Double friction energy dissipation beam-column replaceable joint

Abstract

The utility model belongs to the technical field of beam column connecting joint, disclose a kind of beam column replaceable node of double friction energy dissipation, including reinforced concrete column and reinforced concrete beam, steel beam embedded end is poured in reinforced concrete column, and steel beam cantilever end is connected reinforced concrete beam by energy dissipation component;Energy dissipation component includes the first end plate being connected on reinforced concrete beam, the second end plate being connected in steel beam cantilever end, and the first end plate is parallel with second end plate and interval is set distance;The center of first end plate is fixedly connected two first gable boards symmetrically, and first gable board is perpendicular to ground, and second gable board is clamped between two first gable boards, and second gable board is fixedly connected in the center of second end plate;The center of first gable board is provided with round hole, and rectangular hole with the length greater than the diameter of round hole is set up on second gable board, and friction rod is screwed after two ends threaded connection pre-tightening nut after passing through round hole and rectangular hole, and friction pad is clamped between first gable board and second gable board.The utility model has the effect of realizing double friction energy dissipation of beam column joint.

Description

Technical Field

[0001] This utility model belongs to the technical field of beam-column connection nodes, specifically relating to a replaceable beam-column node with dual friction energy dissipation. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Traditional concrete beam-column joints are prone to irreversible damage such as concrete crushing and steel buckling under earthquake loads. The residual deformation of the structure after the earthquake is large, making repair difficult and costly, and the building's function is interrupted during the repair process.

[0004] To address the aforementioned technical issues, existing technologies often employ prefabricated beam-column joints. For example, a prefabricated multi-stage energy-dissipating self-resetting steel-concrete composite beam-column joint includes a first connecting component connected to a steel-concrete composite column and a second connecting component connected to a steel beam. The first connecting component has two arc-shaped connecting plates, and the second connecting component has one arc-shaped connecting plate inserted between the two arc-shaped connecting plates of the first connecting component, and then hinged to them. During an earthquake, relative rotation occurs between the beam and column, causing the arc-shaped connecting plates to rotate relative to each other. The friction between the arc-shaped connecting plates dissipates the energy generated by the earthquake, and the joint is easy to repair after damage.

[0005] The above solution has the following drawbacks: Seismic waves are vibrations that propagate in all directions from the earthquake source. They can be classified into three types according to their propagation mode: longitudinal waves (P-waves), transverse waves (S-waves), and surface waves (L-waves). However, the frictional energy dissipation in the above scheme can only be achieved through the relative rotation of the arc-shaped connecting plates, and cannot offset the energy in the horizontal direction. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a replaceable beam-column joint with dual friction energy dissipation, which can solve the technical problem that the friction components in the prior art can only achieve rotational energy dissipation and cannot offset horizontal energy.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A replaceable beam-column joint with dual friction energy dissipation is provided, including a reinforced concrete column and a reinforced concrete beam. The embedded end of the steel beam is cast in the reinforced concrete column, and the cantilever end of the steel beam is connected to the reinforced concrete beam through an energy dissipation component. The energy-consuming component includes a first end plate fixedly connected to a reinforced concrete beam and a second end plate fixedly connected to the cantilever end of a steel beam. The first end plate and the second end plate are parallel and spaced apart by a set distance. Between the first end plate and the second end plate, two first rectangular plates are symmetrically fixedly connected to the center of the first end plate. The first rectangular plates are perpendicular to the ground. A second rectangular plate is sandwiched between the two first rectangular plates. The second rectangular plate is fixedly connected to the center of the second end plate. A circular hole is made in the center of the first rectangular plate, and a rectangular hole with a length greater than the diameter of the circular hole is made in the second rectangular plate. The friction rod passes through the circular hole and the rectangular hole and is threaded to the two ends with preload nuts. The friction plate is clamped between the first rectangular plate and the second rectangular plate. Support plates are connected between the top and bottom of the first end plate and the second end plate.

[0008] Preferably, the support plates are all made of yield steel plates, which are made of low yield point steel.

[0009] Preferably, the yield steel plate has multiple slotted holes, and the slotted holes are parallel to the first rectangular plate and the second rectangular plate.

