Novel steel-concrete combined beam bridge shearing force connecting piece

Abstract

The invention relates to a novel steel-concrete combined beam bridge shearing force connecting piece which comprises a symmetrical corrugated plate, the symmetrical corrugated plate is made of memory alloy, the symmetrical corrugated plate is provided with a bottom plate and webs connected with the bottom plate, the webs are symmetrically arranged about the center line of the bottom plate, and web holes are formed in the two symmetrical webs; hooks are arranged at the ends of the symmetrical corrugated plates, and high-strength bolt holes are formed in the bottom plate. The deformed steel bars penetrate through the web plate holes in the height direction to connect the plurality of symmetrical corrugated plates in series; and the high-strength bolts are arranged in the high-strength bolt holes in a penetrating manner, so that the symmetrical corrugated plate pieces are connected with the steel beam sections. The shearing force connecting piece is good in anti-shearing connecting effect and excellent in structural fatigue performance. The symmetrical corrugated plates made of the memory alloy can have certain recovery capacity under the action of traffic loads and can absorb part of load stress.

Description

Technical Field

[0001] The present application relates to the field of bridge engineering, and in particular to a novel shear connector for a steel-concrete composite beam bridge. Background Art

[0002] The existing steel-concrete composite technology can give full play to the structural advantages of steel beams under tension and concrete under compression, and is widely used in the field of bridge engineering. The key to the construction of steel-concrete composite beam bridges lies in the steel-concrete joint section, whose structural form, force transmission effect and durability directly affect the safe operation of the structure. The structural form includes a non-cell rear pressure plate. The non-cell rear pressure plate joint section extends part of the concrete beam section into the steel beam section, and uses shear connectors to connect the steel panel and concrete into a whole. The force transmission structure is simple and the construction is convenient. At present, the optimization of shear connectors is an important topic in the research of steel-concrete combination.

[0003] At present, most steel-concrete composite beam bridges use welded studs and perforated steel plates as shear connectors. The construction workload of welded studs is large and the studs are easily damaged, while the perforated steel plates are complex and prone to fatigue damage. In actual use, under the influence of vehicle loads, environmental factors, etc., fatigue damage is more likely to occur at the weld position, resulting in shear connection failure, posing a serious threat to the structural safety of steel-concrete composite beam bridges. Summary of the invention

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] The present application provides a novel steel-concrete composite beam bridge shear connector, comprising:

[0006] A symmetrical corrugated plate, which is made of a memory alloy and comprises a bottom plate and a web connected to the bottom plate, wherein the webs are symmetrically arranged about the center line of the bottom plate, web openings are arranged on the symmetrical webs, and bolt holes are arranged on the bottom plate;

[0007] Deformed steel bars, which pass through the web openings to connect multiple symmetrical corrugated plate members in series;

[0008] High-strength bolts, high-strength bolts are inserted into bolt holes.

[0009] In one embodiment, the web is inclined relative to the bottom plate, the width of the bottom plate is greater than the distance between the upper openings of the two webs, and the upper ends of the webs are bent away from the openings to form an upper flange.

[0010] In one embodiment, the angle formed by the web, the bottom plate and the upper flange is in the range of 30° to 60°.

[0011] In one embodiment, the end of the upper flange is bent into a hook.

[0012] In one embodiment, the web opening is located at the center of the symmetrical corrugated plate in the height direction, and the diameter of the web opening is at least twice the diameter of the deformed steel bar.

[0013] In one embodiment, the material of the symmetrical corrugated plate is titanium-nickel alloy.

[0014] In one embodiment, the bottom plate is attached to the pressure plate, and the symmetrical corrugated plate is fixed to the pressure plate by high-strength bolts.

[0015] In one embodiment, an array of symmetrical corrugated plate members is arranged on the pressure plate.

[0016] In one embodiment, the symmetrical corrugated plate members are staggered in the transverse direction of the bridge on the pressure plate with the prestressed steel strands.

