A carbon fiber cloth reinforced concrete beam column reinforcing member

Abstract

The application discloses a kind of carbon fiber cloth reinforced concrete beam column reinforcing components, the reinforcing component includes stand and the lateral beam fixedly connected with stand, lateral beam is less than the cross-sectional area of stand, the upper and lower sides of lateral beam are all bonded and fixed with first carbon fiber cloth along length direction, the outer surface of lateral beam and first carbon fiber cloth is bonded and fixed with second carbon fiber cloth, the outer surface of the upper and lower ends of stand is all bonded and fixed with third carbon fiber cloth.The application is by being provided with first carbon fiber cloth and second carbon fiber cloth on lateral beam, third carbon fiber cloth and fourth carbon fiber cloth are set on stand, realize the connection of fiber cloth with lateral beam and stand, and two reinforcing members are set in the end of lateral beam close to stand, not only can avoid the end of fourth carbon fiber cloth peeling, but also can effectively bear the tensile shear composite stress at joint, improve the pertinence and reliability of joint reinforcement, ensure that the structure is long-term stable and reliable after reinforcement.

Description

Technical Field

[0001] This invention belongs to the field of concrete beam and column reinforcement technology, specifically relating to a carbon fiber reinforced concrete beam and column reinforcement component. Background Technology

[0002] Concrete beam-column joints are core load-bearing components in building structures, responsible for load transfer, force redirection, and dispersion between beams and columns. Their load-bearing capacity directly determines the stability and safety of the overall structure. During long-term use, beam-column joints are susceptible to damage such as crack development, concrete spalling, and steel reinforcement corrosion due to repeated loads, environmental erosion, material aging, and construction defects. This leads to a degradation of the joint's shear and bending resistance, and may even cause overall structural failure. Therefore, reinforcement is necessary.

[0003] Carbon fiber cloth has been widely used in the field of concrete structure reinforcement due to its advantages such as lightweight, high strength, corrosion resistance, convenient construction, and minimal impact on the self-weight of the original structure. Currently, the carbon fiber cloth reinforcement method for beam-column joints mostly involves bonding carbon fiber cloth to the surface of the beam and column respectively. However, in this type of method, the connection between the carbon fiber cloth in the joint area and the carbon fiber cloth on the surface of the beam and column is weak, relying solely on adhesive for bonding. The cohesive force-bearing capacity between the cloth layers is poor, and the ends of the carbon fiber cloth wrapped at the joint lack an effective fixing structure, making them prone to warping and peeling under load, which significantly reduces the reinforcement effect. Summary of the Invention

[0004] (1) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a carbon fiber reinforced concrete beam-column reinforcement component. This reinforcement component is designed to solve the problem that existing methods of reinforcing beam-column joints with carbon fiber cloth rely solely on adhesives for bonding, resulting in poor synergistic stress distribution between the cloth layers and ineffective reinforcement.

[0006] (2) Technical solution

[0007] To address the aforementioned technical problems, this invention provides a carbon fiber reinforced concrete beam-column reinforcement component. The reinforcement component includes a column and a crossbeam fixedly connected to the column. The crossbeam has a smaller cross-sectional area than the column. First carbon fiber cloth is bonded and fixed along the length of both the upper and lower sides of the crossbeam. Second carbon fiber cloth is bonded and fixed to the outer surfaces of the crossbeam and the first carbon fiber cloth. Third carbon fiber cloth is bonded and fixed to the outer surfaces of both the upper and lower ends of the column. Fourth carbon fiber cloth is bonded and fixed to the front and rear sides of the column at the connection point with the crossbeam. Both ends of the fourth carbon fiber cloth extend to the second carbon fiber cloth on the crossbeam. Two reinforcing members are provided at the end of the crossbeam closest to the column. The two reinforcing members are connected and fixed together by a first bolt and are used to press against the end of the fourth carbon fiber cloth.