[0010] Preferably, the longest slotted holes are located above the first rectangular plate and the second rectangular plate, and the lengths of the slotted holes on both sides decrease sequentially, forming a stepped distribution.

[0011] Preferably, the height of the rectangular hole is equal to the diameter of the circular hole, and the friction rod is located at the center of the rectangular hole.

[0012] Preferably, a first end plate is pre-embedded in the end of the reinforced concrete beam with a first vertical through hole, first bolt holes are opened at both ends of the yield steel plate, and a first vertical through hole is also pre-embedded at the cantilever end of the steel beam. After the first bolt hole is aligned with the first through hole, a first screw is inserted, and a first nut is threaded to the upper and lower ends of the first screw.

[0013] Preferably, the lengths of both the first rectangular plate and the second rectangular plate are less than the distance between the first end plate and the second end plate.

[0014] Preferably, the friction pad is a NAO friction pad.

[0015] Preferably, the axis of the steel beam coincides with the centerline of the reinforced concrete column, and the embedded end of the steel beam is provided with a reinforcing steel mesh, which is connected to the main reinforcement of the reinforced concrete column.

[0016] Preferably, multiple second through holes are evenly opened on the edge of the second end plate, and a connecting plate is welded to the cantilever end of the steel beam. Multiple second through holes are opened on the connecting plate accordingly. After the second through holes are aligned, the second screw passes through them, and the two ends of the second screw are threaded to the second nuts.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are: This invention features a circular hole in the first rectangular plate and a rectangular hole in the second rectangular plate with a length greater than the diameter of the circular hole. A friction rod passes through the circular hole and the rectangular hole, and preload nuts are threaded to both ends, allowing the first and second rectangular plates to not only rotate relative to each other but also slide relative to each other in the horizontal direction. By clamping a friction plate between the first and second rectangular plates, the friction of the friction plate dissipates seismic energy when the first and second rectangular plates rotate or slide relative to each other, thus achieving the function of dual friction energy dissipation at the beam-column joint. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1 This is a schematic diagram of a replaceable beam-column joint with dual friction energy dissipation according to an embodiment of this utility model; Figure 2 This is an exploded view of a replaceable beam-column joint with dual friction energy dissipation according to an embodiment of this utility model. Figure 3 This is a cross-sectional view of the node of this utility model embodiment, cut along the axis of the first through hole on the reinforced concrete beam; Figure 4 This is a cross-sectional view of the node of this utility model embodiment, taken along the axis of the first through hole on the steel beam; Figure 5 This is a schematic diagram of the first end plate of an embodiment of the present utility model; Figure 6 This is a schematic diagram of the second end plate according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the yield steel plate according to an embodiment of the present utility model; Figure 8 This is a top view of the connection between the first rectangular plate and the second rectangular plate in an embodiment of this utility model; In the picture: 1. Reinforced concrete column; 2. Steel beam; 3. Reinforced concrete beam; 4. Energy dissipation component; 41. First end plate; 411. First rectangular plate; 42. Second end plate; 421. Second rectangular plate; 43. Yield steel plate; 431. Groove hole; 5. Friction rod; 6. First screw; 7. Friction plate. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a replaceable beam-column joint with dual friction energy dissipation, such as... Figure 1 As shown, the structure includes a reinforced concrete column 1 and a reinforced concrete beam 3, with a steel beam 2 and an energy-dissipating component 4 installed between the reinforced concrete column 1 and the reinforced concrete beam 3. The embedded end of the steel beam 2 is cast inside the reinforced concrete column 1, and the cantilever end of the steel beam 2 is connected to the reinforced concrete beam 3 through the energy-dissipating component 4.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the energy-consuming component 4 includes a first end plate 41 fixedly connected to the reinforced concrete beam 3, and a second end plate 42 fixedly connected to the cantilever end of the steel beam 2. The first end plate 41 and the second end plate 42 are parallel and spaced apart by a predetermined distance. Figure 4 , Figure 5 As shown, between the first end plate 41 and the second end plate 42, two first rectangular plates 411 are symmetrically fixedly connected to the center of the first end plate 41. The first rectangular plates 411 are set perpendicular to the ground, as shown. Figure 4 , Figure 8 As shown, a second rectangular plate 421 is sandwiched between two first rectangular plates 411, as... Figure 6 As shown, the second rectangular plate 421 is fixedly connected to the center of the second end plate 42.

