CN210128008U - Bolt shear connector with weakened section - Google Patents
Bolt shear connector with weakened section Download PDFInfo
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- CN210128008U CN210128008U CN201920186170.1U CN201920186170U CN210128008U CN 210128008 U CN210128008 U CN 210128008U CN 201920186170 U CN201920186170 U CN 201920186170U CN 210128008 U CN210128008 U CN 210128008U
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- screw rod
- necking
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Abstract
The utility model discloses a bolt shear force connecting piece of type is cut down in cross-section, including nut, screw rod, screw thread, nut, gasket, plastics screw rod sleeve, the screw rod is equipped with the nut, need process out one section cross-sectional area in the smooth pole section of screw rod between girder steel edge of a wing upside screw thread top and the nut and reduce the necking down pole section of the symmetry of crescent again gradually. When the screw rod is applied to the composite beam as a shear connector, the necking rod section is close to the position of the nut on the upper flange of the steel beam, the screw rod penetrates through a preset hole on the flange of the steel beam and is fastened on the flange of the steel beam through an upper nut and a lower nut, and a gasket is arranged between the lower surface of the flange of the steel beam and the lower nut. The utility model ensures the reliable shearing strength of the joint surface of the steel beam and the concrete slab, reduces the rigidity of the necking rod section, increases the deformability of the bolt shear connector and avoids the brittle fracture; the induced damage position shifts to the necking down pole section, avoids the girder steel and the bolt of screw rod section to produce the deformation that is unfavorable for later stage to dismantle.
Description
Technical Field
The utility model relates to a steel-concrete composite beam especially relates to a shear force connecting piece of steel and concrete joint face in composite beam, belongs to the building engineering field.
Background
The steel-concrete combined beam can fully exert the advantages of good tensile property of steel and high compressive strength of concrete, thereby having excellent mechanical property and higher economical efficiency. In a steel-concrete composite beam, a steel beam and a concrete slab combine the two materials together to bear force through a shear connector, which is a key component in the composite beam. Currently, the engineering community typically employs welded studs as shear connectors in composite beams. The shear key for the welding stud has the advantages of simple structure and same shearing resistance in all directions, but has the problems of troublesome construction, need of equipment such as a welding gun and the like, difficulty in ensuring the welding quality during field welding and the like.
In recent years, with national advocates and promotion of engineering structure assembly, bolted shear connectors have replaced welded studs as shear connectors in some composite beam members. The bolt shear connector consists of a nut, a screw rod, threads, nuts and a gasket, wherein the screw rod penetrates through a hole preset in the flange of the steel beam, the upper nut and the lower nut are fastened on the flange of the steel beam, and the gasket is arranged between the lower surface of the flange of the steel beam and the nuts. Compare in welding stud shear force connecting piece and use nut connection pin pole and girder steel, construction convenient operation, connection quality is stable. Compared with a welding mode, the installation of the bolt connection can save more manpower, material resources and construction time, and reduce the cost related to welding. Meanwhile, the combination beam has the characteristic of being detachable due to the fact that the bolts are connected and matched with the precast concrete plates, and later-stage maintenance and recycling are facilitated.
Chinese patent CN203755452U discloses a "bolted shear connector", which is based on a traditional bolted shear connector, wherein a spring is arranged around a screw, and the bottom of a nut at the top end of the screw is welded with the top of an upper flange of a steel beam and the end of the spring.
Chinese patent CN202227584U discloses a "non-welded high-strength bolt shear key structure", which is a structural principle that the steel beam flanges are transversely changed from two rows of traditional bolts to four rows of bolts, and the four rows of bolts are symmetrically arranged.
Chinese patent CN205329851U discloses a "novel bolt sleeve shear connector", which has a structure principle that a straight thread sleeve is arranged at the thread part on the upper side of the upper flange of a steel beam and is welded with the flange of the steel beam, and this technique needs to purchase a steel sleeve and still needs to be welded, which has a high cost and an excessive rigidity, resulting in poor deformability.
