CN111595675B - Shear nail pulling resistance test loading device matched with pressure testing machine - Google Patents
Shear nail pulling resistance test loading device matched with pressure testing machine Download PDFInfo
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- CN111595675B CN111595675B CN202010446145.XA CN202010446145A CN111595675B CN 111595675 B CN111595675 B CN 111595675B CN 202010446145 A CN202010446145 A CN 202010446145A CN 111595675 B CN111595675 B CN 111595675B
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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
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention discloses a shear nail pulling resistance test loading device used in cooperation with a compression testing machine, which comprises a device body and a storage rack, wherein the device body is arranged in a hollow manner; the commodity shelf comprises n support legs, wherein n is more than or equal to 3, and the upper parts of the adjacent support legs are connected through the support columns to form an n-sided structure; the outer sides of the support legs of the storage rack are in sliding contact with the inner wall of the device body; the lower ends of the support legs of the shelf extend out of the hollow bottom surface of the device body; the concrete part is placed on the shelf, one end of the shear nail is embedded in the concrete, and the other end of the shear nail extends out of the bottom surface of the device body; an external thread is arranged at one end of the shear pin extending out of the bottom surface of the device body, and a high-strength bolt is arranged on the shear pin; a loading head of the pressure testing machine is in contact with the upper end of the device body and is used for loading pressure; the invention has simple structure, reasonable stress and clear force transmission, can meet the use of all shear nail static pull-out resistance tests, has convenient and quick loading and measuring processes, high measuring data precision and no need of calibration, and simultaneously meets the requirement of safety.
Description
Technical Field
The invention relates to bridge engineering, in particular to a shear nail pulling resistance test loading device matched with a pressure testing machine.
Background
The steel-concrete combined structure is a structural form developed on the basis of a concrete structure and a steel structure, and the reinforced concrete member and the steel member are combined through a connecting piece, so that the concrete and steel work cooperatively and jointly bear force, and the respective material advantages are exerted. The combined structure has the advantages of light dead weight, reduced earthquake response, capability of relieving the cracking problem of concrete through reasonable stress, capability of greatly simplifying the construction process and shortening the construction period by taking part of steel members as templates of the concrete, capability of reducing the steel consumption, higher rigidity and better stability. Therefore, the steel-concrete composite structure has been rapidly developed in recent years and is widely applied to practical engineering, particularly large-span structures and high-rise structures.
The premise that the advantages of the steel-concrete composite structure are exerted is that two materials can be effectively and reliably combined, the two materials depend on a shear connecting piece to a great extent, and the functions of the shear connecting piece in the composite structure are mainly represented as follows: transferring shear forces at the interface of the steel member and the concrete member, resisting slippage therebetween, and preventing lifting, i.e., separation of the two material layers. The two points ensure that the steel and the concrete are stressed and deform coordinately, so that the shearing resistance and the pulling resistance of the shear connector are the core problems of researching the combined structure. At present, the main method for researching the pulling resistance of the quasi-static shear nail is a quasi-static shear nail pulling resistance test, and the adopted loading devices generally comprise two types: one is a reaction frame device using a center-piercing jack as shown in fig. 10, and the other is a device using a jig to pull a shear pin as shown in fig. 11.
As shown in fig. 10, in the device, shear nails are embedded in mass concrete, a perforated reaction frame is placed on the concrete, and a piercing jack and a force sensor are placed on the reaction frame; the shear nails are welded on the I-shaped steel beams, the I-shaped steel beams are connected with the loading rods and penetrate through the reaction frame, the jack and the force sensor, and the tops of the I-shaped steel beams are fixed by high-strength nuts. The device moves the loading rod upwards through the piercing jack to generate a drawing effect, the drawing effect of the shear nail is achieved, but the device is huge in whole and wastes materials. And the reaction frame and the I-shaped steel beam need to be checked and specially made, so that the universal convenience is not provided, and most importantly, the loading mode is easy to generate unbalance loading.
As shown in FIG. 11, the device adopts a clamp type, the shear nail pulling-resistant test piece is placed in a steel sleeve, a through hole is formed in a bottom plate of the steel sleeve for the penetration of a shear nail, the upper end of the steel sleeve is fixed on an upper base, the penetrated shear nail is clamped by a hydraulic clamp, and the clamp is fixed on a lower base. The device applies pulling force by downward movement of the hydraulic clamp, but the lower surface of the concrete is in contact with the sleeve and cannot be used for researching cone damage of the shear nail. In addition, the shear force nail is easily surrendered the destruction before other positions of nail body by the hydraulic fixture chuck centre gripping cross-section.
