lock pin D9 front end is pressed in described slot D12.The cross section of described lock pin D9 and slip guide hole is square,
It is also square for can preventing the rotation of lock pin D9 handle, described slot D12, and the longitudinal medial face of tapered end D11 is cambered surface, it is simple to by it
Press-in slot D12 is interior and is locked, and after lock pin D9 press-in slot D12, the right limb D7 of movable structure is i.e. with fixed structure composition integrally
Structural framing.Both sides, described left limb D2 medial surface center respectively arrange an addendum cone D1, and right limb D7 medial surface is provided centrally with examination
Part clamping thumbscrew D10, upper and lower frames is securely clamped in tested by two addendum cone D1 and a thumbscrew D10 respectively
On test specimen 7.Described upper frame left limb D2 and right limb D7 downside are fixedly connected with in the middle part of gauge length post D3, gauge length post D3 lateral wall and set
It is equipped with the clip D5 for clamping deformation-sensor 18, the clip on the left limb D2 and right limb D7 of described underframe and gauge length post D3
D5 corresponding position is also respectively arranged with clip D5, and described clip D5 is provided with butterfly trip bolt D4.
The length of described gauge length post D3 can be come really according to the concrete length of test specimen size and test section (predetermined destruction section) A4
Fixed.
Described upper frame and the movable right limb D7 of underframe can be around fixed structure 90-degree rotations, it is simple to try dumbbell shape stretch-draw
The test section A4 of part carries out clipping operation.
The deformation-sensor 18 of the present embodiment uses differential transformer type displacement meter (LVDT) 18A, the card on gauge length post D3
Hoop D5 by fixing the main body of 18A based on differential transformer type displacement, on underframe left limb D2 and right limb D7 setting left and right clip
D5 is used for fixing top board D14, and the ball of described differential transformer type displacement meter 18A test lead withstands on top board D14, is testing
Cheng Zhong, differential transformer type displacement meter 18A make ball contact with top board D14 by the flexible member of self all the time, thus record
The deflection of test specimen 7 loaded segment A4.
As it is shown in fig. 7, described data collecting system includes deformation-sensor 18, load transducer 20, controller 21, calculates
Machines 22 etc., two deformation-sensors 18 are clamped on deformation-sensor fixture 19, and the two ends up and down of load transducer 20 lead to respectively
Cross ball pivot head connector 16 to couple with test specimen stretch-draw clamping fixture 17 and base 10, load transducer 20 and deformation-sensor 18 points
Tong Guo not be connected with controller 21 by data cable, controller 21 is connected with computer 22 by data cable.Control in the present invention
Device 21 processed includes amplifier, A/D converter, microprocessor (CPU), memorizer, communication interface circuit etc., is prior art,
Repeat no more.
The method of testing of the concrete direct tensile test complexes of the present invention:
First assay device is placed on the pressurized cushion cap of pressure testing machine, makes carrying cap 1 and the pressure test of loading guide rod 6 upper end
The upper platen vertical centering of machine, is linked to a set of test specimen stretch-draw clamping fixture 17 on pull bar 14 by ball pivot head connector 16,
Another set of test specimen stretch-draw clamping fixture 17 first passes through ball pivot head connector 16 and links load transducer 20, and load transducer 20 leads to again
Crossing ball pivot head connector 16 to be linked in the ball-and-socket of base 10, rotate clockwise rotating disk handle 11, rotating disk handle 11 drives and loads
Pull bar 14 is upwards screwed out by nut 12, and pull bar 14 drives test specimen stretch-draw clamping fixture 17 to move up, and makes upper and lower two set test specimens open
Draw and between clamping fixture 17, leave the space being easily installed test specimen 7, the self adaptation folder of test specimen stretch-draw clamping fixture 17 above adjustment
Holding structure makes it clamp test specimen 7, rotates counterclockwise rotating disk handle 11, makes pull bar 14 drive to be provided with the test specimen stretch-draw of test specimen 7
Clamping fixture 17 moves down, and till making test specimen 7 can conveniently stretch in the test specimen stretch-draw clamping fixture 17 of lower section, adjusts certainly
Adapting to clamp structure makes upper and lower two set test specimen stretch-draw clamping fixtures 17 simultaneously clamp on test specimen 7, is pressed from both sides by test piece deformation test fixture 19
Holding in the test section A4 of test specimen 7, deformation-sensor 18 is fixed on described test piece deformation test fixture 19, adjusts top board D14
Position make deformation-sensor 18 be in suitable range, respectively by deformation-sensor 18 and load transducer 20 and data acquisition
Collecting system connects, and opens data acquisition software, confirms that data collecting system rotates clockwise rotating disk handle 11 after normal, makes up and down
Two set test specimen stretch-draw clamping fixtures 17 can just clamp test specimen 7, and makes load signal be shown as zero.Hereafter, pressure can be started simultaneously
Force tester and data collecting system are tested.
