CN106289977A - A kind of peg Analysis of Concrete Tensile assay device and test method - Google Patents

A kind of peg Analysis of Concrete Tensile assay device and test method Download PDF

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Publication number
CN106289977A
CN106289977A CN201610673854.5A CN201610673854A CN106289977A CN 106289977 A CN106289977 A CN 106289977A CN 201610673854 A CN201610673854 A CN 201610673854A CN 106289977 A CN106289977 A CN 106289977A
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CN
China
Prior art keywords
peg
plate
concrete
cavity
analysis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610673854.5A
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Chinese (zh)
Inventor
邹传龙
莫莾
陈艳艳
梁丽君
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Nanning University
Nanning Institute
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Nanning Institute
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Publication date
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Priority to CN201610673854.5A priority Critical patent/CN106289977A/en
Publication of CN106289977A publication Critical patent/CN106289977A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G01N2001/2873Cutting or cleaving
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001Type of application of the stress
    • G01N2203/0005Repeated or cyclic
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0017Tensile

Abstract

The invention discloses a kind of peg Analysis of Concrete Tensile assay device and test method, assay device includes base and measurement and positioning part, described base comprises parallel upper head plate (1) and bottom plate (2), connector (4) it is vertically connected with between upper head plate (1) and bottom plate (2), cavity (3) is had in connector (4), all have through hole on upper head plate (1) and bottom plate (2), and through hole connects with cavity (3);Having a plane (6) on described measurement and positioning part (5), described plane (6) length is more than or equal to bottom plate (2) length, and described plane (6) center has hole.During tension test, peg (9) is put in cavity (3) and fill concrete, then carry out extension test.The present invention can assess the peg concrete system tensile property under the conditions of test different parameters, and the failure mechanism for research peg concrete further lays the first stone.