[0023] like Figure 5 As shown, a circular hole is formed at the center of the first rectangular plate 411, as... Figure 6 As shown, the second rectangular plate 421 has a rectangular hole with a length greater than the diameter of the circular hole, such as... Figure 1 , Figure 4 , Figure 8 As shown, the friction rod 5 passes through the round hole and the rectangular hole, and its two ends are threaded with pre-tightening nuts, so that the first rectangular plate 411 and the second rectangular plate 421 can not only rotate relative to each other, but also slide relative to each other in the horizontal direction. Figure 8 As shown, a friction plate 7 is clamped between the first rectangular plate 411 and the second rectangular plate 421. Tightening the preload nut clamps the first rectangular plate 411, the second rectangular plate 421, and the friction plate 7. When the first rectangular plate 411 and the second rectangular plate 421 rotate relative to each other, the friction of the friction plate 7 dissipates seismic energy. When the first rectangular plate 411 and the second rectangular plate 421 slide relative to each other, the friction of the friction plate 7 also dissipates seismic energy. Support plates are connected between the top and bottom of the first end plate and the second end plate, connecting the steel beam 2 and the reinforced concrete beam 3.

[0024] It is understandable that a hexagonal nut can be used for the preload nut, and the magnitude of the friction force can be adjusted by adjusting the clamping force applied to the first rectangular plate 411 and the second rectangular plate 421 by adjusting the preload nut. In practical applications, the rectangular hole can be designed as a rectangle or an ellipse, and the length of the rectangular hole is specifically set according to the designed slippage amount. The distance between the first end plate 41 and the second end plate 42 is specifically set according to the designed allowable distance.

[0025] It should be noted that this embodiment enables the dual friction energy dissipation function of the beam-column joint by allowing relative rotation and relative sliding between the first rectangular plate 411 and the second rectangular plate 421, as well as the friction action of the friction plate 7; it solves the problem that the prior art can only dissipate energy through rotation and cannot offset the horizontal seismic energy.

[0026] In this embodiment, steel beam 2 is made of I-beams.

[0027] like Figure 1 , Figure 2 As shown, the support plates are all yield steel plates. Specifically, a yield steel plate 43 connects the top of the first end plate 41 and the second end plate 42, and also connects the bottom of the first end plate 41 and the second end plate 42. The yield steel plate 43 is made of low-yield-point steel, meaning it is a metal plate that undergoes controllable plastic deformation upon reaching its yield strength. When relative rotation or relative slippage between the first and second rectangular plates reaches its limit, seismic energy continues to dissipate through the plastic deformation of the yield steel plate 43.

[0028] like Figure 7 As shown, the yield steel plate 43 has multiple slotted holes 431, which are parallel to the first rectangular plate 411 and the second rectangular plate 421, in order to optimize the energy dissipation path and guide and concentrate plastic deformation. In this embodiment, the slotted holes 431 are elongated hole structures opened in the yield steel plate, which can be rectangular or elliptical, with the purpose of guiding the plastic deformation path through the stress concentration effect at the edge of the hole.

[0029] Understandably, when the yield steel plate 43 is designed as a flat plate, plastic deformation may occur randomly and cannot be effectively guided and concentrated, resulting in low energy consumption efficiency and unpredictable damage location. However, by opening groove-shaped holes 431 parallel to the first rectangular plate 411 and the second rectangular plate 421 on the yield steel plate 43, the geometric discontinuity of the edge of the groove-shaped holes 431 is used to actively guide the stress distribution, constrain the plastic deformation in the area around the holes, and distribute it along the horizontal sliding direction and the direction of rotation. This avoids the dispersion of plastic deformation caused by directional deviation and prevents the deformation from randomly spreading to the entire yield steel plate 43.

[0030] like Figure 2 , Figure 4 , Figure 7As shown, the multiple slotted holes 431 on the yield steel plate 43 are of unequal length. The slotted holes 431 located above the first rectangular plate 411 and the second rectangular plate 421 are the longest, and the lengths of the slotted holes 431 on both sides decrease sequentially, forming a stepped distribution.

