All-steel assembly type step-by-step constraint multi-energy-consumption buckling-restrained brace

Abstract

The invention discloses an all-steel assembly type step-by-step constraint multiple energy consumption buckling restrained brace which comprises an inner core, a right connecting plate and a left connecting plate, and further comprises asymmetric T-shaped steel, a connecting piece and an outer steel pipe, the inner core is located between the left connecting plate and the right connecting plate, and the asymmetric T-shaped steel is fixedly connected with the inner core through bolts to form a symmetric structure; the two ends of the asymmetric T-shaped steel are fixedly connected with the left and right connecting plates through connecting pieces, the outer side of the asymmetric T-shaped steel is sleeved with an outer steel pipe, the left end of the outer steel pipe is not connected with the left connecting plate, and the right end of the outer steel pipe is connected with the right connecting plate. On the premise that the buckling-restrained energy consumption requirement is met, the structural design is optimized, so that the structure is light, the energy consumption capacity is improved, and meanwhile the moment of inertia of the section is increased. The method is suitable for various building structures, in particular to high-rise buildings, large-span buildings and existing buildings needing seismic strengthening.

Description

Technical Field

[0001] The present invention relates to the field of shock absorbing devices, in particular to an all-steel assembled buckling-restrained brace with step-by-step constraints and multiple energy dissipation. Background Art

[0002] Buckling-resistance braces are widely used in building structures and engineering to improve a structure's seismic and deformation resistance. In particular, when subjected to external loads (such as earthquakes and wind), they effectively limit the buckling of core energy-dissipating elements (typically steel plates or steel cores), dissipating and dissipating energy and minimizing structural damage. Due to the theoretical limits of the yield strength of steel core materials, existing all-steel restrained buckling-resistance braces are primarily used in low-rise, short-span structures.

[0003] The existing technology relies solely on core material energy dissipation. This single energy dissipation mode can easily cause the steel core to enter a low-cycle fatigue state prematurely under strong earthquakes. In order to improve the seismic resistance of the anti-buckling brace, the cross-section of the component is generally increased. However, this method will increase the weight of the support system, causing inconvenience in construction, and cause unnecessary waste of building space and conflict with the trend of lightweight building design. The energy dissipation capacity of the anti-buckling brace component decreases with the increase of the web thickness, while the stiffness increases with the web thickness. It is difficult to simultaneously increase the energy dissipation capacity and the size of the cross-sectional inertia moment of the anti-buckling brace with the existing technology.

[0004] Furthermore, existing buckling-resistance components typically rely on fixed connections like welding or riveting, which not only complicates manufacturing and installation but also makes structural repair more difficult. If a single component yields or fails, the entire structure typically needs to be replaced, wasting significant material and increasing the time and cost of repair and replacement. Summary of the Invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide an all-steel assembled buckling-restrained support with step-by-step constraints and multiple energy dissipation, which increases the energy dissipation capacity while increasing the moment of inertia of the section and synergistically optimizes the seismic performance.

[0006] The purpose of the present invention is achieved through the following technical solutions: An all-steel assembled, step-by-step constrained, multi-energy-consuming anti-buckling support comprises an inner core, a right connecting plate and a left connecting plate, wherein the inner core is located between the left connecting plate and the right connecting plate, and further comprises an asymmetric T-shaped steel, a connecting piece and an outer steel pipe, wherein the asymmetric T-shaped steel is fixedly connected to the inner core by bolts to form a symmetrical structure, and the two ends of the asymmetric T-shaped steel are fixedly connected to the left connecting plate and the right connecting plate by the connecting piece, and the outer steel pipe is sleeved on the outside of the asymmetric T-shaped steel, the left end of the outer steel pipe is not connected to the left connecting plate, and the right end of the outer steel pipe is connected to the right connecting plate.

[0007] Preferably, the cross-section of the asymmetric T-shaped steel has an asymmetric design, and the ratio of the long flange to the short flange is 1.2 - 1.5:1.

[0008] Preferably, several holes are provided on the surfaces of the asymmetric T-shaped steel and the inner core.

[0009] More preferably, the proportion of the hole-opening areas of the asymmetric T-shaped steel and the inner core is 20 - 30%.

[0010] Preferably, the cross-section of the component formed by combining the asymmetric T-shaped steel and the inner core is in an H shape.

[0011] Preferably, the length of the asymmetric T-shaped steel is 1 - 3 mm smaller than that of the inner core.

[0012] Preferably, the ratio of the web width of the asymmetric T-shaped steel to the width of the inner core is 1.3 - 1.5:1.