Embodiment 2:
See Fig. 1 to Fig. 8 and Figure 12 to 14.Embodiment 2 and embodiment 1 are at concrete direct tensile test test specimen and shaping mould thereof
Tool, and the most identical with the concrete direct tensile test complexes aspect that test specimen structural shape adapts, and embodiment 2 is distinguished
Technical characteristic in embodiment 1 is, deformation-sensor uses strain ga(u)ge formula extensometer 18B, on upper frame gauge length post D3
The clip D5 that clip D5 and underframe are correspondingly arranged is used to fixing gag lever post D15, and side, described gag lever post D15 end is provided with
For limiting the blade draw-in groove D16 of extensometer blade edge position, corresponding opposite side is provided with and prevents from clamping the anti-slip tank that thing comes off
D17, but described clamping thing rubber band or spring, in test process, the blade of strain ga(u)ge formula extensometer 18B all the time by
It is fixed on gag lever post D15, and the relative displacement transmitted by upper frame and underframe is obtained test specimen and makes a reservation for destroy the deformation of section
Amount.
Embodiment 3:
See Fig. 1 to Fig. 8.Under conditions of having universal testing machine, directly a set of test specimen stretch-draw clamping fixture 17 can be passed through ball
Hinge head connector 16 links the upper jaw of testing machine, and another set of test specimen stretch-draw clamping fixture 17 first passes through ball pivot head connector 16 chain
Connecing load transducer 20, load transducer 20 links the lower jaw of testing machine again by ball pivot head connector 16, adjusts omnipotent examination
Test the position of machine crossbeam making test specimen 7 be clamped in upper and lower two set test specimen stretch-draw clamping fixtures 17 and make payload values is zero.Connect
Data collecting system can complete load test by the Auto Loader of universal testing machine, completes data by acquisition system
Record and later stage process, described data collecting system and being integrated in the test control software of universal testing machine.
Embodiment 1, embodiment 2 and embodiment 3 only in order to illustrative not limiting technical scheme, change the concrete of test specimen
Specification, changes strong section of A1 of test specimen, loaded segment A2, different size ratio that power transmission section A3 is different with test section A4, changes girder
2, the connected mode of the loading frame that guide beam 5, left post 8, center pillar 9, right post 15 and base 10 are constituted and concrete specification and structure,
Change the connected mode of the load maintainer loading the composition such as guide rod 6, lever 3, pull bar 14, rotating shaft 4 and concrete specification and structure, change
Become the examination being made up of the C1 that wins in succession, limb plate C2, rubber slab C3, T-shaped clamp C4, ball pivot head C5, clamping beam C6, fore-set C7, rotating shaft C 8
The connected mode of part stretch-draw clamping fixture 17 and concrete specification and structure, change as connected by the ball pivot of clamping beam C6 and fore-set C7
Connecting for rotating shaft, the position etc. changing lever 3 intermediate rotary shaft 4 all can form multiple embodiment, is the common change of the present invention,
Describe in detail the most one by one at this.
Verification experimental verification:
The concrete direct tensile test complexes of the employing present invention and method of testing test the pull resistance of normal concrete
Energy.Profile test and result in this example are as follows:
Raw material is the Portland cement of 42.5 grades, II grade of flyash, and particle diameter is the limestone gravel of 5-20mm, fineness mould
Number is thick fluvial sand, high-efficiency water-reducing agent of poly-carboxylic acid, tap water in 3.0.The folk prescription match ratio of normal concrete is shown in Table 1.
