A combined friction-type buckling restrained brace

Abstract

The present invention discloses a combined friction-type buckling restraint support, which specifically relates to the field of building seismic isolation, and includes a buckling restraint support part and a friction energy-absorbing element part. The buckling restraint support part is composed of a main core material, stiffening ribs, waterproof membrane, filling material, a restraint sleeve and an end plate; the friction energy-absorbing element part is composed of a friction plate, a friction steel plate and a friction sheet. The friction energy-absorbing element is arranged on the connecting section of the buckling restraint support part, and is respectively connected to the main core material and the restraint sleeve through a friction steel plate and a friction pressure plate, so that the friction energy-absorbing element and the buckling restraint support can work and consume energy at the same time, and the friction energy-absorbing element is used to compensate for the defect that the buckling restraint support part does not consume energy in small earthquakes, so that the present invention can work and consume energy under small earthquakes, medium earthquakes and large earthquakes, thereby improving the energy-absorbing capacity of the support throughout the whole process.

Description

Technical Field

[0001] The invention belongs to the technical field of earthquake resistance and vibration reduction in civil engineering, and in particular relates to a combined friction-type buckling restrained brace. Background Art

[0002] Traditional structural design often adopts a "hard-hitting" approach, advocating for relying on the building's inherent structural rigidity to resist earthquakes. This means increasing the cross-section of structural components and the amount of material used. This not only results in a waste of cost, but also fails to achieve positive vibration control effects and makes it difficult to guarantee the safety of the building structure. Building structure energy dissipation and shock absorption technology involves installing energy dissipation devices within the structure to provide additional rigidity and damping. When an earthquake occurs, the energy dissipation devices plastically deform to dissipate the seismic energy, preventing damage or collapse of the building structure and achieving the desired shock absorption effect.

[0003] Buckling restrained energy-absorbing braces (BRBs) have been widely used as a component for energy dissipation and shock absorption in buildings. They have strong energy dissipation capacity and a full hysteresis curve. They can not only be used as structural components, but also as high-performance dampers after yielding. However, the conventional buckling restrained energy-absorbing braces currently have simple structures, single functions, and large initial elastic stiffness. They cannot play an energy-absorbing role when the structural displacement is small, resulting in the building structure being unable to meet the required inter-story displacement angle requirements under small earthquakes. The present invention improves the structure on the basis of conventional buckling restrained energy-absorbing braces, and at the same time combines friction energy-absorbing elements to achieve the performance requirements of small earthquake energy dissipation and improve the energy dissipation capacity and energy dissipation efficiency of the buckling brace. The mechanism is as follows: during small earthquakes, the friction energy-absorbing element part plays a role; during medium and large earthquakes, the friction energy-absorbing element part and the buckling restrained support part act simultaneously to consume seismic energy. After the structure is deformed, the self-seismic period is lengthened, which reduces the seismic input, thereby achieving the purpose of structural seismic response. Summary of the Invention

[0004] The present invention aims to provide a combined friction-type buckling-restrained brace. By combining a frictional energy dissipation element with the buckling-restrained brace, the present invention addresses the shortcomings of conventional buckling-restrained braces in terms of elasticity during small earthquakes. Furthermore, the buckling-restrained brace employed in the present invention offers improvements over conventional buckling-restrained brace structures, enhancing the buckling-restrained brace's energy dissipation efficiency. Consequently, the combined friction-type buckling-restrained brace of the present invention exhibits the mechanical properties of low yield displacement and high ductility, achieving the design goal of energy dissipation during small, moderate, and large earthquakes.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A combined friction-type buckling restraint support comprises a buckling restraint support portion and a friction energy dissipation element portion. Stiffening ribs are connected to the main core materials at both ends of the buckling restraint support portion to form a three-section structure of connecting section-energy dissipation section-connecting section. The friction energy dissipation element portion is symmetrically arranged on the connecting section of the buckling restraint support portion, and the symmetrically arranged friction energy dissipation elements are tightened and pressurized by bolt fasteners.

