Connecting structure for improving shear bearing capacity of connection of steel beam and concrete beam
By adopting the structure of anchor plate group and screw group at the connection between steel beams and concrete beams, the problem that the shear bearing capacity of anchor bolt connections is limited by the shear bearing capacity of base material concrete is solved, and the shear bearing capacity is significantly improved. The shear bearing capacity of the node reaches 144.4kN.
Patent Information
- Application Number
- CN202420951968.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-06
AI Technical Summary
In the prior art, when the anchor bolt connects the steel beam and the concrete beam, the design value of the shear bearing capacity of the base material concrete is small, resulting in the limitation of the final shear bearing capacity of the anchor bolt, which affects the stability and shear resistance of the connection.
Adopt a connecting structure including an anchor plate group and a screw group. The anchor plate group consists of a first anchor plate, a second anchor plate and a third anchor plate. The screw group includes a plate-through screw and a beam-through screw, which is fixed by welding and nuts to improve the Shear bearing capacity of steel beams and concrete beams.
The shear bearing capacity of steel beams and concrete beams has been significantly improved, and the possibility of building renovation and connection stability has been increased. The shear bearing capacity of nodes has reached 144.4kN, which is far higher than the 15.8kN of the traditional method.
Smart Images
Figure CN222295320U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of reinforcement design engineering, in particular to a connection structure for improving the shear bearing capacity of the connection between a steel beam and a concrete beam. Background Art
[0002] During the process of building renovation, the connection between the newly added steel beam and the original concrete beam is often encountered. The conventional practice is to set a connecting plate on the concrete beam and connect it with the steel beam web bolts, and the connecting plate and the concrete beam are fixed with chemical anchors. The shear bearing capacity of the anchor connection is divided into two parts: one is the shear bearing capacity of the anchor steel itself, and the other is the shear bearing capacity of the edge of the base concrete. The smaller value of the two is taken as the final shear bearing capacity of the anchor.
[0003] Deficiencies of existing technology:
[0004] At present, the material of anchor bolts is grade 6.8. Taking the anchor bolt with a diameter of 16 as an example, the design value of the shear bearing capacity of a single anchor bolt reaches 23KN, and the shear bearing capacity of 6 anchor bolts is 138KN. However, wedge-shaped failure will occur when the anchor bolt is close to the edge of the base concrete. The design value of the shear bearing capacity of the base concrete is very small, which seriously affects the ultimate shear bearing capacity of the anchor bolt. Utility Model Content
[0005] The utility model aims to provide a connection structure for improving the shear bearing capacity of the connection between a steel beam and a concrete beam, so as to solve the problems raised in the above-mentioned background technology.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a connection structure for improving the shear bearing capacity of the connection between a steel beam and a concrete beam, comprising a steel beam, wherein the steel beam is provided with a connection assembly, and the connection assembly comprises an anchor plate group and a screw group.
[0007] Preferably, the anchor plate group includes a first anchor plate, a second anchor plate and a third anchor plate, the first anchor plate is installed on the top of the steel beam, and the second anchor plate and the third anchor plate are installed on both sides of the steel beam.
[0008] Preferably, the screw group includes a plurality of through-plate screws and a plurality of through-beam screws, the through-plate screws pass through the steel beam to connect the first anchor plate and the second anchor plate and pass through the steel beam to connect the first anchor plate and the third anchor plate, and the through-beam screws pass through the steel beam to connect the second anchor plate and the third anchor plate.
[0009] Preferably, both ends of the through-plate screw and both ends of the through-beam screw are fitted with nuts for fixing.
[0010] Preferably, the through-plate screw and the through-beam screw may be made of HRB400 grade steel bars.
[0011] Compared with the prior art, the beneficial effects of the utility model are:
[0012] The invention discloses a connection structure for improving the shear bearing capacity of the connection between a steel beam and a concrete beam. The connection structure comprises an anchor plate group and a screw rod group. The anchor plate group comprises a first anchor plate, a second anchor plate and a third anchor plate. The screw rod group comprises a through-plate screw and a through-beam screw. The first anchor plate is installed above the steel beam. The second anchor plate and the third anchor plate are arranged on both sides of the steel beam. The through-plate screw is passed through the first anchor plate and the steel beam and welded to the second anchor plate and the second anchor plate respectively. The nuts at both ends of the through-plate screw are tightened and fixed. The through-beam screw is then passed through the steel beam to connect the second anchor plate and the third anchor plate. The nuts at both ends of the through-beam screw are tightened. Therefore, the shear bearing capacity of the connection between the steel beam and the concrete beam is greatly improved, thereby increasing the possibility of transformation. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a comparison diagram of the utility model;
[0014] Figure 2 It is a schematic diagram of the overall structure of the utility model;
[0015] In the figure: 110, steel beam; 121, first anchor plate; 122, second anchor plate; 123, third anchor plate; 131, through-plate screw; 132, through-beam screw; 140, nut. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0018] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integrated connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.
[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.
