A multi-stage buckling-restrained brace mechanism

Abstract

This utility model discloses a multi-stage buckling restraint support mechanism, including a first-stage energy-dissipating core plate, a second-stage energy-dissipating core plate, end ribs, a sleeve, and an end cap. The second-stage energy-dissipating core plates are arranged on both sides of the first-stage energy-dissipating core plate. The first-stage and second-stage energy-dissipating core plates are covered by a sleeve. The first-stage energy-dissipating core plate has end ribs at both ends. The two ends of the first-stage energy-dissipating core plate pass through the end cap and are connected to the two ends of the sleeve. The first-stage energy-dissipating core plate has screws at both ends. The second-stage energy-dissipating core plate has a round hole at one end and an elongated hole at the other end. The direction of the elongated hole is along the direction of the buckling restraint support force. After the round hole and elongated hole on both sides of the second-stage energy-dissipating core plate pass through the screws on both sides of the first-stage energy-dissipating core plate, the fastening nuts are tightened to complete the core plate connection. This utility model connects a first-order energy-dissipating core plate, a second-order energy-dissipating core plate, an end rib plate, a sleeve, and an end cover plate into a whole, achieving three levels of energy dissipation effects for minor, moderate, and major earthquakes, and can also solve the problem of buckling failure of ordinary steel diagonal braces under axial force.

Description

Technical Field

[0001] This utility model relates to a constraint support, specifically a multi-stage buckling constraint support mechanism. Background Technology

[0002] Buckling-restrained bracing (BRB) devices possess a defined buckling capacity, acting as a "safety net" during major earthquakes. Compared to traditional central bracing, BRBs constrain the buckling deformation of the core steel plate, enabling it to fully yield and dissipate seismic energy under both tension and compression. Their hysteresis curves are full and symmetrical, avoiding the sudden drop in load-bearing capacity caused by the buckling under compression of ordinary bracings, significantly improving the structure's seismic toughness. In the elastic stage, BRBs provide lateral stiffness comparable to traditional bracing, effectively controlling structural displacement. In the plastic stage, the yielding energy dissipation of the core steel reduces seismic damage to the main structure while maintaining stable load-bearing capacity. The core section, materials, and constraint mechanism of BRBs can be customized according to seismic requirements, achieving multi-level seismic fortification objectives of "elasticity in minor earthquakes, yielding in moderate earthquakes, and energy dissipation in major earthquakes," making them particularly suitable for important buildings and lifeline projects in high-intensity seismic zones.

[0003] Traditional buckling-restrained braces (BRBs) prevent overall buckling by setting restraint mechanisms around the core load-bearing member, achieving stable hysteretic energy dissipation performance. However, their single yielding mechanism has significant limitations:

[0004] Traditional buckling-restrained braces (BRBs) prevent overall buckling by setting restraint mechanisms around the core load-bearing member, achieving stable hysteretic energy dissipation performance. However, their single yielding mechanism has significant limitations:

[0005] Core components using uniform materials and cross-sections can only achieve optimal energy dissipation efficiency under specific earthquake intensities, making it difficult to adapt to the differentiated needs of "elasticity in minor earthquakes, yielding in moderate earthquakes, and continuous energy dissipation in major earthquakes" in multi-level seismic fortification.

[0006] Therefore, there is an urgent need to develop a new buckling restraint support system with graded yielding characteristics, smooth stiffness transition and simple structure. Utility Model Content

[0007] To address the technical problem that existing buckling-restrained braces do not yield or participate in energy dissipation under minor earthquakes, but fracture and fail under major earthquakes due to excessive product deformation, this utility model provides a multi-stage buckling-restrained brace mechanism.

[0008] This utility model provides the following technical solution:

[0009] A multi-stage buckling restraint support mechanism includes a first-stage energy-dissipating core plate, a second-stage energy-dissipating core plate, end ribs, a sleeve, and an end cap. Second-stage energy-dissipating core plates are disposed on both sides of the first-stage energy-dissipating core plate. The first-stage and second-stage energy-dissipating core plates are covered by a sleeve. End ribs are disposed at both ends of the first-stage energy-dissipating core plate. Both ends of the first-stage energy-dissipating core plate pass through the end cap and are connected to both ends of the sleeve. Screws are provided at both ends of the first-stage energy-dissipating core plate. A circular hole is provided at one end of the second-stage energy-dissipating core plate, and an elongated hole is provided at the other end of the second-stage energy-dissipating core plate. The elongated hole is oriented along the direction of the buckling restraint support force. Nuts are tightened after the circular and elongated holes on both sides of the second-stage energy-dissipating core plate pass through the screws on both sides of the first-stage energy-dissipating core plate, thus completing the core plate connection.

