A concrete shear wall structure with ECC-reinforced composite mesh reinforcement

Abstract

This invention discloses a concrete shear wall structure with ECC-reinforced composite mesh reinforcement, comprising ordinary concrete, ECC material, steel bars, carbon fiber reinforcement, and carbon fiber mesh reinforcement. ECC is an engineering cement-based composite material, using cement slurry or cement mortar as the matrix material and fiber as the reinforcing material. The ECC material is formed in the concealed column areas on both sides of the shear wall. The carbon fiber reinforcement is a carbon fiber-reinforced composite material, vertically arranged in the concealed column areas. The carbon fiber mesh reinforcement is a mesh shape, horizontally arranged in the shear wall, and can replace horizontal steel bars, stirrups, and tie bars. The joints of the carbon fiber mesh reinforcement are bonded with epoxy resin. This invention utilizes the high ductility of ECC material and the lightweight and high strength of carbon fiber material to improve the deformation capacity of the concrete shear wall and reduce residual deformation, exhibiting excellent seismic performance.

Description

Technical Field

[0001] This invention belongs to the field of high-rise structure technology and is a concrete shear wall structure with ECC (engineering cement-based composite material) reinforced composite mesh reinforcement. Background Technology

[0002] Shear walls, as the main lateral force-resisting components of high-rise buildings, are the core of their earthquake resistance. Traditional reinforced concrete shear walls dissipate the energy input by earthquakes through structural damage. When subjected to moderate to large earthquakes, the structure is prone to varying degrees of damage, such as concrete cracking and spalling, and steel bar buckling, resulting in significant residual deformation. These damages reduce the seismic performance of the shear walls, increase the difficulty of post-earthquake repair, and raise maintenance costs.

[0003] ECC materials exhibit multi-steady-state cracking characteristics and possess excellent deformation capacity, effectively addressing the shortcomings of traditional concrete in terms of brittleness and tensile properties. Related studies have shown that ECC can improve the load-bearing capacity, ductility, and durability of structural members. ECC materials are generally used in critical structural locations, such as beam-column joints. ECC can fully utilize the mechanical properties of reinforcement materials in a structure.

[0004] Carbon fiber reinforced polymer (CFRP) mesh is lightweight, high-strength, and corrosion-resistant. Its mesh design offers good integrity and anchoring performance, and the mesh size and number of fiber layers can be customized to meet specific requirements. Placing CFRP reinforcement in shear walls can effectively inhibit crack propagation.

[0005] The concealed column area is a critical part of the shear wall, and it suffers severe damage during earthquakes. This invention places ECC material at the concealed column location in the shear wall, which can fully utilize the mechanical properties of carbon fiber and improve the overall deformation capacity of the shear wall. Simultaneously, this invention, combined with carbon fiber, can control the propagation of structural cracks and residual deformation. Summary of the Invention

[0006] Technical Problem: In order to overcome the shortcomings of the existing technology, the present invention provides a concrete shear wall structure with ECC reinforced composite mesh reinforcement, which can improve the deformation capacity of concrete shear walls and reduce residual deformation of the structure, give full play to the mechanical properties of carbon fiber materials in shear walls, and has good seismic performance.

[0007] Technical Solution: To achieve the above objectives, the present invention provides a concrete shear wall structure with ECC-reinforced composite mesh reinforcement, comprising concrete, ECC material, steel bars 5, carbon fiber bars 4, and carbon fiber mesh reinforcement 3. The carbon fiber bars 4 are vertically arranged in the ECC concealed column areas 2 on both sides of the shear wall 9, the steel bars 5 are vertically arranged in the non-concealed column area in the middle of the shear wall 9, and the carbon fiber mesh reinforcement 3 is horizontally arranged in the shear wall 9, perpendicular to the carbon fiber bars 4 and steel bars 5, and bound with steel wire to form the internal skeleton of the shear wall. The ECC material is poured into the concealed column areas on both sides of the shear wall 9 to form the ECC concealed column areas 2, and concrete is poured in the remaining areas of the shear wall 9, thus constituting the concrete shear wall with ECC-reinforced composite mesh reinforcement.

[0008] The ECC material is made of high-ductility concrete, which has better ultimate compressive and tensile deformation capacity than ordinary concrete. In addition, the fibers used in ECC are synthetic fibers, and the ECC material exhibits strain hardening under tension.