[0031] It should be noted that during the relative rotation of the first rectangular plate 411 and the second rectangular plate 421, the area directly above them has the mechanical property of withstanding a larger bending moment. The size of the slotted hole 431 above the first rectangular plate 411 and the second rectangular plate 421 is extended to form a low-stiffness zone, guiding plastic deformation to preferentially concentrate in the high-stress zone. According to the law that the deformation gradient gradually decreases from the center to the edge, the length of the slotted hole 431 on both sides is shortened in a regular manner, so that the hole size change matches the stress distribution, forming a continuous stiffness transition zone. This promotes the uniform diffusion of plastic deformation from the center to both sides, effectively preventing brittle fracture caused by stress abrupt change, and ensuring that the energy dissipation process is stable and controllable.

[0032] In this embodiment, the height of the rectangular hole is equal to the diameter of the circular hole, and the friction rod 5 is located at the center of the rectangular hole. It should be noted that having the height of the rectangular hole equal to the diameter of the circular hole eliminates the vertical degree of freedom of movement between the first and second rectangular plates, preventing unexpected displacement in the vertical direction that could damage the yield steel plate 43 and cause it to lose its energy-dissipating function. In this embodiment, the friction rod is located at the center of the rectangular hole to allow the beam-column joint to reciprocate in the horizontal direction, thus dissipating seismic energy.

[0033] like Figure 2 , Figure 5 , Figure 7 As shown, the first end plate 41 is pre-embedded in the end of the reinforced concrete beam 3 with a pre-reserved vertical first through hole. The two ends of the yield steel plate 43 are opened with first bolt holes. The cantilever end of the steel beam 2 is also pre-reserved with a vertical first through hole. After the first bolt hole is aligned with the first through hole, the first screw 6 is inserted. The first nut is threaded to the upper and lower ends of the first screw 6 to realize the fixed connection of the yield steel plate 43 at the top and bottom of the first end plate 41 and the second end plate 42. The yield steel plate 43 is detachable.

[0034] It is understandable that when replacing the yield steel plate 43 after the earthquake, if the first nuts at both ends of the first screw 6 are deformed, the first screw 6 can be cut off at both ends by cutting and then pushed out from the first through hole for replacement, ensuring that the newly replaced yield steel plate 43 and the first screw 6 are both intact components and can bear normal force.

[0035] It should be noted that the first end plate 41 is a thick plate, located at the end of the reinforced concrete beam 3 and welded and fixed to the main reinforcement of the beam. The first threaded rod is a high-strength 8.8 grade threaded rod, and the two ends are equipped with first nuts with spring washers and a specified torque is applied to ensure stable connection.

[0036] In this embodiment, the lengths of the first rectangular plate 411 and the second rectangular plate 421 are both less than the distance between the first end plate 41 and the second end plate 42. This is to prevent the first rectangular plate 411 or the second rectangular plate 421 from rigidly colliding with the first end plate 41 or the second end plate 42 during horizontal sliding, which would restrict the sliding stroke and prevent the inability to fully dissipate the horizontal seismic energy, thus reducing the energy dissipation efficiency of the node.

[0037] In this embodiment, except for the yield steel plate 43, the other plates can be made of Q345B steel plate, all of which have stable rigidity.

[0038] In this embodiment, the friction pad can be a NAO friction pad to ensure continuous and efficient energy dissipation, and it can be replaced after an earthquake.

[0039] In this embodiment, the axis of the steel beam 2 coincides with the centerline of the reinforced concrete column 1. A reinforcing steel mesh is installed at the embedded end of the steel beam 2 and connected (e.g., by binding) to the main reinforcement bars of the reinforced concrete column 1. The alignment of the steel beam 2's axis with the centerline of the reinforced concrete column 1 is to avoid additional torsional stress caused by eccentric loading and to prevent localized stress concentration in the joint area. The reinforcing steel mesh is used to improve the connection strength between the concrete and the steel beam 2.

[0040] Specifically, the reinforcing steel mesh is composed of horizontal and vertical hot-rolled ribbed steel bars woven in a grid pattern and fixed to the column steel bars by welding. The pre-embedded end of the steel beam is embedded in the mesh and fits tightly with it to ensure a strong overall connection when pouring concrete.

