CN212611920U - Novel trapezoidal trompil PBL shear force key of connecting reinforcing bar and concrete - Google Patents
Novel trapezoidal trompil PBL shear force key of connecting reinforcing bar and concrete Download PDFInfo
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- CN212611920U CN212611920U CN202022953767.XU CN202022953767U CN212611920U CN 212611920 U CN212611920 U CN 212611920U CN 202022953767 U CN202022953767 U CN 202022953767U CN 212611920 U CN212611920 U CN 212611920U
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Abstract
The utility model discloses a novel trapezoidal trompil PBL shear force key of connecting reinforcing bar and concrete, including the I-shaped steel beam, the trompil floor that the web of two parallel I-shaped steel beams set up is fixedly connected with on the edge of a wing of I-shaped steel beam, and two trompil floors are set up about the web symmetry; each perforated rib plate is provided with a plurality of trapezoidal through holes, and connecting lines of corresponding positions of all the trapezoidal through holes on the single perforated rib plate are parallel to the flange surface of the I-shaped steel beam; the trapezoidal through holes of the two perforated rib plates are arranged in a one-to-one correspondence manner, and the connecting line of the corresponding positions of the two perforated rib plates corresponding to the trapezoidal through holes is vertical to the web plate of the I-shaped steel beam; penetrating steel bars penetrate through the I-shaped steel beams corresponding to the two perforated rib plates. The utility model discloses compare traditional stud connecting piece, its bearing capacity will be high a lot, and the ductility is good, has great deformation before destroying, is the ductile destruction, and fatigue resistance can be good.
Description
Technical Field
The utility model relates to a bridge construction technical field, concretely relates to novel trapezoidal trompil PBL shear force key of connecting reinforcement and concrete.
Background
With the rapid development of bridge structures in China, the bridge structures in the form of steel-concrete combination are more and more widely applied. The steel-concrete composite beam properly combines two different materials, fully exerts the respective advantages of the steel and the concrete materials, improves the stability and the material utilization rate of the bridge structure, and reduces the manufacturing cost. The steel-concrete composite beam is formed by connecting steel and concrete materials into a whole through a longitudinal shear connection structure, so that the aim of integral stress is fulfilled, and the advantages of good compression of concrete and good tension of steel materials are fully exerted. The stress advantage of the composite beam is embodied in the combination effect of concrete and steel, and the shear connector is the key for realizing the combination effect of the steel beam and the concrete slab. The connecting pieces in the composite beam are various and classified according to forms, and generally comprise a steel bar connecting piece, a profile steel connecting piece, a stud connecting piece, a perforated plate connecting piece and the like. The stud connecting piece has good deformation performance, can adjust uneven stress among studs, can give full play to the bearing capacity of all studs, and is convenient to construct and widely adopted in composite beams.
The pin is a special shear connector, which is composed of a pin head, a pin rod and a welding end part. The diameter of the bolt head is larger than that of the bolt rod, and the welding end is provided with welding flux (welding flux) and is welded by a special welding gun. Thus, the pegs are also known as weld pegs or colloquially as tacks. The experimental research shows that when the composite beam is under the action of external load, the cylindrical head stud connecting piece can slide the interface due to the deformation of the cylindrical head stud connecting piece, and the external load can generate higher concentrated stress at the bottom of the stud connecting piece, so that the composite beam can be greatly deformed. At the moment, the whole stud connecting piece is in bending moment, shearing force and pulling force, so that the pressure borne by the bottom of the stud is the largest, the pressure is gradually reduced along the height direction, and the stud connecting piece is in a pulled state when being close to the bottom of the stud. Under the action of external load, the shear strength of the round-column stud bolt nail in the composite beam changes as follows:
1) when the strength grade of concrete adopted in the composite beam is high and the diameter of the stud connecting piece is small, the stud reaches the limit shear strength when the composite beam is damaged and is damaged by shearing. The shear strength of the stud connector is irrelevant to the strength grade of concrete and only depends on the material of the stud connector.