[0010] Furthermore, the screw is connected to the first-order energy-dissipating core plate via a butt weld.

[0011] Furthermore, the two sets of end ribs are located at both ends of the first-order energy-dissipating core plate and are fixedly connected to the first-order energy-dissipating core plate through butt welds.

[0012] Furthermore, the first-order energy-dissipating core plate and the second-order energy-dissipating core plate penetrate the internal cavity of the sleeve.

[0013] Furthermore, the end cover plate has a cross-shaped cut, and the end cover plate is welded to both ends of the sleeve after penetrating the first-stage energy-dissipating core plate.

[0014] Furthermore, concrete is injected into one end of the casing through a grouting hole.

[0015] Under small earthquakes, the first-order energy-dissipating core plate undergoes elastic deformation, and the relative deformation between it and the second-order energy-dissipating core plate produces a frictional energy dissipation effect.

[0016] Under moderate earthquake action, the entire device adds a buckling energy dissipation stage to the energy dissipation core plate, thereby enhancing the energy dissipation effect of the device.

[0017] Under the action of a major earthquake, the entire device adds a buckling energy dissipation stage to the second-order energy dissipation core plate. At the same time, the intervention of the second-order energy dissipation core plate in force transmission improves the load-bearing capacity and stiffness of the device. Therefore, this utility model can better adapt to the energy dissipation and load-bearing requirements under minor, moderate and major earthquakes.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] (1) This utility model achieves three levels of energy dissipation effect for small, moderate and large earthquakes through frictional energy dissipation between the first-order energy dissipation core plate and the second-order energy dissipation core plate, buckling energy dissipation of the first-order energy dissipation core plate and buckling energy dissipation of the second-order energy dissipation core plate. When a small earthquake occurs, the relative deformation between the first-order energy dissipation core plate and the second-order energy dissipation core plate generates frictional energy dissipation effect. When a moderate earthquake occurs, the entire device adds a buckling energy dissipation stage of the first-order energy dissipation core plate, enhancing the energy dissipation effect of the device. When a large earthquake occurs, the entire device adds a buckling energy dissipation stage of the second-order energy dissipation core plate. At the same time, the second-order energy dissipation core plate intervenes in force transmission, improving the load-bearing capacity and stiffness of the device. Therefore, this utility model can better adapt to the energy dissipation and load-bearing requirements under small, moderate and large earthquake conditions.

[0020] (2) This utility model adopts a constraint system composed of concrete and steel sleeve, which can effectively constrain the core plate and ensure the stability of the core plate.

[0021] In summary, this novel buckling-restrained bracing system with a simple structure can achieve energy dissipation effects under minor, moderate, and major earthquakes, and can solve the problem of buckling failure of ordinary steel bracing under axial force. Attached Figure Description

[0022] Figure 1 This is an overall schematic diagram of the multi-stage buckling restraint support mechanism of this utility model;

[0023] Figure 2 This is a schematic diagram of the multi-stage buckling restraint support mechanism of this utility model;

[0024] Figure 3 This is a schematic diagram of the elongated hole end structure of the core board of this utility model;

[0025] Figure 4 This is a schematic diagram of the core board circular hole end structure of this utility model.

[0026] In the diagram: 1. First-order energy-dissipating core plate; 2. Second-order energy-dissipating core plate; 3. End rib plate; 4. Sleeve; 5. End cap plate; 6. Nut; 7. Concrete; 8. Screw; 9. Oblong hole; 10. Round hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-4This utility model discloses a multi-stage buckling restraint support mechanism, comprising a first-stage energy-dissipating core plate 1, a second-stage energy-dissipating core plate 2, end ribs 3, sleeves 4, and end caps 5. Second-stage energy-dissipating core plates 2 are arranged on both sides of the first-stage energy-dissipating core plate 1. The first-stage energy-dissipating core plate 1 and the second-stage energy-dissipating core plate 2 are covered by sleeves 4. End ribs 3 are arranged at both ends of the first-stage energy-dissipating core plate 1. Both ends of the first-stage energy-dissipating core plate 1 pass through the end caps 5 and are connected to both ends of the sleeves 4. Screws 8 are provided at both ends of the first-stage energy-dissipating core plate 1. A circular hole 10 is provided at one end of the second-stage energy-dissipating core plate 2, and an elongated hole 9 is provided at the other end of the second-stage energy-dissipating core plate 2. The elongated hole 9 is oriented along the direction of the buckling restraint support force. The circular holes 10 and elongated holes 9 on both sides of the second-stage energy-dissipating core plate 2 pass through the screws 8 on both sides of the first-stage energy-dissipating core plate 1 and are then tightened with nuts 6 to complete the core plate connection.

