A deformation-enhanced prefabricated double-yield-point buckling restraint brace

Abstract

A deformation-enhanced prefabricated double-yield-point buckling-restrained brace includes an inner restraint device, an outer restraint device, and an energy dissipation device installed between the inner and outer restraint devices. After a strong earthquake, the damage to the brace is concentrated in the energy dissipation device, while the inner and outer restraint devices remain undamaged, which helps reduce the repair cost of the brace after the earthquake. In addition, this brace has a two-stage stress characteristic, that is, under external load, the first and second energy dissipation core plates enter the yielding stage successively, realizing adaptive control of the deformation mode of the structure under strong earthquakes and suppressing the weak layer effect and post-earthquake residual displacement response. Furthermore, this invention achieves a series stress relationship between the first and second energy dissipation core plates through a special structure. Compared with existing double-yield-point buckling-restrained braces, this invention can significantly improve the ultimate deformation capacity and ultra-low cycle fatigue performance of the brace.

Description

Technical Field

[0001] This invention relates to the field of energy dissipation and vibration reduction technology in civil engineering, and in particular to a deformation-enhanced prefabricated double-yield-point buckling restraint brace. Background Technology

[0002] Traditional seismic-resistant systems, such as steel frames and concrete frames, dissipate seismic energy through the plastic deformation of beams and columns. However, these structures often suffer severe damage and residual deformation after strong earthquakes. Introducing additional energy dissipation and damping devices can effectively reduce damage to the main frame components. Buckling-restrained braces integrate the characteristics of ordinary braces and metallic dampers, possessing excellent energy dissipation capacity and stable hysteretic performance. They can easily meet the high load-bearing requirements of actual building structures and are therefore widely used in practical engineering.

[0003] However, due to the very low post-yield stiffness of buckling-restrained braces (BRBs) and the significant uncertainty of seismic motion, BRB frame structures exhibit inter-story deformation concentration under strong earthquakes, known as the "weak story" effect. This concentration of inter-story deformation in a few individual floors can lead to excessive deformation causing the BRBs to fracture or experience ultra-low cycle fatigue failure, posing a risk of collapse. Meanwhile, the supports in other floors cannot adequately dissipate seismic energy through plasticity. Furthermore, existing research indicates that BRB frame structures typically exhibit significant residual displacement after an earthquake, complicating post-earthquake repair efforts. When the residual inter-story drift angle exceeds 0.5%, the structure is generally considered beyond repair, and demolition becomes more economical. Summary of the Invention

[0004] To address the shortcomings of the prior art, the present invention aims to provide a deformation-enhanced prefabricated double-yield-point buckling restraint support device.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A deformation-enhanced prefabricated double-yield-point buckling restraint brace includes a detachably connected inner restraint device and an outer restraint device, and further includes:

[0007] The first energy-dissipating core plate is installed between the inner constraint device and the outer constraint device, and is located on opposite sides of the outer surface of the inner constraint device; the first energy-dissipating core plate includes a first yielding section, one end of the first yielding section is fixedly connected to one end of the inner constraint device, a limiting device is provided between the other end of the first yielding section and the inner constraint device, and the first yielding section is connected to a first connector.

[0008] The second energy-dissipating core plate is installed between the inner constraint device and the outer constraint device, and is located on the other two opposite sides of the outer surface of the inner constraint device; the second energy-dissipating core plate includes a second yielding section, one end of the second yielding section is fixedly connected to the other end of the inner constraint device, and the second yielding section is connected to a second connector.

[0009] The cross-sectional area of ​​the first yielding segment is smaller than the cross-sectional area of ​​the second yielding segment;

[0010] The first energy-dissipating core plate undergoes axial deformation under external load until the limiting device restricts the first energy-dissipating core plate from further axial deformation; as the external load continues to increase, the axial deformation only acts on the second energy-dissipating core plate.

[0011] Furthermore, the limiting device is a limiting post fixedly connected to the inner constraint device. The other end of the first yielding section is provided with a sliding groove that is movably adapted to the limiting post. The first energy-dissipating core plate undergoes axial deformation under external load until the side wall of the sliding groove abuts against the limiting post, at which point the first energy-dissipating core plate stops axially deforming.