[0041] like Figure 1 , Figure 6 As shown, multiple second through holes are evenly opened on the edge of the second end plate 42. A connecting plate is welded to the cantilever end of the steel beam 2. Multiple second through holes are opened on the connecting plate accordingly. After the second through holes are aligned, the second screw passes through them. The two ends of the second screw are threaded to the second nuts.

[0042] Understandably, the second end plate 42 is also detachably connected to the steel beam 2. This is because when the second rectangular plate 421 on the second end plate 42 slides horizontally, the rectangular hole on the second rectangular plate 421 may come into contact with the friction rod 5 during reciprocating sliding, causing damage to the second rectangular plate 421. The second rectangular plate 421 can be replaced by replacing the second end plate 42.

[0043] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A replaceable beam-column joint with dual friction energy dissipation, comprising a reinforced concrete column and a reinforced concrete beam, characterized in that, The embedded end of the steel beam is cast into the reinforced concrete column, and the cantilever end of the steel beam is connected to the reinforced concrete beam through an energy-dissipating component. The energy-consuming component includes a first end plate fixedly connected to a reinforced concrete beam, and a second end plate fixedly connected to the cantilever end of the steel beam. The first end plate and the second end plate are parallel and spaced apart by a set distance. Between the first end plate and the second end plate, two first rectangular plates are symmetrically fixedly connected to the center of the first end plate. The first rectangular plates are perpendicular to the ground. A second rectangular plate is sandwiched between the two first rectangular plates. The second rectangular plate is fixedly connected to the center of the second end plate. A circular hole is opened in the center of the first rectangular plate, and a rectangular hole with a length greater than the diameter of the circular hole is opened in the second rectangular plate. The friction rod passes through the circular hole and the rectangular hole and is threaded to the two ends with pre-tightening nuts. A friction plate is clamped between the first rectangular plate and the second rectangular plate. Support plates are connected between the top and bottom of the first end plate and the second end plate.

2. The replaceable beam-column joint with dual friction energy dissipation as described in claim 1, characterized in that, The support plates are all made of yield steel plates, which are made of low yield point steel.

3. The replaceable beam-column joint with dual friction energy dissipation as described in claim 2, characterized in that, The yield steel plate has multiple slotted holes, and the slotted holes are parallel to the first rectangular plate and the second rectangular plate.

4. The replaceable beam-column joint with dual friction energy dissipation as described in claim 3, characterized in that, The slotted holes located above the first and second rectangular plates are the longest, and the lengths of the slotted holes on both sides decrease sequentially, forming a stepped distribution.

5. A replaceable beam-column joint with dual friction energy dissipation as described in claim 1, characterized in that, The height of the rectangular hole is equal to the diameter of the circular hole, and the friction rod is located at the center of the rectangular hole.

6. A replaceable beam-column joint with dual friction energy dissipation as described in claim 1, characterized in that, The first end plate is pre-embedded in the end of the reinforced concrete beam with a pre-reserved vertical first through hole. The yield steel plate has first bolt holes at both ends. The cantilever end of the steel beam also has a pre-reserved vertical first through hole. After the first bolt hole is aligned with the first through hole, the first screw is inserted. The first nut is threaded to the upper and lower ends of the first screw.

7. A replaceable beam-column joint with dual friction energy dissipation as described in claim 1, characterized in that, The lengths of both the first rectangular plate and the second rectangular plate are less than the distance between the first end plate and the second end plate.

8. A replaceable beam-column joint with dual friction energy dissipation as described in claim 1, characterized in that, The friction pad is a NAO friction pad.

9. A replaceable beam-column joint with dual friction energy dissipation as described in claim 1, characterized in that, The axis of the steel beam coincides with the centerline of the reinforced concrete column, and the embedded end of the steel beam is provided with a reinforcing steel mesh, which is connected to the main reinforcement of the reinforced concrete column.

10. A replaceable beam-column joint with dual friction energy dissipation as described in claim 1, characterized in that, Multiple second through holes are evenly opened on the edge of the second end plate. A connecting plate is welded to the cantilever end of the steel beam. Multiple second through holes are opened on the connecting plate accordingly. After the second through holes are aligned, the second screw passes through them. The two ends of the second screw are threaded to the second nuts.

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