A low yield point steel shear panel damper reinforced with CFRP material
By bonding a CFRP material layer to the shear plate and designing weakening holes at the connection plate, the problem of buckling instability of traditional steel plate shear dampers under repeated loading is solved, improving buckling resistance and fatigue resistance while reducing self-weight.
Patent Information
- Application Number
- CN202521272000.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-06-20
AI Technical Summary
Traditional steel plate shear dampers are prone to fatigue damage and load-bearing capacity degradation under repeated cyclic loading, and existing improvement schemes increase their own weight and weaken their deformation capacity.
The low yield point steel shear plate damper reinforced with CFRP material creates a restraint effect by bonding a CFRP material layer to the shear plate, thereby improving buckling resistance. Weakening holes are designed at the connection plate to preferentially yield and dissipate energy.
It effectively increases the buckling critical load of the shear plate by more than 50%, delays crack propagation, enhances fatigue resistance, reduces self-weight, and protects the main structure from catastrophic damage.
Smart Images
Figure CN224943535U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of seismic-resistant building components, specifically a low-yield-point steel shear plate damper reinforced with CFRP material. Background Technology
[0002] With increasingly stringent seismic requirements for building structures, traditional steel plate shear dampers are prone to fatigue damage and load-bearing capacity degradation under long-term cyclic loading. The main reasons are as follows: Traditional shear plate dampers, as key components in seismic resistance, typically use low-yield-point steel (LYP) as their core material. LYP leverages its low yield strength (100–160 MPa), high ductility, and stable hysteretic energy dissipation characteristics to achieve efficient seismic energy absorption. However, under repeated cyclic loading, LYP steel plates are prone to out-of-plane buckling instability, leading to a sharp drop in load-bearing capacity and a shortened fatigue life (typical failure displacement angle is only 0.02–0.03°). To address the aforementioned issues, existing technologies primarily employ methods such as adding stiffening ribs or filling with concrete. While these methods can suppress buckling, they also have significant drawbacks, including a substantial increase in self-weight (approximately 40%) and a reduction in deformation capacity. To avoid these problems, existing steel plate shear dampers need to be improved. Carbon fiber reinforced polymer (CFRP) offers a novel approach to improving the mechanical properties of dampers due to its superior properties, including high strength, corrosion resistance, and fatigue resistance. Utility Model Content
[0003] The purpose of this invention is to provide a low yield point steel shear plate damper reinforced with CFRP material, which solves the problem that the steel plate of the existing steel plate shear damper has weak buckling resistance and is prone to buckling instability under repeated cyclic loading.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A low yield point steel shear plate damper reinforced with CFRP material includes a connecting plate and a shear plate. Two connecting plates are horizontally fixed to the top and bottom of the shear plate, respectively. The shear plate and connecting plates are perpendicular to each other. The shear plate is positioned along the line connecting the midpoints of the two short sides of the connecting plate. The shear plate is characterized by having flange plates fixed to both sides of the shear plate. The top surface of the flange plate is connected to the bottom surface of the connecting plate at the top of the shear plate, and the bottom surface of the flange plate is connected to the top surface of the connecting plate at the bottom of the shear plate. The flange plates are perpendicular to both the shear plate and the connecting plate. At least one of the two surfaces of the shear plate is bonded with a layer of CFRP material.
[0005] The shear plate here is made of LY225 steel, and the flange plate is made of Q235 steel. Carbon fiber reinforced polymer (CFRP) provides a solution for upgrading the performance of dampers due to its ultra-high strength (>3000 MPa), lightweight (density 1.6 g / cm³) and fatigue resistance. In this solution, a CFRP material layer is used and bonded to one side of the shear plate to form a constraint effect, which effectively improves the buckling resistance of the shear plate, increases its buckling critical load by more than 50%, and delays crack propagation.
[0006] As a further preferred embodiment of this utility model, the connecting plate has a plurality of through-holes along the vertical direction.
[0007] As a further preferred embodiment of this utility model, there are a total of eight screw holes in the plate body, of which three are left-side screw holes, which are evenly spaced along the left screw hole layout line parallel to the left side of the connecting plate, and the left-side screw holes are located on the outer side of the left flange plate. Three of the screw holes are right-side screw holes, which are evenly spaced along the right screw hole layout line parallel to the right side of the connecting plate, and the right-side screw holes are located on the outer side of the right flange plate. The remaining two are middle screw holes, which are located between the left-side and right-side screw holes, and the two middle screw holes are symmetrically arranged with the shear plate as the symmetrical face.