[0013] Preferably, the cross-section of the inner core is in a shape of one character.

[0014] Preferably, the cross-section of the outer steel pipe is oval.

[0015] Preferably, the size of the left connecting plate is smaller than that of the outer steel pipe.

[0016] The present invention has the following advantages and beneficial effects compared with the prior art: (1). On the premise of meeting the anti-buckling energy dissipation requirements, the anti-buckling brace disclosed by the present invention optimizes the structural design, making the structure lightweight, increasing the energy dissipation capacity while increasing the cross-sectional moment of inertia. It is applicable to the seismic design and reinforcement fields of various building structures, bridge projects, and industrial facilities, especially for engineering environments that are sensitive to structural weight and require efficient energy dissipation, such as high-rise buildings, large-span buildings, and existing buildings that need seismic reinforcement.

[0017] Adopting a multi-energy dissipation structure, the seismic energy is absorbed through the axial tensile and compressive yield deformations of the inner core and the asymmetric T-shaped steel, improving the safety and stability of the building structure under seismic conditions. When the anti-buckling brace is subjected to tensile and compressive forces, under the constraint of the asymmetric T-shaped steel, the inner core enters the tensile and compressive states as the left connecting plate and the right connecting plate move, thus achieving one-time energy dissipation; at the same time, under the constraint of the outer elliptical steel pipe, the asymmetric T-shaped steel enters the tensile and compressive states as the left connecting plate and the right connecting plate move, thus achieving two-time energy dissipation.

[0018] The design of step-by-step restraint enables the internal structure to achieve multiple energy dissipations under external loads, so that the brace can effectively absorb energy during the stress process. While increasing its energy dissipation capacity, it has characteristics such as lighter self-weight, low strength, high stiffness, small influence of welding residual stress, reduction of stress concentration in the main structure, reduction of deformation, prevention of buckling instability, etc., significantly improving the seismic performance and durability of the structure.

[0019] (2) The structural design of the present invention not only optimizes the energy dissipation mechanism, but also improves the stability of the overall system. The cross-section of the component composed of the asymmetric T-shaped steel and the inner core is in the shape of an H, with a large axial moment of inertia, which can further improve the stiffness of the structure, reduce the risk of structural instability, and solve the problem of small cross-sectional moment of inertia.

[0020] (3) The structure of the buckling-restrained brace of the present invention can adopt assembled connections. By means of bolt connections, it not only reduces production costs, improves the convenience of installation and maintenance, greatly reduces the need for welding, reduces construction difficulty, production costs and the influence of welding residual stress, and is convenient for construction and later maintenance. When the inner core yields, only the core component of the inner core needs to be replaced, rather than replacing the entire brace, thus simplifying the maintenance process and reducing the cost of replacing the overall structure. The outer elliptical steel pipe sleeved outside the asymmetric T-shaped steel effectively saves steel, reduces material consumption, and at the same time reduces the influence of wind load and improves the wind resistance of the structure. It is composed of all-steel materials, has a lighter self-weight, can effectively reduce the additional acting force on the main structure, and relieve the structural burden. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the longitudinal sectional view of the present invention; Figure 3 is the cross-sectional view of the present invention; Figure 4 is the exploded view of the components of the present invention.

[0022] Reference numerals: 1, inner core; 2, asymmetric T-shaped steel; 3, connecting piece; 4, outer steel pipe; 5, right connecting plate; 6, left connecting plate; 7, bolt; 8, connecting plug. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes in detail the invention purpose of the present invention with reference to the drawings and specific embodiments. The embodiments cannot be elaborated one by one here, but the implementation manners of the present invention are not limited to the following embodiments.

[0024] Embodiment 1 A fully steel assembled gradually constrained multi - energy - dissipating buckling - restrained brace, comprising an inner core 1, two asymmetric T - shaped steels 2, four connectors 3, an outer steel pipe 4, a right connecting plate 5 and a left connecting plate 6.

[0025] The cross - section shape of the inner core 1 is a straight - line shape. The left end of the inner core 1 is welded to the left connecting plate 6, which divides the left connecting plate 6 into front and rear parts. One connector 3 is arranged on each of the front and rear left connecting plates 6 at the front and rear ends of the inner core 1. The two connectors 3 and the left connecting plate 6 are fixedly connected by bolts 7. The right end of the inner core 1 is welded to the right connecting plate 5, which divides the right connecting plate 5 into front and rear parts. One connector 3 is arranged on each of the front and rear right connecting plates 5 of the inner core 1. The two connectors 3 and the right connecting plate 5 are fixedly connected by bolts 7. One connecting plug is integrally provided on each of the sides of the left connecting plate 6 and the right connecting plate 5 away from the inner core 1. The inner core 1, as the core part of the component, bears the external load and enters the tensile - compression state with the movement of the left connecting plate 6 and the right connecting plate 5, thus realizing one - level energy dissipation. Using bolts 7 for fixation ensures the firm connection between components and can withstand external loads. When the inner core 1 yields, only the core component of the inner core 1 needs to be replaced, rather than replacing the entire device support, thus simplifying the maintenance process and reducing the cost of replacing the overall structure.

