High fatigue-resistant self-centering buckling-restrained brace

Abstract

The application relates to a high fatigue-resistance self-resetting buckling restrained brace, which comprises a support inner core containing an FeSMA energy dissipation section, a fabricated restraint sleeve, a pre-pressed disc spring three-section tooth groove plate, a box-shaped elastic connection section and a node area. Compared with the prior art, the application can realize energy dissipation and shock absorption under small, medium and large earthquakes, and the low-cycle fatigue resistance after a large earthquake still meets the current energy dissipation and shock absorption technical standard without replacement; the support axial prestressed tendon is not needed, the installation and maintenance difficulty is reduced; the reset component is external, and post-earthquake observation and maintenance are convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of civil engineering damping technology, in particular to buckling restrained brace in structural energy dissipation brace, and particularly relates to a high fatigue resistance self-resetting buckling restrained brace. BACKGROUND

[0002] Metal damping technology has the advantages of strong energy dissipation capacity and good environmental adaptability. By dissipating seismic energy through metal plastic deformation, the main structure is free of damage or low damage, and the seismic damage control of the building structure is realized. Self-resetting buckling restrained brace generally combines metal damping with self-resetting technology, uses metal components to dissipate energy, and at the same time uses the resetting force provided by the resetting mechanism to reduce the residual deformation of the energy dissipation component. Limited by low-cycle fatigue resistance, metal energy dissipation components are generally designed to yield and dissipate energy in medium and large earthquakes, and cannot take into account small earthquake energy dissipation. Although the structure can "hardly resist" small earthquakes to meet the requirements of the current seismic design code, it is not difficult to achieve for most structures, but it is less economical. Although there are buckling restrained braces that yield and dissipate energy in small earthquakes, the small energy dissipation components are prone to fracture and exit in large earthquakes, resulting in a decrease in the bearing capacity of the brace, which is not conducive to energy dissipation and seismic mitigation in large earthquakes. On the other hand, after experiencing a strong earthquake, the low-cycle fatigue life of traditional metal energy dissipation components is basically exhausted, which cannot meet the requirements of the current energy dissipation and seismic mitigation technology standards, and needs to be replaced. The replacement process not only has high resource occupation, high energy consumption and high carbon emissions, but also interrupts the use of the building. Therefore, the current metal damping technology based on the idea of "replaceable after an earthquake" cannot guarantee the rapid recovery of the building structure after an earthquake, and does not meet the concept of low-carbon and green development.

[0003] Traditional buckling restrained brace is a typical metal damping component, which is generally composed of a brace core plate, a restraining sleeve and a non-bonding layer (( Figure 1 ), and dissipates seismic energy through plastic deformation of the steel core plate. The plastic strain of the core plate is easily concentrated in the local part and eventually fractured due to the influence of high-order buckling under compression, sleeve friction, etc. ( Figure 2 ). Limited by the physical properties of steel, the steel core plate cannot take into account the multi-level seismic mitigation performance of small, medium and large earthquakes, and it is difficult to meet the requirements of the current energy dissipation and seismic mitigation technology standards after a large earthquake, and the residual deformation of the brace cannot be effectively controlled.

[0004] In order to eliminate the residual plastic deformation of the brace, various self-resetting technologies for buckling restrained braces have been developed, such as nickel-titanium shape memory alloy, prestressed cable, axial ring spring / disk spring group and pre-pressed sliding friction mechanism, etc. Among them, the pre-pressed sliding friction mechanism ( Figure 3 ) has the advantages of low cost, large stiffness and easy installation and maintenance. However, the current sliding friction mechanism adopts a double-toothed groove plate structure, and the tensile / compressive deformation cannot exceed one tooth pitch. The tooth groove slope angle is positively correlated with the resetting force and inversely correlated with the deformation capacity, so it is difficult to balance the resetting capacity and deformation capacity.