2) When the concrete strength grade adopted in the composite beam is lower and the diameter of the stud connecting piece is larger, the shear strength of the stud is higher, the stud does not reach the limit shear strength when the composite beam is damaged, but the concrete around the stud is often crushed or split.
3) When the lightweight aggregate concrete is adopted in the composite beam, the deformation of the stud is small and the stud is still almost straight under the action of external load because the strength of the lightweight aggregate concrete is low, and the stud is not damaged. If the embedded depth of the peg is not enough, the peg is easy to pull out.
The steel-concrete composite bridge realizes common stress through the shear connectors, and the design of the connectors is also the key of the design of the bridge, which directly influences the overall bearing capacity of the composite bridge. The stud is a connecting piece for combining and connecting floor beam and reinforced concrete floor slab, and adopts arc-drawing type stud welding machine and welding gun, and uses deoxidized arc heat-resisting ceramic seat ring. The steel structure connecting piece is used for various steel structure projects, plays a role in rigid combined connection in different connecting pieces, and is used for bearing structures of most high-rise buildings at home, namely a stiffened column is used, namely the outer layer of the section steel is wrapped by concrete. The stud is welded on the section steel column such as H-shaped steel, a cross column and a tubular column, so that the connection strength of the section steel column and concrete can be greatly enhanced, and the overall stress performance of the stiff column is improved. The traditional connection mode is mostly in stud connection, and the stud connecting piece is a relatively flexible connecting piece, and has low bearing capacity and poor anti-sliding capacity.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a connecting reinforcement that can effectively improve bearing capacity and novel trapezoidal trompil PBL shear force key of concrete.
For solving the technical problem, the utility model discloses the technical scheme who adopts does:
a novel trapezoidal perforated PBL shear key for connecting a steel bar and concrete comprises an I-shaped steel beam, wherein two perforated rib plates arranged in parallel to a web plate of the I-shaped steel beam are fixedly connected to a flange of the I-shaped steel beam, and the two perforated rib plates are symmetrically arranged around the web plate; each perforated rib plate is provided with a plurality of trapezoidal through holes, and connecting lines of corresponding positions of all the trapezoidal through holes on the single perforated rib plate are parallel to the flange surface of the I-shaped steel beam; the trapezoidal through holes of the two perforated rib plates are arranged in a one-to-one correspondence manner, and the connecting line of the corresponding positions of the two perforated rib plates corresponding to the trapezoidal through holes is vertical to the web plate of the I-shaped steel beam; penetrating steel bars penetrate through the I-shaped steel beams corresponding to the two perforated rib plates.
As a further technical scheme of the above technical scheme, two penetrating steel bars penetrate through each trapezoidal through hole of the perforated rib plate, the two penetrating steel bars are arranged at a certain interval and perpendicular to the perforated rib plate.
As a further technical scheme of the technical scheme, each trapezoidal through hole of the perforated rib plate is isosceles trapezoid.
As a further technical scheme of the technical scheme, the large end of the trapezoidal through hole is located at one end far away from the I-shaped steel beam, and the small end is sealed by the flange of the I-shaped steel beam.
Compared with the prior art, the utility model, following advantage and beneficial effect have: the utility model discloses compare traditional stud connecting piece, its bearing capacity will be high a lot, and the ductility is good, has great deformation before destroying, is the ductile destruction, and fatigue resistance can be good.
Drawings
Fig. 1 is a front view structure diagram of the present invention.
Fig. 2 is a schematic side view of the present invention.
Fig. 3 is a schematic top view of the present invention.
Fig. 4 is a front view of a prior art peg connector.
Fig. 5 is a top view of a prior art peg connector.
Fig. 6 is a first set of tests of a prior art peg attachment, load-slip plot one, corresponding to the peg attachment.
FIG. 7 is a second set of prior art load-slip curves for a peg attachment corresponding to a second set of tests for a peg attachment.
Fig. 8 is a schematic view of an application front view structure of the trapezoidal opening PBL shear key of the present invention.