The method that test basis national standard " standard for test methods of mechanical properties of ordinary concrete " GB/T500081-2002 specifies
Carry out.It is 100mm × 100mm × 100mm that the square section equal thickness dumbbell shape test specimen used makes a reservation for destroy the size of section, strong section
Size be length × width x thickness=30mm × 200mm × 100mm.During test material preparation, the mixture meeting workability requirement is poured into
Specimen molding mould, then form removal in 24 hours numbering in rest chamber, carries out uniaxial direct tensile after putting into standard curing room maintenance 28 days
Test, often 9 test specimens of group, result of the test is shown in Table 2.
By the result of the test in table 2 it can be seen that utilize the concrete direct tensile test tensile test specimen of the present invention, mould
And complexes can conveniently record normal concrete stress and strain value, the coefficient of variation of surveyed intensity level is 5.4%, test essence
Spend higher.
Above example is only in order to illustrative not limiting technical scheme, although with reference to above-described embodiment to this
Bright be described in detail, it will be understood by those within the art that: still the present invention can be modified or etc.
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should contain the power in the present invention
In the middle of profit claimed range.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", "front", "rear", "left", "right",
Orientation or the position relationship of the instruction such as " vertically ", " level ", " top ", " interior ", " outward " are based on orientation shown in the drawings or position
Relation, is only to describe rather than instruction or infer the device of indication or element must have for ease of describing the present invention and simplifying
Specific orientation, for specific azimuth configuration and operation, thus it is not intended that the present invention to be protected the restriction of content.
Claims (10)
1. concrete direct tensile test test specimen, it is characterised in that: described test specimen is square section equal thickness dumbbell shape tensile test piece,
It is from top to bottom followed successively by strong section, upper loaded segment, upper power transmission section, test section, lower power transmission section, lower loaded segment and under strong
Section, test section is predetermined destruction section；The cross section of each section is all square, and section thickness is the most equal, and cross-sectional width is by making a reservation for
Destroy the most strong section of section and under strong section be gradually increased；Upper loaded segment is disposed as with lower loaded segment side longitudinally becoming with test specimen
Being not more than the inclined-plane of 45 degree, upper power transmission section two sides are set to cambered surface, and cambered surface two end grain is loaded segment and makes a reservation for broken
The side of bad section, upper power transmission section two sides seamlessly transit with the linkage interface of upper loaded segment and the predetermined side destroying section, pass down
Power section two sides are set to cambered surface, and cambered surface two end grain is lower loaded segment and the predetermined side destroying section, lower power transmission section two
Side seamlessly transits with the linkage interface of lower loaded segment and the predetermined side destroying section.
2. concrete direct tensile test specimen molding mould, the die cavity of this test piece mould and the test specimen phase described in claim 1
It is corresponding, it is characterised in that: described specimen molding mould includes side form framework and base plate；Side form framework is closed side plate docking by two groups of chains
Being formed, often group chain conjunction side plate is articulated and connected forms by horizontal side plate and longitudinal side plate, often the corresponding position of the longitudinal side plate of group chain conjunction side plate
The place of putting is provided with stopper slot, and during docking, the end of one group of chain conjunction horizontal side plate of side plate is inserted another group chain conjunction side plate and indulged side end
In the stopper slot arranged；
Often the horizontal side end outer side center of group chain conjunction side plate is provided with side plate rotating shaft screw bolt, and side plate rotating shaft screw bolt arranges locking screw
Mother, often the vertical side end of group chain conjunction side plate is provided with side plate bolt draw-in groove, two groups of chains with described rotating shaft screw bolt corresponding position
Closing side plate to be fastenedly connected by two set side plate bolt draw-in grooves, side plate rotating shaft screw bolt and locking nut, during docking, one group of chain closes
The side plate rotating shaft screw bolt of the horizontal side plate of side plate snaps in the side plate bolt draw-in groove that another group chain closes side plate longitudinal side plate；
The surrounding side center of base plate is outwards provided with base plate rotating shaft screw bolt, and base plate rotating shaft screw bolt arranges locking nut, side form
On the horizontal side plate of every block of framework and longitudinal side plate, base plate rotating shaft screw bolt corresponding position is provided with bed bolt draw-in groove, the described end
Base plate and side form framework are connected as holistic specimen molding mould by the base plate rotating shaft screw bolt that crab bolt draw-in groove and base plate are arranged,
During connection the base plate rotating shaft screw bolt of base plate snap in side form framework bed bolt draw-in groove in.
