A deformation controlled corner brace with external metallic energy dissipler

Abstract

The application discloses a deformation controlled corner brace with external metal energy absorber, which comprises an inner metal rod, an outer metal tube, a standby pull rod system, a connecting plate, a compression elastic pad and an external metal energy absorber. The inner metal rod is inserted into the inner part of the outer metal tube and is connected by the standby pull rod system in the inner part, and is connected by the external metal energy absorber on the outer surface. The inner part of the outer metal tube is provided with the compression elastic pad at the bottom end. The standby pull rod system limits the maximum tensile deformation of the inner metal rod relative to the outer metal tube, and the compression elastic pad reduces the impact of the inner metal rod on the outer metal tube. The application has the beneficial effects that when the structure bears the design expected earthquake effect, the application can dissipate the earthquake energy by the plastic deformation of the external metal energy absorber, when the structure bears the great earthquake effect and the structure deformation is large, the corner brace can be degraded into a force bearing support, the maximum deformation of the structure is limited, the lateral stiffness of the structure is improved, and the anti-collapse performance is improved.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering technology, specifically relating to a deformation-controlled corner brace with an external metal energy dissipator. Technical Background

[0002] In addition to bearing gravity loads, building structures also need to withstand horizontal forces such as seismic and wind loads, thus requiring sufficient lateral stiffness. Frame structures rely on the bending resistance of beam-column joints to provide lateral resistance, but their stiffness is often limited. Therefore, lateral stiffness is generally improved by placing bracing within the structural system. While center-braced frame structures have high lateral stiffness, they are prone to compressive instability under earthquakes, making it difficult to guarantee seismic performance under strong earthquakes. Furthermore, the center-braced frame restricts the deformation of the structural system, preventing the plastic deformation energy of beam-column members from being utilized, which is detrimental to the structure's seismic performance. Therefore, buckling-restrained braces were developed. Buckling-restrained braces avoid the compressive instability phenomenon of ordinary braces, possessing approximately the same tensile and compressive properties, and can stably dissipate energy under seismic loads. In addition, scholars have proposed eccentrically braced frames and corner-braced frame structural systems. These systems organically combine the stiffness advantages of center-braced frame structures with the deformation advantages of frame systems through eccentric bracing, while also offering good economic benefits, showing broad application prospects in multi-story and high-rise steel structure systems.

[0003] Generally speaking, buckling-restrained braces (BRBs) have high load-bearing capacity but cannot dissipate energy under minor earthquakes. Their large size makes construction and installation inconvenient, occupying building space. Applying them to engineering structures can affect the normal functionality of buildings to some extent, and they also increase structural stiffness, amplifying seismic loads and acceleration responses. Their application is limited in engineering structures containing precision instruments. With the continuous development of resilient seismic design, the post-earthquake repairability of building structures is receiving increasing attention. However, because the compression core of a BRB is encased, repairing it is not feasible; post-earthquake repair would require replacing the entire BRB, which is uneconomical.

[0004] In recent years, small metal energy dissipators with compact size and low load-bearing capacity have been proposed. These energy dissipators are mainly placed in the joint area. Due to their low load-bearing capacity, these energy dissipators can dissipate energy even under minor earthquakes without significantly increasing structural stiffness, and they are also easy to repair after an earthquake. However, because small metal energy dissipators reach the yield state relatively early, the plastic development of the energy dissipators is significant under major earthquakes. On the one hand, small metal energy dissipators may fracture prematurely due to excessive deformation. On the other hand, the stiffness of small metal energy dissipators in the deep plastic stage is relatively low, which cannot effectively improve the lateral stiffness of the structural system, leading to the failure of weak layers or even collapse under the second-order gravity effect. Summary of the Invention

[0005] The present invention aims to propose an energy dissipation corner brace that can be used in corner brace-frame structures. This corner brace has a simple construction, is easy to repair after an earthquake, and has controllable deformation, so as to solve the problems of difficult post-earthquake repair of buckling-restrained braces and unreliable performance of traditional small dampers in large earthquakes in the above-mentioned technical background.