In summary, when the bolted shear connector is used as a shear connector of a detachable assembled composite beam, the following problems exist: (1) the screw is usually made of high-strength steel, the high-strength steel has higher strength than common steel used in the traditional welding stud, but the high-strength steel is brittle in material, low in ductility and low in elongation, so that the deformation capability of the bolt serving as a shear connecting piece is low, and the internal force redistribution of a steel beam and a concrete slab in the composite beam and the integral deformation capability of the composite beam are influenced; (2) in the failure mode of a bolted shear connection where the bolt shears, the shear plane of the bolt is generally at the interface of the slab floor and the top of the flange of the steel beam, where the bolt annulus is threaded. (3) Shear failure occurs in the bolt thread section, the section of the screw is too large in deformation or too large in deformation caused by local pressure-bearing failure of the flange screw hole of the steel beam, the construction difficulty of later-stage disassembly work can be increased, and recycling of components is not facilitated. (4) The traditional high-strength bolt shear connector is externally connected with a part capable of increasing the cross section area, the rigidity and the strength of the traditional high-strength bolt shear connector can be improved, the deformation capacity of the traditional high-strength bolt shear connector is reduced, the traditional high-strength bolt shear connector is easy to brittle fracture, part of the externally connected part still needs to be welded, and the cost of the externally connected part are both greatly.
Disclosure of Invention
The utility model aims to overcome prior art's shortcoming, provide the bolt shear connector of the type that weakens in cross-section that has better ductility and deformability, convenient to detach for steel-concrete composite beam.
The utility model discloses a bolt shear force connecting piece of bolt weakening type, have the bolt of nut including the top, the bolt include from last smooth rod section, necking down rod section, smooth rod section and the screw rod section down that links to each other in proper order and set up down, glazing slide rod section diameter, smooth rod section diameter and screw rod section's external diameter are unanimous down, the minimum cross section diameter of necking down rod section is less than the internal diameter of screw rod section the lower part threaded connection of screw rod section have lower nut and gasket the upper portion threaded connection of screw rod section have the nut, necking down rod section on the cover have a plastics screw rod sleeve, plastics screw rod sleeve wall thickness be 2-3 mm.
The utility model discloses have following advantage and outstanding effect for prior art:
1. compare with traditional bolt shear force connecting piece, the utility model discloses a reduce the cross sectional area to the local pole section of bolt shear force connecting piece's screw rod to weaken the rigidity and the ability of shearing of this pole section, improve bolted connection's ductility and deformability, overcome the easy brittle fracture of traditional high strength bolt, ductility and the poor shortcoming of deformability.
2. The traditional bolt shear connecting piece is mostly in the form of shear damage of a contact surface of a concrete slab and a steel beam flange or local bearing damage of the steel beam flange, and the damage mode can cause overlarge deformation of a screw rod of the two nut clamping parts or the steel beam flange and is not easy to disassemble. The utility model discloses in weaken the smooth pole section of screw concrete side part, make it take place to destroy in advance of concrete slab and girder steel edge of a wing contact surface position, should destroy the mode and make nut clamping part screw rod intact, the later stage of being convenient for is dismantled to the core shear position that compares traditional bolt shear connector destroys and loses the connection and function of shearing, the utility model discloses still have better connection and function of shearing after destroying.
3. Compare in general welding form, bolt shear force connecting piece's use can use manpower and materials, engineering time and the cost of welding of executing, is to use more and more extensive shear force connecting piece among the steel-concrete integrated configuration especially assembled integrated configuration at present, the utility model discloses carry out the performance improvement on this basis, make its shear force connecting piece's deformability improve, carry out intentional induction to the potential destruction position of shear force connecting piece and destruction mode simultaneously, avoided unfavorable destruction mode and bolt to cut the harmful effect that the position brought.
4. Compared with other bolt shear connectors with additional auxiliary parts, the utility model discloses only need to process into the recess with former bolt shear connector's screw rod and carry out the cross-section weaken can, through the cross-sectional area of weakening the cross-section in the adjusting screw, weaken the position of cross-section and former cross-section to the transition form of weakening the cross-section, can adjust bolt shear connector's rigidity, anti shear capacity and deformability obtain the diversified shear connector of rigidity, optimize the arrangement scheme of connecting piece in the composite beam.