[0008] Preferably, the second and third carbon fiber cloths are both U-shaped cloth hoop structures that are wound and fixed, and the fourth carbon fiber cloth is a U-shaped cloth hoop structure. The number of cloth hoop structures for the second, third, and fourth carbon fiber cloths is multiple.

[0009] Furthermore, the width of the hoop of the second, third, and fourth carbon fiber cloths is 120-200mm, and the overlap length of the hoop is ≥150mm.

[0010] Furthermore, the first carbon fiber cloth, the second carbon fiber cloth, the third carbon fiber cloth, and the second carbon fiber cloth are all bonded and fixed with epoxy resin-based adhesive, and nano-silica powder is added inside the epoxy resin-based adhesive.

[0011] Furthermore, the reinforcing component includes a rectangular plate with a groove, both ends of which are integrally formed with bent portions. A right-angled triangular reinforcing plate is welded and fixed between the bent portions and the rectangular plate. The groove of the rectangular plate is fitted onto the crossbeam, and the reinforcing plate is attached to the side of the column.

[0012] Furthermore, a first through hole is provided on the bent part, and a first bolt is inserted into the front and rear first through holes.

[0013] Furthermore, a second through hole is provided on the reinforcing plate, and blind holes corresponding to the second through hole are provided on both the left and right sides of the column. Expansion bolts are inserted into the second through hole and the blind holes.

[0014] (3) Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention connects the fiber cloth to the beam and the column by setting a first carbon fiber cloth and a second carbon fiber cloth on the crossbeam, and a third carbon fiber cloth and a fourth carbon fiber cloth on the column. Furthermore, two reinforcing members are set at the end of the crossbeam near the column, which not only prevents the end of the fourth carbon fiber cloth from peeling off, but also effectively bears the tensile and shear stress at the node, improves the targeting and reliability of the node reinforcement, and ensures the long-term stability and reliability of the reinforced structure.

[0016] 2. This invention extends the fourth carbon fiber cloth to the surface of the third carbon fiber cloth to form an overlapping connection area. Combined with the mechanical fixing effect of the reinforcing member pressing and the expansion bolt, it replaces the single adhesive fixing, thereby avoiding the end of the fourth carbon fiber cloth from lifting and peeling, strengthening the connection strength of the cloth layers, improving the synergistic stress-bearing capacity between the cloth layers, and ensuring the smooth transfer of load between beams, columns and nodes. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the carbon fiber cloth bonding structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the reinforcing member of the present invention.

[0021] The markings in the attached diagram are as follows: 1. Column; 2. Horizontal beam; 3. First carbon fiber cloth; 4. Second carbon fiber cloth; 5. Third carbon fiber cloth; 6. Fourth carbon fiber cloth; 7. Reinforcing member; 8. First bolt; 701. Rectangular plate; 702. Bending part; 703. Reinforcing plate; 704. First through hole; 705. Second through hole; 706. Blind hole; 707. Expansion bolt. Detailed Implementation

[0022] This specific embodiment is a carbon fiber reinforced concrete beam-column strengthening component, and its structural schematic diagram is shown below. Figures 1-4 As shown, the reinforcing member includes a column 1 and a crossbeam 2 fixedly connected to the column 1. The crossbeam 2 is smaller than the cross-sectional area of ​​the column 1. A first carbon fiber cloth 3 is bonded and fixed along the length direction on both the upper and lower sides of the crossbeam 2. A second carbon fiber cloth 4 is bonded and fixed to the outer surface of the crossbeam 2 and the first carbon fiber cloth 3. A third carbon fiber cloth 5 is bonded and fixed to the outer surface of both the upper and lower ends of the column 1. A fourth carbon fiber cloth 6 is bonded and fixed to the front and rear sides of the column 1 at the connection point of the crossbeam 2. Both ends of the fourth carbon fiber cloth 6 extend to the second carbon fiber cloth 4 of the crossbeam 2. Two reinforcing members 7 are provided at one end of the crossbeam 2 near the column 1. The two reinforcing members 7 are connected and fixed by a first bolt 8 and are used to press against the end of the fourth carbon fiber cloth 6.