[0007] Furthermore, the buckling restraint support part includes a main core material, stiffening ribs, waterproof membrane, filling material and a restraint sleeve. The surface of the main core material of the energy-absorbing section and the adjacent connecting section is wrapped with waterproof membrane. The main core material of the part wrapped with waterproof membrane is firmly restrained by the restraint sleeve filled with filling material within its length, and the stiffening ribs are arranged perpendicular to the main core material.

[0008] Furthermore, the stiffening rib is arranged as a single full-length stiffening rib within its arrangement range.

[0009] Furthermore, the stiffening ribs are arranged in a segmented and disconnected manner within their setting range, with two stiffening ribs equidistantly arranged in a section close to the energy dissipation section, and one stiffening rib centered in an outer section, and the two stiffening ribs have a certain overlapping length.

[0010] Furthermore, end plates are provided at both ends of the restraining sleeve, and reinforcing ribs are provided at the connection between the end plates and the restraining sleeve.

[0011] Furthermore, the reinforcing rib is configured in the shape of an "L"-shaped angle steel, wherein one right-angled side is fixedly connected to the restraining sleeve, and the other right-angled side is tightly fitted to the end plate.

[0012] Furthermore, the friction energy dissipation element part is a single-sided friction structure or a double-sided friction structure.

[0013] Furthermore, the friction energy absorbing element part of the single-sided friction structural form includes a friction steel plate, a friction pressure plate, and a friction plate. The friction steel plate and the friction pressure plate are respectively fixedly connected to the connecting section and the end plate of the buckling constraint support part, wherein the friction pressure plate has a waist groove, the friction steel plate has a bolt hole, and the friction plate is arranged between the two gear strips and is arranged between the friction pressure plate and the friction steel plate through a fixing bolt fastener.

[0014] Furthermore, the friction energy absorbing element part of the double-sided friction structure includes a friction steel plate, a friction pressure plate, and a friction plate. There are two friction plates, wherein the friction pressure plate has a waist groove, the friction steel plate has a bolt hole, and the friction plate is arranged between the two gear strips and is arranged on both sides of the friction steel plate through fixing bolt fasteners. In addition, a positioning force transmission mechanism is also provided on the friction energy absorbing element part, and the positioning force transmission mechanism includes a positioning block and a positioning hole. The positioning block is fixedly connected to the connecting section of the buckling constraint support part, and the positioning hole is arranged on the friction pressure plate and fits tightly with the positioning block.

[0015] Furthermore, waist grooves are provided on the connecting section of the buckling restraint support part. The waist grooves can be provided on the main core material of the connecting section or on the stiffening ribs. The number of waist grooves is arbitrary.

[0016] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0017] 1. Better energy dissipation characteristics of buckling restrained brace: Generally, conventional buckling restrained brace is provided with a stiffening rib on each side of the connecting section, which is prone to stress concentration near the end of the stiffening rib under the action of displacement. The present invention improves the arrangement of the stiffening ribs of the buckling restrained brace, changes the arrangement of one stiffening rib into an arrangement of two stiffening ribs, adjusts the stress-strain distribution of the main core material under displacement, adjusts the maximum strain distribution position of the main core material and reduces the maximum strain of the main core material, thereby improving the energy dissipation effect of the buckling restrained brace.

[0018] 2. Mechanical properties of graded energy dissipation: Conventional buckling-restrained braces, due to their high stiffness, tend to remain elastic under small displacements and are resistant to plastic deformation. Therefore, conventional buckling-restrained braces struggle to dissipate energy during small earthquakes. The present invention incorporates frictional energy dissipation elements based on the buckling-restrained brace. These elements dissipate energy during small earthquakes. During moderate and large earthquakes, the frictional energy dissipation elements and the buckling-restrained brace simultaneously dissipate seismic energy, thereby achieving the design goal of graded energy dissipation.

[0019] 3. Friction energy dissipation elements are set at both ends, and are connected to the core material connection section and the constraint sleeve respectively through friction steel plates and pressure plates to ensure that the friction energy dissipation elements can work and dissipate energy from the beginning to the end;

[0020] 4. Save installation space. The friction energy dissipation element is installed on the connecting section. The size of the connecting section can accommodate the friction energy dissipation element. It does not affect the connection size between the connecting section and the gusset plate, and does not cause cost increase.