Drawings
FIG. 1 is a schematic view of a cross-sectional weakened bolt of the present invention;
FIG. 2 is a schematic structural view of a bolt shear connector of the present invention with a weakened cross section;
FIG. 3 is a schematic diagram of the characteristic dimension of the bolt shear connector with a weakened cross section according to the present invention;
fig. 4 is an application schematic diagram of the bolt shear connector with a weakened cross section according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, a bolt shear connector of bolt weakening type comprises a bolt with a nut 1 at the top, wherein the bolt comprises an upper smooth rod section 2, a necking rod section 3, a lower smooth rod section and a threaded rod section 4 which are sequentially connected from top to bottom, and the diameters of the upper smooth rod section 2 and the lower smooth rod section are consistent with the outer diameter of the threaded rod section 4. The minimum cross section diameter of the necking rod section 3 is smaller than the inner diameter of the threaded rod section 4, the lower portion of the threaded rod section is in threaded connection with a lower nut 5-1 and a gasket 6, the upper portion of the threaded rod section is in threaded connection with an upper nut 5-2, and the necking rod section 3 is sleeved with a plastic screw sleeve 7. The plastic screw sleeve 7 should have a wall thickness of 2-3mm to enhance rigidity and strength, and prevent the deformation of the necking rod section 3 under the pressure of high-strength mortar, which brings about the adverse effect of enhancing the rigidity of the weakening section.
The threaded rod section 4 is used for penetrating through a preset opening of the upper flange of the steel beam 11, the gasket 6 is fixed on the bottom wall of the upper flange of the steel beam 11 through screwing the lower nut 5-1, and the upper nut 5-2 is fixed on the top wall of the upper flange of the steel beam 11 through screwing. The bolt part at the upper part of the upper flange is used for being arranged in a prepared hole 9 of a precast concrete plate 10, and the precast concrete plate 10 is used for being arranged at the upper side of the upper flange of a steel beam 11.
The necking rod section 3 is machined through machining of a factory, the necking rod section 3 is arranged close to an upper nut 5-2 at the upper flange of a steel beam, a plastic screw sleeve 7 is sleeved on a smooth rod section of the screw 2 in advance, then the upper nut 5-2 on the flange of the steel beam is screwed, and then the threaded rod section 4 penetrates through a preset opening on the flange of the steel beam and is fastened on the flange 8 of the steel beam through nuts on two sides of the opening.
Preferably, the bolt is a high-strength bolt of 8.8 grade or above.
Preferably, the necking rod section 3 adopts any necking structure with a cross-section weakening effect, wherein the outer profile of the necking rod section is an arc concave surface, a semicircular concave surface, a triangular concave surface and the like. The function of the neck section 3 is to induce a transition of the failure site towards the neck section 3 and to enhance the deformability of the bolt.
Preferably, the diameter D of said upper smooth rod segment 2 should be equal to or greater than 16 mm. After the necking treatment is carried out on the bolt, the screw still has ultimate tensile bearing capacity and ultimate shear-resistant bearing capacity which meet the bearing requirements of the bolt.
The preferred minimum cross-sectional diameter D of the neck section 3 is D/2. By adopting the size, the damage position can be induced to be transferred to the necking rod section 3, the deformation capacity of the bolt can be enhanced, and the ultimate tensile bearing capacity and the ultimate shear bearing capacity required by the bearing of the bolt can be realized.
Preferably, the height L of the neck section 3 is D/2. By adopting the size, the damage position can be induced to be transferred to the necking rod section 3, the deformation capacity of the bolt can be enhanced, and the ultimate tensile bearing capacity and the ultimate shear bearing capacity required by the bearing of the bolt can be realized.
Preferably the top of the neck section 3 is spaced from the lower surface H of the nut 1 by a distance (4D-L). This dimension is effective to join the concrete slab 10 and steel beam 11 together and prevent the bolts from becoming detached from the concrete slab.
Preferably, the distance h from the minimum cross-sectional position of the neck section 3 to the upper surface of the flange 8 of the steel beam is (L/2+ the height of the upper nut 5-2). The use of this dimension can induce the transition of the failure site to the neck section 3 and enhance the bolt deformability.
The preferred forms of necking formation are each formed as a concave formation of progressively decreasing and then progressively increasing cross-sectional area from the top to the bottom of the neck section 3. The processing technology is simple and easy to realize, and the damage position can be induced to be transferred to the necking rod section 3 and the deformation capacity of the bolt can be enhanced.
When the outer contour of the necking rod section 3 adopts an arc concave surface form, the curvature radius R of the arc is
By adopting the curvature radius, the damage position can be induced to be transferred to the necking rod section 3, the deformation capacity of the bolt can be enhanced, and the ultimate tensile bearing capacity and the ultimate shear bearing capacity required by the bearing of the bolt can be realized.