Description

A kind of peg Analysis of Concrete Tensile assay device and test method
Technical field
The present invention relates to the tension test under peg and concrete effect system, belong to mechanics properties testing field.
Background technology
Peg (electric arc stud welding socket cap weldering nail) is as the most commonly used connector in current engineering construction field, with it Easy construction, the feature that cost is low is that numerous engineers and technicians know.At present, the research to peg is concentrated mainly on and is made For shear connector aspect, analyze its anti-shear performance and failure mechanism, and peg itself be limited only to for tensile property, Have ignored its concrete working environment, i.e. peg to be typically to interact with concrete.
Progressively promoting fabricated construction in building trade along with country, the design of concrete prefabricated element can increasingly Many, become increasingly complex, the peg of connector and the effect system of concrete will be related among these, this is accomplished by considering As the peg of the connector mechanics property analysis when with concrete effect, such as with different strength concrete effect, And for example with the xoncrete structure effect of different cross section, take the lead for another example or bare headed or threaded different peg and coagulation Soil effect etc., these are required for doing strict test, it is also necessary to take into account that the buried depth of peg, peg cross section and concrete in test The variablees such as the ratio in cross section, and existing test apparatus and method are also not involved with the problems referred to above.
Chinese patent CN203606214U (2014.05.21) discloses a kind of welding screw tension test clamping device, its By welding, peg is fixed on test specimen, then clamps test specimen by pressing plate and base plate, thus complete drawing process.
Chinese patent CN103234814B (2015.09.30) discloses a kind of welding of peg tensile test fixture and draws Stretching method, peg top fixed by clamping breach, and Interal fixation is passed through in bottom, thus completes drawing process.
Chinese patent CN201765073U (2011.03.16) discloses a kind of pin detecting device, and this device passes through wedge Block, screw and upper and lower loading head realize the stretching detection of peg.
Therefore, stretching stress is also the factor causing this attachment structure to lose efficacy, and a set of is applicable to peg so designing It is necessary with the tensile test apparatus of xoncrete structure and test method for studying its failure mechanism.
Summary of the invention
The technical problem to be solved in the present invention is: provides a kind of peg Analysis of Concrete Tensile assay device and test method, comments (such as cavity cross section is different, and strength grade of concrete is different, peg cross section and concrete section for estimation examination different parameters condition Ratio is different, and peg buried depth is the most equal) under peg concrete system tensile property, study the inefficacy of peg concrete further Mechanism.
Technical scheme is as follows:
A kind of peg Analysis of Concrete Tensile assay device, including base and measurement and positioning part, described base comprises parallel upper End plate and bottom plate, be vertically connected with connector between upper head plate and bottom plate, has cavity, upper head plate and bottom plate in connector On all have through hole, and through hole connects with cavity;A plane is had, under described plane length is more than or equal on described measurement and positioning part Endplate lengths, described planar central has hole.
The cross section outline of described upper head plate and bottom plate is circular or regular polygon.
Described connector is assembly, is i.e. divided into upper and lower two combiners, is connected by screw thread or pin etc..
The outline of described connector cross section is circular or regular polygon.
Further, the cross section of connector is variable cross-section or uiform section, and its wall thickness is definite value or non-definite value.
Described cavity is the uiform section cavity of through-connections upper and lower end face, and described cross section is circular or regular polygon.
Further, cavity is section cavities.
Described measurement and positioning part longitudinal section is ⊥ shape, and its vertical edge has connection fixing hole.
It is displacement meter between upper surface and the plane of measurement and positioning part of described bottom plate.
Use between upper head plate and bottom plate and connector and be weldingly connected.
A kind of peg using above-mentioned tensile test apparatus draws Analysis of Concrete Tensile test method, comprises the following steps:
1. sample preparation, posts peg one end of foil gauge and inserts in cavity, then in cavity through the through hole of upper head plate Casting concrete is until concrete upper surface is concordant with the upper surface of upper head plate, and the other end of peg passes the flat of measurement and positioning part Hole on face is the most fixed thereto, is symmetrical arranged two displacement meters about peg between plane and bottom plate, and whole process guarantees bolt The axis of nail and the axis of upper head plate, bottom plate and cavity overlap;
2. fill sample, the free end of peg be connected with the upper grip of universal tensile testing machine, bottom plate by steel pipe with under Chuck connects;
3. loading, in elastic range, 1/4,2/4,3/4 load with peg yield load carries out repeat stretch-draw to peg Loading, unload repeatedly (such as 3 times, 4 times, concrete number of times can adjust according to EXPERIMENTAL DESIGN), then stretch-draw is until peg destroys.
4. sample cutting, cuts open connector (outer wall cutting connector the most vertically), complete in retaining cavity Xoncrete structure.