[0017] This application has at least the following beneficial effects:

[0018] In this application, the shear connector has a good shear connection effect and excellent structural fatigue performance. Since the symmetrical corrugated plate is made of memory alloy, it has a certain recovery ability under the action of traffic load and can absorb part of the load stress. Compared with traditional welded studs and perforated steel plate connectors, the shear connection effect is better. The use of high-strength bolt connection overcomes the shortcomings of welded studs and perforated steel plate connectors that mostly use weld connections, and the structural fatigue performance is excellent, thereby ensuring the structural integrity and durability of the steel-concrete composite beam bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a composite beam bridge according to an embodiment of the present application.

[0020] Figure 2 It is a schematic diagram of the steel beam section structure of an embodiment of the present application.

[0021] Figure 3 It is a schematic diagram of the structure of the symmetrical corrugated plate according to an embodiment of the present application.

[0022] Figure 4 It is a schematic diagram of the high-strength bolt structure of an embodiment of the present application.

[0023] Figure 5 It is a schematic diagram of the arrangement of the symmetrical corrugated plate members according to an embodiment of the present application.

[0024] Reference numerals:

[0025] 1. Concrete beam section;

[0026] 2. Steel beam section; 21. Upper flange plate; 22. Longitudinal diaphragm; 23. Prestressed anchor box; 24. Pressure plate; 25. Stiffening rib; 26. Lower flange plate;

[0027] 3. Symmetrical corrugated plate; 31. Upper flange; 32. Bolt hole; 33. Web opening; 34. Bottom plate;

[0028] 4. Deformed steel bars;

[0029] 5. Prestressed steel tendons;

[0030] 6. High-strength bolt; 61. Screw head; 62. Bolt rod; 63. Nut; 64. Washer. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if the terms "length", "width", "thickness", "up", "down", "vertical", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first", "second", and "third" appear, these terms 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", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" or "set on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0038] Reference Figure 1 As shown, in some embodiments of the present application, a new type of shear connector for steel-concrete composite beam bridge is provided, including a shear connector assembly, through which a concrete beam section 1 and a steel beam section 2 are connected. The steel beam section 2 includes a pressure plate 24, and the shear connector assembly is arranged on one side of the pressure plate 24. The shear connector assembly includes a symmetrical corrugated plate 3, a deformed steel bar 4, and a high-strength bolt 6. The symmetrical corrugated plate 3 is made of a memory alloy, and preferably, the memory alloy is a titanium-nickel alloy. Specifically, the combined Figure 3As shown, the symmetrical corrugated plate 3 has a bottom plate 34 and at least a web, the web is connected to the two corresponding ends of the bottom plate 34, the web is inclined relative to the bottom plate 34, and the web is symmetrically arranged, so that the width of the bottom plate 34 is greater than the spacing of the opening formed at the upper end of the web. When pouring concrete into the side of the pressure plate 24 where the shear connection assembly is arranged, the concrete will fill the space formed by the web and the bottom plate 34 to form an equilateral trapezoid, and the concrete beam section 1 formed after the concrete solidifies has a raised block in the shape of an inverted equilateral trapezoid, which is embedded in the space formed by the web and the bottom plate 34, so that the concrete beam section 1 and the steel beam section 2 are firmly combined. The inverted equilateral trapezoid is specifically that the short bottom side is close to the concrete beam section 1, and the long bottom side is close to the steel beam section 2. Exemplarily, the number of webs is two.

[0039] Furthermore, the upper end of the web is bent away from the opening to form an upper flange 31. After the concrete is poured, the concrete will be filled into the angle formed by the upper flange 31 and the web. The upper flange 31 will block the concrete in the angle between the upper flange 31 and the web from moving away from the steel beam section 2, thereby making the combination of the concrete beam section 1 and the steel beam section 2 more stable.