[0005] In summary, the existing self-centering buckling restrained brace has two obvious limitations: 1) the low-cycle fatigue resistance of the energy dissipation core plate is insufficient, the yield core plate under small earthquake cannot meet the continuous rupture under large earthquake, and the yield core plate under medium-large earthquake needs to be replaced after large earthquake; 2) the sliding friction reset mechanism has limited deformation capacity and is difficult to balance the reset capacity and deformation capacity. SUMMARY

[0006] The present application aims to overcome the deficiencies of the prior art and provide a high fatigue-resistant self-centering buckling restrained brace, which can ensure that the energy dissipation core plate under small, medium and large earthquakes can dissipate energy and reduce vibration, and even the low-cycle fatigue resistance after the earthquake still meets the current energy dissipation and vibration reduction technical standards without replacement, and has higher self-centering deformation capacity.

[0007] To achieve the object of the present application, the present application provides a high fatigue-resistant self-centering buckling restrained brace, which comprises a support inner core containing an FeSMA energy dissipation section, an assembled restraint sleeve, a pre-pressed disc spring three-section tooth groove plate, a box-shaped elastic connection section and a node area.

[0008] The support inner core containing the FeSMA energy dissipation section comprises an FeSMA energy dissipation section and a cross-shaped adapter plate and a support inner core extension section respectively arranged on both sides of the FeSMA energy dissipation section;

[0009] The node area comprises two cross-shaped sections, one of which is connected with the cross-shaped adapter plate through the box-shaped elastic connection section and fixedly connected with the restraint sleeve, and the other is fixedly connected with the support inner core extension section;

[0010] The restraint sleeve comprises two half sleeves and two sleeve gussets, the two half sleeves are oppositely arranged, one end of the half sleeve is a channel steel stiffener, the rest is a double steel plate stiffener, an opening is formed on the half sleeve and located on the side of the double steel plate stiffener, and the two sleeve gussets are located between the two half sleeves to support the two half sleeves to form a cavity, the support inner core containing the FeSMA energy dissipation section is located in the cavity and can move in the cavity;

[0011] The pre-pressed disc spring three-section tooth groove plate comprises two inner core tooth groove plates, two outer sleeve tooth groove plates, two intermediate tooth groove plates, four pairs of pre-pressed disc spring groups and four pairs of tooth groove cover plates, the two inner core tooth groove plates are fixed on both sides of the support inner core extension section and pass through the openings on the half sleeve, the two outer sleeve tooth groove plates are fixed on both sides of the half sleeve, the intermediate tooth groove plates are located between the inner core tooth groove plates and the outer sleeve tooth groove plates, and gaps are left between the inner core tooth groove plates and the outer sleeve tooth groove plates, tooth groove cover plates are arranged on the upper and lower surfaces of the outer sleeve tooth groove plates, the intermediate tooth groove plates and the inner core tooth groove plates, and are connected by the pre-pressed disc spring groups.

[0012] Further, the cross-shaped adapter plate comprises horizontal plates and vertical plates welded with each other, the horizontal plates are welded with the box-shaped section and are provided with bolt holes for connecting the half sleeves through the splicing plates; the vertical plates are cut into three strips on the side close to the FeSMA energy dissipation section, the outer two strips are provided with bolt holes as the gaskets of the constraint sleeves and serve as the support axial force transmission connectors, and the middle strip is provided with a rectangular notch at the end for welding with the FeSMA energy dissipation section.

[0013] Further, the FeSMA energy dissipation section is a plate with widened two ends and a narrow middle part, the two ends are welded with the cross-shaped adapter plate with notches and the support inner core extension section respectively, and the material is iron-based shape memory alloy, and the length is determined according to the support low-cycle fatigue performance requirement.

[0014] Further, the material of the inner core tooth groove plate is steel, which is welded on the two sides of the support inner core extension section, the middle part of the tooth groove is provided with a long hole for the high-strength bolt to pass through, and the high-strength bolt, the pre-pressed disc spring and the tooth groove cover plate are connected to transmit force.

