一种钢筋混凝土梁柱节点抗震耗能加固装置与方法

Abstract

This invention relates to a seismic energy-dissipating reinforcement device and method for reinforced concrete beam-column joints. The device includes: a first shape memory alloy (SMI) component located on the beam in the beam-column joint area; a second SMI component installed on the column in the beam-column joint area and connected to the first SMI component; and a sliding friction damper connecting the first and second SMI components at both ends. This invention ensures the rigidity of the beam-column joint using a shape memory alloy T-plate while simultaneously dissipating energy and limiting excessive displacement between the beam and column through a sliding friction damper, thereby preventing progressive collapse and enabling automatic repositioning of the joint after deformation, thus enhancing the reinforcement effect of the reinforced concrete beam-column joint.

Description

Technical Field

[0001] This invention belongs to the field of reinforced concrete building reinforcement and repair technology, and relates to a device and method for seismic energy dissipation reinforcement of reinforced concrete beam-column joints. Background Technology

[0002] In reinforced concrete structures, load-bearing members are rigidly connected using steel reinforcement anchorage and monolithic concrete pouring. This joint exhibits significant rigidity, making it susceptible to stress concentration and even failure under dynamic loads such as wind-induced vibration or earthquakes. In older reinforced concrete historical buildings, beam-column joints often suffer from insufficient steel reinforcement anchorage length, missing horizontal stirrups in the column, or inadequate concrete pouring, significantly weakening the joint's load-bearing capacity. In some cases, beam-column joints may even fail before the beams and columns themselves during earthquakes. Therefore, beam-column joints are often critical areas for reinforcement and protection in the reinforcement and renovation of reinforced concrete historical buildings.

[0003] Common beam-column joint reinforcement methods include increasing the cross-section, steel plate bonding, external steel cladding, and external fiber reinforcement. While increasing the cross-section can improve the bending and shear capacity of the beam-column joint, it is difficult to construct and significantly impacts the building's historical appearance. Furthermore, materials used in steel plate bonding and external steel cladding are prone to corrosion during structural service, reducing the safety margin and affecting the building's aesthetics. External fiber reinforcement only improves the local bending and shear capacity of the beam-column joint area and cannot achieve overall reinforcement of the joint. All these methods aim to enhance the load-bearing capacity of the beam-column joint, rather than improving its energy dissipation capacity. Summary of the Invention

[0004] The purpose of this invention is to provide a seismic energy dissipation reinforcement device and method for reinforced concrete beam-column joints, so as to solve the problem of poor energy dissipation capacity in existing reinforced concrete beam-column joint reinforcement.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] One of the technical solutions of the present invention provides a seismic energy dissipation strengthening device for reinforced concrete beam-column joints, comprising:

[0007] The first shape memory alloy component located on the beam in the beam-column joint area;

[0008] A second shape memory alloy component is installed on the column in the beam-column joint area and connected to the first shape memory alloy component;

[0009] And a sliding friction damper that connects the first shape memory alloy component and the second shape memory alloy component at both ends respectively.

[0010] The sliding friction damper of the present invention can be selected from models such as FD-200kN.

[0011] Furthermore, the first shape memory alloy component includes:

[0012] A first shape memory alloy main board that is closely attached to the surface of the beam and has a first slot in the middle area;

[0013] A first web plate embedded inside the beam and with one end passing through the first slot;

[0014] The first shape memory alloy flange is integrally formed with the first shape memory alloy main board and located on both sides of the first slot. The first shape memory alloy flange is also fixedly connected to the first web plate.

[0015] Furthermore, the length of the first web plate is less than the length of the first shape memory alloy flange plate.

[0016] Furthermore, the first shape memory alloy flange is also provided with several sets of first holes corresponding to the positions, and the first web plate is fixedly connected to the first shape memory alloy flange by passing through the first holes and the first tie bolt.

[0017] Furthermore, the first shape memory alloy motherboard is also bolted to the beam.

[0018] Furthermore, the second shape memory alloy component includes:

[0019] A second shape memory alloy motherboard that is closely attached to the surface of the column and has a second slot in the middle area;

[0020] A second web plate embedded inside the column and with one end passing through the second slot;

[0021] The second shape memory alloy flange is integrally formed with the second shape memory alloy main board and located on both sides of the second slot. The second shape memory alloy flange is also fixedly connected to the second web plate.

