I-shaped two-stage yield buckling restrained brace equipment

Abstract

The utility model discloses I-shaped double-stage yield buckling restrained brace equipment which comprises a second-stage I-shaped core plate, first-stage double-opening core plates are connected to the two sides of a web of the second-stage I-shaped core plate, and external restrained channel steel is connected to the sides, away from the second-stage I-shaped core plate, of the first-stage double-opening core plates. And two flange plates of the external constraint channel steel are connected with external constraint flat plates. The buckling restrained brace has double energy dissipation characteristics, the energy dissipation capacity of the buckling restrained brace is effectively improved, and post-earthquake residual deformation of the structure is remarkably reduced; two kinds of energy-consuming core plates are arranged, the energy-consuming mechanism of the core plates is optimized, and the good energy-consuming effect can be achieved under the action of earthquakes of different grades; the bending rigidity and the torsional rigidity of the supporting structure are obviously improved through the symmetrical sections of the second-stage I-shaped core plates, and it is guaranteed that the support can work normally to consume energy under the action of an earthquake.

Description

Technical Field

[0001] This utility model belongs to the technical field of buckling restraint support equipment, specifically relating to an I-shaped double-yield buckling restraint support equipment. Background Technology

[0002] Currently, buckling-restrained braces (BRBs) are mainly divided into energy-dissipating BRBs and load-bearing BRBs. Energy-dissipating BRBs dissipate energy through yielding deformation during earthquakes to protect the structure, while load-bearing BRBs are the main load-bearing components of the structure, serving as the first line of defense against earthquakes. However, existing BRBs have two main drawbacks: firstly, their yield strength and energy dissipation mechanism are fixed, and BRBs designed based on elastic principles with a single yield point can only cope with specific earthquake actions. For earthquakes of different magnitudes, BRBs are insufficient. Secondly, current BRBs rely solely on the core plate for energy dissipation, which is insufficient, resulting in significant residual deformation of the structure after an earthquake. Utility Model Content

[0003] The purpose of this invention is to provide an I-shaped double-stage yield buckling restraint brace, which solves the problems of fixed energy dissipation strength and large residual deformation after earthquake in the prior art.

[0004] The technical solution adopted in this utility model is an I-shaped double-stage yield buckling restraint support device, including a secondary I-shaped core plate, with a primary double-hole core plate connected to both sides of the web of the secondary I-shaped core plate, and an external restraint channel steel connected to the side of the primary double-hole core plate away from the secondary I-shaped core plate, with an external restraint plate connected to both flanges of the external restraint channel steel.

[0005] The features of this utility model also include:

[0006] The secondary I-shaped core plate includes two T-shaped core plates arranged opposite each other, and the primary double-hole core plate is connected to the two sides of the T-shaped core plates located on the same straight line.

[0007] A PTFE plate connects the primary double-hole core plate and the T-shaped core plate.

[0008] The primary double-hole core plate has two sets of first threaded holes on its surface. The two sets of first threaded holes are located near the two ends of the primary double-hole core plate. Each set of first threaded holes is arranged in two parallel rows, with three first threaded holes in each row. The middle of the primary double-hole core plate also has two second threaded holes, which are aligned with the first threaded holes. The first threaded holes are connected to the T-shaped core plate, PTFE plate, and external constraint channel steel through force transmission bolts. The yield section of the primary double-hole core plate has two sets of elliptical holes, each set of elliptical holes located between the first and second threaded holes, with three elliptical holes in each set.

[0009] The web of the T-shaped core plate has a semi-elliptical notch in the middle. The web of the T-shaped core plate is connected to a row of first elongated holes at both ends. The two flanges of the T-shaped core plate are each provided with a semi-elliptical notch in the middle. The PTFE plate has two rows of second elongated holes at both ends, with three holes in each row. The PTFE plate has two third threaded holes in the middle.