[0008] As a further preferred embodiment of this utility model, the length, width, and thickness of the connecting plate are 50cm, 18cm, and 3cm, respectively; the length, height, and thickness of the shearing plate are 26cm, 47cm, and 0.8cm, respectively; and the length, height, and thickness of the flange plate are 14cm, 47cm, and 1.2cm, respectively. When only one side of the shearing plate is bonded and covered with a CFRP material layer, the thickness of the CFRP material layer is 0.115cm. When both sides of the shearing plate are bonded and covered with a CFRP material layer, the thickness of the CFRP material layer on one side is 0.05cm.
[0009] When only one of the two sides of the shear plate is bonded and covered with a CFRP material layer, out-of-plane bending deformation will be induced due to the non-symmetrical structure, which will weaken the buckling resistance. Therefore, the CFRP material layer needs to be designed to be thicker here. When both sides of the shear plate are bonded and covered with CFRP material layers, it becomes a symmetrical structure. Such a symmetrical structure can eliminate or significantly reduce the out-of-plane bending effect, making the cross-section stress closer to the ideal pure shear state, the stress distribution is more uniform, and the buckling resistance of CFRP can be fully utilized. Therefore, it can be designed to be thinner here.
[0010] As a further preferred embodiment of this invention, both sides of the shear plate are bonded with CFRP material layers.
[0011] Fiberglass reinforced polymer (CFRP) layers symmetrically bonded to both sides of a shear plate can eliminate or significantly reduce out-of-plane bending effects, making the cross-section more closely resemble the ideal pure shear state, resulting in a more uniform stress distribution and allowing CFRP to more fully exert its buckling resistance.
[0012] As a further preferred embodiment of this utility model, the connecting plate and the shearing plate are provided with a shearing plate connecting groove adapted to the shearing plate, the bottom surface of the connecting plate located at the top of the shearing plate is provided with an anti-detachment anchoring structure on the CFRP material layer, and the top surface of the connecting plate located at the bottom of the shearing plate is provided with an anti-detachment anchoring structure on the bottom of the CFRP material layer.
[0013] The bonding interface between CFRP and the shear plate is one of the weakest links in the entire structure, especially at the edge of the shear plate, where high shear stress and peel stress exist, which can seriously affect the stability of the bonding interface. The shear plate connection groove can firstly provide a certain degree of binding and anchoring for the end of the CFRP material layer, and secondly, protect the weld between the shear plate and the connecting plate. The anti-detachment anchoring structure on the upper and lower parts of the CFRP material layer can further bind and anchor the edge parts of the CFRP material layer, providing mechanical interlocking for the edge parts of the CFRP material layer and reducing the probability of peeling and propagation at the edge of the CFRP material layer.
[0014] As a further preferred embodiment of this utility model, the anti-detachment anchoring structure on the CFRP material layer includes two upper fixing plates and two upper pressure plates. The two upper fixing plates are symmetrically fixed in front of and behind the shear plate with the shear plate as the plane of symmetry. The upper fixing plates are arranged parallel to the shear plate. At least two upper fixing plate bolt through holes are opened in the middle of the plate body of the upper fixing plates. The direction of the upper fixing plate bolt through holes is perpendicular to the shear plate. Upper clamping bolts are threaded to the upper fixing plate bolt through holes. The inner side of the upper clamping bolt passes through the upper fixing plate bolt through holes and is connected to the upper clamping bolts arranged between the upper fixing plates and the shear plate. The CFRP material layer is connected by a rotating pressure plate. The anti-detachment anchoring structure includes two lower fixing plates and two lower pressure plates. The two lower fixing plates are symmetrically fixed in front of and behind the shear plate with the shear plate as the plane of symmetry. The lower fixing plates are arranged parallel to the shear plate. At least two lower fixing plate bolt through holes are opened in the middle of the plate body. The direction of the lower fixing plate bolt through holes is perpendicular to the shear plate. The lower fixing plate bolt through holes is threaded with a lower clamping bolt. The inner side of the lower clamping bolt passes through the lower fixing plate bolt through hole and is rotatably connected to the lower pressure plate arranged between the lower fixing plate and the shear plate.