[0006] Therefore, the present invention provides a deformation-controlled corner brace with an external metal energy dissipator. This corner brace is mainly used in corner brace-frame structure systems to increase the stiffness and energy dissipation capacity of frame nodes. It can dissipate energy even under minor earthquakes, reduce seismic damage to the structure, and the corner brace is easy to repair after an earthquake. It has the advantages of low cost and easy replacement after an earthquake.

[0007] To achieve the above objectives, the present invention provides a deformation-controlled corner brace with an external metal energy dissipator, comprising: an inner metal rod, an outer metal tube, and an external metal energy dissipator; the inner metal rod is inserted into the outer metal tube, and the external metal energy dissipator comprises an inner energy dissipation rod, an outer constraint sleeve, and a gap filling tube; the inner energy dissipation rod is wrapped around the gap filling tube and then passes through the outer constraint sleeve. Its further characteristic is that:

[0008] It also includes a spare tie rod system, a pressure-bearing elastic pad, and a connecting plate. The inner metal rod is inserted into the outer metal tube, and the internal space is connected by the spare tie rod system. A pressure-bearing elastic pad is fixed at the bottom of the inner cavity of the outer metal tube. The inner metal rod and the outer metal tube are connected on at least two opposing outer surfaces by an external metal energy dissipator.

[0009] The inner metal rod includes a metal rod body, a secondary connecting end, a secondary connecting end plate, and a sealing end plate. One end of the metal rod body is fixedly connected to the secondary connecting end plate and the secondary connecting end, and the other end is fixedly connected to the sealing end plate. Secondary stiffening plates are provided on at least two opposite outer surfaces of the metal rod body. The metal rod body is also fixedly connected to a connecting plate. The position of the connecting plate on the metal rod body can be set as needed. If necessary, the connecting plate and the secondary connecting end plate are the same object. Within the length range from the connecting plate to the sealing end plate, the cross-sectional shape of the metal rod body is rectangular.

[0010] The main body of the outer metal tube is a rectangular steel tube with a main connecting end and a main connecting end plate at one end and an open state at the other end. Main stiffening plates are provided on at least two opposite outer surfaces of the rectangular steel tube; and pressure-bearing elastic pads are provided at the bottom of the rectangular steel tube.

[0011] The spare tie rod system includes nut fasteners, rigid tie rods, and elastic components; the spare tie rod system is used to connect the main connecting end plate and the connecting plate. The length of the rigid tie rod is greater than the maximum surface distance between the main connecting end plate and the connecting plate, and elastic components are built into the redundant length range.

[0012] The external metal energy dissipator is connected to the secondary stiffening plate and the main stiffening plate at both ends by large nuts. To ensure rapid disassembly and replacement of the external metal energy dissipator after an earthquake, at least one of the secondary stiffening plate and the main stiffening plate has a U-shaped notch.

[0013] The pressure-bearing elastic pad is a highly elastic device mainly used to mitigate the impact of the inner metal rod on the outer metal tube when the corner brace is under pressure. The pressure-bearing elastic pad consists of a pressure-bearing end plate, an elastic body, and a metal guide rod, and is connected to the main connecting end plate by nuts and fasteners.

[0014] This invention is applicable to corner brace-support frame systems, and its working principle and achievable beneficial effects are as follows:

[0015] Under seismic loading, the deformation of the structural system causes the inner metal rods to move relative to the outer metal tubes. The external metal energy dissipator bears the load and is the main energy-dissipating component of this invention. It has a low load-bearing capacity and yields to dissipate energy even under minor earthquakes. In addition, at least one of the secondary stiffening plate and the main stiffening plate has a U-shaped notch, which makes the external metal energy dissipator easy to disassemble. Furthermore, the post-earthquake repair of the structure is very convenient.