[0010] The webs of the two external constraint channel steels are arranged opposite each other. Both flanges of the external constraint channel steels are evenly provided with a number of sixth threaded holes along their length. The sixth threaded holes are connected to the external constraint plate by bolts. Two fourth threaded holes are provided in the middle of the web of the external constraint channel steel. The fourth threaded holes are provided in accordance with the third threaded holes and the second threaded holes. Two parallel strip holes are provided at both ends of the web of the external constraint channel steel. The strip holes are provided in accordance with the first threaded holes.

[0011] The surface of the external constraint plate has two rows of evenly spaced fifth threaded holes along its length, and the fifth threaded holes are connected to the fourth threaded holes by bolts.

[0012] The lengths of the external constraint channel steel, external constraint plate, PTFE plate and T-shaped core plate are all set to 1500mm, and the length of the first-level double-hole core plate is set to 1800mm.

[0013] The beneficial effects of this utility model are:

[0014] This utility model's I-shaped double-stage yield buckling-restrained brace has dual energy dissipation characteristics, effectively improving the energy dissipation capacity of the buckling-restrained brace and significantly reducing the residual deformation of the structure after an earthquake. It arranges two types of energy dissipation core plates, optimizing the energy dissipation mechanism of the core plates, and can achieve good energy dissipation effects under different levels of earthquake action. The symmetrical cross-section of the secondary I-shaped core plate significantly improves the bending stiffness and torsional stiffness of the brace structure, ensuring that the brace can work normally to dissipate energy under earthquake action. Attached Figure Description

[0015] Figure 1This is a structural schematic diagram of the I-shaped double-stage yield buckling restraint support device of this utility model;

[0016] Figure 2 This is a cross-sectional view of the dual-stage core unit in the I-shaped dual-stage yield buckling restraint support device of this utility model;

[0017] Figure 3 This is an overall cross-sectional view of the I-shaped double-stage yield buckling restraint support device of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the first-stage double-hole core plate in the I-shaped double-stage yielding buckling restraint support device of this utility model;

[0019] Figure 5 This is a side view of the first-stage double-hole core plate in the I-shaped double-yield buckling restraint support device of this utility model;

[0020] Figure 6 This is a schematic diagram of the T-shaped core plate 21 in the I-shaped double-stage yield buckling restraint support device of this utility model;

[0021] Figure 7 This is a side view of the T-shaped core plate 21 in the I-shaped double-stage yield buckling restraint support device of this utility model;

[0022] Figure 8 This is a top view of the T-shaped core plate 21 in the I-shaped double-stage yield buckling restraint support device of this utility model;

[0023] Figure 9 This is a schematic diagram of the PTFE plate in the I-shaped double-yield buckling restraint support device of this utility model;

[0024] Figure 10 This is a schematic diagram of the external constraint channel steel in the I-shaped double-stage yield buckling restraint support device of this utility model;

[0025] Figure 11 This is a side view of the external restraint channel steel in the I-shaped double-yield buckling restraint support device of this utility model;

[0026] Figure 12 This is a schematic diagram of the external constraint plate of the I-shaped double-stage yield buckling restraint support device of this utility model.

[0027] In the diagram, 1. Primary double-hole core plate, 2. Secondary I-shaped core plate, 21. T-shaped core plate, 3. External constraint channel steel, 4. External constraint plate, 5. PTFE plate, 6. Strip hole, 7. First threaded hole, 8. Second threaded hole, 9. Third threaded hole, 10. Fourth threaded hole, 11. Fifth threaded hole, 12. Elliptical hole, 13. First oblong hole, 14. Second oblong hole, 15. Sixth threaded hole. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] This utility model provides an I-shaped double-stage yield buckling restraint support device, such as... Figure 1 As shown, the device includes a secondary I-shaped core plate 2. Both sides of the web of the secondary I-shaped core plate 2 are connected to primary double-hole core plates 1. The side of the primary double-hole core plate 1 furthest from the secondary I-shaped core plate 2 is connected to an external constraint channel steel 3. Both flanges of the external constraint channel steel 3 are connected to external constraint flat plates 4. The external constraint flat plate 4 is positioned on one side of the flange of the external constraint channel steel 3. The external constraint flat plate 4 is a rectangular plate that connects the two external constraint channel steels 3 into a single unit. The cross-section has no weakening holes. During device operation, the primary double-hole core plate 1 consumes energy first. When deformation causes the bolt rod to engage with the secondary I-shaped core plate 2, the secondary I-shaped core plate 2 begins to consume energy.

