A roller-supported buckling-restrained brace

Abstract

The present invention belongs to the technical field of civil engineering and relates to a roller-supported buckling-restrained brace, comprising: an external restraint member and an internal core plate. The external restraint member is tubular, and the radial cross-section of the inner hole is cross-shaped. The symmetry axis in the length direction of the inner hole coincides with the symmetry axis in the length direction of the external restraint member. The internal core plate is a cross-shaped plate that is orthogonal. The internal core plate matches the shape and size of the inner hole. A clearance fit is provided between the internal core plate and the inner hole. Connection segments are provided at both ends of the internal core plate, and a yield segment with a reduced radial dimension is provided in the middle of the two connection segments. Multiple rollers are provided on the yield segment. In the present invention, by opening a cross-shaped inner hole on the external restraint member, inserting an internal core plate of the same shape into the inner hole, and arranging rollers in the inner hole, the yield segment of the internal core plate is connected by rolling of the rollers. When the structure encounters an earthquake, the yield segment of the internal core plate yields earlier, showing good elastic and ductile characteristics and entering the energy dissipation state, ensuring the safety of the main structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of civil engineering and relates to a roller-supported buckling-restrained brace. Background Art

[0002] In order to solve the problem that under the action of rare earthquakes, the bracing members in a building structure are compressed and buckled under the action of reciprocating axial forces, resulting in a sudden drop in the axial bearing capacity and lateral stiffness of the structure and brittle failure, the existing buckling-restrained braces adopt the method of placing an internal core plate in a square steel pipe and then filling the gap between the square steel pipe and the internal core plate with concrete or mortar. The steel pipe filled with concrete or mortar serves as a restraint member to limit the buckling of the core plate, and at the same time, the buckling of the core plate can absorb and relieve the longitudinal force caused by the earthquake. Under the action of reciprocating cyclic axial loads during an earthquake, the yield section is tensioned or compressed and yields, while the transition sections and connection sections at both ends remain axially elastic. The restraint member can prevent the core plate from buckling as a whole when it is compressed, ensuring that the core plate only yields under the action of axial pressure without radial deformation. Since the phenomenon of compressive buckling of the brace is eliminated, the buckling-restrained brace exhibits stable and symmetric hysteretic performance. At the same time, in order to ensure that the core plate can freely expand and contract axially, a non-bonding material is filled between the interface of the core plate and the restraint member to eliminate friction, so as to improve the low-cycle fatigue performance of the buckling-restrained brace.

[0003] However, the existing buckling-restrained braces are composed of a steel square pipe structure and a concrete-like filling material, and are relatively heavy. When the buckling-restrained brace frame encounters a rare earthquake, the residual inter-story drift angle of the structure is relatively large, and the filled concrete or mortar is prone to leakage, as Figure 8 shown, resulting in relatively large radial displacements at both ends of the core plate due to the loosening or leakage of the concrete or mortar at both ends of the brace, causing relatively large potential safety hazards. Moreover, the friction effect between the core plate and the filling material is obvious, making the post-yield stiffness in the design calculation and analysis quite different from the actual working state of the brace, posing a potential safety hazard to the structure and deteriorating the reliability. At the same time, traditional buckling braces require long-term anti-corrosion maintenance, with high costs and great difficulties.

[0004] Therefore, a more safe, reliable, low-maintenance-cost and low-maintenance-difficulty buckling-restrained brace is needed to solve this problem. Summary of the Invention

[0005] The technical solution adopted by the present invention to solve the technical problem is: a roller-supported buckling-restrained brace, comprising: an external restraint member and an internal core plate. The external restraint member is tubular, the inner hole of the external restraint member communicates with both end faces of the external restraint member, the radial cross-section of the inner hole is cross-shaped, the symmetry axis in the length direction of the inner hole coincides with the symmetry axis in the length direction of the external restraint member, the internal core plate is a cross-shaped plate in orthogonal directions, the internal core plate matches the shape and size of the inner hole, and there is a clearance fit between the internal core plate and the inner hole;

[0006] Both ends of the internal core plate are provided with connecting sections. A yield section with a reduced radial dimension is provided between the two connecting sections. The length of the yield section is less than that of the external restraint member, and the length of the internal core plate is greater than that of the external restraint member. When the internal core plate is installed in place on the external restraint member, the lengths by which the connecting sections at both ends of the internal core plate extend beyond the end faces of the external restraint member are not greater than 1 / 2 of the length of the connecting sections.