Concrete direct tensile test specimen molding mould the most according to claim 2, it is characterised in that: described often organize chain
The configuration of the longitudinal side plate closing side plate is consistent with longitudinal side of described test specimen；Be provided with step on described base plate, step shape with
The longitudinal cross-section of described test specimen is corresponding.
4. concrete direct tensile test complexes, described complexes include matching with test specimen described in claim 1
Test specimen stretch-draw clamping fixture, it is characterised in that: described test specimen stretch-draw clamping fixture include connecting plate, limb plate, clamping beam, ball pivot head and
T-shaped clamp；
Before and after described connecting plate inner end, side is fixedly connected with the limb plate having down Y-shaped, and each limb plate divides the left and right sides all downwards
Going out two limb arms, limb arm end is provided with circular trepanning, the front and back corresponding limb of the corresponding limb arm in the left side two of side limb plate and right side two
Clamping beam it is provided with, spacing two circles at front and back's side limb plate correspondence limb arm of rotating shaft that clamping beam is arranged by two ends between arm
In shape trepanning, clamping beam is rotationally connected with circular trepanning by rotating shaft；It is provided with ball pivot nest in the middle of clamping beam, arranges in ball pivot nest
Ball pivot head, ball pivot head is fixedly connected as entirety, the clamping face of the T-shaped clamp in left and right two and described test specimen with T-shaped clamp by fore-set
Upper loaded segment or lower loaded segment two sides laminating.
Concrete direct tensile test complexes the most according to claim 4, it is characterised in that: it also includes that test specimen becomes
Shape test fixture, described test piece deformation test fixture include upper frame and underframe, upper frame and underframe all include by forelimb,
Left limb and the fixed structure of hind leg composition and the movable structure that is made up of right limb, the hind leg right-hand member of fixed structure and the rear end of right limb
Being articulated and connected, forelimb right-hand member and the right limb front end of fixed structure are connected by lock pin, and described lock pin is arranged on the limit of right limb front end
In the groove of position, before and after stopper slot, sidewall is provided with the slip guide hole limiting lock pin position, is provided with handle, between handle in the middle of lock pin
Being set with back-moving spring on lock pin bar between hands and stopper slot rear wall, described forelimb right part is arranged towards the side of lock pin
Having the latch channels corresponding with lock pin, after lock pin press-in slot, the right limb of movable structure is i.e. tied with fixed structure group all-in-one-piece
Structure framework；Described left limb medial surface is disposed with at least two addendum cone, and right limb medial surface is provided centrally with specimen holder screw,
Specimen holder screw passes on the left of right limb and the sensing of its top；
Upper frame and underframe all by two addendum cones and a specimen holder screw clamping at the test section of described test specimen；
The left limb of upper frame and right limb downside have been fixedly connected with gauge length post, and gauge length post lateral wall is provided with front band, lower frame
The left limb of frame and right limb are respectively arranged with lower catch hoop, front band and lower catch hoop with the clip corresponding position on gauge length post and constitute change
Shape clamp of sensor.