[0030] Example 1

[0031] The I-beam type double-yield buckling restraint brace includes a secondary I-beam core plate 2, with a primary double-hole core plate 1 connected to both sides of the web of the secondary I-beam core plate 2. An external restraint channel steel 3 is connected to the side of the primary double-hole core plate 1 away from the secondary I-beam core plate 2, and an external restraint plate 4 is connected to both flanges of the external restraint channel steel 3.

[0032] like Figure 2 As shown, the secondary I-shaped core plate 2 includes two T-shaped core plates 21 arranged opposite each other, and the primary double-hole core plate 1 is connected to both sides of the T-shaped core plates 21 located on the same straight line. The webs of the two T-shaped core plates 21 are set on the same straight line, together forming the secondary I-shaped core plate 2.

[0033] like Figure 3 As shown, a PTFE plate 5 connects the primary double-perforated core plate 1 and the T-shaped core plate 21. The PTFE plate 5 is a polytetrafluoroethylene plate, which is placed between the T-shaped core plate 21 and the primary double-perforated core plate 1 to reduce friction between the core plates.

[0034] Example 2

[0035] The I-beam type double-yield buckling restraint brace includes a secondary I-beam core plate 2, with a primary double-hole core plate 1 connected to both sides of the web of the secondary I-beam core plate 2. An external restraint channel steel 3 is connected to the side of the primary double-hole core plate 1 away from the secondary I-beam core plate 2, and an external restraint plate 4 is connected to both flanges of the external restraint channel steel 3.

[0036] The secondary I-shaped core plate 2 includes two T-shaped core plates 21 arranged opposite to each other, and the primary double-hole core plate 1 is connected to the two sides of the T-shaped core plates 21 located on the same straight line.

[0037] A PTFE plate 5 connects the primary double-hole core plate 1 and the T-shaped core plate 21.

[0038] like Figure 4-5 As shown, the primary double-hole core plate 1 has two sets of first threaded holes 7 on its surface. These two sets of first threaded holes 7 are located near both ends of the primary double-hole core plate 1, with each set consisting of two parallel rows of three first threaded holes 7. Two second threaded holes 8 are also located in the middle of the primary double-hole core plate 1, aligned with the first threaded holes 7. The first threaded holes 7 are connected to the T-shaped core plate 21, PTFE plate 5, and external constraint channel steel 3 via force transmission bolts. The yield section of the primary double-hole core plate 1 has two sets of elliptical holes 12, each set located between the first threaded holes 7 and the second threaded holes 8, with three holes in each set. The second threaded holes 7 are arranged vertically and connected to the external constraint channel steel 3 via bolts.

[0039] Example 3

[0040] The I-beam type double-yield buckling restraint brace includes a secondary I-beam core plate 2, with a primary double-hole core plate 1 connected to both sides of the web of the secondary I-beam core plate 2. An external restraint channel steel 3 is connected to the side of the primary double-hole core plate 1 away from the secondary I-beam core plate 2, and an external restraint plate 4 is connected to both flanges of the external restraint channel steel 3.

[0041] The secondary I-shaped core plate 2 includes two T-shaped core plates 21 arranged opposite to each other, and the primary double-hole core plate 1 is connected to the two sides of the T-shaped core plates 21 located on the same straight line.