[0016] Furthermore, the beneficial effects are explained by dividing the corner bracing into tension and compression:

[0017] Firstly, when the structure deforms under seismic loads, the inner metal rod separates from the outer metal tube when the corner brace is under tension. Since the length of the spare tie rod system in this technical solution is greater than the maximum surface distance between the main connecting end plate and the connecting plate, it has redundant length, which is filled by the elastic component. The corner brace under tension causes the elastic component to undergo compressive deformation, but due to its low stiffness, the spare tie rod system is subjected to a small force, and the external load is almost entirely borne by the external metal energy dissipator. At this stage, the mechanical performance of the corner brace is basically no different from that of the external metal energy dissipator. The internal force generated by the compression of the elastic component is transmitted to the inner metal rod and the outer metal tube through the rigid tie rod, which improves the tensile bearing capacity of the corner brace to a certain extent and compensates for the pressure increase effect caused by the Poisson effect and friction of the external metal energy dissipator. Because the compressible space of the elastic component is limited, when the structure is subjected to strong earthquakes, if the tensile deformation of the inner metal rod relative to the outer metal tube exceeds the reserved value, the elastic component will be completely compressed and unable to undergo further compressive deformation. The separation movement of the inner metal rod relative to the outer metal tube will be restricted by the rigid tie rod, and the rigid tie rod will enter the load-bearing state. A tensile deformation control mechanism composed of the inner metal rod, connecting plate, spare tie rod system, and main connecting end plate is formed, and the tensile deformation of the corner brace is controlled, effectively protecting the external metal energy dissipator. At the same time, because the tensile bearing capacity and stiffness of the corner brace are improved, the occurrence of weak layers in the structure can be suppressed, and the collapse resistance of the structure can be improved.

[0018] Secondly, when the structure is subjected to seismic forces causing the corner braces to be compressed, the inner metal rods undergo compressive movement relative to the outer metal tubes. Due to the presence of the internal cavity of the outer metal tube, the external metal energy dissipator can first enter the compressive energy dissipation state. When the seismic forces on the structure further increase, and the compressive deformation of the inner metal rods relative to the outer metal tubes exceeds the reserved value, the internal cavity of the outer metal tube disappears, and the sealing end plate begins to contact the compressive elastic pad. Due to the large bearing capacity and stiffness of the compressive elastic pad, a portion of the external load is directly transferred to the main connecting end plate through the compressive elastic pad. The compressive deformation control mechanism composed of the inner metal rods, the compressive elastic pad, and the main connecting end plate is formed, the compressive deformation of the corner braces is controlled, effectively protecting the external metal energy dissipator. At the same time, the compressive bearing capacity and stiffness of the corner braces are improved, suppressing the occurrence of weak layers in the structure and enhancing the structure's resistance to collapse. Because the elastic body in the compression elastic pad can undergo compressive deformation, the compression elastic pad possesses a certain deformation capacity along the corner support axis. This mitigates the impact effect of the inner metal rod on the outer metal tube and reduces the stiffness of the compressive deformation control mechanism to a certain extent, further balancing its stiffness difference with the tensile deformation control mechanism. Through proper design, the stiffness of the tensile deformation control mechanism and the compressive deformation mechanism can be made equal. Attached Figure Description

[0019] Figure 1 This is a front view of the deformation-controlled corner brace with an external metal energy dissipator in an embodiment.

[0020] Figure 2 This is a top view of a deformation-controlled corner brace with an external metal energy dissipator, as shown in the embodiment.

[0021] Figure 3 A front view of the inner metal rod provided for an embodiment;

[0022] Figure 4 A front view of the outer metal tube provided for an embodiment;

[0023] Figure 5 -a is a schematic diagram of the external metal energy dissipator and its connection provided in the embodiment;

[0024] Figure 5 -b is a schematic diagram of the secondary stiffening plate provided in the embodiment;

[0025] Figure 5 -c is a schematic diagram of the main stiffening plate provided in the embodiment;

[0026] Figure 6 The backup tie rod system provided for the embodiment;

[0027] Figure 7 This is a perspective view of the compressed elastic pad in the embodiment;

[0028] Figure 8This is a schematic diagram of the deformation-controlled corner brace product of the present invention and its typical application scenarios provided in the embodiments;