[0029] The screw 8 is connected to the first-stage energy-consuming core plate 1 by a butt weld. After the welding is completed, the welded part needs to be ground to ensure the connection effect between the first-stage energy-consuming core plate 1 and the second-stage energy-consuming core plate 2.

[0030] Two sets of end ribs 3 are located at both ends of the first-order energy-dissipating core plate 1, and are fixedly connected to the first-order energy-dissipating core plate 1 by butt welds. Each set of end ribs 3 is symmetrical about the left and right ends of the first-order energy-dissipating core plate 1.

[0031] The first-order energy-dissipating core plate 1 and the second-order energy-dissipating core plate 2 penetrate the internal cavity of the sleeve 4. The end cover plate 5 has a cross-shaped cut. After penetrating the first-order energy-dissipating core plate 1, the end cover plate 5 is welded to both ends of the sleeve 4 to form a whole.

[0032] Before pouring concrete, the contact ends of the first-stage energy-dissipating core plate 1 and the second-stage energy-dissipating core plate 2 are wrapped with an adhesive-free material to prevent the concrete 7 from bonding with the core plate and to ensure the deformation effect of the core plate.

[0033] A grouting hole is opened at one end of the casing 4, through which concrete 7 is poured.

[0034] A certain friction coefficient is set between the contact surfaces of the first-order energy-dissipating core plate 1 and the second-order energy-dissipating core plate 2, and a certain warning force is required for the screw connection.

[0035] When a minor earthquake occurs, friction occurs between the contact surfaces of the first-order energy-dissipating core plate 1 and the second-order energy-dissipating core plate 2, dissipating earthquake energy.

[0036] When a moderate earthquake occurs, the first-order energy-dissipating core plate 1 begins to yield, and the entire device adds a yielding energy-dissipating stage to the first-order energy-dissipating core plate 1.

[0037] When a major earthquake occurs, the axial deformation of the first-order energy-dissipating core plate 1 exceeds the range of the elongated hole 9, and the second-order energy-dissipating core plate 2 begins to intervene in force transmission. Both the first-order energy-dissipating core plate 1 and the second-order energy-dissipating core plate 2 deform and dissipate energy, and the entire device increases the yielding energy dissipation stage of the second-order energy-dissipating core plate 2.

[0038] This utility model connects the first-order energy-dissipating core plate 1, the second-order energy-dissipating core plate 2, the end rib plate 3, the sleeve 4, and the end cover plate 5 into a whole, which can achieve three levels of energy dissipation effect for small earthquakes, moderate earthquakes, and large earthquakes, and can solve the problem of buckling failure of ordinary steel diagonal bracing under axial force.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage buckling restraint support mechanism, characterized in that: The device includes a first-order energy-consuming core plate (1), a second-order energy-consuming core plate (2), end ribs (3), a sleeve (4), and an end cap (5). The first-order energy-consuming core plate (1) is provided with second-order energy-consuming core plates (2) on both sides. The first-order energy-consuming core plate (1) and the second-order energy-consuming core plate (2) are covered with sleeves (4). The first-order energy-consuming core plate (1) is provided with end ribs (3) at both ends. The first-order energy-consuming core plate (1) passes through the end cap (5) and is connected to the two ends of the sleeve (4). The first-order energy-consuming core plate (1) is provided with screws (8) at both ends. The second-order energy-consuming core plate (2) is provided with a round hole (10) at one end and an elongated hole (9) at the other end. The round holes (10) and elongated holes (9) on both sides of the second-order energy-consuming core plate (2) pass through the screws (8) on both sides of the first-order energy-consuming core plate (1) and then the nuts (6) are tightened to complete the core plate connection.

2. The multi-stage buckling restraint support mechanism according to claim 1, characterized in that: The screw (8) is connected to the first-order energy-consuming core plate (1) by a butt weld.

3. The multi-stage buckling restraint support mechanism according to claim 1, characterized in that: Two sets of end ribs (3) are located at both ends of the first-order energy-consuming core plate (1) and are fixedly connected to the first-order energy-consuming core plate (1) by butt welds.

4. The multi-stage buckling restraint support mechanism according to claim 1, characterized in that: The first-order energy-consuming core plate (1) and the second-order energy-consuming core plate (2) penetrate the internal cavity of the sleeve (4).

5. A multi-stage buckling restraint support mechanism according to claim 4, characterized in that: The end cover plate (5) has a cross-shaped cut, and the end cover plate (5) passes through the first-stage energy-consuming core plate (1) and is welded to both ends of the sleeve (4).

6. The multi-stage buckling restraint support mechanism according to claim 1, characterized in that: Concrete (7) is poured into one end of the casing (4) through the grouting hole.

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