[0015] Tightening the upper clamping bolt will push the upper pressure plate against the CFRP material layer, and tightening the lower clamping bolt will push the lower pressure plate against the CFRP material layer. Once the upper and lower pressure plates are in place, they will limit and anchor the edge of the CFRP material layer, effectively reducing the probability of peeling and expansion at the edge of the CFRP material layer. The upper pressure plate is inverted "U" shaped, and the lower pressure plate is "U" shaped. When both are in place, they can completely cover the edge of the CFRP material layer.
[0016] As a further preferred embodiment of this invention, the surface of the CFRP material layer is further coated with a fire-retardant coating layer.
[0017] The resin matrix of CFRP softens and decomposes at high temperatures, losing its load-bearing capacity for the fibers and reducing or even eliminating its reinforcing effect. Therefore, a fire-retardant coating layer is added to the surface of the CFRP material layer.
[0018] As a further preferred embodiment of this utility model, at least one connecting plate weakening hole is also provided in the middle of the connecting plate.
[0019] The weakening hole in the connecting plate is a relatively minor and easily replaceable part outside the main body of the damper (i.e., the CFRP-steel composite shear plate). It is an artificially designed, controllable weak link. This weak link is designed to preferentially yield and undergo plastic deformation before the CFRP may experience brittle failure (peeling or fracture), thereby dissipating seismic energy and protecting the main structure (especially the expensive CFRP-reinforced area) from catastrophic brittle failure. The specific principle is that stress concentration forms at the edge of the weakening hole in the connecting plate, causing the area to yield first and develop plastic deformation, forming an energy-dissipating plastic hinge. When making the weakening hole in the connecting plate, the starting load of the brittle failure mode (interface peeling, CFRP fracture) of the CFRP-reinforced shear plate is first determined. Then, the design yield load of the connecting plate should meet the following condition: the design yield load of the damper core shear plate < the design yield load of the connecting plate < the starting load of the brittle failure mode (interface peeling, CFRP fracture) of the CFRP-reinforced shear plate * 0.8. This ensures that the core yields first and dissipates energy.
[0020] As a further preferred embodiment of this utility model, the hole shape of the weakening hole in the connecting plate is an oblong hole.
[0021] The stress concentration factor of an oblong hole is lower than that of a round hole, resulting in better plastic development.
[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. The shear plate here is made of LY225 steel, and the flange plate is made of Q235 steel. Carbon fiber reinforced composite material (CFRP) provides a solution for upgrading the performance of dampers due to its ultra-high strength (>3000 MPa), lightweight (density 1.6 g / cm³) and fatigue resistance. In this solution, a CFRP material layer is used and bonded to one side of the shear plate to form a constraint effect, which effectively improves the buckling resistance of the shear plate, increases its buckling critical load by more than 50%, and delays crack propagation.
[0023] 2. When only one of the two sides of the shear plate is bonded and covered with a CFRP material layer, out-of-plane bending deformation will be induced due to the non-symmetrical structure, which will weaken the buckling resistance. Therefore, the CFRP material layer needs to be designed to be thicker here. When both sides of the shear plate are bonded and covered with CFRP material layers, it becomes a symmetrical structure. Such a symmetrical structure can eliminate or significantly reduce the out-of-plane bending effect, making the cross-section stress closer to the ideal pure shear state, the stress distribution is more uniform, and the buckling resistance of CFRP can be fully utilized. Therefore, it can be designed to be thinner here.
[0024] 3. Fiberglass reinforced plastic (CFRP) layers can be symmetrically bonded to both sides of the shear plate to eliminate or significantly reduce out-of-plane bending effects, making the cross-section more closely resemble the ideal pure shear state, with a more uniform stress distribution, and thus more fully utilizing the buckling resistance of CFRP.
[0025] 4. The bonding interface between CFRP and the shear plate is one of the weakest links in the entire structure, especially at the edge of the shear plate, where high shear stress and peel stress exist, which will seriously affect the stability of the bonding interface. The shear plate connection groove can firstly provide a certain binding and anchoring effect on the end of the CFRP material layer, and secondly, protect the weld between the shear plate and the connecting plate. The anti-detachment anchoring structure on the upper and lower parts of the CFRP material layer can further bind and anchor the edge parts of the CFRP material layer, providing mechanical interlocking for the edge parts of the CFRP material layer and reducing the probability of peeling and expansion at the edge of the CFRP material layer.