[0009] The carbon fiber reinforcement is made of lightweight and high-strength carbon fiber reinforced composite material, which is more than twice as strong as ordinary steel bars. Its surface is rough, which can have good interlocking force with concrete. When it is placed in the hidden column area of ​​the shear wall, the carbon fiber reinforcement has a good anchoring effect on the concrete when the shear wall is subjected to horizontal loads such as earthquakes, effectively inhibiting the development of cracks.

[0010] The carbon fiber mesh reinforcement is made of mesh-shaped carbon fiber reinforced composite reinforcement. The single-limb carbon fiber mesh reinforcement is a sheet-like reinforcement bonded with epoxy resin. Its tensile strength is usually more than twice that of ordinary steel bars. The carbon fiber mesh reinforcement is horizontally arranged in the shear wall, replacing the horizontally distributed steel bars, stirrups and tie bars of the traditional concrete shear wall, which improves construction efficiency. The mesh reinforcement is connected to the vertical steel bars by steel wire binding.

[0011] The reinforcing steel is ribbed, which has good working performance with concrete.

[0012] The superstructure is a beam and slab structure, and the vertically arranged carbon fiber reinforcement and steel bars in the shear wall need to extend to the superstructure.

[0013] The substructure consists of beams, slabs, etc., and the vertically arranged carbon fiber reinforcement and steel bars in the shear wall need to extend to the substructure.

[0014] The ECC concealed column area is a weak point of the shear wall. ECC material is uniformly poured into the concealed column area, and the range of the ECC concealed column is greater than 100mm. By arranging ECC material, the deformation capacity of the shear wall can be effectively improved.

[0015] The carbon fiber mesh reinforcement is made of bidirectional multilayer continuous carbon fiber impregnated with epoxy resin, and the carbon fiber mesh reinforcement is arranged horizontally in the shear wall.

[0016] The longitudinal reinforcement of the shear wall extends into the superstructure and substructure, and the interval between the pouring of the ECC in the shear wall and the ordinary concrete material should be controlled within 48 hours.

[0017] Carbon fiber mesh reinforcement is lightweight and high-strength. When placed in concrete, its good synergy with the concrete can effectively inhibit the development of cracks in shear walls under horizontal loads. The carbon fiber reinforcement and carbon fiber mesh reinforcement arranged in the shear wall form a skeleton with good bending and shear resistance, effectively controlling the residual deformation of the shear wall.

[0018] The simultaneous arrangement of ECC material and carbon fiber material in the shear wall structure can effectively improve the problem of premature failure of ordinary concrete due to insufficient ultimate deformation capacity. At the same time, it can give full play to the mechanical properties of steel bars and carbon fiber reinforcement, improve the deformation capacity of concrete shear walls and reduce residual deformation, thus exhibiting good seismic performance.

[0019] Beneficial effects: The carbon fiber mesh reinforcement has corrosion resistance, improving structural durability. The lightweight and high-strength characteristics of the carbon fiber mesh reinforcement effectively suppress the width of concrete cracks. When arranged in shear walls, the carbon fiber reinforcement and carbon fiber mesh reinforcement exhibit excellent bending and shear resistance, effectively controlling residual deformation of the structure.

[0020] Furthermore, the ECC material is disposed in the concealed column area of ​​the shear wall. Since the concealed column is the part of the shear wall that is most critically stressed and subjected to the greatest strain during an earthquake, applying this material with excellent deformation performance to this area can effectively improve the problem of premature failure of ordinary concrete due to insufficient deformation capacity. At the same time, it can give full play to the mechanical properties of steel bars and carbon fiber reinforcement, enhance the overall deformation performance of the shear wall, and have good seismic performance. Attached Figure Description

[0021] Figure 1 This is an elevation view of the shear wall of the present invention;

[0022] Figure 2 This is a reinforcement diagram of the cross-section of the shear wall AA according to the present invention;

[0023] Figure 3 This is a schematic diagram of the carbon fiber mesh reinforcement node of the present invention;

[0024] Figure 4 This is a stress diagram of different parts of the ECC-reinforced composite mesh reinforced concrete shear wall under repeated horizontal loading according to the present invention.

[0025] in Figure 4 (a) in the diagram shows the location of the concrete measuring points. Figure 4 (b) in the diagram represents the stress diagram at each measuring point under the limit state.