The diameter of the smallest cross section of the neck section is D, D preferably being half the diameter D/2 of the glazing rod section 2, the height of the neck section is L, L preferably being half the diameter D/2 of the smooth rod section 2. By adopting the size, the damage position can be induced to be transferred to the necking rod section 3, the deformation capacity of the bolt can be enhanced, and the ultimate tensile bearing capacity and the ultimate shear bearing capacity required by the bearing of the bolt can be realized.
The weakening pattern of the screw neck segments 3 is not limited to arcuate, circular and triangular, and any treatment that locally weakens the screw portion of the bolted shear connection is within the scope of the claims.
The utility model discloses cross-section weakening type bolt shear connector finishes with girder steel 11 is connected the back, will have precast concrete board 10 of preformed hole 9 to install at girder steel 11 upper limb upside, arranges the bolt in concrete preformed hole 9 simultaneously, adjusts the back well in concrete board 10 and girder steel 11 position, and it flushes with concrete board 10 upper surface to fill preformed hole 9 with the mortar that excels in.
The above description of the present invention is provided to facilitate understanding and application of the present invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications can be easily made to the present invention and applied to other embodiments without having to go through the inventive work. Therefore, the present invention is not limited to the embodiments herein, and those skilled in the art should understand that modifications and alterations made without departing from the scope of the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a bolt shear force connecting piece of type is weakened in cross section, includes the bolt that the top has the nut, its characterized in that: the bolt include from last smooth rod section, neck down rod section, smooth rod section and the screw rod section down that links to each other in proper order and set up down, glazing slide rod section diameter, smooth rod section diameter and screw rod section's external diameter down are unanimous, the minimum cross section diameter of neck down rod section is less than the internal diameter of screw rod section the lower part threaded connection of screw rod section have lower nut and gasket the upper portion threaded connection of screw rod section have last nut neck down rod section on the cover have a plastics screw rod sleeve, plastics screw rod sleeve wall thickness is 2-3 mm.
2. A shear connector for a bolt of the type having a weakened section according to claim 1, wherein: the cross-sectional area of the neck section is a concave structure which gradually decreases and then gradually increases from the top to the bottom of the neck section.
3. A shear connector for a bolt of the type having a weakened section according to claim 2, wherein: the necking rod section adopts a necking structure with an arc-shaped concave surface, a semicircular concave surface or a triangular concave surface as an outer contour.
4. A shear connector for a bolt of the type having a weakened section according to claim 3, wherein: when the outer contour of the necking rod section adopts an arc concave surface form, the curvature radius R of the arc is
D is the diameter of the glazing slide bar section, D is the minimum cross section diameter of the necking bar section, and L is the height of the necking bar section.
5. A shear connector for a bolt of the type having a weakened section according to claim 3, wherein: the height of the necking rod section is half of the diameter of the glazing slide rod section.
6. A shear connector for bolts of reduced cross-section according to any one of claims 1 to 5, wherein: the bolts are high-strength bolts of 8.8 grades and above.
7. A shear connector for bolts of reduced cross-section according to any one of claims 1 to 5, wherein: the diameter D of the glazing slide bar section is larger than or equal to 16 mm.
8. A bolt shear connector of the weakened cross-section type according to claim 4, wherein: the minimum cross-sectional diameter D of the neck section is D/2.
9. A bolt shear connector of the weakened cross-section type according to claim 4, wherein: the height L of the necking rod section is D/2.
10. A bolt shear connector of the weakened cross-section type according to claim 4, wherein: the distance H from the top starting point of the necking rod section to the lower surface H of the screw cap is 4D-L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920186170.1U CN210128008U (en) | 2019-02-02 | 2019-02-02 | Bolt shear connector with weakened section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920186170.1U CN210128008U (en) | 2019-02-02 | 2019-02-02 | Bolt shear connector with weakened section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210128008U true CN210128008U (en) | 2020-03-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920186170.1U Expired - Fee Related CN210128008U (en) | 2019-02-02 | 2019-02-02 | Bolt shear connector with weakened section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210128008U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826860A (en) * | 2019-02-02 | 2019-05-31 | 天津大学 | A kind of stud shear connector of section weakening type |
-
2019
- 2019-02-02 CN CN201920186170.1U patent/CN210128008U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826860A (en) * | 2019-02-02 | 2019-05-31 | 天津大学 | A kind of stud shear connector of section weakening type |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200306 Termination date: 20210202 |