[0042] A PTFE plate 5 connects the primary double-hole core plate 1 and the T-shaped core plate 21.

[0043] The primary double-hole core plate 1 has two sets of first threaded holes 7 on its surface. The two sets of first threaded holes 7 are respectively set near the two ends of the primary double-hole core plate 1. Each set of first threaded holes 7 is arranged in two parallel rows, and the number of first threaded holes 7 in each row is set to three. The primary double-hole core plate 1 also has two second threaded holes 8 in the middle of its surface. The two second threaded holes 8 are set in the same straight line as the first threaded holes 7. The first threaded holes 7 are connected to the T-shaped core plate 21, PTFE plate 5 and external constraint channel steel 3 by force transmission bolts. The yield section of the primary double-hole core plate 1 has two sets of elliptical holes 12. Each set of elliptical holes 12 is set between the first threaded holes 7 and the second threaded holes 8, and each set of elliptical holes 12 has three holes.

[0044] like Figure 6-9 As shown, the web of the T-shaped core plate 21 has a semi-elliptical notch in the middle. A row of first elongated holes 13 are connected to both ends of the web of the T-shaped core plate 21. Semi-elliptical notches are also provided in the middle of the two flanges of the T-shaped core plate 21. Two rows of second elongated holes 14 are provided at both ends of the PTFE plate 5, with three holes in each row. Two third threaded holes 9 are provided in the middle of the PTFE plate 5. The semi-elliptical notch in the middle of the web of the T-shaped core plate 21, and the semi-elliptical notch in the middle of its two flanges, indicate that the yielding section of the web has a semi-elliptical notch for cross-sectional weakening. The second elongated holes 14 of the PTFE plate 5 correspond to the first threaded holes 7. Each T-shaped core plate 21 has three first elongated holes 13, corresponding to one row of first threaded holes 7. Two T-shaped core plates 21 are joined together, corresponding to the two rows of first threaded holes 7 and the two rows of second elongated holes 14.

[0045] Example 4

[0046] The I-beam type double-yield buckling restraint brace includes a secondary I-beam core plate 2, with a primary double-hole core plate 1 connected to both sides of the web of the secondary I-beam core plate 2. An external restraint channel steel 3 is connected to the side of the primary double-hole core plate 1 away from the secondary I-beam core plate 2, and an external restraint plate 4 is connected to both flanges of the external restraint channel steel 3.

[0047] The secondary I-shaped core plate 2 includes two T-shaped core plates 21 arranged opposite to each other, and the primary double-hole core plate 1 is connected to the two sides of the T-shaped core plates 21 located on the same straight line.

[0048] A PTFE plate 5 connects the primary double-hole core plate 1 and the T-shaped core plate 21.

[0049] The primary double-hole core plate 1 has two sets of first threaded holes 7 on its surface. The two sets of first threaded holes 7 are respectively set near the two ends of the primary double-hole core plate 1. Each set of first threaded holes 7 is arranged in two parallel rows, and the number of first threaded holes 7 in each row is set to three. The primary double-hole core plate 1 also has two second threaded holes 8 in the middle of its surface. The two second threaded holes 8 are set in the same straight line as the first threaded holes 7. The first threaded holes 7 are connected to the T-shaped core plate 21, PTFE plate 5 and external constraint channel steel 3 by force transmission bolts. The yield section of the primary double-hole core plate 1 has two sets of elliptical holes 12. Each set of elliptical holes 12 is set between the first threaded holes 7 and the second threaded holes 8, and each set of elliptical holes 12 has three holes.

[0050] The web of the T-shaped core plate 21 has a semi-elliptical notch in the middle. The two ends of the web of the T-shaped core plate 21 are connected to a row of first elongated holes 13. The two flanges of the T-shaped core plate 21 are each provided with a semi-elliptical notch in the middle. The two ends of the PTFE plate 5 are each provided with two rows of second elongated holes 14, and each row of second elongated holes 14 is provided with three holes. The middle of the PTFE plate 5 is provided with two third threaded holes 9.