[0029] Figure 9 This is a schematic diagram illustrating the working principle of the embodiment;

[0030] Figure 10 This is a schematic diagram of the force-displacement curve of an embodiment;

[0031] In the diagram: 1. Inner metal rod; 11. Main body of metal rod; 12. Secondary connection end; 13. Secondary connection end plate;

[0032] 14th stiffening plate; 141st stiffening plate (longitudinal); 142nd stiffening plate (transverse); 143rd U-shaped notch; 15th sealing end plate;

[0033] 2. Outer metal tube; 21. Rectangular steel tube; 22. Main connecting end; 23. Main connecting end plate; 24. Main stiffening plate;

[0034] 241 Main stiffening plate longitudinal plate; 242 Main stiffening plate transverse plate; 243 Circular notch;

[0035] 3. External metal energy dissipator; 31. Internal energy dissipation rod; 32. External constraint sleeve; 33. Gap filling tube; 34. Large nut;

[0036] 4. Backup tie rod system; 41. Rigid tie rod; 42. Flexible component;

[0037] 5. Compression elastic pad; 51. Compression end plate; 52. Elastomer; 53. Metal guide rod;

[0038] 6 connecting plates;

[0039] 7. Nut fasteners;

[0040] 8 frame beams;

[0041] 9 frame columns. Detailed Implementation

[0042] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0043] like Figure 1 and Figure 2 As shown, a deformation-controlled corner brace with an external metal energy dissipator according to the present invention includes an inner metal rod 1, an outer metal tube 2, an external metal energy dissipator 3, a spare tie rod system 4, a pressure-bearing elastic pad 5, and a connecting plate 6. The inner metal rod 1 is inserted into the outer metal tube 2, and the internal space is connected by the spare tie rod system 4. A pressure-bearing elastic pad 5 is fixed at the bottom of the inner cavity of the outer metal tube 2. The inner metal rod 1 and the outer metal tube 2 are connected on their upper and lower opposing outer surfaces by the external metal energy dissipator 3.

[0044] like Figure 3As shown, the inner metal rod 1 consists of a metal rod body 11, a secondary connecting end 12, a secondary connecting end plate 13, and a sealing end plate 15. Preferably, the metal rod body 11 is a rectangular cross-section hollow steel pipe, with the secondary connecting end 12 and the secondary connecting end plate 13 welded to one end, and the sealing end plate 15 welded to the other end. Secondary stiffening plates 14 are welded to the upper and lower opposing outer surfaces. A connecting plate 6 is welded inside the metal rod body 11. Preferably, the connecting plate 6 and the secondary stiffening plate 14 are positioned in the same axial direction on the metal rod body 11.

[0045] like Figure 4 As shown, the outer metal tube 2 is made of rectangular steel tube 21, with a main connecting end 22 and a main connecting end plate 23 welded to one end, and the other end is open. Main stiffening plates 24 are welded to the upper and lower opposite outer surfaces of the rectangular steel tube 21. A pressure-bearing elastic pad 5 is provided at the bottom of the rectangular steel tube 21.

[0046] like Figure 5 As shown in -a, a typical external metal energy dissipator 3 includes an inner energy dissipation rod 31, an outer constraint sleeve 32, and a gap filling tube 33. The inner energy dissipation rod 31 is wrapped around the gap filling tube 33 and then passes through the outer constraint sleeve 32. The inner energy dissipation rod 31 is weakened in the middle and tapped at both ends; preferably, the inner energy dissipation rod 31 is made of low yield point steel bar. Further, the two ends of the external metal energy dissipator 3 are connected to the secondary stiffening plate 14 and the main stiffening plate 24 by large nuts 34. To facilitate disassembly, at least one of the secondary stiffening plate 14 and the main stiffening plate 24 has a U-shaped notch. The secondary stiffening plate 14 provided in the embodiment is as follows: Figure 5 As shown in -b, it includes a secondary stiffening plate longitudinal plate 141 and a secondary stiffening plate transverse plate 142, with a U-shaped notch 143 formed on the secondary stiffening plate transverse plate 142. The main stiffening plate 24 provided in the embodiment is as follows: Figure 5 As shown in -c, it includes a main stiffening plate longitudinal plate 241 and a main stiffening plate transverse plate 242, with a circular notch 243 on the main stiffening plate transverse plate 242.