[0012] Furthermore, the first yielding section has a first connecting section A and a first connecting section B with a cross-sectional area larger than the first yielding section at both ends, and the second yielding section has a second connecting section A and a second connecting section B with a cross-sectional area larger than the second yielding section at both ends. The first connecting section A and the second connecting section A are respectively fixedly connected to the two ends of the internal constraint device. The first connecting section B and the second connecting section B are respectively connected to connectors, and the first connecting section B is provided with the groove.

[0013] Furthermore, a first transition section with a gradually increasing cross-sectional area is provided between the first yielding section and the first connecting section A and the first connecting section B, and a second transition section with a gradually increasing cross-sectional area is provided between the second yielding section and the second connecting section A and the second connecting section B.

[0014] Furthermore, the second connecting section A and the second connecting section B are provided with a first stiffening rib.

[0015] Furthermore, the surfaces of the first and second yield sections are provided with an adhesive-free material to reduce friction between the first and second yield sections and the inner and outer constraint devices.

[0016] Furthermore, the internal constraint device is a rectangular tube, and two constraint plates are provided on any outer surface of the rectangular tube. A receiving groove for accommodating the first yielding section and the second yielding section is provided between the two constraint plates, and the height of the receiving groove is greater than the height of the first energy-consuming core plate and the second energy-consuming core plate.

[0017] Furthermore, each inner wall of the rectangular tube is provided with a second stiffening rib extending along its axial direction.

[0018] Furthermore, the external constraint device includes several external constraint body parts, the internal constraint device, the first energy-dissipating core plate and the second energy-dissipating core plate are located in the cavity surrounded by each of the external constraint bodies, and a filling sheet is provided between two adjacent external constraint bodies, and the height of the filling sheet is greater than the height of the first stiffening rib.

[0019] Furthermore, both the first connector and the second connector include an I-beam and a connector seat connected to one end of the I-beam, the I-beam being connected to the first connecting segment B and the second connecting segment B.

[0020] The beneficial effects of the present invention are:

[0021] This invention proposes a deformation-enhanced prefabricated double-yield-point buckling-restrained brace, comprising an inner restraint device, an outer restraint device, and an energy dissipation device installed between the inner and outer restraint devices. After a strong earthquake, the damage to the brace is concentrated in the energy dissipation device, while the inner and outer restraint devices remain undamaged, which helps reduce the repair cost of the brace after the earthquake. Furthermore, this brace exhibits a two-stage stress characteristic: under external loads, the first and second energy dissipation core plates yield sequentially, achieving adaptive control of the deformation mode under strong earthquakes, suppressing the weak-layer effect and post-earthquake residual displacement response, and realizing a series stress relationship between the first and second energy dissipation core plates. Compared with existing double-yield-point buckling-restrained braces, this invention can significantly improve the ultimate deformation capacity and ultra-low cycle fatigue performance of the brace. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a support device according to the present invention;

[0024] Figure 2 This is a schematic diagram of step one of the support devices of the present invention;

[0025] Figure 3 This is a schematic diagram of steps two and three of the support device of the present invention;

[0026] Figure 4 This is a schematic diagram of step four of a support device according to the present invention;

[0027] Figure 5 This is a schematic diagram of a rectangular tube supporting a device according to the present invention;

[0028] Figure 6 This is a schematic diagram of the first energy-consuming core plate of a support device according to the present invention;

[0029] Figure 7 This is a schematic diagram of the second energy-consuming core plate of a support device according to the present invention;

[0030] Figure 8 This is a schematic diagram of the external constraint body of a support device according to the present invention;

[0031] Figure 9 This is a schematic diagram of the second connector of a support device according to the present invention;

[0032] Figure 10 for Figure 5 Enlarged view of a portion of point A in the middle;

[0033] Figure 11 This is a cross-sectional view of a support device according to the present invention;