[0007] A plurality of rollers are provided on the yield section, and the rolling direction of the rollers is the length direction of the inner hole. Both the external restraint member and the internal core plate are made of metal materials. When an earthquake occurs, the tensile or compressive force along the axis of the support is preferentially absorbed by the yield section. The yield section is restricted and supported by the rollers, the friction effect is greatly reduced, and it can be restored in time after the axial tensile or compressive force disappears. And since both the connecting section and the orifice of the inner hole are made of metal, there will be no occurrence of damage where large radial displacements are generated at both ends of the internal core plate due to the loosening or leakage of the concrete or mortar filled at both ends of the support, ensuring the safety and reliability of the building.

[0008] Preferably, the rollers include spherical rollers and cylindrical rollers. The spherical rollers have a high cost performance, and the cylindrical rollers can provide better support performance.

[0009] Preferably, a roller hoop is sleeved on the roller. The roller can rotate within the roller hoop. The roller hoop is connected to the hole wall of the inner hole. The roller is in rolling connection with the yield section of the internal core plate. The roller hoop can effectively ensure the position of each roller, thereby providing better support performance.

[0010] Preferably, the external restraint member is made of aluminum alloy, and the internal core plate is made of aluminum alloy or steel.

[0011] More preferably, the connecting section is made of steel, and the yield section is made of aluminum alloy.

[0012] Preferably, a transition section with a smooth transition is provided between the yield section and the connecting section.

[0013] More preferably, the transition section is an arc transition, a linear chamfer transition or a stepped transition.

[0014] Preferably, mounting holes are provided on the connecting section, and the mounting holes are located at the outer 1 / 2 of the length of the connecting section.

[0015] Preferably, the distance between two adjacent rollers is less than the diameter of the rollers.

[0016] Preferably, the rolling surface of the yield section and the rollers is smooth and flat.

[0017] The beneficial effects of the present invention are:

[0018] In the present invention, a cross-shaped inner hole is formed in an external restraint member, an inner core plate of the same shape is inserted into the inner hole, and rollers are arranged in the inner hole so that the rollers are in rolling connection with the yield section of the inner core plate. When the structure is subjected to an earthquake, the yield section of the inner core plate yields earlier, showing good axial elasticity and ductility characteristics, entering the energy dissipation state, and ensuring the safety of the main structure; since the rollers are used to support and restrain the yield section, the friction effect is greatly reduced. Since the external restraint member and the connection section are made of metal materials, compared with filling concrete or mortar between the traditional steel brace and the outer tube, the self-weight is greatly reduced and large radial displacements at both ends of the inner core plate will not be caused by the loosening or leakage of the concrete or mortar. At the same time, after using metal materials, the maintenance frequency is further reduced, thereby reducing its cost and maintenance cost, and the maintenance difficulty is reduced, which is conducive to replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of a roller-supported buckling-restrained brace;

[0020] Figure 2 is a partial perspective enlarged view of the brace end;

[0021] Figure 3 is an assembly and disassembly schematic diagram;

[0022] Figure 4 is a top view of the brace end;

[0023] Figure 5 is Figure 4 the A-A sectional view of

[0024] Figure 6 is a perspective view of the inner core plate;

[0025] Figure 7 is a schematic diagram of the assembly of the inner core plate and the rollers;

[0026] Figure 8 is a schematic diagram of the prior art.