Disclosure of Invention
The shear pin pulling-resistant test loading device used in cooperation with the pressure testing machine, provided by the invention, has the advantages that the test loading is more convenient and faster, the data acquisition is more accurate and convenient, and the universality of the test device is improved.
A shear nail pulling-resistant test loading device matched with a pressure testing machine comprises a device body and a storage rack, wherein the device body is arranged in a hollow mode, and the storage rack is arranged in the device body; the commodity shelf comprises n support legs, wherein n is more than or equal to 3, and the upper parts of the adjacent support legs are connected through the support columns to form an n-sided structure; the outer sides of the support legs of the commodity shelf are in sliding contact with the inner wall of the device body; the lower ends of the support legs of the shelf extend out of the hollow bottom surface of the device body; the concrete part is placed on the shelf, the head end of the shear nail is embedded in the concrete, and the other end of the shear nail extends out of the bottom surface of the device body; an external thread is arranged at one end of the shear pin extending out of the bottom surface of the device body, and a high-strength bolt is arranged on the shear pin; the loading head of the pressure tester is contacted with the upper end of the device body for loading pressure.
Further, the outside of the supporting leg of the storage rack is provided with a pulley, and the inner wall of the device body is provided with a groove at a corresponding position.
Furthermore, m stiffening devices are arranged on the outer side of the device body, and each stiffening device comprises a first vertical plate and a second vertical plate, wherein the first vertical plate is arranged along the outer surface of the device body, and the second vertical plate is parallel to the first vertical plate; still include one end and the first riser be connected the diaphragm that the other end is connected with the second riser.
Furthermore, a force bearing device is arranged at the upper end of the device body, and the loading head applies pressure to the device body through the force bearing device.
Furthermore, the lower end of the force bearing device is clamped with the upper end of the stiffening device.
Furthermore, the force bearing device is of a cross structure.
Furthermore, the bottom surface of the device body is a cross-shaped structural support piece, and a through hole for the shear nail to pass through is formed in the support piece.
Furthermore, a gasket is arranged between the high-strength bolt and the bottom surface of the device body.
The invention has the beneficial effects that:
(1) The invention changes the force transmission direction, realizes the effect of pulling out the shear nail by using pressure load, and is matched with a pressure testing machine to ensure that the shear nail pulling-out test is more convenient to load;
(2) The stiffening device is arranged outside the device body, the rigidity is greatly improved, the device is not easy to deform, the displacement of the loading head of the pressure testing machine can be used as the displacement for pulling out the shear nail, the accuracy of data is convenient to ensure, the loading and recording processes are simplified, and the risk of splashing of concrete can be avoided when the device is damaged;
(3) The pulley is arranged outside the storage rack, so that the device body and the storage rack can be prevented from being collided and clamped, the contact and the friction between the device body and the storage rack can be reduced, the sliding chute matched with the inner wall of the steel sleeve can be effectively limited, the eccentric loading of a test piece is avoided, meanwhile, a large enough space is reserved for the concrete bottom surface of the test piece, and the possibility of damaging a concrete cone is not influenced;
(4) The force bearing device can uniformly transmit pressure load to the device body;
(5) The invention has simple structure, reasonable stress and clear force transmission, can meet the use of all shear nail quasi-static pull-out resistance tests, has convenient and quick loading and measuring processes, high measuring data precision and no need of calibration, and simultaneously meets the requirement of safety.
Drawings
FIG. 1 is a perspective cross-sectional view of the device of the present invention.
FIG. 2 is a schematic view of the device body structure of the present invention.
FIG. 3 is a top view of the device body of the present invention.
Fig. 4 is a schematic view of the shelf structure of the present invention.
FIG. 5 is a diagram of the position relationship between the device body and the shelf.
FIG. 6 is a diagram showing the positional relationship between the rack and the concrete sample.
FIG. 7 is a schematic view of a shear pin fixing structure of the device of the present invention.
Fig. 8 is a structural schematic diagram of the force bearing device of the device.
FIG. 9 is a schematic view of the placement of the device of the present invention in a compression tester.
FIG. 10 is a schematic view of a pull-out resistance test device for a reaction frame type shear nail.
FIG. 11 is a schematic view of a hydraulic clamp type shear nail pull-out resistance test device.