[0026] The structure includes: 1. Superstructure, 2. ECC concealed column area, 3. Carbon fiber mesh reinforcement, 4. Carbon fiber reinforcement, 5. Reinforcing steel, 6. Substructure, 7. Carbon fiber, 8. Epoxy resin, 9. Shear wall. Detailed Implementation

[0027] This invention relates to a concrete shear wall structure reinforced with ECC-enhanced composite mesh reinforcement. The invention comprises ordinary concrete, ECC material, reinforcing steel bars, carbon fiber reinforcement, and carbon fiber mesh reinforcement. The ECC material is placed in the concealed column areas on both sides of the shear wall. The carbon fiber reinforcement is vertically arranged in the concealed column areas. The carbon fiber mesh reinforcement is horizontally arranged, allowing for the replacement of horizontal reinforcing steel bars, stirrups, and tie bars. This invention utilizes the high ductility of ECC material and the lightweight and high strength of carbon fiber material to suppress the propagation of concrete cracks in the shear wall, reduce residual deformation of the structure, and improve the seismic performance of the shear wall. The invention will be further described below with reference to the accompanying drawings.

[0028] like Figure 1 , Figure 2 As shown, the ECC-reinforced composite mesh reinforced concrete shear wall structure is located below the upper structure 1 and above the lower structure 6. The upper structure 1 is a beam-slab structure, and the vertically arranged carbon fiber reinforcement 4 and steel reinforcement 5 in the shear wall need to extend to the upper structure. The lower structure 6 is a beam-slab structure, and the vertically arranged carbon fiber reinforcement 4 and steel reinforcement 5 in the shear wall need to extend to the lower structure. The concrete shear wall structure includes concrete, ECC material, steel reinforcement 5, carbon fiber reinforcement 4, and carbon fiber mesh reinforcement 3. The carbon fiber reinforcement 4 is vertically arranged in the ECC concealed column area 2 on both sides of the shear wall 9, the steel reinforcement 5 is vertically arranged in the non-concealed column area in the middle of the shear wall 9, and the carbon fiber mesh reinforcement 3 is horizontally arranged in the shear wall 9, perpendicular to the carbon fiber reinforcement 4 and steel reinforcement 5, and tied with steel wire to form the internal skeleton of the shear wall. The ECC material is poured in the concealed column area on both sides of the shear wall 9 to form the ECC concealed column area 2, and the remaining positions of the shear wall 9 are filled with concrete; thus constituting the ECC-reinforced composite mesh reinforced concrete shear wall structure. The carbon fiber reinforcement is lightweight and high-strength. When the shear wall is subjected to horizontal loads such as earthquakes, the carbon fiber reinforcement in the concealed column area can effectively inhibit the development of cracks.

[0029] The ECC material is made of high-ductility concrete, which has better ultimate compressive and tensile deformation capacity than ordinary concrete. In addition, the fibers used in ECC are synthetic fibers, and the ECC material exhibits strain hardening under tension.

[0030] The carbon fiber reinforcement 4 is made of lightweight and high-strength carbon fiber reinforced composite material, which is more than twice as strong as ordinary steel bars. Its surface is rough, which can have good interlocking force with concrete. When it is placed in the hidden column area of ​​the shear wall, the carbon fiber reinforcement has a good anchoring effect on the concrete when the shear wall is subjected to horizontal loads such as earthquakes, effectively inhibiting the development of cracks.

[0031] The carbon fiber mesh reinforcement 3 is made of mesh-shaped carbon fiber reinforced composite reinforcement. The single-limb carbon fiber mesh reinforcement is a sheet-like reinforcement, which is bonded together with epoxy resin. Its tensile strength is usually more than twice that of ordinary steel bars. The carbon fiber mesh reinforcement 3 is arranged horizontally in the shear wall, replacing the horizontally distributed steel bars, stirrups and tie bars of the traditional concrete shear wall, which improves construction efficiency. The mesh reinforcement and the vertical steel bars are connected by steel wire binding.

[0032] 5. Ribbed steel bars are selected for reinforcement, which have good working performance with concrete.

[0033] ECC concealed column area 2 is a weak point of the shear wall. ECC material is uniformly poured into the concealed column area, and the range of the ECC concealed column is greater than 100mm. By arranging ECC material, the deformation capacity of the shear wall can be effectively improved.

[0034] The longitudinal reinforcement of shear wall 9 extends into the superstructure and substructure, and the interval between the pouring of ECC and ordinary concrete in the shear wall should be controlled within 48 hours.