[0022] Furthermore, the length of the second web is less than the length of the second shape memory alloy flange.

[0023] Furthermore, the second shape memory alloy flange is also provided with several sets of second holes corresponding to the position, and the second web plate is fixedly connected to the second shape memory alloy flange by passing through the second holes and the second tie bolts.

[0024] The second shape memory alloy motherboard is also connected to the column bolt.

[0025] Furthermore, the first shape memory alloy component and the second shape memory alloy component are connected and fixed together by connecting bolts.

[0026] Furthermore, the beam and the column are respectively wrapped with AFPR (aramid fiber reinforced composite material) layers that encapsulate the first shape memory alloy component and the second shape memory alloy component. ECC reinforced cement-based composite material is also applied to the AFPR layers and leveled.

[0027] The second technical solution of the present invention provides a method for seismic energy dissipation strengthening of reinforced concrete beam-column joints, comprising the following steps:

[0028] (1) Chisel open the concrete protective layer on the surface of the beam and column in the beam-column joint area, and fix the first shape memory alloy component and the second shape memory alloy component on the beam and the column respectively;

[0029] (2) Connect the first shape memory alloy component and the second shape memory alloy component;

[0030] (3) Fix the two ends of the sliding friction damper to the first shape memory alloy component and the second shape memory alloy component respectively to form a seismic energy dissipation reinforcement device for reinforced concrete beam-column joint as described above.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1) Shape memory alloy is a high-damping material; by slotting a room-temperature shape memory alloy and combining it with a sliding friction damping support structure (i.e., a sliding friction damper), the overall damping performance of the device can be greatly enhanced. While improving the bending bearing capacity and stiffness of the beam-column joint, it can dissipate seismic energy through damping energy dissipation and maintain the original structural characteristics of the beam-column joint.

[0033] 2) When the beam and column undergo relative displacement, the shape memory alloy plates in the first shape memory alloy component and the second shape memory alloy component deform and can recover their deformation, thus enabling automatic reset of the beam-column joint after deformation.

[0034] 3) When the beam is subjected to bending or rotational deformation, the sliding friction damping support structure, constrained by bolts, can act as a diagonal brace. Under seismic loading, when the displacement is small, the gap between the shape memory alloy plate and the sliding friction damper, filled with reinforcing friction particles, prevents structural displacement, thus dissipating energy and mitigating seismic forces. However, when the seismic load is large, the gap is eliminated, and the sliding friction damping support device slides within the groove to adaptively adjust deformation and dissipate seismic forces. Simultaneously, the sliding friction damping support device itself also dissipates energy, bears the load, and improves the strength of the joint. Therefore, this device, while preserving the structural characteristics of the joint, provides earthquake resistance, deformation resistance, energy dissipation, and resistance to progressive collapse.

[0035] 4) The reinforcement method of the present invention is concealed and can achieve the effect of authentic reinforcement and repair on the surface of reinforced concrete building joints. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a partial structural diagram of the present invention;

[0038] Figure 3 This is a schematic diagram of the sliding friction damper in this invention;

[0039] Figure 4 This is a schematic diagram of the structure of the first shape memory alloy component and the second shape memory alloy component;

[0040] Figure 5 Another structural schematic diagram of the first and second shape memory alloy components;

[0041] Explanation of markings in the diagram:

[0042] 1-Beam, 2-Column, 3-First shape memory alloy main plate, 4-Second shape memory alloy main plate, 5-Sliding friction damper, 6-First AFPR layer, 7-Second AFPR layer, 8-Leveling layer, 9-First web, 10-Second web, 11-Overlapping area, 12-Connecting bolt, 13-First tie bolt, 14-Second tie bolt, 15-First bolt A, 16-First bolt B, 17-Second bolt A, 18-Second bolt B, 19-First hole, 20-Second hole. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0044] In the following embodiments, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0045] To address the problem of poor energy dissipation capacity in existing reinforced concrete beam-column joints, this invention provides a seismic energy dissipation strengthening device for reinforced concrete beam-column joints, the structure of which can be found in [reference needed]. Figures 1 to 5 As shown, it includes:

[0046] The first shape memory alloy component located on the beam in the beam-column joint area;

[0047] A second shape memory alloy component is installed on the column in the beam-column joint area and connected to the first shape memory alloy component;

[0048] And a sliding friction damper 5 (such as FD-200kN) that is connected at both ends to the first shape memory alloy component and the second shape memory alloy component respectively.