[0047] Furthermore, such as Figure 6 As shown, the spare tie rod system 4 consists of a nut fastener 7, a rigid tie rod 41, and an elastic component 42. The spare tie rod system 4 passes through the metal rod body 11 before being welded to the secondary connecting end 12 and the secondary connecting end plate 13, and then the spare tie rod system 4 is connected to the main connecting end plate 23. The length of the rigid tie rod 41 needs to be greater than the maximum surface distance between the main connecting end plate 23 and the connecting plate 6. The elastic component 42 is placed within the excess length of the rigid tie rod 41. A low-load-bearing spring is generally suitable as the elastic component 42.

[0048] Furthermore, combined with Figure 4 and Figure 7The pressure-bearing elastic pad 5 consists of a pressure-bearing end plate 51, an elastic body 52, and a metal guide rod 53. The elastic body 52 is generally a high-strength spring or a disc spring; the metal guide rod 53 passes through the elastic body 52 and then through the main connecting end plate 23, and is then connected to the main connecting end plate 23 by a nut fastener 7.

[0049] Typical applications of this invention in construction include: Figure 8 As shown, it is used to connect frame beam 8 and frame column 9. Under seismic loading, the deformation of the main frame structure will cause deformation of the corner braces. Depending on the different stress modes, the present invention has different mechanical responses, and its working mechanism is as follows: Figure 9 As shown, specifically:

[0050] Firstly, under seismic loading, when the structural system deforms and the corner braces are under tension, the inner metal rod 1 separates from the outer metal tube 2, and the external metal energy dissipator 3 undergoes tensile deformation, thus entering a yielding energy dissipation state and consuming seismic energy. Since the length of the spare tie rod system 4 in the embodiment is greater than the maximum surface distance between the main connecting end plate 23 and the connecting plate 6, it has redundant length, and this redundant length is filled by the elastic component 42. When the tensile deformation of the corner brace does not exceed the reserved distance y1 (see... Figure 9 -c) During this stage, the elastic component 42 undergoes compressive deformation. However, due to its low stiffness, the backup tie rod system 4 experiences relatively low stress, and the external load is almost entirely borne by the external metal energy dissipator 3. At this stage, the mechanical performance of the corner brace is essentially the same as that of the external metal energy dissipator 3. The internal force generated by the compression of the elastic component 42 is transmitted to the inner metal rod 1 and the outer metal tube 2 through the rigid tie rod 41, which to some extent increases the tensile bearing capacity of the corner brace and compensates for the increased pressure effect caused by the Poisson effect and friction of the external metal energy dissipator 3. The tensile force-displacement response of the corner brace at this stage corresponds to... Figure 10 -a is the curve before the displacement is less than y1. When the tensile deformation of the corner brace continues to increase, that is, exceeding the reserved distance y1 (see curve),... Figure 9 -c), at this point, the elastic component 42 is completely compressed and cannot deform further. The length of the elastic component changes from its original length l0 to l1 (see...). Figure 9 -a、 Figure 9 -c). The separation motion of the inner metal rod 1 relative to the outer metal tube 2 is limited by the inherent length of the rigid tie rod 41. Due to the large stiffness and load-bearing capacity of the rigid tie rod 41, it begins to bear part of the tensile force of the corner brace, thus increasing the stiffness and load-bearing capacity of the corner brace. The deformation at this stage corresponds to... Figure 10 -a is the curve after the displacement exceeds y1.