[0023] like Figure 1 and Figure 3 As shown: In this embodiment, the second carbon fiber cloth 4 and the third carbon fiber cloth 5 are both U-shaped cloth hoop structures that are wound and fixed, and the fourth carbon fiber cloth 6 is a U-shaped cloth hoop structure. There are multiple cloth hoop structures for the second carbon fiber cloth 4, the third carbon fiber cloth 5, and the fourth carbon fiber cloth 6. The width of the cloth hoops for the second carbon fiber cloth 4, the third carbon fiber cloth 5, and the fourth carbon fiber cloth 6 is 120-200mm, and the overlap length of the cloth hoop is ≥150mm. The overlap length of adjacent cloth hoops is ≥20mm, so that the fiber cloth is tightly wrapped around the surface of the column 1 and the beam 2. The interface of the third carbon fiber cloth 5 is placed on the left or right side and can be pressed by the reinforcing member 7.

[0024] In this embodiment, the first carbon fiber cloth 3, the second carbon fiber cloth 4, the third carbon fiber cloth 5, and the second carbon fiber cloth 4 are all bonded and fixed with epoxy resin-based adhesive. Nano-silica powder is added inside the epoxy resin-based adhesive. The nano-silica powder can fill the tiny pores inside the adhesive and at the interface, improve the density and mechanical properties of the adhesive. Compared with ordinary epoxy resin adhesive, the bonding strength is increased by more than 20%, and the interface wettability is better. It can achieve seamless bonding between the carbon fiber cloth and the concrete and between each cloth layer, further enhance the reinforcement effect, and extend the service life of the component.

[0025] like Figure 1 and Figure 4 As shown: In this embodiment, the reinforcing member 7 includes a rectangular plate 701 with a groove. Both ends of the rectangular plate 701 are integrally formed with bent portions 702. A right-angled triangular reinforcing plate 703 is welded and fixed between the bent portions 702 and the rectangular plate 701. The groove of the rectangular plate 701 is fitted onto the crossbeam 2, and the reinforcing plate 703 is attached to the side of the column 1. A first through hole 704 is opened on the bent portion 702, and a first bolt 8 is inserted into the front and rear first through holes 704. The specific dimensions of the reinforcing member 7 should be determined according to the beam-column connection. The width of the groove of the rectangular plate 701 should correspond to the end of the fourth carbon fiber cloth 6 and be used to cover the end of the fourth carbon fiber cloth 6. The height of the groove of the rectangular plate 701 should correspond to the height of the crossbeam 2 and the thickness of the first carbon fiber cloth 3 and the second carbon fiber cloth 4.

[0026] like Figure 2 and Figure 4 As shown: In this embodiment, a second through hole 705 is provided on the reinforcing plate 703, and blind holes 706 corresponding to the second through hole 705 are provided on both the left and right sides of the column 1. Expansion bolts 707 are inserted into the second through hole 705 and the blind holes 706. The drilling depth of the blind holes 706 is controllable, and the small number will not cause secondary damage to the original concrete beam 2 and column 1. Moreover, no complicated equipment is required, which can effectively shorten the construction cycle, reduce the construction cost, and adapt to the beam-column joint reinforcement needs under different working conditions.