[0027] In the figures, 1, external restraint member; 2, inner core plate; 3, inner hole; 4, connection section; 5, yield section; 6, roller; 7, roller hoop; 8, transition section; 9, mounting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the relevant technologies in the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Refer to Figures 1 to 8, A roller - supported buckling - restrained brace, comprising: an external restraint member 1 and an internal core plate 2. The external restraint member 1 is tubular. The inner hole 3 of the external restraint member 1 communicates with both end faces of the external restraint member 1. The radial cross - section of the inner hole 3 is cross - shaped. The axis of symmetry in the length direction of the inner hole 3 coincides with the axis of symmetry in the length direction of the external restraint member 1. The internal core plate 2 is a cross - shaped plate in orthogonal form. The internal core plate 2 matches the shape and size of the inner hole 3, and there is a clearance fit between the internal core plate 2 and the inner hole 3;

[0030] Both ends of the internal core plate 2 are provided with connecting sections 4. A yield section 5 with a reduced radial dimension is provided in the middle of the two connecting sections 4. The length of the yield section 5 is less than the length of the external restraint member 1. The length of the internal core plate 2 is greater than the length of the external restraint member 1. When the internal core plate 2 is installed in place in the external restraint member 1, the lengths by which the connecting sections 4 at both ends of the internal core plate 2 extend beyond the end faces of the external restraint member 1 are not greater than 1 / 2 of the length of the connecting sections 4;

[0031] A plurality of rollers 6 are provided on the yield section 5. The rolling direction of the rollers 6 is the length direction of the inner hole 3. Both the external restraint member 1 and the internal core plate 2 are made of metal materials. When an earthquake occurs, the tensile or compressive force along the axis of the brace is preferentially absorbed by the yield section 5. The yield section 5 is restricted and supported by the rollers 6, the friction effect is greatly reduced and it can recover in time after the axial tensile or compressive force disappears. And because both the connecting section 4 and the orifice of the inner hole 3 are made of metal, the situation of large radial displacement at both ends of the internal core plate 2 caused by the loosening or leakage of the concrete or mortar filled at both ends of the brace will not occur, ensuring the safety and reliability of the building.

[0032] Further, the rollers 6 include spherical rollers and cylindrical rollers. The spherical rollers have high cost - effectiveness, and the cylindrical rollers can provide better supporting performance.

[0033] Further, a roller hoop 7 is sleeved on the roller 6. The roller 6 can rotate within the roller hoop 7. The roller hoop 7 is connected to the hole wall of the inner hole 3. The roller 6 is in rolling connection with the yield section 5 of the internal core plate 2. The roller hoop 7 can effectively ensure the position of each roller 6, thereby providing better supporting performance.

[0034] Further, the external restraint member 1 is made of aluminum alloy, and the internal core plate 2 is made of aluminum alloy or steel.

[0035] Furthermore, the connecting section 4 is made of steel, and the yield section 5 is made of aluminum alloy.

[0036] Further, a transition section 8 with a smooth transition is provided between the yield section 5 and the connecting section 4.

[0037] Furthermore, the transition section 8 is an arc transition, a straight chamfer transition or a stepped transition.

[0038] Furthermore, an installation hole 9 is provided on the connecting section 4, and the installation hole 9 is located at the outer 1 / 2 of the length of the connecting section 4.

[0039] Furthermore, the distance between two adjacent rollers 6 is less than the diameter of the roller 6.

[0040] Furthermore, the rolling surface of the yielding section 5 and the roller 6 is smooth and flat.

[0041] Embodiment

[0042] In this embodiment, the external restraint member 1, the internal core plate 2, and the roller 6 made of aluminum alloy are used. The internal core plate 2 is divided into a yielding section 5, a transition section 8, and a connecting section 4 without restraint elasticity. The external restraint member 1 restricts the compressive buckling of the yielding section 5 through the support of the roller 6. The yielding section 5 is used for energy dissipation, and the entire buckling-restrained brace is connected to the main structure through the connecting section 4. The buckling-restrained brace is mainly used for energy dissipation of the structure under large earthquake actions, reducing the inter-story displacement, and reducing the self-weight of the members, and requires no maintenance during the entire service life of the structure.

