CN111665146A - Testing arrangement of welding nail shear resistance bearing capacity under concrete fracture operating mode - Google Patents
Testing arrangement of welding nail shear resistance bearing capacity under concrete fracture operating mode Download PDFInfo
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- CN111665146A CN111665146A CN202010654245.1A CN202010654245A CN111665146A CN 111665146 A CN111665146 A CN 111665146A CN 202010654245 A CN202010654245 A CN 202010654245A CN 111665146 A CN111665146 A CN 111665146A
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- concrete
- test piece
- welding nail
- bearing capacity
- testing
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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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- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
Abstract
The invention discloses a device for testing the shear-resistant bearing capacity of a welding nail under a concrete cracking working condition, which comprises a self-balancing frame, test piece concrete, a steel member and a jack, wherein the steel member is connected to two side surfaces of the test piece concrete through the welding nail, two ends of the test piece concrete are connected with the jack, the test piece concrete is placed on a lower platform of the self-balancing frame, an upper platform of the self-balancing frame is in contact with the upper end surface of the steel member, and the self-balancing frame applies downward pressure to the upper platform through a hydraulic cylinder. The testing device for the shear resistance and bearing capacity of the welding nail under the concrete cracking working condition is characterized in that the shear resistance mechanical property measured by the testing method can reflect the stress characteristic of the welding nail connecting piece positioned in the concrete cracking area more truly, and the testing device is more in line with the actual engineering condition.
Description
Technical Field
The invention relates to the technical field of shear-resistant bearing capacity testing, in particular to a device for testing shear-resistant bearing capacity of a welding nail under a concrete cracking working condition.
Background
In a composite structure bridge, a steel structure and a concrete part need to be effectively combined by adopting connecting pieces to form a combined structure with cooperative stress, and the connecting pieces which are most used in the current engineering are welding nail connecting pieces. One end of the welding nail connecting piece is welded on a steel structure, the whole welding nail structure is wrapped in concrete, and the shearing-resistant bearing capacity of the welding nail connecting piece is adopted to design and calculate the structure. The shear-resistant bearing capacity of the welding nail is usually tested by adopting a push-out test, and the currently more general test method is that an I-shaped steel member is adopted to connect two pieces of concrete through the welding nail, thrust is applied to the steel member on a testing machine, so that the steel member and the concrete slide, and finally the welding nail is deduced, and the mechanical performance indexes of the welding nail, such as the shear-resistant bearing capacity, the shear-resistant rigidity and the like, are obtained.
The existing general weld nail connecting piece push-out test is carried out on the basis of the condition that concrete is intact, and the vicinity of a middle buttress of an actual combined beam bridge can bear the action of negative bending moment, so that the concrete is pulled to crack, therefore, the weld nail at the position actually works in the concrete cracking state, and the shearing resistance index measured by the traditional weld nail connecting piece push-out test cannot truly reflect the stress characteristic of the weld nail connecting piece positioned in the concrete cracking area.
Disclosure of Invention
The invention aims to provide a device for testing the shear-resistant bearing capacity of a welding nail under the working condition of concrete cracking, which is used for solving the problems in the prior art, so that the shear-resistant mechanical property measured by a welding nail push-out test is more in line with the actual engineering condition, and the accuracy of test data is improved.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a device for testing the shear-resistant bearing capacity of a welding nail under a concrete cracking working condition, which comprises a self-balancing frame, test piece concrete, a steel member, a jack and a controller, wherein two side surfaces of the test piece concrete are connected with the steel member through the welding nail, two ends of the test piece concrete are connected with the jack, the test piece concrete is placed on a lower platform of the self-balancing frame, an upper platform of the self-balancing frame is in contact with the upper end surface of the steel member, the self-balancing frame applies downward pressure to the upper platform through a hydraulic cylinder, and the hydraulic cylinder and the jack are respectively and electrically connected with the controller.
Preferably, the test piece concrete is I-shaped reinforced concrete, a displacement meter is arranged between the test piece concrete and the steel member, and the displacement meter is electrically connected with the controller.
Preferably, the jack is symmetrically arranged between the upper flange block body and the lower flange block body of the test piece concrete, the jack and the hydraulic cylinder are respectively provided with a pressure sensor, and the pressure sensors are electrically connected with the controller.
Preferably, two notches are symmetrically arranged on the web plate block body in the middle of the reinforced concrete.