In sample preparation step, described foil gauge includes two groups of foil gauges of axial and circumferential, and described peg includes that light is round and spiral shell Stricture of vagina type (i.e. whether bar portion is threaded, the most threaded round for light).
In sample preparation step, select a series of combination sample preparations that upper head plate through-hole aperture is different from cavity cross section diameter ratio.
Peg is combined with concrete by the present invention by base, by converting the cross sectional shape of connector cavity, or on End plate through-hole aperture and cavity cross section diameter ratio, or strength grade of concrete, or peg buried depth, or peg cross section is with mixed Coagulate the ratio in soil cross section, or the parameters such as the degree of depth bought in by peg, thus (light is round to obtain dissimilar peg under different condition Or screw-type) tension failure numerical value, for studying fracture mechanism under peg-concrete system further, set up failure model and beat Lower basis.
Accompanying drawing explanation
Fig. 1 is the tensile test apparatus structural representation of the present invention;
Fig. 2 is that in the present invention, connector cross section is circular and cavity cross section is tensile test apparatus schematic diagram during circle;
Fig. 3 is the exploded perspective view of Fig. 2;
Fig. 4 is the peg structure schematic diagram of multi-form;
Fig. 5 and Fig. 6 is connector and the cavity structure schematic diagram of multi-form.
Detailed description of the invention
As it is shown in figure 1, be the basic pie graph of tensile test apparatus of the present invention, including base and measurement and positioning part 5, base Comprise parallel upper head plate 1 and bottom plate 2, upper head plate 1 and bottom plate 2 to be one piece of center and open the rectangle steel plate in hole, on Being vertically connected with connector 4 between end plate 1 and bottom plate 2, connector 4 is steel pipe, cavity in connector 43 and upper head plate 1 and Through hole connection on bottom plate 2, be threaded in the through hole of bottom plate 2 (during stretching, can be by a screwed steel of radicle Pipe or rod iron screw in wherein, are then connected with the lower chuck of stretching-machine);Measurement and positioning part 5 be one piece of longitudinal section be the steel of ⊥ shape Matter component, lower surface is plane 6, and equal to bottom plate 2 length, (length here refers in structural member three-dimensional dimension plane 6 length Maximum size), plane 6 center has hole, for through peg 9.Have on the vertical edge of ⊥ shape measurement and positioning part 5 row about Centrosymmetric circular hole.
As in figure 2 it is shown, upper head plate 1, steel tubular connector 4 and bottom plate 2 welding are constituted base, moulding is similar to coiling Dish, it is ensured that the central axis of steel tubular connector 4 overlaps with the centrage of upper and lower end plate.Divide close to 4 vertex angle parts on bottom plate 2 Have bolt connecting hole.When preparing sample, selecting light round or screw-type peg 9, sticking axial and circumferential in peg 9 bar portion should Become sheet 13, by its head one end in the through hole of upper head plate 1 puts into the cavity 3 of steel tubular connector 4, then water in cavity 3 Build concrete, the flush of plane and upper head plate 1 on concrete, to be solidified after, utilize the bolt at bottom plate 2 four end angle Hole and bolt thereunder reconnect one piece of bottom plate 2 with size, utilize in bottom plate 2 through hole threaded one with band outside The rod iron 10 of screw thread.Place a pair displacement meter 8 on the upper surface of bottom plate 2 and in the both sides of connector 4, use a pair C clamp Two coinciding edges of 11 two pieces of bottom plate 2 non-displacement meters 8 of clamping.The top of peg 9 is through the plane of measurement and positioning part 5 lower end The hole of 6 centers, and fix with the connection fixing hole 7 on securing member 12 fitted bolt and vertical edge, guarantee displacement time fixing Fit with the plane 6 of measurement and positioning part 5 and the upper surface of bottom plate 2 respectively in meter about 8 two ends.The free end of peg 9 and stretching The upper grip of testing machine connects, and rod iron 10 is connected with lower chuck.
When preparing sample, optional different types of parameter combination, including following aspect:
The most different types of peg 9, such as light is round and screw-type, as shown in Figure 4;
2. the outer wall profile (uiform section or variable cross-section) of connector 4 is different or wall thickness is different, cross sectional shape (etc. of cavity 3 Cross section or variable cross-section) different, such as Fig. 5 and Fig. 6;
3. the upper surface external diameter of cavity 3 is serial from the different ratio of external diameter of upper head plate 1 central through hole;
4. during peg 9 inserts connector 4, the degree of depth is different;
5. the diameter of peg 9 and connector 4 minimum outer diameter different ratio series.
6. different strength grade of concrete.
Above parameter can any mashed up combination, the most 1. and 2., 5., 3. and 4. etc..
During tensile loads, in elastic range, peg 9 is carried out heavily by 1/4,2/4,3/4 load with peg 9 yield load Multiple stretch-draw loads, unloading repeatedly (such as 3 times, 4 times, concrete number of times can adjust according to EXPERIMENTAL DESIGN), then stretch-draw is until peg Destroy.Two displacement meters 8 are used to be detected the result meansigma methods obtained as the shift value tested.After stretching terminates, will connect Part 4 is cut open, observes the failure conditions of cavity 3 inner concrete.
Draw initial stiffness, yield strength, tensile strength, maximum displacement by the tension test combination that design is different, break The data such as bad form, then analysis modeling, the failure model setting up peg with xoncrete structure of deriving.