[0026] 5. The resin matrix of CFRP will soften and decompose at high temperatures, losing its load-bearing capacity for the fibers and reducing or even losing its reinforcing effect. Therefore, a fire-retardant coating layer is added to the surface of the CFRP material layer.
[0027] 6. The weakening hole in the connecting plate is a relatively minor and easily replaceable part outside the main body of the damper (i.e., the CFRP-steel composite shear plate). It is an artificially designed, controllable weak point. This weak point is designed to preferentially yield and undergo plastic deformation before the CFRP may experience brittle failure (peeling or fracture), thereby dissipating seismic energy and protecting the main structure (especially the expensive CFRP-reinforced area) from catastrophic brittle failure. The specific principle is that stress concentration forms at the edge of the weakening hole in the connecting plate, causing the area to yield first and develop plastic deformation, forming an energy-dissipating plastic hinge. When making the weakening hole in the connecting plate, the starting load of the brittle failure mode (interface peeling, CFRP fracture) of the CFRP-reinforced shear plate is first determined. Then, the design yield load of the connecting plate should meet the following condition: the design yield load of the damper core shear plate < the design yield load of the connecting plate < the starting load of the brittle failure mode (interface peeling, CFRP fracture) of the CFRP-reinforced shear plate * 0.8. This ensures that the core yields first and dissipates energy.
[0028] 7. The stress concentration factor of an oblong hole is lower than that of a round hole, resulting in better plastic development. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the main structure of this utility model.
[0030] Figure 2 This is a schematic diagram of the structure of the present invention after setting the anti-detachment anchoring structure on the upper CFRP material layer and the anti-detachment anchoring structure on the lower CFRP material layer.
[0031] Figure 3 This is a schematic diagram of the structure from another perspective after setting the anti-detachment anchoring structure on the upper CFRP material layer and the anti-detachment anchoring structure on the lower CFRP material layer of this utility model.
[0032] Figure 4 This is a schematic diagram of the connecting plate of this utility model. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0034] Therefore, 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0035] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Specific Implementation Example 1: Figure 1 , Figure 2 , Figure 3 , Figure 4A low yield point steel shear plate damper reinforced with CFRP material is shown, comprising a connecting plate 1 and a shear plate 2. Two connecting plates 1 are horizontally fixed to the top and bottom of the shear plate 2, respectively. The shear plate 2 is perpendicular to the connecting plates 1. The shear plate 2 is arranged along the line connecting the midpoints of the two short sides of the connecting plate 1. The shear plate 2 is characterized by having flange plates 3 fixed to both sides of the shear plate 2. The top surface of the flange plate 3 is connected to the bottom surface of the connecting plate 1 at the top of the shear plate 2, and the bottom surface of the flange plate 3 is connected to the top surface of the connecting plate 1 at the bottom of the shear plate 2. The flange plate 3 is perpendicular to both the shear plate 2 and the connecting plate 1. At least one of the two surfaces of the shear plate 2 is bonded with a CFRP material layer 4.
[0040] The shear plate here is made of LY225 steel, and the flange plate is made of Q235 steel. Carbon fiber reinforced polymer (CFRP) provides a solution for upgrading the performance of dampers due to its ultra-high strength (>3000 MPa), lightweight (density 1.6 g / cm³) and fatigue resistance. In this solution, a CFRP material layer is used and bonded to one side of the shear plate to form a constraint effect, which effectively improves the buckling resistance of the shear plate, increases its buckling critical load by more than 50%, and delays crack propagation. Specific Implementation Example 2: This embodiment further describes the connecting plate 1 based on specific embodiment 1. The connecting plate 1 has a plurality of through-holes 11 in the vertical direction. Specific Implementation Example 3: This embodiment further describes the screw holes 11 on the plate body based on specific embodiment 2. There are a total of eight screw holes 11 on the plate body. Three of them are left-side screw holes, which are evenly distributed along the left screw hole layout line parallel to the left side of the connecting plate 1. The left-side screw holes are located on the outside of the left flange plate 3. Three of them are right-side screw holes, which are evenly distributed along the right screw hole layout line parallel to the right side of the connecting plate 1. The right-side screw holes are located on the outside of the right flange plate 3. The remaining two are middle screw holes, which are located between the left-side and right-side screw holes. The two middle screw holes are symmetrically arranged with the shear plate 2 as the symmetrical face. Specific Implementation Example 4: This embodiment further describes the connecting plate 1 based on specific embodiment 1. The length, width, and thickness of the connecting plate 1 are 50cm, 18cm, and 3cm, respectively. The length, height, and thickness of the shearing plate 2 are 26cm, 47cm, and 0.8cm, respectively. The length, height, and thickness of the flange plate 3 are 14cm, 47cm, and 1.2cm, respectively. When only one side of the shearing plate 2 is bonded and covered with the CFRP material layer 4, the thickness of the CFRP material layer 4 is 0.115cm. When both sides of the shearing plate 2 are bonded and covered with the CFRP material layer 4, the thickness of the CFRP material layer 4 on one side is 0.05cm.