[0051] like Figure 10-11 As shown, the webs of the two external constraint channel steels 3 are arranged opposite to each other. Both flanges of the external constraint channel steel 3 have several sixth threaded holes 15 evenly spaced along their length. These sixth threaded holes 15 are connected to the external constraint plate 4 by bolts. Two fourth threaded holes 10 are located in the middle of the web of the external constraint channel steel 3, corresponding to the third threaded hole 9 and the second threaded hole 8. Two parallel strip-shaped holes 6 are located at both ends of the web of the external constraint channel steel 3, corresponding to the first threaded hole 7. The groove openings of the two external constraint channel steels 3 are arranged opposite to each other. The two fourth threaded holes 10 are positioned vertically and connected to the third threaded hole 9 and the second threaded hole 8 by bolts. The force-transmitting bolt passing through the first threaded hole 7 passes through the strip-shaped hole 6.

[0052] Example 5

[0053] The I-beam type double-yield buckling restraint brace includes a secondary I-beam core plate 2, with a primary double-hole core plate 1 connected to both sides of the web of the secondary I-beam core plate 2. An external restraint channel steel 3 is connected to the side of the primary double-hole core plate 1 away from the secondary I-beam core plate 2, and an external restraint plate 4 is connected to both flanges of the external restraint channel steel 3.

[0054] The secondary I-shaped core plate 2 includes two T-shaped core plates 21 arranged opposite to each other, and the primary double-hole core plate 1 is connected to the two sides of the T-shaped core plates 21 located on the same straight line.

[0055] A PTFE plate 5 connects the primary double-hole core plate 1 and the T-shaped core plate 21.

[0056] The primary double-hole core plate 1 has two sets of first threaded holes 7 on its surface. The two sets of first threaded holes 7 are respectively set near the two ends of the primary double-hole core plate 1. Each set of first threaded holes 7 is arranged in two parallel rows, and the number of first threaded holes 7 in each row is set to three. The primary double-hole core plate 1 also has two second threaded holes 8 in the middle of its surface. The two second threaded holes 8 are set in the same straight line as the first threaded holes 7. The first threaded holes 7 are connected to the T-shaped core plate 21, PTFE plate 5 and external constraint channel steel 3 by force transmission bolts. The yield section of the primary double-hole core plate 1 has two sets of elliptical holes 12. Each set of elliptical holes 12 is set between the first threaded holes 7 and the second threaded holes 8, and each set of elliptical holes 12 has three holes.

[0057] The web of the T-shaped core plate 21 has a semi-elliptical notch in the middle. The two ends of the web of the T-shaped core plate 21 are connected to a row of first elongated holes 13. The two flanges of the T-shaped core plate 21 are each provided with a semi-elliptical notch in the middle. The two ends of the PTFE plate 5 are each provided with two rows of second elongated holes 14, and each row of second elongated holes 14 is provided with three holes. The middle of the PTFE plate 5 is provided with two third threaded holes 9.

[0058] The webs of the two external constraint channel steels 3 are arranged opposite to each other. Both flanges of the external constraint channel steel 3 are evenly provided with a number of sixth threaded holes 15 along their length. The sixth threaded holes 15 are connected to the external constraint plate 4 by bolts. Two fourth threaded holes 10 are provided in the middle of the web of the external constraint channel steel 3. The fourth threaded holes 10 are provided in correspondence with the third threaded holes 9 and the second threaded holes 8. Two parallel strip holes 6 are provided at both ends of the web of the external constraint channel steel 3. The strip holes 6 are provided in correspondence with the first threaded holes 7.

[0059] like Figure 12 As shown, the surface of the external constraint plate 4 has two rows of evenly spaced fifth threaded holes 11 along its length. The fifth threaded holes 11 are connected to the fourth threaded holes 10 by bolts. The fifth threaded holes 11 correspond to the fourth threaded holes 10.