[0026] Eleven bolts 7 are provided at each of the upper and lower edges of the inner core 1. Eleven holes adapted to the size of the bolts 7 are provided at each of the upper and lower edges of the webs of the two asymmetric T - shaped steels 2. The inner core 1 and the webs of the two asymmetric T - shaped steels 2 are fixedly connected by bolts 7. The two asymmetric T - shaped steels 2 form a symmetric structure and sleeve the inner core 1 in the center to achieve primary constraint. The length of the asymmetric T - shaped steel 2 is 2 mm shorter than that of the inner core 1, and its cross - section has an asymmetric design, with one flange being larger and the other flange being smaller, and the ratio of the long flange to the short flange is 1.2:1. Constraining the inner core 1 with the asymmetric T - shaped steel 2 can not only increase the energy - dissipating capacity of the component, but also the cross - section of the two asymmetric T - shaped steels 2 and the inner core 1 is equivalent to that of an H - shaped steel. At the same time, the component has a large axial moment of inertia, which can further improve the stiffness of the structure and reduce the risk of structural instability.

[0027] The upper and lower ends of the four connectors 3 are fixedly connected to the flanges and wings of the asymmetric T - shaped steels 2 by bolts 7. The connectors 3 fix the two asymmetric T - shaped steels 2 to the left and right connecting plates 5 to ensure the firm connection of each component. The asymmetric T - shaped steels 2 enter the tensile - compression state with the movement of the left connecting plate 6 and the right connecting plate 5, thus realizing secondary energy dissipation.

[0028] Several holes are evenly opened in the middle section of the asymmetric T - shaped steel 2 and the inner core 1, and the holes are evenly distributed on its surface. The proportion of the area with holes opened on the asymmetric T - shaped steel 2 and the inner core 1 is 20 - 30%. Opening several holes on the surfaces of the inner core 1 and the asymmetric T - shaped steel 2 can reduce the yield force of the buckling - restrained brace component and increase the energy - dissipating capacity.

[0029] An outer steel pipe 4 is sleeved outside the asymmetric T-shaped steel 2. The cross-section of the outer steel pipe 4 is elliptical. The left end of the outer steel pipe 4 is not connected to the left connecting plate 6, and the size of the left connecting plate 6 is smaller than that of the outer elliptical steel pipe 4, ensuring that the internal structure bears tension and compression and dissipates energy. The right end of the outer elliptical steel pipe 4 is connected to the right connecting plate 5. The outer elliptical steel pipe 4 is sleeved outside the asymmetric T-shaped steel 2 to constrain it, providing comprehensive protection for the internal structure and ensuring the long-term safety and reliability of the overall structure.

[0030] When an earthquake load acts, the buckling-restrained brace absorbs seismic energy through the axial tension and compression yield deformation of the inner core 1 and the asymmetric T-shaped steel 2. When the buckling-restrained brace is subjected to tension and compression, under the constraint of the asymmetric T-shaped steel 2, the inner core 1 enters the tension and compression state as the left connecting plate 6 and the right connecting plate 5 move, thus realizing the first energy dissipation. At the same time, under the constraint of the outer elliptical steel pipe 4, the asymmetric T-shaped steel 2 enters the tension and compression state as the left connecting plate 6 and the right connecting plate 5 move, thus realizing the second energy dissipation. The two work together, enabling the internal structure to achieve multiple energy dissipations under external loads and effectively absorbing energy during the stress process. At the same time, the cross-section of the component composed of the asymmetric T-shaped steel 2 and the inner core 1 is in the shape of an H, with a large axial moment of inertia, which can further improve the stiffness of the structure and reduce the risk of buckling of the buckling-restrained brace.