[0043] When the structure encounters an earthquake, the yielding section 5 yields earlier, showing good axial elasticity and ductility characteristics, entering the energy dissipation state, and ensuring the safety of the main structure. Since the roller 6 is used to support and restrain the yielding section 5, the friction effect is greatly reduced. Even if the main structure undergoes large deformations, the buckling-restrained brace will not leak or fail. Since the buckling-restrained brace uses all-aluminum alloy materials, compared with traditional steel braces, the self-weight is greatly reduced. Therefore, this embodiment has good axial elasticity and radial rigidity, and further reduces the maintenance frequency after using aluminum alloy materials, thereby reducing its cost and maintenance cost and facilitating replacement.

[0044] In summary, the present invention provides a roller-supported buckling-restrained brace. By opening a cross-shaped inner hole on the external restraint member, inserting an internal core plate of the same shape into the inner hole, and arranging rollers in the inner hole, the rollers are in rolling connection with the yielding section of the internal core plate. When the structure encounters an earthquake, the yielding section of the internal core plate yields earlier, showing good elastic and ductile characteristics, entering the energy dissipation state, and ensuring the safety of the main structure. Therefore, the present invention has a wide range of application prospects.

[0045] It should be emphasized that the above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A roller-supported buckling-restrained brace, characterized in that, Comprising: An external restraint member (1) and an internal core plate (2), the external restraint member (1) is tubular, the inner hole (3) of the external restraint member (1) communicates with both end faces of the external restraint member (1), the radial cross-section of the inner hole (3) is cross-shaped, the symmetry axis in the length direction of the inner hole (3) coincides with the symmetry axis in the length direction of the external restraint member (1), the internal core plate (2) is a cross plate in orthogonal form, the internal core plate (2) matches the shape and size of the inner hole (3), and there is a clearance fit between the internal core plate (2) and the inner hole (3); both ends of the internal core plate (2) are provided with connecting sections (4), and a yield section (5) with a reduced radial dimension is provided in the middle of the two connecting sections (4), the length of the yield section (5) is less than the length of the external restraint member (1), the length of the internal core plate (2) is greater than the length of the external restraint member (1), when the internal core plate (2) is installed in place into the external restraint member (1), the lengths by which the connecting sections (4) at both ends of the internal core plate (2) extend out of the end faces of the external restraint member (1) are not greater than 1 / 2 of the length of the connecting section (4); A plurality of rollers (6) are provided on the yield section (5), and the rolling direction of the rollers (6) is the length direction of the inner hole (3); both the external restraint member (1) and the internal core plate (2) are made of metal materials; The rollers (6) include spherical rollers and cylindrical rollers; A roller hoop (7) is sleeved on the roller (6), the roller (6) can rotate within the roller hoop (7), the roller hoop (7) is connected to the hole wall of the inner hole (3), and the roller (6) is in rolling connection with the yield section (5) of the internal core plate (2).

2. The buckling-restrained brace with roller supports according to claim 1, wherein, The external restraint member (1) is made of aluminum alloy, and the internal core plate (2) is made of aluminum alloy or steel.

3. The buckling-restrained brace with roller supports according to claim 2, characterized in that, The connecting section (4) is made of steel, and the yield section (5) is made of aluminum alloy.

4. A roller-supported buckling-restrained brace according to claim 1, characterized in that, A transition section (8) with a smooth transition is provided between the yield section (5) and the connecting section (4).

5. A roller-supported buckling-restrained brace according to claim 4, characterized in that, The transition section (8) is an arc transition, a linear chamfer transition or a stepped transition.

6. A roller-supported buckling-restrained brace according to claim 1, wherein, Mounting holes (9) are provided on the connecting section (4), and the mounting holes (9) are located at the outer 1 / 2 of the length of the connecting section (4).

7. A roller-supported buckling-restrained brace according to claim 1, characterized in that, The distance between two adjacent rollers (6) is less than the diameter of the roller (6).

8. A roller-supported buckling-restrained brace according to claim 1, characterized in that, The rolling surface of the yield section (5) and the rollers (6) is smooth and flat.

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