In the figure: the concrete-reinforced concrete-filled steel pipe pile comprises a 1-force bearing device, a 2-loading head, a 3-device body, a 3 a-stiffening device, a 3 b-supporting piece, a 3 c-groove, a 4-storage rack, a 4 a-pulley, a 5-high-strength bolt and 6-concrete.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1 to 9, a shear pin pulling resistance test loading device used in cooperation with a compression testing machine comprises a device body 3 arranged in a hollow manner and a storage rack 4 arranged in the device body; the commodity shelf 4 comprises n support legs, wherein n is more than or equal to 3, and the upper parts of the adjacent support legs are connected through the support columns to form an n-edge structure; the outer side of the supporting leg of the shelf 4 is in sliding contact with the inner wall of the device body 3; the lower ends of the supporting legs of the shelf 4 extend out of the hollow bottom surface of the device body 3; the concrete 6 is partially placed on the shelf 4, one end of the shear nail is embedded in the concrete 6, and the other end of the shear nail extends out of the bottom surface of the device body 3; one end of the shear nail extending out of the bottom surface of the device body 3 is provided with an external thread and a high-strength bolt 5; the loading head 2 of the compression testing machine is contacted with the upper end of the device body 1 for loading pressure.
The outer side of the device body 3 is provided with m stiffening devices 3a, and each stiffening device comprises a first vertical plate and a second vertical plate, wherein the first vertical plate is arranged along the outer surface of the device body 3, and the second vertical plate is parallel to the first vertical plate; still include that one end is connected the diaphragm that the other end is connected with the second riser with the starting stave. In the embodiment, the device body 3 is made of a steel sleeve, the stiffening device 3a is made of profile steel, and the stiffening device 3a is used for preventing local yielding in the loading of the steel sleeve; the bottom surface of the device body 3 is a cross-shaped structural support member 3b, and the support member 3b is provided with a through hole for a shear nail to pass through. Support piece 3b adopts the preparation of shaped steel frame, and its rigidity is big, has avoided the result that the displacement data is big to the side of pulling out that the deformation leads to, and does not hinder supporter 4 and place the space.
The outer sides of the supporting legs of the commodity shelf 4 are provided with pulleys 4a, and the inner wall of the device body 3 is provided with a groove 3c at a corresponding position. In this embodiment, the rack 4 is formed by connecting 4 support legs through square steel columns, a concrete 6 specimen is placed on the rack 4 to provide vertical support, and two fixed pulleys 4a are arranged on the outer side of each support leg of the rack 4. The commodity shelf 4 sets up in the steel sleeve, and steel sleeve inner wall recess 3c is 4 outer wall pulleys 4 a's of commodity shelf guide slot. The vertical displacement of the steel sleeve can be ensured to prevent unbalance loading, and the sliding friction between the steel sleeve and the steel sleeve can be eliminated, so that the load is completely acted on the shear nail.
The upper end of the device body 3 is provided with a force bearing device 1, and the loading head 2 applies pressure to the device body 3 through the force bearing device 1. The lower end of the force bearing device 1 is clamped with the upper end of the stiffening device 3 a; the force bearing device 1 is of a cross structure; the force-bearing device 1 is arranged at the top of the device body 3, the force-bearing device 1 adopts a steel clamp to clamp a stiffening device 3a, namely profile steel, on the outer wall of the device body 3, so that the force-bearing device and the profile steel are prevented from sliding and falling off, and finally the loading device is integrally arranged between loading heads of the compression testing machine for loading, as shown in figure 9.
A gasket is arranged between the high-strength bolt 5 and the bottom surface of the device body 3; a concrete 6 test piece is placed on the storage rack 4, the head end of the shear nail is embedded in the concrete 6, the other end of the shear nail penetrates through a circular through hole in the support piece 3b at the lower end of the device body 3, a thread is turned on a protruding part line, the high-strength bolt 5 is used for fixing and limiting, and a gasket made of steel can be added between the high-strength bolt 5 and the support piece 3b to avoid stress concentration.
The invention changes the force transmission direction, realizes the effect of pulling out the shear nail by using pressure load, and leads the pulling-out test of the shear nail to be more convenient for loading by matching with a pressure testing machine; the steel sleeve is reinforced by the section steel, so that the rigidity of the steel sleeve is greatly improved, the steel sleeve is not easy to deform, the displacement of a loading head of the pressure testing machine can be used as the displacement for pulling out the shear nail, the accuracy of data is convenient to ensure, the loading and recording processes are simplified, and the risk of splashing of concrete can be avoided when the concrete is damaged; the pulley on the outer wall of the storage rack can prevent the section steel sleeve from being collided and clamped with the storage rack, so that the contact and the friction between the section steel sleeve and the storage rack are reduced, the sliding chute matched with the inner wall of the steel sleeve can be effectively limited, the eccentric loading of a test piece is avoided, and meanwhile, a large enough space is reserved for the concrete bottom surface of the test piece, so that the possibility of damaging a concrete cone is not influenced; the top loaded steel frame can uniformly transmit the pressure load to the steel sleeve; the test piece size is less, and the template is easily made and material saving during the preparation. The invention has simple structure, reasonable stress and clear force transmission, can meet the use of all shear nail quasi-static pull-out resistance tests, has convenient and quick loading and measuring processes, high measuring data precision and no need of calibration, and simultaneously meets the requirement of safety.