[0060] Example 6

[0061] The I-beam type double-yield buckling restraint brace includes a secondary I-beam core plate 2, with a primary double-hole core plate 1 connected to both sides of the web of the secondary I-beam core plate 2. An external restraint channel steel 3 is connected to the side of the primary double-hole core plate 1 away from the secondary I-beam core plate 2, and an external restraint plate 4 is connected to both flanges of the external restraint channel steel 3.

[0062] The secondary I-shaped core plate 2 includes two T-shaped core plates 21 arranged opposite to each other, and the primary double-hole core plate 1 is connected to the two sides of the T-shaped core plates 21 located on the same straight line.

[0063] A PTFE plate 5 connects the primary double-hole core plate 1 and the T-shaped core plate 21.

[0064] The primary double-hole core plate 1 has two sets of first threaded holes 7 on its surface. The two sets of first threaded holes 7 are respectively set near the two ends of the primary double-hole core plate 1. Each set of first threaded holes 7 is arranged in two parallel rows, and the number of first threaded holes 7 in each row is set to three. The primary double-hole core plate 1 also has two second threaded holes 8 in the middle of its surface. The two second threaded holes 8 are set in the same straight line as the first threaded holes 7. The first threaded holes 7 are connected to the T-shaped core plate 21, PTFE plate 5 and external constraint channel steel 3 by force transmission bolts. The yield section of the primary double-hole core plate 1 has two sets of elliptical holes 12. Each set of elliptical holes 12 is set between the first threaded holes 7 and the second threaded holes 8, and each set of elliptical holes 12 has three holes.

[0065] The web of the T-shaped core plate 21 has a semi-elliptical notch in the middle. The two ends of the web of the T-shaped core plate 21 are connected to a row of first elongated holes 13. The two flanges of the T-shaped core plate 21 are each provided with a semi-elliptical notch in the middle. The two ends of the PTFE plate 5 are each provided with two rows of second elongated holes 14, and each row of second elongated holes 14 is provided with three holes. The middle of the PTFE plate 5 is provided with two third threaded holes 9.

[0066] The webs of the two external constraint channel steels 3 are arranged opposite to each other. Both flanges of the external constraint channel steel 3 are evenly provided with a number of sixth threaded holes 15 along their length. The sixth threaded holes 15 are connected to the external constraint plate 4 by bolts. Two fourth threaded holes 10 are provided in the middle of the web of the external constraint channel steel 3. The fourth threaded holes 10 are provided in correspondence with the third threaded holes 9 and the second threaded holes 8. Two parallel strip holes 6 are provided at both ends of the web of the external constraint channel steel 3. The strip holes 6 are provided in correspondence with the first threaded holes 7.

[0067] The surface of the external constraint plate 4 has two rows of evenly arranged fifth threaded holes 11 along its length. The fifth threaded holes 11 are connected to the fourth threaded holes 10 by bolts.

[0068] The lengths of the external constraint channel steel 3, external constraint plate 4, PTFE plate 5 and T-shaped core plate 21 are all set to 1500mm, and the length of the first-level double-hole core plate 1 is set to 1800mm.

[0069] The working principle of this utility model's I-beam-shaped double-stage yield buckling restraint support device is as follows:

[0070] Under seismic action, the first-stage double-hole core plate 1 first consumes energy. When the deformation causes the bolt rod to contact the hole wall of the second-stage I-shaped core plate 2, the second-stage I-shaped core plate 2 begins to consume energy. The bolt rod always moves within the strip hole 6 of the external constraint channel steel 3 to ensure continuous energy consumption of the two-stage core plates.

[0071] This utility model of an I-shaped double-stage yield buckling restraint brace device, through its structural design, allows the two core plates to dissipate energy sequentially. This not only solves the problem of fixed yield strength, enabling it to cope with earthquakes of different magnitudes, but also addresses the current problem of insufficient energy dissipation capacity of buckling restraint braces, significantly reducing post-earthquake residual deformation.