[0034] In the figure, 101 is a rectangular tube; 102 is a constraint plate; 103 is a receiving groove; 201 is the outer constraint body; 202 is a stiffening plate; 203 is a filler plate; 301 is the first energy-dissipating core plate; 3011 is the first connecting section A; 3012 is the first connecting section B; 3013 is the first yielding section; 302 is the second energy-dissipating core plate; 3021 is the second connecting section A; 3022 is the second connecting section B; 3023 is the second yielding section; 40. Transition section; 501, First connector; 502, Second connector; 5021, I-beam workpiece; 5022, Connecting seat; 601, First stiffening rib; 602, Second stiffening rib; 701, First connecting hole; 702, Second connecting hole; 703, Third connecting hole; 704, Fourth connecting hole; 705, Fifth connecting hole; 706, Sixth connecting hole; 707, Seventh connecting hole; 708, Eighth connecting hole; 80, Slide groove. Detailed Implementation

[0035] The following is combined Figure 1-11 The present invention will be described in detail below.

[0036] A deformation-enhanced prefabricated double-yield-point buckling restraint brace includes a detachably connected inner restraint device and an outer restraint device, and further includes an energy dissipation device installed between the inner restraint device and the outer restraint device. The energy dissipation device includes a first energy dissipation core plate 301 and a second energy dissipation core plate 302, specifically:

[0037] The first energy-dissipating core plate 301 is installed between the inner restraint device and the outer restraint device, and is located on opposite sides of the outer surface of the inner restraint device. The first energy-dissipating core plate 301 includes a first yielding section 3013. One end of the first yielding section 3013 is fixedly connected to one end of the inner restraint device. A limiting device is provided between the other end of the first yielding section 3013 and the inner restraint device. The first yielding section 3013 is connected to a first connector 501.

[0038] The second energy-dissipating core plate 302 is installed between the inner restraint device and the outer restraint device, and is located on the other two opposite sides of the outer surface of the inner restraint device; the second energy-dissipating core plate 302 includes a second yielding section 3023, one end of the second yielding section 3023 is fixedly connected to the other end of the inner restraint device, and the second yielding section 3023 is connected to a second connector 502.

[0039] The cross-sectional area of ​​the first yielding section 3013 is smaller than that of the second yielding section 3023, causing the first energy-dissipating core plate 301 to yield before the second energy-dissipating core plate 302 under external load, until the limiting device restricts the first energy-dissipating core plate 301 from continuing to undergo axial deformation; as the external load continues to increase, the axial deformation only acts on the second energy-dissipating core plate 302.

[0040] In practical use, after a strong earthquake, the damage to the support device is concentrated on the energy dissipation components, while the internal and external restraint devices remain undamaged, which helps reduce the repair costs of the support device after an earthquake. Furthermore, this support device achieves a series force relationship between the first energy dissipation core plate 301 and the second energy dissipation core plate 302, significantly improving the ultimate deformation capacity and ultra-low cycle fatigue performance of the support. Therefore, by combining the prefabricated buckling-restrained brace and the self-resetting brace proposed in this invention in a frame structure, the support can be replaced without needing to be replaced after a strong earthquake, allowing the structure to maintain normal functionality and thus reducing post-earthquake economic losses.

[0041] In this embodiment, the limiting device is a limiting post fixedly connected to the inner constraint device. The other end of the first yielding section 3013 is provided with a sliding groove 80 that is movably adapted to the limiting post. The first energy-consuming core plate 301 undergoes axial deformation under the action of external load until the side wall of the sliding groove 80 abuts against the limiting post and the first energy-consuming core plate 301 stops axial deformation.

[0042] In this embodiment, the first yielding section 3013 has a first connecting section A3011 and a first connecting section B3012 with a cross-sectional area larger than the first yielding section 3013 at both ends, and the second yielding section 3023 has a second connecting section A3021 and a second connecting section B3022 with a cross-sectional area larger than the second yielding section 3023 at both ends. The first connecting section A3011 and the second connecting section A3021 are fixedly connected to both ends of the inner restraint device, and the first connecting section B3012 and the second connecting section B3022 are respectively connected to connectors.

[0043] In this embodiment, the first connecting segment A3011 and the second connecting segment A3021 are provided with a first connecting hole 701 fixedly connected to the internal restraint device, the first connecting segment B3012 and the second connecting segment B3022 are provided with a second connecting hole 702 fixedly connected to the first connector 501 and the second connector 502, and the first connecting segment B3012 is provided with a sliding groove 80.