[0020] Example
[0021] See also Figure 1-2 As shown, the utility model provides a technical solution for a connection structure that improves the shear bearing capacity of the connection between a steel beam and a concrete beam: it includes a steel beam 110, a connection assembly is arranged on the steel beam 110, the connection assembly includes an anchor plate group and a screw group, the anchor plate group includes a first anchor plate 121, a second anchor plate 122 and a third anchor plate 123, the first anchor plate 121 is installed on the top of the steel beam 110, the second anchor plate 122 and the third anchor plate 123 are installed on both sides of the steel beam 110, the screw group includes a plurality of through-plate screws 131 and a plurality of through-beam screws 132, the through-plate screw 131 passes through the steel beam 110 to connect the first anchor plate 121 and the second anchor plate 122, and passes through the steel beam 110 to connect the second anchor plate 122 and the third anchor plate 123, and both ends of the through-plate screw 131 and the through-beam screw 132 are provided with nuts 140 that are intended to be matched for fixing. During construction, holes are pre-drilled at the relative positions of the steel beam 110, the first anchor plate 121, the second anchor plate 122 and the third anchor plate 123, the first anchor plate 121 is installed above the steel beam 110, the second anchor plate 122 and the third anchor plate 123 are arranged on both sides of the steel beam 110, the through-plate screw 131 is passed through the first anchor plate 121 and the steel beam 110 and welded to the second anchor plate 122 and the third anchor plate 123 respectively, the nuts 140 at both ends of the through-plate screw 131 are tightened and fixed, the weld length is greater than 5d, d is the diameter of the through-plate screw 131, and then the through-beam screw 132 is passed through the steel beam 110 to connect the second anchor plate 122 and the third anchor plate 123, the nuts 140 at both ends of the through-beam screw 132 are tightened, so that the shear bearing capacity of the connection between the steel beam 110 and the concrete beam is greatly improved, and the possibility of transformation is increased.
[0022] Furthermore, the material of the plate-penetrating screw rod 131 and the beam-penetrating screw rod 132 can be HRB400 grade steel bars.
[0023] Furthermore, for example, the strength grade of a concrete beam is C30, the anchor bolt is grade 6.8, the specification is M20, the effective anchoring depth is 200, the horizontal spacing of the anchor bolt is 200mm; the screw rod is Q355, the diameter is φ20;
[0024] Figure 1 Shear bearing capacity of the method:
[0025] Calculation of shear capacity of anchor steel
[0026] ψ E,v =1.0
[0027] f ud,v =220N / mm 2
[0028] A s =245mm 2
[0029] V a =ψ E,v f ud,v A s =53.9kN
[0030] 53.9*2=107.8kN
[0031] f cu,k =30N / mm 2
[0032] c1=200mm
[0033] d0=20mm
[0034] h ef =200mm
[0035] A cv =1.5c1*(3c1+s)=1.5*200*(3*200+200)=240000mm 2
[0036]
[0037]
[0038] GB50367-12013 16.3.6
[0039]
[0040] Combining the calculated values of both, the smaller value of the anchor steel and the base material concrete is taken as the shear bearing capacity of the connection between the steel beam 110 and the concrete beam, that is, 15.8 kN.
[0041] Figure 2Shear bearing capacity of the method:
[0042] according to Figure 2 The connection method converts the node shear bearing capacity into the tensile bearing capacity of the screw.
[0043] f=295N / mm 2
[0044] A=245mm 2
[0045] Tensile strength of the screw R N =295*245 / 1000=72.2kN
[0046] There are two screws with a total load capacity of 144.4KN.
[0047] In summary, Figure 2 The shear bearing capacity of the node connection reaches 144.4kN, which is much greater than Figure 1 15.8kN for the node connection.
[0048] The working principle of the utility model is as follows:
[0049] When the connection structure of the embodiment of the present invention is used to improve the shear bearing capacity of the connection between the steel beam and the concrete beam,
[0050] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A connection structure for improving the shear bearing capacity of a connection between a steel beam and a concrete beam, comprising a steel beam (110), characterized in that: The steel beam (110) is provided with a connection assembly, wherein the connection assembly comprises an anchor plate assembly and a screw rod assembly; The anchor plate group comprises a first anchor plate (121), a second anchor plate (122) and a third anchor plate (123); the first anchor plate (121) is installed on the top of the steel beam (110), and the second anchor plate (122) and the third anchor plate (123) are installed on both sides of the steel beam (110).
2. A connection structure for improving the shear bearing capacity of the connection between a steel beam and a concrete beam according to claim 1, characterized in that: The screw rod group comprises a plurality of plate-penetrating screw rods (131) and a plurality of beam-penetrating screw rods (132); the plate-penetrating screw rods (131) pass through the steel beam (110) to connect the first anchor plate (121) and the second anchor plate (122), and pass through the steel beam (110) to connect the first anchor plate (121) and the third anchor plate (123); and the beam-penetrating screw rods (132) pass through the steel beam (110) to connect the second anchor plate (122) and the third anchor plate (123).
3. A connection structure for improving the shear bearing capacity of the connection between a steel beam and a concrete beam according to claim 2, characterized in that: Both ends of the plate-penetrating screw rod (131) and both ends of the beam-penetrating screw rod (132) are matched with nuts (140) for fixing.
4. A connection structure for improving the shear bearing capacity of the connection between a steel beam and a concrete beam according to claim 2, characterized in that: The plate-penetrating screw rod (131) and the beam-penetrating screw rod (132) may be made of HRB400 grade steel bars.