[0049] In some specific embodiments, the first shape memory alloy component includes:

[0050] A first shape memory alloy main board 3 is closely attached to the surface of the beam and has a first slot in the middle area;

[0051] A first web plate 9 is embedded inside the beam and has one end passing through the first slot;

[0052] The first shape memory alloy flange plates are integrally formed with the first shape memory alloy main board 3 and located on both sides of the first slot. The first shape memory alloy flange plates are also fixedly connected to the first web plate 9. Here, the first shape memory alloy flange plates are vertically arranged on the first shape memory alloy main board 3 and parallel to the first slot to form a T-shaped plate structure.

[0053] In a more specific embodiment, the length of the first web plate 9 is less than the length of the first shape memory alloy flange plate, and the length of the first slot is also greater than the length of the first web plate 9, so that the web plate can slide in the slot, which not only enhances the applicability of the device under various conditions and dimensions, but also enhances the energy dissipation capacity of the structure.

[0054] In a more specific embodiment, the first shape memory alloy flange is further provided with several sets of first holes 19 corresponding to the positions, and the first web plate 9 is fixedly connected to the first shape memory alloy flange by passing through the first holes 19 and the first tie bolt 13. At least one set of first tie bolts 13 is provided, and two or more sets can be arranged according to design requirements.

[0055] In a more specific embodiment, the first shape memory alloy main board 3 is also bolted to the beam. Specifically, the bolted connection to the beam can be achieved by the first bolt A15 (away from the node) and the second bolt A17 (closer to the node) located at both ends of the first slot.

[0056] In some specific embodiments, the second shape memory alloy component includes:

[0057] A second shape memory alloy motherboard 4 is closely attached to the surface of the column and has a second slot in the middle area;

[0058] A second web plate 10 is embedded inside the column and has one end passing through the second slot;

[0059] The second shape memory alloy flange plates are integrally formed with the second shape memory alloy main board 4 and located on both sides of the second slot. The second shape memory alloy flange plates are also fixedly connected to the second web plate 10. Here, the second shape memory alloy flange plates are vertically arranged on the second shape memory alloy main board 4 and parallel to the second slot to form a T-shaped plate structure.

[0060] In a more specific embodiment, the length of the second web plate 10 is less than the length of the second shape memory alloy flange plate.

[0061] In a more specific embodiment, the second shape memory alloy flange is further provided with a number of second holes 20 corresponding to the position, and the second web plate 10 is fixedly connected to the second shape memory alloy flange by passing through the second holes 20 and the second web plate 10 with the second tie bolt 14.

[0062] In a more specific embodiment, the second shape memory alloy main board 4 is also bolted to the column. Specifically, the bolted connection to the beam can be achieved through the first bolt B16 (away from the node) and the second bolt B18 (closer to the node) located at both ends of the second slot.

[0063] In some specific embodiments, the first shape memory alloy component and the second shape memory alloy component are connected and fixed by connecting bolts 12. Generally, there is an overlapping area 11 between the first shape memory alloy component and the second shape memory alloy component. In this way, the connection between the two can only be achieved by using connecting bolts 12 to pass through the overlapping area 11 and tighten them.

[0064] In some specific embodiments, the beam and the column are respectively wrapped with AFPR layers that encapsulate the first shape memory alloy component and the second shape memory alloy component (the first AFPR layer 6 and the second AFPR layer 7 correspond to the beam and the column, respectively). ECC reinforced cement-based composite material is also applied to the AFPR layers and leveled (i.e., a leveling layer 8 is provided).

[0065] In some specific embodiments, gaps at all bolt connections between the first and second shape memory alloy components are filled with reinforcing friction particles. Specifically, the gaps are filled with epoxy resin adhesive and the reinforcing friction particles, which are then fixed within the gaps using the epoxy resin adhesive. This enhances the structural strength of the bolt connections, preventing damage to weak points due to stress concentration. Simultaneously, the reinforcing friction particles and epoxy resin adhesive improve the structure's energy dissipation capacity through friction.