[0044] In this embodiment, a first transition section 40 with a gradually increasing cross-sectional area is provided between the first yielding section 3013 and the first connecting sections A3011 and B3012, and a second transition section 40 with a gradually increasing cross-sectional area is provided between the second yielding section 3023 and the second connecting sections A3021 and B3022. The second connecting sections A3021 and B3022 are provided with first stiffening ribs 601. Furthermore, the surfaces of the first yielding sections 3013 and 3023 are provided with an unbonded material to reduce friction between the first yielding sections 3013 and 3023 and the internal and external restraint devices.

[0045] In this embodiment, the internal restraint device is a rectangular tube 101 made of Q355B steel. Two restraint plates 102, also made of Q355B steel, are provided on the outer surface of any one of the rectangular tube 101. A receiving groove 103 for accommodating the first yielding section 3013 and the second yielding section 3023 is provided between the two restraint plates 102, and the height of the receiving groove 103 is greater than the height of the first energy-dissipating core plate 301 and the second energy-dissipating core plate 302. Furthermore, each inner wall of the rectangular tube 101 is provided with a second stiffening rib 602 extending axially. Furthermore, the rectangular tube 101 has third connecting holes 703 adapted to the first connecting holes 701 on opposite sides at both ends, and fourth connecting holes 704 adapted to the sliding groove 80 on opposite sides at one end of the rectangular tube 101.

[0046] In this embodiment, the external restraint device includes several external restraint bodies 201 made of Q355B steel, and stiffening plates 202 are arranged at intervals along the axial direction on the outer side of each external restraint body. The internal restraint device, the first energy-dissipating core plate 301, and the second energy-dissipating core plate 302 are located in the cavity surrounded by the external restraint bodies, and a filling plate 203 made of Q355B steel is provided between two adjacent external restraint bodies. The height of the filling plate 203 is greater than the height of the first stiffening rib 601. Specifically, the height of the filling plate 203 is 1-2 mm greater than the height of the first stiffening rib 601. Furthermore, each external restraint body 201 is provided with a fifth connecting hole 705 that is adapted to each other, and also with a sixth connecting hole 706 and a seventh connecting hole 707 that are adapted to the third connecting hole 703 and the fourth connecting hole 704, respectively.

[0047] In this embodiment, the first connector 501 and the second connector 502 are made of Q355B steel. Both the first connector 501 and the second connector 502 include an I-beam workpiece 5021 and a connecting seat 5022 connected to one end of the I-beam workpiece 5021. The I-beam workpiece 5021 is connected to the first connecting segment B3012 and the second connecting segment B3022. The I-beam workpiece 5021 is provided with an eighth connecting hole 708 adapted to the second connecting hole 702.

[0048] The present invention proposes a deformation-enhanced prefabricated double-yield-point buckling-restrained brace, the assembly method of which is as follows:

[0049] Step 1: Install the first energy-dissipating core plate 301 on the opposite sides of the inner restraint device, place the first yielding section 3013 of the first energy-dissipating core plate 301 in the receiving groove 103, and align the first connecting hole 701 with the third connecting hole 703 at one end of the inner restraint device; install the second energy-dissipating core plate 302 on the other opposite sides of the inner restraint device, place the second yielding section 3023 of the second energy-dissipating core plate 302 in the receiving groove 103, and align the first connecting hole 701 with the third connecting hole 703 at the other end of the inner restraint device;

[0050] Step 2: Place the filler plate 203 between the two outer constraint bodies, pass the fastening screw through the fifth connecting hole 705, and then tighten the two outer constraint bodies with the fastening nut to complete the assembly of one part of the outer constraint device. Repeat the above steps to complete the assembly of the other part of the outer constraint device. Place the filler plate 203 between the two parts of the outer constraint device, and lock the two parts of the outer constraint device together with the fastening device to complete the assembly of the outer constraint device.

[0051] Step 3: Fastening screws are inserted into the first connecting hole 701, the third connecting hole 703, and the sixth connecting hole 706. One end of the external restraint device is locked to the outside of the energy dissipation device by fastening nuts. Fastening screws are inserted into the fourth connecting hole 704, the slide groove 80, and the seventh connecting hole 707. The other end of the external restraint device is locked to the outside of the energy dissipation device by fastening nuts, and the fastening screws constitute a limiting post.