[0044] When only one of the two sides of the shear plate is bonded and covered with a CFRP material layer, out-of-plane bending deformation will be induced due to the non-symmetrical structure, which will weaken the buckling resistance. Therefore, the CFRP material layer needs to be designed to be thicker here. When both sides of the shear plate are bonded and covered with CFRP material layers, it becomes a symmetrical structure. Such a symmetrical structure can eliminate or significantly reduce the out-of-plane bending effect, making the cross-section stress closer to the ideal pure shear state, the stress distribution is more uniform, and the buckling resistance of CFRP can be fully utilized. Therefore, it can be designed to be thinner here. Specific Implementation Example 5: This embodiment further illustrates the shear plate 2 based on specific embodiment 1. Both sides of the shear plate 2 are bonded with CFRP material layers 4.
[0046] Fiberglass reinforced polymer (CFRP) layers symmetrically bonded to both sides of a shear plate can eliminate or significantly reduce out-of-plane bending effects, making the cross-section more closely resemble the ideal pure shear state, resulting in a more uniform stress distribution and allowing CFRP to more fully exert its buckling resistance. Specific Implementation Example 6: This embodiment further describes the connecting plate 1 based on specific embodiment 5. The connecting plate 1 is provided with a shear plate connecting groove adapted to the shear plate 2 at the junction with the shear plate 2. The bottom surface of the connecting plate 1 located at the top of the shear plate 2 is provided with an anti-detachment anchoring structure 5 on the CFRP material layer, and the top surface of the connecting plate 1 located at the bottom of the shear plate 2 is provided with an anti-detachment anchoring structure 6 on the bottom of the CFRP material layer.
[0048] The bonding interface between CFRP and the shear plate is one of the weakest links in the entire structure, especially at the edge of the shear plate, where high shear stress and peel stress exist, which can seriously affect the stability of the bonding interface. The shear plate connection groove can firstly provide a certain degree of binding and anchoring for the end of the CFRP material layer, and secondly, protect the weld between the shear plate and the connecting plate. The anti-detachment anchoring structure on the upper and lower parts of the CFRP material layer can further bind and anchor the edge parts of the CFRP material layer, providing mechanical interlocking for the edge parts of the CFRP material layer and reducing the probability of peeling and propagation at the edge of the CFRP material layer. Specific Implementation Example 7: This embodiment further describes the anti-detachment anchoring structure 5 on the CFRP material layer and the anti-detachment anchoring structure 6 under the CFRP material layer based on specific embodiment 5. The anti-detachment anchoring structure 5 on the CFRP material layer includes two upper fixing plates 51 and two upper pressure plates 52. The two upper fixing plates 51 are symmetrically fixed in front of and behind the shear plate 2 with the shear plate 2 as the plane of symmetry. The upper fixing plates 51 are arranged parallel to the shear plate 2. At least two upper fixing plate bolt through holes are opened in the middle of the plate body of the upper fixing plate 51. The direction of the upper fixing plate bolt through holes is perpendicular to the shear plate 2. Upper clamping bolts 53 are threaded to the upper fixing plate bolt through holes. The inner side of the upper clamping bolts 53 passes through the upper fixing plate bolt through holes. The hole is rotatably connected to the upper pressure plate 52 located between the upper fixed plate 51 and the shear plate 2. The CFRP material layer anti-detachment anchoring structure 6 includes two lower fixed plates 61 and two lower pressure plates 62. The two lower fixed plates 61 are symmetrically fixed in front of and behind the shear plate 2 with the shear plate 2 as the plane of symmetry. The lower fixed plates 61 are arranged parallel to the shear plate 2. At least two or more lower fixed plate bolt through holes are opened in the middle of the plate body of the lower fixed plate 61. The direction of the lower fixed plate bolt through holes is perpendicular to the shear plate 2. The lower fixed plate bolt through holes are threadedly connected to the lower clamping bolts 63. The inner side of the lower clamping bolts 63 passes through the lower fixed plate bolt through holes and is rotatably connected to the lower pressure plate 62 located between the lower fixed plate 61 and the shear plate 2.