[0066] Each of the above implementation methods can be implemented individually, or in any combination of two or more.

[0067] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0068] Example 1:

[0069] Combination Figures 1 to 5 This embodiment provides a reinforced reinforced concrete beam-column joint device, such as... Figures 1 to 5 As shown, the beam-column joint includes a beam 1 and a column 2. The overlapping area 11 of the first shape memory alloy main plate 3 and the second shape memory alloy main plate 4 (i.e., the upper end of the first shape memory alloy main plate 3 has an alloy plate integrally formed therewith) is connected by connecting bolts 12. The first shape memory alloy main plate 3 and the second shape memory alloy main plate 4 are also provided with a first slot and a second slot, respectively. The first web plate 9 and the second web plate 10 are respectively fixedly connected to the first shape memory alloy flange plate and the second shape memory alloy flange plate by passing through the first hole 19 and the second hole 20 through the first tie bolt 13 and the second tie bolt 14, respectively. A U-shaped first AFPR layer 6 is wrapped around the beam 6 and a second AFPR layer 7 is wrapped around the column 7 to wrap the above components. Finally, ECC reinforced cement-based composite material is applied again to the surface for leveling to form a leveling layer 8.

[0070] Shape memory alloys are high-damping materials. High damping means that the dissipation factor of shape memory alloys can reach 10. -1 The dissipation factor is on the order of magnitude, while that of ordinary metals such as steel and aluminum is only about 0.005. Therefore, combining room-temperature shape memory alloy with sliding friction damper 5 can enhance the damping performance of sliding friction damper 5. While improving the bending bearing capacity and stiffness of beam-column joints, it can dissipate seismic energy through damping energy dissipation, maintaining the original structural characteristics of beam-column joints. When displacement occurs, the shape memory alloy plate deforms and can recover its deformation, thus enabling automatic reset of beam-column joints after deformation.

[0071] The shape memory alloy T-shaped plate includes a main plate, flange plates, and web plates, corresponding to the first shape memory alloy assembly and the second shape memory alloy assembly, respectively. These are, in sequence, a first shape memory alloy main plate 3 and a second shape memory alloy main plate 4, a first shape memory alloy flange plate and a second shape memory alloy flange plate, and a first web plate 9 and a second web plate 10. The first web plate 9 and the second web plate 10 pass through a first slot and a second slot, respectively, and also through a first hole 19 and a second hole 20 provided on the first and second shape memory alloy flange plates, respectively, and are fixed using a first tie bolt 13 and a second tie bolt 14. Furthermore, the first shape memory alloy main plate 3 and the second shape memory alloy main plate 4 are connected to the beam and column using a first bolt A15, a first bolt B16, a second bolt A17, and a second bolt B18. The first bolts A15 and B16 are farther from the nodes, while the second bolts A17 and B18 are closer to the nodes.

[0072] Meanwhile, when the beam undergoes bending or rotational deformation, the sliding friction damper 5 acts as a diagonal brace. Under seismic loading, when the displacement is small, the sliding friction damper 5 has a certain displacement space, preventing overall structural deformation and thus ensuring the structural characteristics of the joint. However, when the seismic loading is large, the damper's displacement deformation reaches its maximum, and the shape memory alloy T-plate bears the force, increasing the joint's strength. Therefore, this device retains the structural characteristics of the beam-column joint while also providing resistance to progressive collapse.

[0073] By using ECC-reinforced cement-based composite material to recast on the surface and encapsulate the above components, the reinforcement method is concealed and can achieve the effect of authentic repair of the appearance of concrete beam-column joints.

[0074] The above-mentioned method for seismic energy dissipation strengthening of concealed reinforced concrete beam-column joints includes the following steps:

[0075] 1) Chisel away the protective concrete layer on the surface of the beam and column, and embed the web of the shape memory alloy T-plate (i.e., the first shape memory alloy component and the second shape memory alloy component) (i.e., the first web 9 and the second web 10) into the steel reinforcement layer according to the arrangement of the stirrups. After adjusting and fixing the position of the web, adjust the flange plate (i.e., the first shape memory alloy flange plate and the second shape memory alloy flange plate) to the height of the protective layer at the same time. Use two sets of bolts to fix the shape memory alloy T-plate (i.e., the first shape memory alloy main plate 3 and the second shape memory alloy main plate 4) to the beam and column.