[0035] like Figure 3 The carbon fiber mesh reinforcement 3 is made of bidirectional multilayer continuous carbon fiber 7 impregnated with epoxy resin 8, and the longitudinal and transverse reinforcements as well as the mesh intersections all possess a certain strength. The carbon fiber mesh reinforcement is horizontally arranged in the shear wall, replacing the horizontally distributed reinforcing bars, stirrups, and tie bars. The carbon fiber mesh reinforcement is connected to the vertical reinforcing bars by steel wire binding. The arrangement of the carbon fiber reinforcement and the carbon fiber mesh reinforcement in the shear wall provides excellent bending and shear resistance, effectively controlling residual deformation of the structure.

[0036] like Figure 4 A numerical model of a shear wall was established using ABAQUS finite element software. Numerical simulations of horizontal low-cycle cyclic loads were performed on an ECC-reinforced composite mesh reinforced concrete shear wall. Compared to ordinary concrete shear walls, the failure at the bottom of the hidden column area in the ECC-reinforced composite mesh reinforced concrete shear wall was delayed. Figure 4 As shown, the stress at the bottom AG measuring point of the ECC-reinforced composite mesh reinforced concrete shear wall under the ultimate state is extracted. A and G are located at the bottom of the ECC hidden column area, and BF is located at the bottom of the concrete web. It can be found that the concrete stress at the bottom of the web is greater than that in the hidden column area. Therefore, the reasonable configuration of ECC material and carbon fiber mesh reinforcement can reduce the premature failure and spalling caused by insufficient ductility of ordinary concrete, and also improve the utilization rate of carbon fiber mesh reinforcement, thus promoting the performance of the two high-performance materials.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A concrete shear wall structure with ECC-reinforced composite mesh reinforcement, characterized in that, The shear wall comprises concrete, ECC material, steel bars (5), carbon fiber bars (4), and carbon fiber mesh bars (3); the carbon fiber bars (4) are vertically arranged in the ECC hidden column area (2) on both sides of the shear wall (9), the steel bars (5) are vertically arranged in the non-hidden column area in the middle of the shear wall (9), and the carbon fiber mesh bars (3) are horizontally arranged in the shear wall (9) perpendicular to the carbon fiber bars (4) and the steel bars (5) and tied with steel wire to form the internal skeleton of the shear wall; the ECC material is poured in the hidden column area on both sides of the shear wall (9) to form the ECC hidden column area (2), and the remaining positions of the shear wall (9) are filled with concrete; the concrete shear wall structure consisting of ECC reinforced composite mesh bars is formed; the carbon fiber mesh bars (3) are made by impregnating bidirectional multilayer continuous carbon fibers (7) with epoxy resin (8), and the carbon fiber mesh bars (3) are horizontally arranged in the shear wall.

2. The concrete shear wall structure with ECC-reinforced composite mesh reinforcement according to claim 1, characterized in that, The ECC material is high-ductility concrete, and the fibers used in the ECC are synthetic fibers. The ECC material exhibits strain hardening when subjected to tension.

3. A concrete shear wall structure with ECC-reinforced composite mesh reinforcement according to claim 1, characterized in that, The carbon fiber reinforcement (4) is made of lightweight and high-strength carbon fiber reinforced composite material.

4. A concrete shear wall structure with ECC-reinforced composite mesh reinforcement according to claim 1, characterized in that, (5) Ribbed steel bars shall be selected for reinforcing bars.

5. A concrete shear wall structure with ECC-reinforced composite mesh reinforcement according to claim 1, characterized in that, The superstructure (1) is a beam and slab structure, and the vertically arranged carbon fiber reinforcement (4) and steel reinforcement (5) in the shear wall need to extend to the superstructure.

6. A concrete shear wall structure with ECC-reinforced composite mesh reinforcement according to claim 1, characterized in that, The lower structure (6) is a beam and slab structure, and the vertically arranged carbon fiber reinforcement (4) and steel reinforcement (5) in the shear wall need to extend to the lower structure.

7. A concrete shear wall structure with ECC-reinforced composite mesh reinforcement according to claim 1, characterized in that, The ECC concealed column area (2) is a weak point of the shear wall. ECC material is uniformly poured into the concealed column area, and the range of the ECC concealed column is greater than 100mm.

8. A concrete shear wall structure with ECC-reinforced composite mesh reinforcement according to claim 1, characterized in that, The longitudinal reinforcement of the shear wall (9) extends into the superstructure and substructure, and the interval between the ECC and ordinary concrete material in the shear wall should be controlled within 48 hours.

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