[0050] Tightening the upper clamping bolt will push the upper pressure plate against the CFRP material layer, and tightening the lower clamping bolt will push the lower pressure plate against the CFRP material layer. Once the upper and lower pressure plates are in place, they will limit and anchor the edge of the CFRP material layer, effectively reducing the probability of peeling and expansion at the edge of the CFRP material layer. The upper pressure plate is inverted "U" shaped, and the lower pressure plate is "U" shaped. When both are in place, they can completely cover the edge of the CFRP material layer. Specific Implementation Example 8: This embodiment further illustrates the CFRP material layer 4 based on specific embodiment 1. The surface of the CFRP material layer 4 is also coated with a fire-retardant coating layer.
[0052] The resin matrix of CFRP softens and decomposes at high temperatures, losing its load-bearing capacity for the fibers and reducing or even eliminating its reinforcing effect. Therefore, a fire-retardant coating layer is added to the surface of the CFRP material layer. Specific Implementation Example 9: This embodiment further describes the connecting plate 1 based on specific embodiment 1. At least one connecting plate weakening hole 12 is also provided in the middle of the connecting plate 1.
[0054] The weakening hole in the connecting plate is a relatively minor and easily replaceable part outside the main body of the damper (i.e., the CFRP-steel composite shear plate). It is an artificially designed, controllable weak link. This weak link is designed to preferentially yield and undergo plastic deformation before the CFRP may experience brittle failure (peeling or fracture), thereby dissipating seismic energy and protecting the main structure (especially the expensive CFRP-reinforced area) from catastrophic brittle failure. The specific principle is that stress concentration forms at the edge of the weakening hole in the connecting plate, causing the area to yield first and develop plastic deformation, forming an energy-dissipating plastic hinge. When making the weakening hole in the connecting plate, the starting load of the brittle failure mode (interface peeling, CFRP fracture) of the CFRP-reinforced shear plate is first determined. Then, the design yield load of the connecting plate should meet the following condition: the design yield load of the damper core shear plate < the design yield load of the connecting plate < the starting load of the brittle failure mode (interface peeling, CFRP fracture) of the CFRP-reinforced shear plate * 0.8. This ensures that the core yields first and dissipates energy. Specific Implementation Example 10: This embodiment further describes the weakening hole 12 of the connecting plate based on specific embodiment 9. The weakening hole 12 of the connecting plate is an oblong hole.
[0056] The stress concentration factor of an oblong hole is lower than that of a round hole, resulting in better plastic development.
[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A low yield point steel shear plate damper reinforced with CFRP material, comprising a connecting plate (1) and a shear plate (2), wherein there are two connecting plates (1), which are respectively horizontally fixed to the top and bottom of the shear plate (2), the shear plate (2) and the connecting plate (1) are perpendicular to each other, and the shear plate (2) is arranged along the line connecting the midpoints of the two short sides of the connecting plate (1), characterized in that: The shear plate (2) is also fixed with flange plates (3) on both sides. The top surface of the flange plate (3) is connected to the bottom surface of the connecting plate (1) at the top of the shear plate (2), and the bottom surface of the flange plate (3) is connected to the top surface of the connecting plate (1) at the bottom of the shear plate (2). The flange plate (3) is perpendicular to both the shear plate (2) and the connecting plate (1). At least one of the two surfaces of the shear plate (2) is bonded with a CFRP material layer (4).
2. The low yield point steel shear plate damper reinforced with CFRP material according to claim 1, characterized in that: The connecting plate (1) has several through-holes (11) in the vertical direction.