[0027] Working principle: The surfaces of the beam 2 and column 1 that need to be covered with carbon fiber cloth are sanded and the corners are chamfered. Then, the base epoxy resin is evenly applied to the surface of the beam 2 and column 1 with a brush. After the application is completed, the cut first carbon fiber cloth 3 and third carbon fiber cloth 5 are pasted onto the surface of the beam 2 and column 1 respectively within a specified time. Then, the second carbon fiber cloth 4 is wrapped and pasted onto the outer surface of the beam 2 and the first carbon fiber cloth 3. Next, the fourth carbon fiber cloth 6 is pasted at the connection between the column 1 and the beam 2. When pasting, the fourth carbon fiber cloth 6 is bent and pasted to the left and right sides of the column 1, and both ends extend to the second carbon fiber cloth 4 of the beam 2 for pasting and fixing. When pasting, air bubbles should be squeezed out along the direction of force of the carbon fiber cloth to make the carbon fiber cloth adhere tightly. Then, the reinforcing member 7 is clipped to the front and rear sides of the beam 2 near the end of the column 1 and is pressed against the side of the column 1 in contact with the fourth carbon fiber cloth 6. Then, it is connected and fixed by the first bolt 8 to constrain the connection between the beam 2 and the column 1.

[0028] All technical features in this embodiment can be freely combined according to actual needs.

[0029] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

Claims

1. A carbon fiber reinforced concrete beam-column reinforcement member, the reinforcement member comprising a column (1) and a crossbeam (2) fixedly connected to the column (1), characterized in that: The crossbeam (2) is smaller than the cross-sectional area of ​​the column (1). The upper and lower sides of the crossbeam (2) are bonded with a first carbon fiber cloth (3) along the length direction. The outer surfaces of the crossbeam (2) and the first carbon fiber cloth (3) are bonded with a second carbon fiber cloth (4). The outer surfaces of the upper and lower ends of the column (1) are bonded with a third carbon fiber cloth (5). The front and rear sides of the column (1) and the connection point of the crossbeam (2) are bonded with a fourth carbon fiber cloth (6). Both ends of the fourth carbon fiber cloth (6) extend to the second carbon fiber cloth (4) of the crossbeam (2). The end of the crossbeam (2) near the column (1) is provided with two reinforcing members (7). The two reinforcing members (7) are connected and fixed by a first bolt (8) and used to press on the end of the fourth carbon fiber cloth (6).

2. The carbon fiber reinforced concrete beam-column strengthening member according to claim 1, characterized in that, The second carbon fiber cloth (4) and the third carbon fiber cloth (5) are both U-shaped cloth hoop structures that are wound and fixed, and the fourth carbon fiber cloth (6) is a U-shaped cloth hoop structure. The number of cloth hoop structures of the second carbon fiber cloth (4), the third carbon fiber cloth (5) and the fourth carbon fiber cloth (6) are all multiple.

3. The carbon fiber reinforced concrete beam-column strengthening member according to claim 2, characterized in that, The width of the hoop of the second carbon fiber cloth (4), the third carbon fiber cloth (5) and the fourth carbon fiber cloth (6) is 120-200mm, and the overlap length of the hoop is ≥150mm.

4. The carbon fiber reinforced concrete beam-column strengthening member according to claim 3, characterized in that, The first carbon fiber cloth (3), the second carbon fiber cloth (4), the third carbon fiber cloth (5), and the second carbon fiber cloth (4) are all bonded and fixed with epoxy resin-based adhesive, and nano-silica powder is added inside the epoxy resin-based adhesive.

5. The carbon fiber reinforced concrete beam-column strengthening member according to claim 1, characterized in that, The reinforcing member (7) includes a rectangular plate (701) with a groove. Both ends of the rectangular plate (701) are integrally formed with bent portions (702). A right-angled triangular reinforcing plate (703) is welded and fixed between the bent portions (702) and the rectangular plate (701). The groove of the rectangular plate (701) is fitted onto the crossbeam (2), and the reinforcing plate (703) is attached to the side of the column (1).

6. The carbon fiber reinforced concrete beam-column strengthening member according to claim 5, characterized in that, The bent portion (702) has a first through hole (704), and the first bolt (8) passes through the two first through holes (704).

7. The carbon fiber reinforced concrete beam-column strengthening member according to claim 6, characterized in that, The reinforcing plate (703) has a second through hole (705), and the left and right sides of the column (1) have blind holes (706) corresponding to the second through hole (705). Expansion bolts (707) are inserted into the second through hole (705) and the blind holes (706).

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