[0031] Embodiment 2 The assembly method of the present invention is as follows: This support is assembled in sections from the inside out; First step, the left connecting plate 6 is fixedly installed at the left end of the straight inner core 1, and the right connecting plate 5 is fixedly installed at the right end of the straight inner core 1 to form the support core component; Second step, lay the long flange and the short flange of the first asymmetric T-shaped steel 2 flat on the ground at the same time, with the web facing up to form a stable support on the ground. Then place the inner core 1 beside the web on the side of the longer flange, and then place the second asymmetric T-shaped steel on the first asymmetric T-shaped steel 2, with the web facing down, and the relative position reference Figure 2 and Figure 4 ; Third step: Align the bolt 7 holes on the web of the asymmetric T-shaped steel 2 with the connection positions, place washers, and sequentially pass the bolts 7 through the web of the asymmetric T-shaped steel 2 to connect them together to ensure the integrity of the component. The installation situation refers to Figure 4 ; Fourth step, place the first connecting piece 3 on the right side of the left connecting plate 6, between the flanges of the two asymmetric T-shaped steels 2, adjust the position according to the bolts 7, and the bolts 7 pass through the connecting piece 3 and the flanges of the asymmetric T-shaped steels 2 on both sides of the inner core 1 for connection respectively, further improving the connection strength. There are a total of four connecting pieces 3, which are connected sequentially, referring to Figure 4 ; Step 5: In Step 4, connect the connector 3 and the left connecting plate 6, which have already connected the asymmetric T-shaped steel 2, to the fixed connection through bolts 7, and connect the connector 3, which has already connected the asymmetric T-shaped steel 2, to the right connecting plate 5 through bolts 7. Connect the two connectors 3 at the left and right ends respectively in sequence, and the internal structure assembly is completed; Finally, an outer elliptical steel pipe 4 is sleeved outside the asymmetric T-shaped steel 2. The left end of the outer elliptical steel pipe 4 is not connected to the left connecting plate 6, and the right end of the outer elliptical steel pipe 4 is connected to the right connecting plate 5. For the overall structure, see Figure 1 .

[0032] The above specific implementation manners are the preferred embodiments of the present invention and cannot limit the present invention. Any other changes or other equivalent replacement methods made without departing from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. An all-steel assembled step-by-step restrained multi-energy dissipation buckling-restrained brace, comprising an inner core (1), a right connecting plate (5) and a left connecting plate (6), wherein the inner core (1) is located between the left connecting plate (6) and the right connecting plate (5), and is characterized in that: It also includes an asymmetric T-shaped steel (2), a connecting piece (3), and an outer steel pipe (4). The asymmetric T-shaped steel (2) is fixedly connected to the inner core (1) by bolts (7) to form a symmetric structure. Both ends of the asymmetric T-shaped steel (2) are fixedly connected to the left connecting plate (6) and the right connecting plate (5) through the connecting piece (3). The outer steel pipe (4) is sleeved outside the asymmetric T-shaped steel (2). The left end of the outer steel pipe (4) is not connected to the left connecting plate (6), and the right end of the outer steel pipe (4) is connected to the right connecting plate (5).

2. The all-steel assembled step-by-step restrained multi-energy-dissipating buckling-restrained brace according to claim 1 is characterized in that: The cross-section of the asymmetric T-shaped steel (2) has an asymmetric design, and the ratio of the long flange to the short flange is 1.2 - 1.5:

1.

3. The buckling-restrained brace with all-steel assembled step-by-step restraint and multiple energy dissipation according to claim 1, characterized in that, Several holes are provided on the surfaces of the asymmetric T-shaped steel (2) and the inner core (1).

4. The buckling-restrained brace with all-steel assembled step-by-step constraint and multiple energy dissipation according to claim 1, characterized in that, The cross-section of the component formed by combining the asymmetric T-shaped steel (2) and the inner core (1) is in the shape of an H.

5. The buckling-restrained brace with all-steel assembled step-by-step constraint and multiple energy dissipation according to claim 2, characterized in that, The length of the asymmetric T-shaped steel (2) is 1 - 3 mm smaller than that of the inner core (1).

6. The all-steel assembled step-by-step restrained multi-energy-dissipating buckling-restrained brace according to claim 1 is characterized in that: The ratio of the web width of the asymmetric T-shaped steel (2) to the width of the inner core (1) is 1.3 - 1.5:

1.

7. The all-steel assembled step-by-step restrained multi-energy-dissipating buckling-restrained brace according to claim 1 is characterized in that: The cross-section of the inner core (1) is in the shape of a straight bar.

8. The all-steel assembled step-by-step restrained multi-energy-dissipating buckling-restrained brace according to claim 1 is characterized in that: The cross-section of the outer steel pipe (4) is oval.

9. The all-steel assembled step-by-step restrained multi-energy-dissipating buckling-restrained brace according to claim 1 is characterized in that: The size of the left connecting plate (6) is smaller than that of the outer steel pipe (4).

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