[0040] In the present embodiment, the angle range of the angle α formed by the web, the bottom plate 34 and the upper flange 31 is 30° to 60°. Specifically, the angles formed by the web, the bottom plate 34 and the upper flange 31 are consistent, so that the bottom plate 34 and the upper flange 31 are arranged in parallel. It can be understood that the angle α formed by the web and the bottom plate 34, and the web and the upper flange 31 can be selected from any angle between 30° and 60°. However, preferably, the positional relationship between the upper flange 31 and the bottom plate 34 is maintained. More specifically, the upper flange 31 starts from the junction with the web, and the upper flange 31 is inclined toward the bottom plate 34, that is, the upper flange 31 is inclined toward the steel beam section 2, so as to increase the resistance to the separation of the concrete beam section 1 and the steel beam section 2.

[0041] Furthermore, the free end of the upper flange 31 is bent into a hook, and the free end is the other end of the upper flange 31 relative to the connecting web. The angle of the hook β is not greater than 180° to avoid the opening formed by the hook and the lower part of the upper flange 31 being reduced, which affects the pouring of concrete into the hook. The angle of the hook is the arc angle of the arc-shaped hook. Preferably, the angle of the hook β is 180°.

[0042] In this solution, the shape of the symmetrical folded plate 3 is formed by bending the memory alloy sheet. First, the symmetrical folded plate 3 formed by bending has strong integrity and higher strength. Second, the symmetrical folded plate 3 formed by bending has a complex shape, which makes the contact area between the symmetrical folded plate 3 and the concrete beam section 1 larger to ensure the combination stability.

[0043] The web of the symmetrical corrugated plate 3 is provided with an opening 33, and the bottom plate 34 is provided with a high-strength bolt hole 32. The deformed steel bar 4 passes through the web opening 33, connecting multiple symmetrical corrugated plates 3 in series. The bottom plate 34 is attached to the pressure plate 24, and the symmetrical corrugated plate 3 is fixed to the pressure plate 24 by high-strength bolts 6. Figure 5 As shown, the symmetrical folded plate members 3 are arranged in an array on the pressure plate 24, and are connected to the concrete beam section 1 through multiple symmetrical folded plate members 3 to improve the bonding stability. For example, the width of the bottom plate 34 is 200-300 mm, the height of the symmetrical folded plate members 3 is 100-150 mm, and the width of the symmetrical folded plate members 3 is 100-150 mm. The width direction of the bottom plate 34, the height direction of the symmetrical folded plate members 3, and the width direction of the symmetrical folded plate members 3 are perpendicular to each other.

[0044] Specifically, the web opening 33 is located at the center of the symmetrical corrugated plate 3 in the height direction, and the diameter of the web opening 33 is larger than the diameter of the deformed steel bar 4. Preferably, the diameter of the web opening 33 is at least twice the diameter of the deformed steel bar 4, so that the deformed steel bar 4 can pass through the web opening 33 smoothly.

[0045] More specifically, refer to Figure 4 As shown, the high-strength bolt 6 includes a screw head 61, a bolt rod 62, a nut 63 and a gasket 64. The nut 63 is connected to the bolt rod 62. The bolt rod 62 passes through the high-strength bolt hole 32 and the pressure plate 24. The screw head 61 and the nut 63 are located on both sides of the bottom plate 34 and the pressure plate 24. The screw head 61 is pressed on the bottom plate 34, and correspondingly, the nut 63 is pressed on the pressure plate 24. By screwing the nut 63, the bottom plate 34 and the pressure plate 24 can be clamped to fix the bottom plate 34 and the pressure plate 24. In addition, two gaskets 64 are also sleeved on the bolt rod 62. The gaskets 64 are padded between the screw head 61 and the bottom plate 34, and between the nut 63 and the pressure plate 24, so that the bottom plate 34 and the pressure plate 24 can be stably clamped.

[0046] In some embodiments of the present application, Figure 1 , and combined with Figure 2 As shown, the symmetrical corrugated plate 3 is staggered with the prestressed steel strand 5 on the bearing plate 24 in the transverse direction. The transverse direction is the direction from the steel beam section 2 to the concrete beam section 1, or the bridge width direction. The axial direction of the prestressed steel strand 5 is arranged parallel to the axial direction of the high-strength bolt 6. The prestressed steel strand 5 can reduce the deadweight of the concrete beam section 1. Preventing prestress and tensioning the prestressed steel strand 5 can greatly reduce the deflection of the concrete beam section 1.