Preferably, the welding nails and the notches are positioned on the same horizontal plane, and the notches and the jacks are arranged on the same side.
Preferably, the steel member is I-shaped steel, and the I-shaped steel is higher than the top surface of the concrete sample.
Compared with the prior art, the invention has the following technical effects:
the testing device for the shear resistance and bearing capacity of the welding nail under the concrete cracking working condition is characterized in that the shear resistance mechanical property measured by the testing method can reflect the stress characteristic of the welding nail connecting piece positioned in the concrete cracking area more truly, and the testing device is more in line with the actual engineering condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a device for testing shear-resistant bearing capacity of a weld nail under a concrete cracking condition according to the present invention;
FIG. 2 is a schematic structural view of a concrete sample according to the present invention;
FIG. 3 is a schematic structural view of a steel member according to the present invention;
FIG. 4 is a schematic view of an assembly structure of test piece concrete and a steel member in the invention;
wherein: 1-self-balancing frame, 2-upper platform, 3-hydraulic cylinder, 4-lower platform, 5-test piece concrete, 6-jack, 7-steel component, 8-welding nail, and 9-grooving.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a device for testing the shear-resistant bearing capacity of a welding nail under the working condition of concrete cracking, which is used for solving the problems in the prior art, so that the shear-resistant mechanical property measured by a welding nail push-out test is more in line with the actual engineering condition, and the accuracy of test data is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 4: this embodiment provides a testing arrangement of weld nail shear resistance capacity under concrete fracture operating mode, including self-balancing frame 1, test piece concrete 5, steel member 7, jack 6 and controller, connect steel member 7 through weld nail 8 on the both sides face of test piece concrete 5, the both ends and the jack 6 of test piece concrete 5 are connected, test piece concrete 5 places on self-balancing frame 1's lower platform 4, self-balancing frame 1's upper end 2 contacts with the up end of steel member 7, self-balancing frame 1 exerts pressure decurrent pressure to upper platform 2 through pneumatic cylinder 3, pneumatic cylinder 3 and jack 6 respectively with the controller electricity is connected. The self-balancing frame 1 of the present embodiment is a self-balancing frame with vertical loading as is conventional in the art.
The test piece concrete 5 is I-shaped reinforced concrete, so that the jack 6 can be conveniently arranged and the test piece concrete 5 can be conveniently cracked, a displacement meter is arranged between the test piece concrete 5 and the steel member 7 and is electrically connected with the controller, and the deformation quantity of the welding nails 8 can be conveniently monitored and recorded in real time. The jacks 6 are symmetrically arranged between the upper flange block body and the lower flange block body of the sample concrete 5, the jacks 6 and the hydraulic cylinder 3 are respectively provided with a pressure sensor, and the pressure sensors are electrically connected with the controller, so that the force application conditions of the jacks 6 and the hydraulic cylinder 3 can be monitored and recorded in real time. Two notches 9 (scribed lines) are symmetrically arranged on the web block body in the middle of the reinforced concrete, so that the crack of the reinforced concrete can be guided conveniently. The welding nail 8 and the notch 9 are positioned on the same horizontal plane, and the notch 9 and the jack 6 are arranged on the same side, so that the welding nail 8 is conveniently and guidingly positioned in a crack of the reinforced concrete. The steel member 7 is I-shaped steel which is higher than the top surface of the concrete 5 of the test piece.
The test method of the test device for the shear resistance of the weld nail under the concrete cracking working condition comprises the following steps:
step one, symmetrically arranging two notches 9 on a web plate block body in the middle of the test piece concrete 5 according to the height of a welding nail on a steel member, symmetrically connecting two I-shaped steel on the same horizontal plane of the notches 9 through the welding nail 8 to enable the upper surface of the I-shaped steel to be higher than the top surface of the test piece concrete 5, then placing the test piece concrete 5 on a lower platform 4 in a self-balancing frame 1 with vertical loading, and symmetrically placing jacks 6 between an upper flange block body and a lower flange block body of the test piece concrete 5.
And step two, the controller controls the jacks 6 to synchronously and symmetrically apply pressure to the test piece concrete 5, the jacks 6 are kept vertical until the web block of the test piece concrete 5 cracks along the positions of the notches 9, and the controller monitors and records the pressure value of the jacks 6 in real time through the pressure sensors arranged on the jacks 6. The application of force of the jack 6 is controlled according to the requirement of an experimental controller, so that the width of the crack seam at the notch 9 is adjusted to the experimental set width, and the jack 6 is locked and the application of force is kept unchanged.