[0021] 5. Set up reinforcing corner ribs. Since one end of our friction energy dissipation element is fixedly connected to the end plate, reinforcing corner ribs are set up to strengthen the end plate to prevent it from being pulled or bulged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1;

[0023] Figure 2 It is a front view of embodiment 1;

[0024] Figure 3 This is the AA section of Example 1;

[0025] Figure 4 This is the BB section of Example 1;

[0026] Figure 5 A top view of Example 1;

[0027] Figure 6 Schematic diagram of the three-dimensional structure of embodiment 2

[0028] Figure 7 It is a front view of embodiment 2;

[0029] Figure 8 This is the main core material assembly of the buckling restraint support part of embodiment 2;

[0030] Figure 9 This is a schematic diagram of the three-dimensional structure of Example 3;

[0031] Figure 10 This is a front view of embodiment three.

[0032] In the figure, 1-buckling restraint support part, 1-1-main core material, 1-2-stiffening rib, 1-3-restraint sleeve, 1-4-end plate, 1-5-waterproof membrane, 1-6-filling material, 1-7-waist groove; 2-friction energy dissipation element; 2-1-friction pressure plate, 2-2-friction steel plate, 2-3-friction plate, 2-4-stop bar, 2-5-bolt fastener, 2-6-positioning block; 3-reinforcement angle rib. DETAILED DESCRIPTION

[0033] like Figure 1-10 In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] Example 1

[0035] A combined friction type buckling restraint support, characterized in that it includes a buckling restraint support part 1 and a friction energy dissipation element part 2, the main core material 1-1 at both ends of the buckling restraint support part 1 is connected with a stiffening rib 1-2 to form a three-section structure of a connecting section-energy dissipation section-connecting section, the friction energy dissipation element part 2 is symmetrically arranged on the connecting section of the buckling restraint support part 1, the buckling restraint support part 1 includes a main core material 1-1, stiffening ribs 1-2, a waterproof roll 1-5, a filling material 1-6 and a restraining sleeve 1-3, the surface of the main core material 1-1 of the energy dissipation section and the adjacent part of the connecting section is wrapped with a waterproof roll 1-5, and the main core material 1-1 wrapped with the waterproof roll 1-5 is covered within its length. The restraining sleeve 1-3 filled with filling material 1-6 is firmly restrained, the stiffening rib 1-2 is arranged perpendicular to the main core material 1-1, and the stiffening rib 1-2 is arranged in a single full-length manner within its setting range. End plates 1-4 are arranged at both ends of the restraining sleeve 1-3, and reinforcing angle ribs 3 are arranged at the connection between the end plates 1-4 and the restraining sleeve 1-3. The reinforcing angle ribs 3 are arranged in the shape of an "L"-shaped angle steel, one of which is fixedly connected to the restraining sleeve 1-3 at a right angle, and the other is tightly fitted with the end plate 1-4. The friction energy dissipation element part 2 is a double-sided friction structure. The friction energy dissipation element part 2 of the double-sided friction structure includes a friction steel plate 2-2, a friction pressure plate 2-1, a friction plate 2-3, and a friction plate 2-3. There are two pieces, wherein the friction pressure plate 2-1 has a waist groove, the friction steel plate 2-2 has a bolt hole, the friction plate 2-3 is arranged between the two gear bars 2-4 and is arranged on both sides of the friction steel plate 2-2 through a fixing bolt fastener 2-5, and a positioning force transmission mechanism is also provided on the friction energy dissipation element part 2, the positioning force transmission mechanism includes a positioning block 2-6 and a positioning hole, the positioning block 2-6 is fixedly connected to the connecting section of the buckling restraint support part 1, the positioning hole is arranged on the friction pressure plate 2-1 and fits tightly with the positioning block 2-6, a waist groove 1-7 is provided on the connecting section of the buckling restraint support part 1, the waist groove 1-7 is arranged on the stiffening rib 1-2, and the buckling restraint support has better energy dissipation characteristics: generally Under the present invention, a conventional buckling restraint support is provided with a stiffening rib on each side of the connecting section, which is prone to stress concentration near the end of the stiffening rib under the action of displacement. The present invention improves the arrangement of the stiffening ribs of the buckling restraint support, changes the arrangement of one stiffening rib to the arrangement of two stiffening ribs, adjusts the stress-strain distribution of the main core material under the action of displacement, adjusts the position of the maximum strain distribution of the main core material and reduces the maximum strain of the main core material, thereby improving the energy dissipation effect of the buckling restraint support part; it has the mechanical characteristic of graded energy dissipation: the conventional buckling restraint support tends to maintain elasticity under small displacement due to its large stiffness and is difficult to undergo plastic deformation. Therefore, it is difficult for the conventional buckling restraint support to play an energy dissipation role under small earthquakes. The present invention introduces a friction energy dissipation element on the basis of the buckling restraint support, and the friction energy dissipation element works to dissipate energy under the action of small earthquakes.During moderate and major earthquakes, the friction energy dissipation elements and the buckling restraint support elements work together to dissipate seismic energy, thereby achieving the design goal of graded energy dissipation.