[0047] Furthermore, the steel beam section 2 also includes a longitudinal diaphragm 22 and a prestressed anchor box 23, and a pressure plate 24 is arranged on one side of the longitudinal diaphragm 22. The prestressed steel bundle 5 is connected to the prestressed anchor box 23, and the prestressed anchor box 23 is installed on the longitudinal diaphragm 22. Specifically, there are two vacancies on the longitudinal diaphragm 22, and the vacancies are used to install the prestressed anchor box 23, so that the prestressed anchor box 23 is installed on the longitudinal diaphragm 22. The two vacancies are respectively close to the upper part and the lower part, and the vacancies are close to the pressure plate 24. Exemplarily, the vacancies are avoidance positions formed at the angle formed by the upper and lower surfaces of the longitudinal diaphragm 22 and the side surfaces. Stiffening ribs 25 are also provided in the longitudinal diaphragm 22 to improve the structural strength of the steel beam section 2.

[0048] Furthermore, the steel beam section 2 further comprises an upper flange plate 21 and a lower flange plate 26, which are respectively installed on the upper and lower parts of the longitudinal diaphragm 22. The upper flange plate 21 and the lower flange plate 26 can cover the prestressed anchor box 23 installed in the vacant space.

[0049] The above embodiments are used to further illustrate the present application, but the present application is not limited to these specific implementations. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be understood to be within the scope of protection of the present application.

Claims

1. A new type of shear connector for steel-concrete composite beam bridge, characterized in that: include: A symmetrical folded plate (3), the symmetrical folded plate (3) being made of a memory alloy, the symmetrical folded plate (3) comprising a bottom plate (34) and a web connected to the bottom plate (34), the webs being symmetrically arranged about the center line of the bottom plate (34), web openings (33) being provided on the symmetrical webs, and bolt holes (32) being provided on the bottom plate (34); Deformed steel bars (4), the deformed steel bars (4) passing through the web openings (33) to connect the plurality of symmetrical corrugated plate elements (3) in series; A high-strength bolt (6), wherein the high-strength bolt (6) is inserted into the bolt hole (32).

2. The novel steel-concrete composite beam bridge shear connector according to claim 1 is characterized in that: The web is arranged obliquely relative to the bottom plate (34); the width of the bottom plate (34) is greater than the distance between the upper openings of the two webs; and the upper ends of the webs are bent away from the openings to form an upper flange (31).

3. The novel steel-concrete composite beam bridge shear connector according to claim 2 is characterized in that: The angle formed by the web, the bottom plate (34) and the upper flange (31) is in the range of 30° to 60°.

4. The novel steel-concrete composite beam bridge shear connector according to claim 2 is characterized in that: The end of the upper flange (31) is bent into a hook.

5. The novel steel-concrete composite beam bridge shear connector according to claim 1 is characterized in that: The web opening (33) is located at the center of the symmetrical corrugated plate (3) in the height direction, and the diameter of the web opening (33) is at least twice the diameter of the deformed steel bar (4).

6. The novel steel-concrete composite beam bridge shear connector according to claim 1 is characterized in that: The material of the symmetrical folded plate (3) is titanium-nickel alloy.

7. The novel steel-concrete composite beam bridge shear connector according to any one of claims 1 to 6, characterized in that: The bottom plate (34) is attached to the pressure plate (24), and the symmetrical corrugated plate member (3) is fixed to the pressure plate (24) by means of the high-strength bolts (6).

8. The novel steel-concrete composite beam bridge shear connector according to claim 7 is characterized in that: The symmetrical folded plate elements (3) are arranged in an array on the pressure plate (24).

9. The novel steel-concrete composite beam bridge shear connector according to claim 8 is characterized in that: The symmetrical folded plate members (3) are arranged in a staggered manner with the prestressed steel strands (5) in the transverse direction on the pressure bearing plate (24).

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