3. The low yield point steel shear plate damper reinforced with CFRP material according to claim 2, characterized in that: There are eight screw holes (11) in total. Three of them are left-side screw holes. The three left-side screw holes are evenly spaced along the left screw hole layout line parallel to the left side of the connecting plate (1). The left-side screw holes are located on the outside of the left flange plate (3). Three of them are right-side screw holes. The three right-side screw holes are evenly spaced along the right screw hole layout line parallel to the right side of the connecting plate (1). The right-side screw holes are located on the outside of the right flange plate (3). The remaining two are middle screw holes. The middle screw holes are located between the left-side and right-side screw holes. The two middle screw holes are symmetrically arranged with the shear plate (2) as the symmetrical face.
4. The low yield point steel shear plate damper reinforced with CFRP material according to claim 1, characterized in that: The length, width, and thickness of the connecting plate (1) are 50cm, 18cm, and 3cm, respectively. The length, height, and thickness of the shear plate (2) are 26cm, 47cm, and 0.8cm, respectively. The length, height, and thickness of the flange plate (3) are 14cm, 47cm, and 1.2cm, respectively. When only one side of the shear plate (2) is covered with a CFRP material layer (4), the thickness of the CFRP material layer (4) is 0.115cm. When both sides of the shear plate (2) are covered with a CFRP material layer (4), the thickness of the CFRP material layer (4) on one side is 0.05cm.
5. The low yield point steel shear plate damper reinforced with CFRP material according to claim 1, characterized in that: The shear plate (2) has CFRP material layers (4) bonded to both sides.
6. The low yield point steel shear plate damper reinforced with CFRP material according to claim 5, characterized in that: The connecting plate (1) and the shear plate (2) are provided with a shear plate connecting groove adapted to the shear plate (2). The bottom surface of the connecting plate (1) located at the top of the shear plate (2) is provided with an anti-detachment anchoring structure (5) on the CFRP material layer, and the top surface of the connecting plate (1) located at the bottom of the shear plate (2) is provided with an anti-detachment anchoring structure (6) on the bottom of the CFRP material layer.
7. The low yield point steel shear plate damper reinforced with CFRP material according to claim 6, characterized in that: The anti-detachment anchoring structure (5) on the CFRP material layer includes two upper fixing plates (51) and two upper pressure plates (52). The two upper fixing plates (51) are symmetrically fixed in front of and behind the shear plate (2) with the shear plate (2) as the plane of symmetry. The upper fixing plates (51) are arranged parallel to the shear plate (2). At least two upper fixing plate bolt through holes are opened in the middle of the plate body of the upper fixing plate (51). The direction of the upper fixing plate bolt through holes is perpendicular to the shear plate (2). The upper fixing plate bolt through holes are threaded with upper clamping bolts (53). The inner side of the upper clamping bolts (53) passes through the upper fixing plate bolt through holes and is rotatably connected to the upper pressure plate (52) arranged between the upper fixing plate (51) and the shear plate (2). The CFRP material layer anti-detachment anchoring structure (6) includes two lower fixing plates (61) and two lower pressure plates (62). The two lower fixing plates (61) are symmetrically fixed in front of and behind the shear plate (2) with the shear plate (2) as the plane of symmetry. The lower fixing plates (61) are arranged parallel to the shear plate (2). At least two or more lower fixing plate bolt through holes are opened in the middle of the plate body of the lower fixing plate (61). The direction of the lower fixing plate bolt through holes is perpendicular to the shear plate (2). The lower fixing plate bolt through holes are threaded with lower clamping bolts (63). The inner side of the lower clamping bolts (63) passes through the lower fixing plate bolt through holes and is rotatably connected to the lower pressure plate (62) set between the lower fixing plate (61) and the shear plate (2).
8. The low yield point steel shear plate damper reinforced with CFRP material according to claim 7, characterized in that: The surface of the CFRP material layer (4) is also coated with a fire-retardant coating layer.
9. The low yield point steel shear plate damper reinforced with CFRP material according to claim 1, characterized in that: At least one connecting plate weakening hole (12) is also provided in the middle of the connecting plate (1).
10. The low yield point steel shear plate damper reinforced with CFRP material according to claim 9, characterized in that: The weakening hole (12) of the connecting plate is an oblong hole.