[0036] Example 2

[0037] A combined friction-type buckling restraint support comprises a buckling restraint support portion 1 and a friction energy dissipation element portion 2. The main core material 1-1 at both ends of the buckling restraint support portion 1 is connected with stiffening ribs 1-2 to form a three-section structure of connecting section-energy dissipation section-connecting section. The friction energy dissipation element portion 2 is symmetrically arranged on the connecting section of the buckling restraint support portion 1. The buckling restraint support portion 1 comprises a main core material 1-1, stiffening ribs 1-2, waterproofing membrane 1-5, filling material 1-6 and a restraining sleeve 1-3. The surface of the main core material 1-1 of the energy dissipation section and the adjacent connecting section is wrapped with waterproofing membrane 1-5. The main core material 1-1 wrapped with waterproofing membrane 1-5 is filled with filling material 1-6 within its length. -6's constraint sleeve 1-3 is firmly constrained, and the stiffening rib 1-2 is vertically arranged with the main core material 1-1. The stiffening rib 1-2 is set in a segmented disconnected setting within its setting range. Two stiffening ribs 1-2 are set at equal distances in a section close to the energy dissipation section, and a stiffening rib 1-2 is set in the center of the outer section. The two sections of stiffening ribs 1-2 have a certain overlapping length. End plates 1-4 are set at both ends of the constraint sleeve 1-3, and reinforcing angle ribs 3 are set at the connection between the end plate 1-4 and the constraint sleeve 1-3. The reinforcing angle rib 3 is set in the shape of an "L"-shaped angle steel, one of which is fixedly connected to the constraint sleeve 1-3 at a right angle, and the other is tightly fitted with the end plate 1-4. The friction energy dissipation element part 2 is a single-sided friction structure. The friction energy absorbing element part 2 of the single-sided friction structure includes a friction steel plate 2-2, a friction pressure plate 2-1, and a friction plate 2-3. The friction steel plate 2-2 and the friction pressure plate 2-1 are respectively fixedly connected to the connecting section and the end plate 1-4 of the buckling restraint support part 1, wherein the friction pressure plate 2-1 has a waist groove, the friction steel plate 2-2 has a bolt hole, and the friction plate 2-3 is arranged between the two gear bars 2-4 and is arranged between the friction pressure plate 2-1 and the friction steel plate 2-2 through a fixing bolt fastener 2-5. A waist groove 1-7 is provided on the connecting section of the buckling restraint support part 1, and the waist groove 1-7 can be provided on the main core material 1-1 of the connecting section. The buckling restraint support has better energy dissipation characteristics: generally Under normal circumstances, a conventional buckling restraint support is provided with a stiffening rib on each side of the connecting section, which is prone to stress concentration near the end of the stiffening rib under the action of displacement. The present invention improves the arrangement of the stiffening ribs of the buckling restraint support, changes the arrangement of one stiffening rib to an arrangement of two stiffening ribs, adjusts the stress-strain distribution of the main core material under displacement, adjusts the position of the maximum strain distribution of the main core material and reduces the maximum strain of the main core material, thereby improving the energy dissipation effect of the buckling restraint support part; it has the mechanical characteristic of graded energy dissipation: the conventional buckling restraint support tends to maintain elasticity under small displacement due to its large stiffness and is difficult to undergo plastic deformation. Therefore, it is difficult for the conventional buckling restraint support to play an energy dissipation role under small earthquakes. The present invention introduces a friction energy dissipation element on the basis of the buckling restraint support, and the friction energy dissipation element works to dissipate energy under small earthquakes.During moderate and major earthquakes, the friction energy dissipation elements and the buckling restraint support elements work together to dissipate seismic energy, thereby achieving the design goal of graded energy dissipation.