[0051] Secondly, under seismic loading, when the structural system deforms and the corner braces are compressed, the inner metal rod 1 undergoes compressive motion relative to the outer metal tube 2. Due to the presence of the cavity inside the outer metal tube 2, the external metal energy dissipator 3 can first enter the state of compressive energy dissipation. The force-displacement response of the corner brace under compression in this stage corresponds to... Figure 10 -b represents a curve where the displacement does not exceed y2. When the seismic load on the structure further increases, the compressive deformation of the inner metal rod 1 relative to the outer metal tube 2 exceeds the predetermined value y2 (see...). Figure 9 -a) The internal cavity of the outer metal tube 2 disappears, and the sealing end plate 15 begins to contact the pressure-bearing elastic pad 5. Due to the large bearing capacity and stiffness of the pressure-bearing elastic pad 5, a pressure deformation control mechanism composed of the inner metal rod 1, the pressure-bearing elastic pad 5, and the main connecting end plate 23 is formed. The pressure deformation of the corner brace is controlled, effectively protecting the external metal energy dissipator 3. At the same time, the compressive bearing capacity and stiffness of the corner brace are improved, suppressing the appearance of weak layers in the structure and improving the structure's resistance to collapse. The deformation at this stage corresponds to Figure 10 -b is the curve after the displacement exceeds y2. Since the elastic body 52 in the compressed elastic pad 5 can undergo compressive deformation, the compressed end plate 51 can move a certain distance along the direction of the metal guide rod 53. The impact effect of the inner metal rod 1 on the outer metal tube 2 is alleviated, and the stiffness of the compressive deformation control mechanism is reduced to a certain extent, further balancing the stiffness difference between it and the tensile deformation control mechanism. Through reasonable design, the stiffness of the tensile deformation control mechanism and the compressive deformation mechanism can be made equal.

Claims

1. A deformation-controlled corner brace with an external metal energy dissipator, comprising an inner metal rod (1), an outer metal tube (2), and an external metal energy dissipator (3); the inner metal rod (1) is inserted into the outer metal tube (2), and the external metal energy dissipator (3) comprises an inner energy dissipation rod (31), an outer constraint sleeve (32), and a gap filling tube (33), wherein the inner energy dissipation rod (31) wraps around the gap filling tube (33) and then passes through the outer constraint sleeve (32), characterized in that: It also includes a spare tie rod system (4), a pressure-bearing elastic pad (5) and a connecting plate (6); the inner metal rod (1) and the inner space of the outer metal tube (2) are connected through the spare tie rod system (4), and a pressure-bearing elastic pad (5) is fixed at the bottom of the inner cavity of the outer metal tube (2); the inner metal rod (1) and the outer metal tube (2) are connected at least two opposing outer surfaces through an external metal energy dissipator (3); The main body of the outer metal tube (2) is a rectangular steel tube (21), with a main connecting end (22) and a main connecting end plate (23) at one end, and the other end is open. At least two opposite outer surfaces of the rectangular steel tube (21) are provided with main stiffening plates (24). The backup tie rod system (4) includes a nut fastener (7), a rigid tie rod (41), and an elastic component (42); the backup tie rod system (4) is used to connect the main connecting end plate (23) and the connecting plate (6).

2. The deformation-controlled corner brace with an external metal energy dissipator according to claim 1, characterized in that: The main body of the inner metal rod (1) is a metal rod body (11), with a secondary connecting end (12) and a secondary connecting end plate (13) at one end and a sealing end plate (15) at the other end. At least two opposite outer surfaces of the metal rod body (11) are provided with secondary stiffening plates (14). The connecting plate (6) is fixedly connected to the metal rod body (11). Within the length range from the connecting plate (6) to the sealing end plate (15), the cross-sectional shape of the metal rod body (11) is rectangular.

3. The deformation-controlled corner brace with an external metal energy dissipator according to claim 1, characterized in that: The cross-sectional dimensions of the metal rod body (11) of the inner metal rod (1) are smaller than the cross-sectional dimensions of the internal cavity of the rectangular steel tube (21) of the outer metal tube (2). One end of the metal rod body (11) with the sealing end plate (15) is inserted into the interior of the outer metal tube (2).