Fig. 9 is a schematic top view of the application of the trapezoidal opening PBL shear key of the present invention.
Fig. 10 is a load-slip curve diagram of the trapezoidal-opening PBL shear key of the present invention.
The explanation of each reference number in the figure is: the steel plate comprises a web plate 1, a flange 2, an opening rib plate 3, a trapezoidal through hole 4, a through steel bar 5, a steel beam 21, a stud 22, a concrete block 23 and a stirrup 24.
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, so as to further understand the concept, the technical problems to be solved, the technical features constituting the technical solutions, and the technical effects brought by the technical solutions of the present invention.
It should be understood that the description of these embodiments is illustrative and not restrictive in any way, and that the embodiments described are only some but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of preferred embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-3, a novel trapezoidal trompil PBL shear force key of connecting reinforcement and concrete include I-shaped steel beam 21, the trompil floor 3 that the web 1 of two parallel I-shaped steel beams 21 of fixedly connected with set up on the edge of a wing 2 of I-shaped steel beam 21, and two trompil floors 3 set up about 1 symmetry of web. Each perforated rib plate 3 is provided with a plurality of trapezoidal through holes 4, and connecting lines of corresponding positions of all the trapezoidal through holes 4 on a single perforated rib plate 3 are parallel to the surface of the flange 2 of the I-shaped steel beam 21. The trapezoidal through holes 4 of the two perforated rib plates 3 are arranged in a one-to-one correspondence manner, and the connecting line of the corresponding positions of the two perforated rib plates 3 corresponding to the trapezoidal through holes 4 is vertical to the web plate 1 of the I-shaped steel beam 21. Penetrating through steel bars 5 into the trapezoidal through holes 4 corresponding to the two perforated rib plates 3, connecting the penetrating steel bars 5 with stirrups 24 in the concrete block 23, and finally pouring concrete to wrap the perforated rib plates 3, the penetrating steel bars 5 and the stirrups 24 to form an integral structure. The utility model discloses compare in the connected mode of other traditional reinforcing bars and concrete, have advantages such as bearing capacity is big, the ductility is good, fatigue resistance is good, provides new selection for being connected of reinforcing bar and concrete.
Every trapezoidal through-hole 4 of trompil floor 3 has penetrated two and has run through reinforcing bar 5, and two run through reinforcing bar 5 intervals certain distance set up, and equal perpendicular trompil floor 3 sets up. Compared with a bolt connection mode, the two through steel bars 5 act together, the bearing capacity is further increased, and the ductility and the fatigue resistance are further improved.
Each trapezoidal through hole 4 of the perforated rib plate 3 is isosceles trapezoid, and the isosceles trapezoid enables the stress of the trapezoidal through holes 4 to be more balanced, so that the stress concentration is avoided. The big end of the trapezoid through hole 4 is located at one end far away from the I-shaped steel beam 21, the small end is sealed by the flange 2 of the I-shaped steel beam 21, the through reinforcement 5 where the big end is located serves as a main stress reinforcement, the through reinforcement 5 where the small end is located serves as an auxiliary stress reinforcement, and the big end is stressed more, so that the opening of the trapezoid through hole 4 corresponding to the big end is larger, more concrete is poured in the big end, the stress is more balanced, the big end is stressed less, and the force on the side of the I-shaped steel beam 21 needs to be borne, so that the poured concrete is smaller and the stress is more direct. The trapezoidal through holes 4 can effectively balance the stress form, so that the stress of the whole PBL shear key is more reasonable. The concrete size of the opening is determined according to calculation on one hand, and the grain composition size of the concrete is also considered on the other hand, so that the compactness of the concrete at the embedded node position is ensured, and finally the effect of resisting shear force jointly by the concrete and the in-hole penetrating steel bar 5 is achieved.