[0052] Step 4: Fastening screws are inserted into the second connecting hole 702 and the eighth connecting hole 708, and the first connecting head 501 and the second connecting head 502 are locked to the first connecting section B3012 and the second connecting section B3022 respectively by fastening nuts.

[0053] Step 5: Complete the installation.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A deformation-enhanced prefabricated double-yield-point buckling restraint support device, characterized in that, It includes a detachably connected internal restraint device and an external restraint device, and also includes: The first energy-dissipating core plate is installed between the inner constraint device and the outer constraint device, and is located on opposite sides of the outer surface of the inner constraint device; the first energy-dissipating core plate includes a first yielding section, one end of the first yielding section is fixedly connected to one end of the inner constraint device, a limiting device is provided between the other end of the first yielding section and the inner constraint device, and the first yielding section is connected to a first connector. The second energy-dissipating core plate is installed between the inner constraint device and the outer constraint device, and is located on the other two opposite sides of the outer surface of the inner constraint device; the second energy-dissipating core plate includes a second yielding section, one end of the second yielding section is fixedly connected to the other end of the inner constraint device, and the second yielding section is connected to a second connector. The cross-sectional area of ​​the first yielding segment is smaller than the cross-sectional area of ​​the second yielding segment; The first energy-dissipating core plate undergoes axial deformation under external load until the limiting device restricts the first energy-dissipating core plate from further axial deformation; as the external load continues to increase, the axial deformation only acts on the second energy-dissipating core plate.

2. The support device as described in claim 1, characterized in that, The limiting device is a limiting post fixedly connected to the inner constraint device. The other end of the first yielding section is provided with a sliding groove that is movably adapted to the limiting post. The first energy-dissipating core plate undergoes axial deformation under external load until the side wall of the sliding groove abuts against the limiting post, at which point the first energy-dissipating core plate stops axial deformation.

3. The support device as described in claim 2, characterized in that, The first yielding section has a first connecting section A and a first connecting section B with a cross-sectional area larger than the first yielding section at both ends. The second yielding section has a second connecting section A and a second connecting section B with a cross-sectional area larger than the second yielding section at both ends. The first connecting section A and the second connecting section A are fixedly connected to the two ends of the internal constraint device. The first connecting section B and the second connecting section B are respectively connected to a first connector and a second connector, and the first connecting section B is provided with the groove.

4. The support device as described in claim 3, characterized in that, A first transition section with a gradually increasing cross-sectional area is provided between the first yielding section and the first connecting section A and the first connecting section B, and a second transition section with a gradually increasing cross-sectional area is provided between the second yielding section and the second connecting section A and the second connecting section B.

5. The support device as described in claim 3, characterized in that, The second connecting section A and the second connecting section B are provided with a first stiffening rib.

6. The support device as described in claim 2, characterized in that, The surfaces of the first and second yield sections are provided with an adhesive material to reduce friction between the first and second yield sections and the inner and outer constraint devices.

7. The support device as described in claim 2, characterized in that, The internal constraint device is a rectangular tube, and two constraint plates are provided on any outer surface of the rectangular tube. A receiving groove for accommodating the first yielding section and the second yielding section is provided between the two constraint plates, and the height of the receiving groove is greater than the height of the first energy-consuming core plate and the second energy-consuming core plate.

8. The support device as described in claim 7, characterized in that, Each inner wall of the rectangular tube is provided with a second stiffening rib that extends along its axial direction.

9. The support device as described in claim 5, characterized in that, The external constraint device includes several external constraint body bodies. The internal constraint device, the first energy-dissipating core plate, and the second energy-dissipating core plate are located in the cavity surrounded by each of the external constraint body bodies. A filling sheet is provided between two adjacent external constraint body bodies, and the height of the filling sheet is greater than the height of the first stiffening rib.

10. The support device as described in claim 3, characterized in that, Both the first connector and the second connector include an I-beam and a connector seat connected to one end of the I-beam. The I-beam is connected to the first connecting segment B and the second connecting segment B.

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