[0038] Example 3

[0039] A combined friction-type buckling restraint support, characterized in that it includes a buckling restraint support part 1 and a friction energy dissipation element part 2, wherein the main core material 1-1 at both ends of the buckling restraint support part 1 is connected with a stiffening rib 1-2 to form a three-section structure of a connecting section-energy dissipation section-connecting section, and the friction energy dissipation element part 2 is symmetrically arranged on the connecting section of the buckling restraint support part 1. The buckling restraint support part 1 includes a main core material 1-1, stiffening ribs 1-2, a waterproof roll 1-5, a filling material 1-6 and a restraining sleeve 1-3. The surface of the main core material 1-1 of the energy dissipation section and the adjacent connecting section is wrapped with a waterproof roll 1-5, and the main core of the waterproof roll 1-5 is wrapped. The material 1-1 is firmly constrained by the constraint sleeve 1-3 filled with filling material 1-6 within its length range, the stiffening rib 1-2 is arranged perpendicular to the main core material 1-1, and the stiffening rib 1-2 is arranged in a single length within its setting range. End plates 1-4 are arranged at both ends of the bundle sleeve 1-3, and reinforcing angle ribs 3 are arranged at the connection between the end plate 1-4 and the constraint sleeve 1-3. The reinforcing angle ribs 3 are arranged in the shape of an "L"-shaped angle steel, one of which is fixedly connected to the constraint sleeve 1-3 at a right angle, and the other is tightly fitted with the end plate 1-4. The friction energy dissipation element part 2 is a single-sided friction structure, and the single-sided friction structure The friction energy dissipation element part 2 includes a friction steel plate 2 -2, friction pressure plate 2-1, friction plate 2-3, friction steel plate 2-2 and friction pressure plate 2-1 are respectively fixedly connected to the connection section and end plate 1-4 of the buckling restraint support part 1, wherein the friction pressure plate 2-1 is provided with a waist groove, the friction steel plate 2-2 is provided with a bolt hole, the friction plate 2-3 is arranged between the two gear bars 2-4 and is arranged between the friction pressure plate 2-1 and the friction steel plate 2-2 through a fixing bolt fastener 2-5, and a waist groove 1-7 is provided on the connection section of the buckling restraint support part 1, and the waist groove 1-7 can be provided on the main core material 1-1 of the connection section. The buckling restraint support has better energy dissipation characteristics: Under normal circumstances, the conventional buckling restraint support is connected A stiffening rib is set on each side of the segment. Under the action of displacement, stress concentration is likely to occur near the end of the stiffening rib. The present invention improves the arrangement of the buckling restraint support stiffening ribs, changes the arrangement of one stiffening rib to that of two stiffening ribs, adjusts the stress-strain distribution of the main core material under displacement, adjusts the position of the maximum strain distribution of the main core material and reduces the maximum strain of the main core material, thereby improving the energy dissipation effect of the buckling restraint support part; it has the mechanical characteristics of graded energy dissipation: conventional buckling restraint supports tend to remain elastic and are difficult to undergo plastic deformation under small displacements due to their large stiffness. Therefore, conventional buckling restraint supports are difficult to play an energy dissipation role under small earthquakes. The present invention introduces a friction energy dissipation element on the basis of the buckling restraint support, and the friction energy dissipation element works to consume energy under small earthquakes. During medium and large earthquakes, the friction energy dissipation element part and the buckling restraint support part work simultaneously to consume seismic energy. Thus, the design goal of graded energy dissipation is achieved.