Claims

1. An I-beam type double-stage yield buckling restraint brace, characterized in that, It includes a secondary I-shaped core plate (2), and a primary double-hole core plate (1) is connected to both sides of the web of the secondary I-shaped core plate (2). An external constraint channel steel (3) is connected to the side of the primary double-hole core plate (1) away from the secondary I-shaped core plate (2). An external constraint plate (4) is connected to both flanges of the external constraint channel steel (3).

2. The I-beam type double-stage yield buckling restraint support device according to claim 1, characterized in that, The secondary I-shaped core plate (2) includes two T-shaped core plates (21) arranged opposite to each other, and the primary double-hole core plate (1) is connected to the two sides of the T-shaped core plate (21) located on the same straight line.

3. The I-beam-shaped double-stage yield buckling restraint support device according to claim 2, characterized in that, A PTFE plate (5) is connected between the primary double-hole core plate (1) and the T-shaped core plate (21).

4. The I-beam type double-stage yield buckling restraint support device according to claim 1, characterized in that, The first-stage double-hole core plate (1) has two sets of first threaded holes (7) on its surface. The two sets of first threaded holes (7) are respectively set close to both ends of the first-stage double-hole core plate (1). Each set of first threaded holes (7) is arranged in two parallel rows. The number of first threaded holes (7) in each row is set to three. The middle part of the first-stage double-hole core plate (1) also has two second threaded holes (8). The two second threaded holes (8) and the first threaded holes (7) are set in the same straight line. The first threaded holes (7) are connected to the T-shaped core plate (21), PTFE plate (5) and external constraint channel steel (3) by force transmission bolts. The yield section of the first-stage double-hole core plate (1) has two sets of elliptical holes (12). Each set of elliptical holes (12) is set between the first threaded holes (7) and the second threaded holes (8). Each set of elliptical holes (12) has three holes.

5. The I-beam-shaped double-stage yield buckling restraint brace according to claim 4, characterized in that, The web of the T-shaped core plate (21) is provided with a semi-elliptical notch in the middle. The web of the T-shaped core plate (21) is connected to a row of first elongated holes (13) at both ends. The two flanges of the T-shaped core plate (21) are provided with semi-elliptical notches in the middle. The two ends of the PTFE plate (5) are provided with two rows of second elongated holes (14). Each row of second elongated holes (14) is provided with three holes. The middle of the PTFE plate (5) is provided with two third threaded holes (9).

6. The I-beam-shaped double-stage yield buckling restraint support device according to claim 4, characterized in that, The webs of the two external constraint channel steels (3) are arranged opposite to each other. Both flanges of the external constraint channel steel (3) are evenly provided with a number of fourth threaded holes (10) along their length direction. The fourth threaded holes (10) are connected to the external constraint plate (4) by bolts. Two fourth threaded holes (10) are provided in the middle of the web of the external constraint channel steel (3). The fourth threaded holes (10) are provided in correspondence with the third threaded hole (9) and the second threaded hole (8). Two parallel strip holes (6) are provided at both ends of the web of the external constraint channel steel (3). The strip holes (6) are provided in correspondence with the first threaded hole (7).

7. The I-beam-shaped double-stage yield buckling restraint support device according to claim 6, characterized in that, The external constraint plate (4) has two rows of evenly arranged fifth threaded holes (11) along its length direction. The fifth threaded holes (11) are connected to the fourth threaded holes (10) by bolts.

8. The I-beam type double-stage yield buckling restraint support device according to claim 1, characterized in that, The lengths of the external constraint channel steel (3), external constraint plate (4), PTFE plate (5) and T-shaped core plate (21) are all set to 1500mm, and the length of the first-level double-hole core plate (1) is set to 1800mm.

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