Concrete direct tensile test complexes the most according to claim 5, it is characterised in that: it also includes loading frame
Frame and load maintainer, left post that described loading frame includes being sequentially arranged from left to right, center pillar and right post and the most successively
Girder, guide beam and the base arranged, Zuo Zhu, center pillar and right post be consolidated on base, and guide beam is consolidated on left post and center pillar,
Girder is consolidated on left post, center pillar and right post, and on the left of girder and guide beam, place is arranged in vertical the most corresponding guide rod
Slide-and-guide trepanning；On the right side of girder, place has been arranged in vertical pull bar slide-and-guide trepanning；Center pillar is positioned at girder and guide beam
Between cylinder center be provided with lever square hole；
Described load maintainer includes loading guide rod, lever, rotating shaft, rotating disk handle, loading nut and pull bar, loads guide rod and passes through institute
Stating guide rod slide-and-guide trepanning to be slidably connected with loading frame formation, load guide rod top and arrange carrying cap, lever passes through respectively
Rotating shaft is articulated and connected with loading guide rod, center pillar and pull bar, and lever is oval with loading guide rod, lever with the connecting hole of pull bar
Hole, the connecting hole of lever and center pillar is circular hole, is articulated and connected with lever by pivot pin in the middle part of pull bar, pull bar upper end pass described in draw
Bar slide-and-guide trepanning is also slidably connected with girder, and pull bar stretches out the upper part of girder slip guide hole and is provided with external screw thread, if
Put and at the externally threaded body of rod, be arranged with loading nut；
The upper loaded segment of described test specimen and lower loaded segment position respectively arrange a set of described test specimen stretch-draw clamping fixture, upper loaded segment
Described test specimen stretch-draw clamping fixture setting symmetrical above and below at the described test specimen stretch-draw clamping fixture at place and lower loaded segment, often overlaps examination
The outer end of the connecting plate of part stretch-draw clamping fixture is provided with hemispherical ball pivot hole corresponding at described test specimen centre pull axis,
Arranging ball pivot connector in hemispherical ball pivot hole, the test specimen stretch-draw clamping fixture at upper loaded segment is by corresponding ball pivot connector
Being connected with pull bar, the test specimen stretch-draw clamping fixture at lower loaded segment is connected with load transducer by corresponding ball pivot connector.
Concrete direct tensile test complexes the most according to claim 6, it is characterised in that: it also includes data acquisition
Collecting system, described data collecting system includes load transducer, deformation-sensor, controller, computer, two deformation-sensors
Being clamped on the deformation-sensor fixture of correspondence, the upper end of load transducer is by corresponding ball pivot connector and corresponding test specimen
Stretch-draw clamping fixture connects, and the lower end of load transducer is connected with described base, and load transducer and deformation-sensor lead to respectively
Crossing data cable to be connected with controller, controller is connected with computer by data cable.
Concrete direct tensile test complexes the most according to claim 7, it is characterised in that:
It is provided with cushion on the clamping face of described T-shaped clamp；
The outward flange of described T-shaped clamp is provided with postive stop baffle, the angle that described postive stop baffle is formed with T-shaped clamp clamping face with
The corner of described test specimen corresponding position is equal；
It is provided with trip bolt on described deformation-sensor clip；
The cross section of described lock pin and slip guide hole is square, and described slot is also square, the longitudinal direction of the tapered end of described lock pin
Medial surface is cambered surface；
Load the connection of nut extenal fixation and have rotating disk handle, load and be provided with bearing between the slip guide hole of nut and girder；
In the middle part of pull bar, at top side, fixed cover is provided with disk, and buffer unit is located at the position on lever between girder and disk
Place；
Described buffer unit is spring or antivibrator；
Described base and corresponding position, load transducer lower end are also equipped with hemispherical ball pivot hole, arrange in hemispherical ball pivot hole
Ball pivot connector, the lower end of load transducer is connected with described base by corresponding ball pivot head connector.
Concrete direct tensile test complexes the most according to claim 7, it is characterised in that: described deformation-sensor
For differential transformer type displacement meter, the front band on described gauge length post is the main body of fixing differential transformer type displacement meter, corresponding
Lower catch hoop fix top board, the ball of differential transformer type displacement meter test lead withstands on top board, differential transformation in test process
Device formula displacement meter makes ball and top plate contact all the time by the flexible member of self, relative with what underframe transmitted by upper frame
Displacement obtains test specimen and makes a reservation for destroy the deflection of section.
Concrete direct tensile test complexes the most according to claim 7, it is characterised in that: described deformation sensing
Device is strain ga(u)ge formula extensometer, and the lower catch hoop that front band on described gauge length post and underframe are correspondingly arranged is fixed respectively
Laterally zygomorphic gag lever post, described gag lever post inner end side is had to be provided with the blade card for limiting extensometer blade edge position
Groove, two blades of strain ga(u)ge formula extensometer are connected in the blade draw-in groove of correspondence respectively, each gag lever post and blade draw-in groove
Corresponding opposite side is provided with anti-slip tank, and in test process, two blades of strain ga(u)ge formula extensometer are fixed on gag lever post all the time
On, the relative displacement transmitted by upper frame and underframe is obtained test specimen and makes a reservation for destroy the deflection of section.
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