CN106996895A - The experimental provision of concrete dynamic shear strength is calculated using Hopkinson pressure bar - Google Patents
The experimental provision of concrete dynamic shear strength is calculated using Hopkinson pressure bar Download PDFInfo
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- CN106996895A CN106996895A CN201710306840.4A CN201710306840A CN106996895A CN 106996895 A CN106996895 A CN 106996895A CN 201710306840 A CN201710306840 A CN 201710306840A CN 106996895 A CN106996895 A CN 106996895A
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- concrete
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- type baffle
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to ionization meter field, and in particular to a kind of utilization Hopkinson pressure bar calculates the experimental provision of concrete dynamic shear strength.Technical scheme is as follows：The experimental provision of concrete dynamic shear strength, including staving, clip and two disc-type baffle plates are calculated using Hopkinson pressure bar, the staving includes being provided with chute in two semicircle bucket walls, the semicircle bucket wall；The clip includes the thin folder of two semicircles, and the thin folder of semicircle is connected as one by screw bolt and nut, and the clip is used to clamp the staving；The edge of the disc-type baffle plate is arranged with two auricles, and the auricle is positioned in the chute；One middle side part of the disc-type baffle plate is provided with chuck, and two semicylinder concrete samples are placed between two disc-type baffle plates, and semicylinder concrete sample is connected in the chuck.The present invention can be tested and calculated to the dynamic shear strength of concrete.
Description
Technical field
The present invention relates to ionization meter field, and in particular to one kind calculates the dynamic shearing resistance of concrete using Hopkinson pressure bar
The experimental provision of intensity.
Background technology
The dynamic shear behavior of concrete is a kind of important performance of concrete, the shear behavior test office of current concrete
It is limited to static shear, and dynamic test is confined to dynamic compression and dynamic splitting test, it is necessary to which a kind of experimental rig is to concrete
Dynamic shear strength tested and calculated.
The content of the invention
The present invention provides the experimental provision that a kind of utilization Hopkinson pressure bar calculates concrete dynamic shear strength, can be right
The dynamic shear strength of concrete is tested and calculated.
Technical scheme is as follows：
The experimental provision of concrete dynamic shear strength, including staving, clip and two are calculated using Hopkinson pressure bar
Disc-type baffle plate, the staving includes being provided with chute in two semicircle bucket walls, the semicircle bucket wall；The clip includes two
The individual thin folder of semicircle, the thin folder of semicircle is connected as one by screw bolt and nut, and the clip is used to clamp the staving；
The edge of the disc-type baffle plate is arranged with two auricles, and the auricle is positioned in the chute；The disc-type baffle plate
A middle side part be provided with chuck, two semicylinder concrete samples are placed between two disc-type baffle plates, and semicylinder is mixed
Solidifying soil test specimen is connected in the chuck.
Described utilization Hopkinson pressure bar calculates the experimental provision of concrete dynamic shear strength, wherein the clip number
Measure as three.
Described utilization Hopkinson pressure bar calculates the experimental provision of concrete dynamic shear strength, wherein the staving,
Clip and the material of disc-type baffle plate use Q345 steel, and credit rating is B grades or more than B grades.
Beneficial effects of the present invention are：
1st, Hopkinson pressure bar can carry out dynamic load to test specimen and high-strength load is loaded in short-term, but be mainly used in pressure
In contracting and diametral compression test, experimental provision of the invention expands the scope of application of Hopkinson pressure bar into shearing test, semicircle
Column body concrete sample type is similar to Hopkinson pressure bar standard specimen form, will not produce into additional effect, current Hope's gold
Gloomy depression bar uses universal, test principle maturation, it is ensured that the accuracy of experiment.The experimental provision of the present invention mixes semicylinder
Solidifying soil test specimen is arranged on Hopkinson pressure test device, and the experimental provision, which can fix semicylinder concrete sample, makes it
Dynamic pressurized process is carried out at the axial two ends of Hopkinson pressure bar and does not produce eccentric compression, so as to semicylinder concrete sample
Apply shearing force.
2nd, the disc-type baffle plate matched with semicylinder concrete sample is set in experimental provision of the invention, makes semicircle
Column body concrete test specimen Hopkinson pressure bar in punching course does not produce eccentric compression to test specimen under axial action, so as to enter
Mobile state pressurizes, and obtains accurate experimental data.
3rd, chute is set in semicircle bucket wall of the invention, the auricle of disc-type baffle plate is placed wherein and produce orientation
Slide so that dynamic pressurized is smoothed out.
4th, the present invention uses Q235 or Q345 steel, and credit rating is B grades or more than B grades, larger with higher intensity
Plastic deformation and absorption impact function, with enough deformabilities and good solderability.
Brief description of the drawings
Fig. 1 is the experimental provision front view that concrete dynamic shear strength is calculated using Hopkinson pressure bar；
Fig. 2 is Fig. 1 side view；
Fig. 3 is disc-type baffle plate front view；
Fig. 4 is Fig. 3 left view；
Fig. 5 is semicylinder concrete sample schematic diagram.
Embodiment
As Figure 1-5, the experimental provision of concrete dynamic shear strength, including staving are calculated using Hopkinson pressure bar
1st, three clips 2 and two disc-type baffle plates 3, the staving 1 include being provided with two semicircle bucket walls, the semicircle bucket wall
Chute；The clip 2 includes the thin folder of two semicircles, and the thin folder of semicircle is connected as one by screw bolt and nut, described
Clip 2 is used to clamp the staving 1；The edge of the disc-type baffle plate 3 is arranged with two auricles 4, and the auricle 4 is positioned over
In the chute；One middle side part of the disc-type baffle plate 3 is provided with chuck 5, and two semicylinder concrete samples 6 are placed on two
Between individual disc-type baffle plate 3, semicylinder concrete sample 6 is connected in the chuck 5；Wherein described staving 1, the and of clip 2
The material of disc-type baffle plate 3 uses Q345 steel, and credit rating is B grades or more than B grades.