[0076] 2) Connect the first shape memory alloy main board 3 and the second shape memory alloy main board 4 using connecting bolts 12;

[0077] 3) Apply epoxy resin adhesive to all bolt joints of the two sets of shape memory alloy T-plates and insert the friction-enhancing particles into the epoxy resin adhesive;

[0078] 4) Fix the two ends of the sliding friction damper 5 to the first shape memory alloy main board 3 and the second shape memory alloy main board 4 respectively using independent bolt sets;

[0079] 5) Wrap the beams and columns with U-shaped and ring-shaped AFPR (i.e., the first AFPR layer 6 and the second AFPR layer 7 respectively) to completely wrap the above components, and then apply ECC reinforced cement-based composite material to the surface to achieve the effect of authentic repair.

[0080] In summary, this invention ensures the rigidity of the beam-column joint by using a shape memory alloy T-plate, while using a sliding friction damper to dissipate energy and limit excessive displacement between the beam and column, thereby playing a role in resisting progressive collapse and enabling automatic resetting of the joint after deformation, thus enhancing the reinforcement effect of the reinforced concrete beam-column joint.

[0081] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A seismic energy dissipation reinforcement device for reinforced concrete beam-column joints, characterized in that, include: The first shape memory alloy component located on the beam in the beam-column joint area; A second shape memory alloy component is installed on the column in the beam-column joint area and connected to the first shape memory alloy component; And a sliding friction damper that connects the first shape memory alloy component and the second shape memory alloy component at both ends respectively; The first shape memory alloy component includes: A first shape memory alloy main board that is closely attached to the surface of the beam and has a first slot in the middle area; A first web plate embedded inside the beam and with one end passing through the first slot; The first shape memory alloy flange plate is integrally formed with the first shape memory alloy main board and located on both sides of the first slot. The first shape memory alloy flange plate is also fixedly connected to the first web plate. The second shape memory alloy component includes: A second shape memory alloy motherboard that is closely attached to the surface of the column and has a second slot in the middle area; A second web plate embedded inside the column and with one end passing through the second slot; The second shape memory alloy flange plate is integrally formed with the second shape memory alloy main board and located on both sides of the second slot. The second shape memory alloy flange plate is also fixedly connected to the second web plate. The length of the first web plate is less than the length of the first shape memory alloy flange plate; The first shape memory alloy flange is also provided with a number of first holes corresponding to the position, and the first web plate is fixedly connected to the first shape memory alloy flange by passing through the first holes and the first tie bolt. The first shape memory alloy mainboard is also bolted to the beam; The length of the second web plate is less than the length of the second shape memory alloy flange plate; The second shape memory alloy flange is also provided with several sets of second holes corresponding to the position, and the second web plate is fixedly connected to the second shape memory alloy flange by passing through the second holes and the second tie bolts. The second shape memory alloy motherboard is also connected to the column bolt.

2. The seismic energy dissipation reinforcement device for reinforced concrete beam-column joints according to claim 1, characterized in that, The first shape memory alloy component and the second shape memory alloy component are connected and fixed by connecting bolts.

3. The seismic energy dissipation reinforcement device for reinforced concrete beam-column joints according to claim 1, characterized in that, The beam and the column are respectively wrapped with AFPR layers that encapsulate the first shape memory alloy component and the second shape memory alloy component. ECC reinforced cement-based composite material is also applied to the AFPR layers and leveled.

4. A method for seismic energy dissipation strengthening of reinforced concrete beam-column joints, characterized in that, Includes the following steps: (1) Chisel open the concrete protective layer on the surface of the beam and column in the beam-column joint area, and fix the first shape memory alloy component and the second shape memory alloy component on the beam and the column respectively; (2) Connect the first shape memory alloy component and the second shape memory alloy component; (3) Fix the two ends of the sliding friction damper to the first shape memory alloy component and the second shape memory alloy component respectively to form a seismic energy dissipation reinforcement device for reinforced concrete beam-column joint as described in any one of claims 1-3.

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