[0040] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or layout of the subject combination arrangement. In addition to variations and modifications to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A combined friction-type buckling-restrained brace, characterized by: It comprises a buckling restraint support part (1) and a friction energy dissipation element part (2), wherein the main core materials (1-1) at both ends of the buckling restraint support part (1) are connected with stiffening ribs (1-2) to form a three-section structure of connecting section-energy dissipation section-connecting section, and the friction energy dissipation element part (2) is symmetrically arranged on the connecting section of the buckling restraint support part (1); The buckling restraint support portion (1) includes a main core material (1-1), stiffening ribs (1-2), a waterproof roll (1-5), a filling material (1-6) and a restraining sleeve (1-3); the surface of the main core material (1-1) of the energy dissipation section and the adjacent connecting section is wrapped with the waterproof roll (1-5); the main core material (1-1) wrapped with the waterproof roll (1-5) is firmly restrained by the restraining sleeve (1-3) filled with the filling material (1-6) within its length; the stiffening ribs (1-2) are arranged perpendicular to the main core material (1-1); The stiffening ribs (1-2) are arranged in a segmented disconnected manner within their arrangement range, with two stiffening ribs (1-2) being arranged at equal distances in a section close to the energy dissipation section, and one stiffening rib (1-2) being arranged in the center of an outer section, and the two stiffening ribs (1-2) being provided with a certain overlapping length; End plates (1-4) are provided at both ends of the restraining sleeve (1-3), and reinforcing ribs (3) are provided at the connection between the end plates (1-4) and the restraining sleeve (1-3); The reinforcing rib (3) is configured in the shape of an "L"-shaped angle steel, wherein one right-angled side is fixedly connected to the restraining sleeve (1-3), and the other right-angled side is tightly fitted to the end plate (1-4).

2. The combined friction-type buckling-restrained brace according to claim 1, characterized in that: The friction energy dissipation element part (2) is a single-sided friction structure or a double-sided friction structure.

3. The combined friction-type buckling-restrained brace according to claim 2, characterized in that: The friction energy dissipation element part (2) of the single-sided friction structural form comprises a friction steel plate (2-2), a friction pressure plate (2-1), and a friction plate (2-3). The friction steel plate (2-2) and the friction pressure plate (2-1) are respectively fixedly connected to the connecting section and the end plate (1-4) of the buckling restraint support part (1), wherein the friction pressure plate (2-1) is provided with a waist groove, the friction steel plate (2-2) is provided with a bolt hole, and the friction plate (2-3) is arranged between two gear bars (2-4) and is arranged between the friction pressure plate (2-1) and the friction steel plate (2-2) through a fixing bolt fastener (2-5).

4. The combined friction-type buckling-restrained brace according to claim 2, characterized in that: The friction energy absorbing element part (2) of the double-sided friction structure includes a friction steel plate (2-2), a friction pressure plate (2-1), and a friction plate (2-3). The friction plate (2-3) is provided with two pieces, wherein the friction pressure plate (2-1) is provided with a waist groove, the friction steel plate (2-2) is provided with a bolt hole, the friction plate (2-3) is provided between two gear bars (2-4) and is provided on both sides of the friction steel plate (2-2) through a fixing bolt fastener (2-5), and a positioning force transmission mechanism is also provided on the friction energy absorbing element part (2), the positioning force transmission mechanism includes a positioning block (2-6) and a positioning hole, the positioning block (2-6) is fixedly connected to the connecting section of the buckling restraint support part (1), and the positioning hole is provided on the friction pressure plate (2-1) and is tightly fitted with the positioning block (2-6).

5. The combined friction-type buckling-restrained brace according to claim 1, characterized in that: A waist groove (1-7) is provided on the connecting section of the buckling restraint support part (1), and the waist groove (1-7) is provided on the main core material (1-1) of the connecting section or on the stiffening rib (1-2).

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