It is enterprising in SHPB (Split Hopkinson Pressure Bar, Hopkinson press rods, abbreviation SHPB) device
Mobile state shear test, a diameter of 100mm of selection, highly the semicylinder concrete sample 6 for 50mm, by two semicylinders
Concrete sample 6 is placed between two disc-type baffle plates 3, and each semicylinder concrete sample 6 is connected in the chuck 5,
Two semicylinder concrete samples 6 fit together；Again by the incident bar and transmission bar of SHPB devices respectively with a disk
Shape baffle plate 3 is adjacent to, and applies impact load in the other end of incident bar afterwards, and the incidence recorded during impact experiment should
Become pulse, reflection strain-pulse, transmission strain-pulse, the dynamic shear strength that can obtain concrete is calculated according to the following formula：
In formula：τ is shearing strength (MPa), and E is that the modulus of elasticity (MPa) of Hopkinson pressure bar is Hopkinson pressure bar
Scalar quantity, A0For the rounded cross section area (mm of Hopkinson pressure bar2) can be obtained by survey calculation；εi(t) it is incident strain arteries and veins
Punching, εr(t) it is reflection strain-pulse, εt(t) it is transmission strain-pulse, three can be measured by Hopkinson pressure bar test；R
For the radius (mm) of semicylinder concrete sample 6, H is cut length (mm) for semicylinder concrete sample 6.
Claims (3)
1. the experimental provision of concrete dynamic shear strength is calculated using Hopkinson pressure bar, it is characterised in that including staving, folder
Son and two disc-type baffle plates, the staving include being provided with chute in two semicircle bucket walls, the semicircle bucket wall；The folder
Attached bag includes the thin folder of two semicircles, and the thin folder of semicircle is connected as one by screw bolt and nut, and the clip is used to clamp
The staving；The edge of the disc-type baffle plate is arranged with two auricles, and the auricle is positioned in the chute；The circle
One middle side part of dish baffle is provided with chuck, and two semicylinder concrete samples are placed between two disc-type baffle plates, and half
Cylinder concrete sample is connected in the chuck.
2. utilization Hopkinson pressure bar according to claim 1 calculates the experimental provision of concrete dynamic shear strength, its
It is characterised by, the clip quantity is three.
3. utilization Hopkinson pressure bar according to claim 1 calculates the experimental provision of concrete dynamic shear strength, its
It is characterised by, the material of the staving, clip and disc-type baffle plate uses Q345 steel, and credit rating is B grades or more than B grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710306840.4A CN106996895A (en) | 2017-05-04 | 2017-05-04 | The experimental provision of concrete dynamic shear strength is calculated using Hopkinson pressure bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710306840.4A CN106996895A (en) | 2017-05-04 | 2017-05-04 | The experimental provision of concrete dynamic shear strength is calculated using Hopkinson pressure bar |
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| CN106996895A true CN106996895A (en) | 2017-08-01 |
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| CN201710306840.4A Pending CN106996895A (en) | 2017-05-04 | 2017-05-04 | The experimental provision of concrete dynamic shear strength is calculated using Hopkinson pressure bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548735A (en) * | 2018-05-23 | 2018-09-18 | 东北大学 | A kind of Hopkinson pressure bar bullet electromagnetism retracting device |
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| CN203643279U (en) * | 2013-12-09 | 2014-06-11 | 北京有色金属研究总院 | Device for measuring dynamic shearing property of material |
| CN104048883A (en) * | 2014-03-03 | 2014-09-17 | 四川大学 | Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof |
| CN104198307A (en) * | 2014-09-03 | 2014-12-10 | 安徽理工大学 | Integrated dynamic one-way compression-shear stress-strain testing device |
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2017
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134750A (en) * | 2013-02-01 | 2013-06-05 | 河海大学 | Steel bar drawing testing device suitable for Hopkinson pressure bar |
| CN103278404A (en) * | 2013-05-20 | 2013-09-04 | 洛阳理工学院 | Testing device and method for simulating deep rock mass impact failure |
| CN103499486A (en) * | 2013-10-11 | 2014-01-08 | 河南科技大学 | Force applying ring clamping device for Hopkinson pressure bar |
| CN203643279U (en) * | 2013-12-09 | 2014-06-11 | 北京有色金属研究总院 | Device for measuring dynamic shearing property of material |
| CN104048883A (en) * | 2014-03-03 | 2014-09-17 | 四川大学 | Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof |
| CN104198307A (en) * | 2014-09-03 | 2014-12-10 | 安徽理工大学 | Integrated dynamic one-way compression-shear stress-strain testing device |
Non-Patent Citations (1)
| Title |
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| 崔云霄: "Hopkinson杆动态剪切实验技术综述", 《第四届全国爆炸力学实验技术学术会议》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548735A (en) * | 2018-05-23 | 2018-09-18 | 东北大学 | A kind of Hopkinson pressure bar bullet electromagnetism retracting device |
| CN108548735B (en) * | 2018-05-23 | 2024-04-16 | 东北大学 | Hopkinson pressure bar bullet electromagnetic recovery device |
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Application publication date: 20170801 |