4. The deformation-controlled corner brace with an external metal energy dissipator according to claim 1, characterized in that: The main body of the inner metal rod (1) is the metal rod body (11), and the connecting plate (6) is fixedly connected to the metal rod body (11). Its position on the metal rod body (11) can be set as needed.

5. The deformation-controlled corner brace with an external metal energy dissipator according to claim 1, characterized in that: The pressure-bearing elastic pad (5) consists of a pressure-bearing end plate (51), an elastic body (52), and a metal guide rod (53), and is connected to the main connecting end plate (23) by a nut fastener (7).

6. The deformation-controlled corner brace with an external metal energy dissipator according to claim 1, characterized in that: The external metal energy dissipator (3) is connected to the secondary stiffening plate (14) and the main stiffening plate (24) by a large nut (34), and at least one of the secondary stiffening plate (14) and the main stiffening plate (24) has a U-shaped notch.

7. The deformation-controlled corner brace with an external metal energy dissipator according to any one of claims 1 to 6, characterized in that: The length of the spare tie rod system (4) is greater than the maximum surface distance between the main connecting end plate (23) and the connecting plate (6), and it has a redundant length, which is filled by the elastic component (42).

8. The deformation-controlled corner brace with an external metal energy dissipator according to claim 7, characterized in that: Its working mechanism includes: Firstly, under seismic action, when the structural system deforms and the corner brace is under tension, the inner metal rod (1) moves apart from the outer metal tube (2), and the external metal energy dissipator (3) undergoes tensile deformation, thus entering a yielding energy dissipation state and consuming seismic energy; when the corner brace's tensile deformation does not exceed the reserved distance y1, the elastic component (42) undergoes compressive deformation, its stiffness is small, the spare tie rod system (4) is under small force, and the external load is borne by the external metal energy dissipator (3). At this stage, the mechanical properties of the corner brace are the same as those of the external metal energy dissipator (3); the internal force generated by the compression of the elastic component (42) is transmitted through the rigid tie rod (41) The force is transmitted to the inner metal rod (1) and the outer metal tube (2) to compensate for the increased pressure effect of the external metal energy dissipator (3); when the tensile deformation of the corner brace continues to increase and exceeds the reserved distance y1, the elastic component (42) is completely compressed and cannot further develop deformation. At this time, the length of the elastic component changes from the original length l0 to l1; the separation movement of the inner metal rod (1) relative to the outer metal tube (2) is limited by the inherent length of the rigid tie rod (41). Since the rigid tie rod (41) has a large stiffness and bearing capacity, the rigid tie rod (41) begins to bear part of the tension of the corner brace, and the stiffness and bearing capacity of the corner brace are improved. Secondly, under seismic action, when the structural system deforms and the corner braces are compressed, the inner metal rod (1) undergoes compression relative to the outer metal tube (2). Due to the presence of the cavity inside the outer metal tube (2), the external metal energy dissipator (3) can first enter the state of compression and energy dissipation. When the seismic action on the structure further increases, the compression deformation of the inner metal rod (1) relative to the outer metal tube (2) exceeds the reserved value y2, the cavity inside the outer metal tube (2) disappears, and the sealing end plate (15) and the compressed elastic pad (5) begin to contact. Due to the large bearing capacity and stiffness of the compressed elastic pad (5), the inner metal rod (1), the compressed elastic pad (5), and the main connecting The compression deformation control mechanism formed by the end plate (23) is formed, the compression deformation of the corner brace is controlled, and the external metal energy dissipator (3) is effectively protected. At the same time, the compressive bearing capacity and stiffness of the corner brace are improved, the occurrence of weak layers in the structure is suppressed, and the collapse resistance of the structure is improved. Since the elastic body (52) in the compression elastic pad (5) can undergo compression deformation, the compression end plate (51) can move a certain distance along the direction of the metal guide rod (53). The impact effect of the inner metal rod (1) on the outer metal tube (2) is alleviated, and the stiffness of the compression deformation control mechanism is reduced to a certain extent, further balancing the stiffness difference between it and the tensile deformation control mechanism.

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