Fig. 4 and 5 show the connection form of the peg-type connector in the prior art, and the overall load-slip curve is shown in fig. 6 and 7 (fig. 6 and 7 show the load-slip curves of the two groups of peg-type connectors with the total load-slip curves of the two groups, and a single group is provided with 3 test pieces), and it can be seen from the load-slip curves in fig. 6 and 7 that the slippage of the peg-type connector is about 9mm, the ductility performance is poor, and the maximum single-side load-bearing capacity is only 382.1 KN.
Fig. 8 and 9 show the utility model discloses an implement and use structural style, its whole load-slip curve is as shown in fig. 10, can see from this load-slip curve that the slippage of trapezoidal trompil PBL shear force key can reach about 30mm, has fine ductility performance, and its haplopore bearing capacity can reach 718.3KN (fig. 10 shows that the total load-slip curve graph that has the trapezoidal trompil PBL shear force key of 6 pore structures as shown in fig. 8 is equipped with 3 test pieces), and it is high than the bolt connecting piece bearing capacity.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are conventionally placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a novel trapezoidal trompil PBL shear force key of connecting reinforcing bar and concrete which characterized in that: the steel plate comprises an I-shaped steel beam (21), wherein the flange (2) of the I-shaped steel beam (21) is fixedly connected with two perforated rib plates (3) which are arranged in parallel with the web plate (1) of the I-shaped steel beam (21), and the two perforated rib plates (3) are symmetrically arranged relative to the web plate (1); each perforated rib plate (3) is provided with a plurality of trapezoidal through holes (4), and connecting lines of corresponding positions of all the trapezoidal through holes (4) on the single perforated rib plate (3) are parallel to the surface of the flange (2) of the I-shaped steel beam (21); the trapezoidal through holes (4) of the two perforated rib plates (3) are arranged in a one-to-one correspondence manner, and the connecting line of the corresponding positions of the two perforated rib plates (3) corresponding to the trapezoidal through holes (4) is vertical to the web plate (1) of the I-shaped steel beam (21); penetrating steel bars (5) penetrate into the I-shaped steel beams (21) corresponding to the two perforated rib plates (3).
2. The novel trapezoidal hole PBL shear key for connecting the steel bar and the concrete according to claim 1, characterized in that: every trapezoidal through-hole (4) of trompil floor (3) penetrate two and run through reinforcing bar (5), and two run through reinforcing bar (5) interval certain distance sets up, and equal perpendicular trompil floor (3) set up.
3. The novel trapezoidal hole PBL shear key for connecting the steel bar and the concrete according to claim 1, characterized in that: each trapezoidal through hole (4) of the perforated rib plate (3) is isosceles trapezoid.
4. The novel trapezoidal hole PBL shear key for connecting the steel bar and the concrete according to claim 3, characterized in that: the big end of the trapezoid through hole (4) is positioned at one end far away from the I-shaped steel beam (21), and the small end is sealed by the flange (2) of the I-shaped steel beam (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022953767.XU CN212611920U (en) | 2020-12-08 | 2020-12-08 | Novel trapezoidal trompil PBL shear force key of connecting reinforcing bar and concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022953767.XU CN212611920U (en) | 2020-12-08 | 2020-12-08 | Novel trapezoidal trompil PBL shear force key of connecting reinforcing bar and concrete |
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| CN212611920U true CN212611920U (en) | 2021-02-26 |
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| CN202022953767.XU Expired - Fee Related CN212611920U (en) | 2020-12-08 | 2020-12-08 | Novel trapezoidal trompil PBL shear force key of connecting reinforcing bar and concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588454A (en) * | 2021-06-11 | 2021-11-02 | 山东大学 | Shear key bonding-slippage constitutive relation testing method and device |
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2020
- 2020-12-08 CN CN202022953767.XU patent/CN212611920U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588454A (en) * | 2021-06-11 | 2021-11-02 | 山东大学 | Shear key bonding-slippage constitutive relation testing method and device |
| CN113588454B (en) * | 2021-06-11 | 2023-09-12 | 山东大学 | Method and device for testing bonding-sliding constitutive relation of shear key |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210226 Termination date: 20211208 |
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| CF01 | Termination of patent right due to non-payment of annual fee |