Claims (10)

1. a peg Analysis of Concrete Tensile assay device, it is characterised in that: include base and measurement and positioning part (5), described base Comprise parallel upper head plate (1) and bottom plate (2), between upper head plate (1) and bottom plate (2), be vertically connected with connector (4), even Have in fitting (4) on cavity (3), upper head plate (1) and bottom plate (2) and all have through hole, and through hole connects with cavity (3);Described Having a plane (6) on measurement and positioning part (5), described plane (6) length is more than or equal to bottom plate (2) length, in described plane (6) The heart has hole.
A kind of peg Analysis of Concrete Tensile assay device the most according to claim 1, it is characterised in that: described upper head plate (1) It is circular or regular polygon with the cross section outline of bottom plate (2).
A kind of peg Analysis of Concrete Tensile assay device the most according to claim 1, it is characterised in that: described connector (4) The outline of cross section is circular or regular polygon.
A kind of peg Analysis of Concrete Tensile assay device the most according to claim 1, it is characterised in that: described cavity (3) is The uiform section cavity of through-connections (4) upper and lower end face, described cross section is circular or regular polygon.
A kind of peg Analysis of Concrete Tensile assay device the most according to claim 1, it is characterised in that: described measurement and positioning part (5) longitudinal section is ⊥ shape, and its vertical edge has connection fixing hole (7).
A kind of peg Analysis of Concrete Tensile assay device the most according to claim 1, it is characterised in that: described bottom plate (2) Upper surface and the plane (6) of measurement and positioning part between be displacement meter (8).
A kind of peg Analysis of Concrete Tensile assay device the most according to claim 1, it is characterised in that: upper head plate (1) and under Use between end plate (2) and connector (4) and be weldingly connected.
8. the peg using tensile test apparatus described in claim 6 draws Analysis of Concrete Tensile test method, it is characterised in that Comprise the following steps:
1. sample preparation, posts peg (9) one end of foil gauge and inserts in cavity (3), then to sky through the through hole of upper head plate (1) Chamber (3) interior casting concrete is until concrete upper surface is concordant with the upper surface of upper head plate (1), and the other end of peg (9) passes Hole in the plane (6) of measurement and positioning part is the most fixed thereto, is symmetrical arranged about peg (9) between plane (6) and bottom plate (2) Two displacement meters (8), whole process guarantees axis and upper head plate (1), bottom plate (2) and the axis of cavity (3) of peg (9) Line overlaps;
2. fill sample, the free end of peg (9) be connected with the upper grip of universal tensile testing machine, bottom plate (2) by steel pipe with Lower chuck connects;
3. loading, in elastic range, peg (9) is repeated to open by 1/4,2/4,3/4 load with peg (9) yield load Drawing loading, unloading repeatedly, then stretch-draw is until peg (9) destroys.
A kind of peg Analysis of Concrete Tensile test method the most according to claim 8, it is characterised in that: in sample preparation step, institute Stating foil gauge and include two groups of foil gauges of axial and circumferential, described peg (9) includes that light is round and screw-type.
A kind of peg Analysis of Concrete Tensile test method the most according to claim 8, it is characterised in that: in sample preparation step, choosing Select a series of combination sample preparations that upper head plate (1) through-hole aperture is different from cavity (3) diameter of section ratio.
CN201610673854.5A 2016-08-15 2016-08-15 A kind of peg Analysis of Concrete Tensile assay device and test method Pending CN106289977A (en)

Priority Applications (1)

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CN201610673854.5A CN106289977A (en) 2016-08-15 2016-08-15 A kind of peg Analysis of Concrete Tensile assay device and test method

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Application Number Priority Date Filing Date Title
CN201610673854.5A CN106289977A (en) 2016-08-15 2016-08-15 A kind of peg Analysis of Concrete Tensile assay device and test method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107831081A (en) * 2017-11-24 2018-03-23 潍坊科技学院 A kind of detection method and multifunctional detecting device of agricultural facility structure herringbone frame connector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107831081A (en) * 2017-11-24 2018-03-23 潍坊科技学院 A kind of detection method and multifunctional detecting device of agricultural facility structure herringbone frame connector

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