Claims (5)
1. A shear nail pulling-resistant test loading device used in cooperation with a compression testing machine is characterized by comprising a device body (3) which is hollow inside and a storage rack (4) which is arranged inside the device body; the commodity shelf (4) comprises n support legs, wherein n is more than or equal to 3, and the upper parts of the adjacent support legs are connected through the support columns to form an n-edge structure; the outer side of the supporting leg of the commodity shelf (4) is in sliding contact with the inner wall of the device body (3); the lower ends of the supporting legs of the commodity shelf (4) extend out of the hollow bottom surface of the device body (3); the concrete (6) is partially placed on the shelf (4), the head end of the shear nail is embedded in the concrete (6), and the other end of the shear nail extends out of the bottom surface of the device body (3); an external thread is arranged at one end of the shear pin extending out of the bottom surface of the device body (3), and a high-strength bolt (5) is arranged; a loading head (2) of the pressure testing machine is contacted with a force bearing device (1) at the upper end of a device body (3) for loading pressure; pulleys (4 a) are arranged on the outer sides of the supporting legs of the article placing rack (4), and grooves (3 c) are formed in the corresponding positions of the inner wall of the device body (3);
m stiffening devices (3 a) are arranged on the outer side of the device body (3), and each stiffening device comprises a first vertical plate and a second vertical plate, wherein the first vertical plate is arranged along the outer surface of the device body (3), and the second vertical plate is parallel to the first vertical plate; still include one end and the first riser be connected the diaphragm that the other end is connected with the second riser.
2. The shear nail pulling-resistant test loading device used in cooperation with the compression testing machine as claimed in claim 1, wherein the lower end of the force bearing device (1) is clamped with the upper end of the stiffening device (3 a).
3. The shear nail pull-out resistance test loading device matched with the compression testing machine for use according to claim 2, wherein the force bearing device (1) is of a cross-shaped structure.
4. The shear nail pull-out resistance test loading device matched with the compression testing machine for use according to claim 1, wherein the bottom surface of the device body (3) is a cross-shaped structural support member (3 b), and a through hole for a shear nail to pass through is formed in the support member (3 b).
5. The shear nail pulling resistance test loading device matched with the compression testing machine for use according to claim 1, wherein a gasket is arranged between the high-strength bolt (5) and the bottom surface of the device body (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010446145.XA CN111595675B (en) | 2020-05-25 | 2020-05-25 | Shear nail pulling resistance test loading device matched with pressure testing machine |
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| CN202010446145.XA CN111595675B (en) | 2020-05-25 | 2020-05-25 | Shear nail pulling resistance test loading device matched with pressure testing machine |
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| CN111595675B true CN111595675B (en) | 2022-10-21 |
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| JP5718687B2 (en) * | 2010-03-16 | 2015-05-13 | Ntn株式会社 | Method and system for estimating fatigue limit surface pressure of rolling contact metal materials |
| CN103134750A (en) * | 2013-02-01 | 2013-06-05 | 河海大学 | Steel bar drawing testing device suitable for Hopkinson pressure bar |
| CN204255832U (en) * | 2014-12-23 | 2015-04-08 | 重庆交通大学 | Crab-bolt pullout tests charger |
| CN105300718B (en) * | 2015-11-09 | 2018-01-26 | 山东科技大学 | Anchor structure pull-out test device and test method |
| CN109060649A (en) * | 2018-04-08 | 2018-12-21 | 上海市政工程设计研究总院（集团）有限公司 | Test the experimental rig and method of major diameter double limb reinforcing bars and Concrete Bond Strength |
| CN208937434U (en) * | 2018-10-31 | 2019-06-04 | 华北理工大学 | Peg tensile shear testing device |
| CN110426344A (en) * | 2019-08-26 | 2019-11-08 | 河海大学 | A kind of self-balancing type reinforcing bar and concrete binding sliding test device and test method |
| CN110702602B (en) * | 2019-10-29 | 2022-05-13 | 广西大学 | Device and method for testing cohesiveness of reinforced concrete under bending-shearing action |
| CN110779800A (en) * | 2019-11-27 | 2020-02-11 | 中南大学 | Method and device for predicting pullout resistance of compacted grouting soil nail and device application method |
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| Title |
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| 装配式组合梁剪力钉抗剪承载力研究;李成君等;《中国公路学报》;20170315(第03期);264-270 * |
| 钢框架-装配式混凝土抗侧力墙板结构受力性能;吴函恒等;《东南大学学报(自然科学版)》;20160120(第01期);118-125 * |
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