And step three, adjusting the hydraulic cylinder 3 vertically loaded by the self-balancing frame 1, enabling the upper platform 2 connected with the hydraulic cylinder 3 to be pressed on the upper surface of the I-shaped steel, continuously applying pressure through the hydraulic cylinder 3 until the welding nail 8 is sheared, and monitoring and recording the pressure value of the hydraulic cylinder 3 in real time through a pressure sensor arranged on the hydraulic cylinder 3 and the deformation of the welding nail 8 in real time through a displacement meter by the controller.
The testing device for the shear resistance and bearing capacity of the welding nail under the concrete cracking working condition is characterized in that the shear resistance mechanical property measured by the testing method can reflect the stress characteristic of the welding nail 8 positioned in the concrete cracking area more truly, and the testing device is more in line with the actual engineering condition.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. The utility model provides a testing arrangement of anti shearing bearing capacity of welding nail under concrete fracture operating mode which characterized in that: including self-balancing frame, test piece concrete, steel member, jack and controller, connect through the weld nail on the both sides face of test piece concrete the steel member, the both ends of test piece concrete with the jack is connected, the test piece concrete place in on the lower platform of self-balancing frame, the upper mounting plate of self-balancing frame with the up end of steel member contacts, it is right that the self-balancing frame passes through the pneumatic cylinder the decurrent pressure is exerted pressure to the upper mounting plate, the pneumatic cylinder with the jack respectively with the controller electricity is connected.
2. The device for testing the shear-resistant bearing capacity of the welding nail under the working condition of concrete cracking according to claim 1, which is characterized in that: the test piece concrete is the reinforced concrete of I shape, the test piece concrete with be provided with the displacement meter between the steel member, the displacement meter with the controller electricity is connected.
3. The device for testing the shear-resistant bearing capacity of the welding nail under the working condition of concrete cracking according to claim 2, which is characterized in that: the jack is symmetrically arranged between the upper flange block body and the lower flange block body of the test piece concrete, the jack and the hydraulic cylinder are respectively provided with a pressure sensor, and the pressure sensors are electrically connected with the controller.
4. The device for testing the shear-resistant bearing capacity of the welding nail under the working condition of concrete cracking according to claim 2, which is characterized in that: two notches are symmetrically arranged on the web block body in the middle of the reinforced concrete.
5. The device for testing the shear-resistant bearing capacity of the welding nail under the working condition of concrete cracking according to claim 4, wherein: the welding nail and the notch are positioned on the same horizontal plane, and the notch and the jack are arranged on the same side.
6. The device for testing the shear-resistant bearing capacity of the welding nail under the working condition of concrete cracking according to claim 1, which is characterized in that: the steel member is I-shaped steel, the I-shaped steel is higher than the top surface of the concrete sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010654245.1A CN111665146A (en) | 2020-07-09 | 2020-07-09 | Testing arrangement of welding nail shear resistance bearing capacity under concrete fracture operating mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010654245.1A CN111665146A (en) | 2020-07-09 | 2020-07-09 | Testing arrangement of welding nail shear resistance bearing capacity under concrete fracture operating mode |
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| CN111665146A true CN111665146A (en) | 2020-09-15 |
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| CN202010654245.1A Pending CN111665146A (en) | 2020-07-09 | 2020-07-09 | Testing arrangement of welding nail shear resistance bearing capacity under concrete fracture operating mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088546A (en) * | 2022-01-12 | 2022-02-25 | 南通大自然温室大棚制造有限公司 | Shear-resistant bearing capacity detection device for stud for steel pipe and implementation method thereof |
-
2020
- 2020-07-09 CN CN202010654245.1A patent/CN111665146A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088546A (en) * | 2022-01-12 | 2022-02-25 | 南通大自然温室大棚制造有限公司 | Shear-resistant bearing capacity detection device for stud for steel pipe and implementation method thereof |
| CN114088546B (en) * | 2022-01-12 | 2022-04-01 | 南通大自然温室大棚制造有限公司 | Shear-resistant bearing capacity detection device for stud for steel pipe and implementation method thereof |
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