[0015] Further, the half sleeve is further welded with a connecting plate on the end part of the channel steel stiffening, the connecting plate is provided with a hole for bolt connection with the splicing plate; the half sleeve is provided with a rectangular notch on the end part of the double steel plate stiffening side for the activity of the inner core tooth groove plate; an outer sleeve tooth groove plate is welded at the junction of the channel steel and the double steel plate stiffening rib, the outer sleeve tooth groove plate is provided with a hole for the high-strength bolt to pass through, and the outer sleeve tooth groove plate is also connected to transmit force through the pre-pressed disc spring and the tooth groove cover plate and the middle tooth groove plate.

[0016] Further, the two gaskets are symmetrically distributed between the two half sleeves to support the two half sleeves to form a cavity, thereby providing space for the activity of the support inner core.

[0017] Further, the two pairs of splicing plates are located on the end part of the channel steel stiffening side of the half sleeve, and the support box-shaped section and the constraint sleeve are connected through the friction type high-strength bolt.

[0018] Further, the upper and lower surfaces of the pair of inner core tooth groove plates are tooth groove inclined surfaces, the side surfaces are welded with the support inner core extension section and the joint area, and the middle tooth groove plate is connected through the pre-pressed disc spring group and the two pairs of tooth groove cover plates.

[0019] Further, the upper and lower surfaces of the pair of middle tooth groove plates are tooth groove inclined surfaces, the middle tooth groove plate is connected with the inner core tooth groove plate and the outer sleeve tooth groove plate through the four pairs of pre-pressed disc spring groups, and the outer side of the middle tooth groove plate is further provided with an out-of-plane constraint plate to prevent the three tooth groove plates from being laterally unstable under pressure. The middle tooth groove plate is provided with a gap between the inner core tooth groove plate and the outer sleeve tooth groove plate, and does not directly contact.

[0020] Further, the upper and lower surfaces of the pair of outer sleeve tooth groove plates are tooth groove inclined surfaces, the side surfaces are welded with the constraint sleeve, and the middle tooth groove plate is connected through the pre-pressed disc spring group and the two pairs of tooth groove cover plates.

[0021] Further, the four pairs of pre-pressed disc spring groups are distributed on both sides of the constraint sleeve, and the high-strength screw rod in each pre-pressed disc spring group first passes through a string of disc springs, then passes through the tooth groove cover plate and the intermediate tooth groove plate, and then passes through another string of disc spring groups, and finally the nut is tightened to apply a pre-tightening force to the tooth groove plate.

[0022] Further, the four pairs of tooth groove cover plates are sequentially connected with the inner core tooth groove plate, the intermediate tooth groove plate and the outer sleeve tooth groove plate, and each cover plate has a tooth groove inclined surface on the inner side matched with the tooth groove plate inclined surface, and a flat surface on the outer side matched with the pre-pressed disc spring.

[0023] The box-shaped elastic connection section has an opening at one end for embedding and welding the supporting inner core cross-shaped adapter plate, and the other end is welded to the node area cross-shaped section through the inner wall.

[0024] Further, the node area includes two welded cross-shaped sections, and each section has a screw hole at the tail for connection with the structure (in actual engineering, the screw hole can also be omitted and the structure can be directly welded).

[0025] Compared with the prior art, the present application can at least achieve the following beneficial effects:

[0026] 1. Improve the low-cycle fatigue performance of the buckling restrained brace: The inner core segmented structure of the present application can significantly improve the low-cycle fatigue life of the buckling restrained brace by using FeSMA with high fatigue resistance as the yield energy dissipation section. According to the actual performance requirements, it can be designed to yield and dissipate energy under small, medium and large earthquakes, and even after the earthquake, it still meets the requirements of relevant technical standards without replacement. In addition, the structure of widening the FeSMA at both ends and welding three sides ensures the effective force transmission of different sections, avoiding the adverse effects of welding softening.

[0027] 2. Improve the self-resetting ability of the buckling restrained brace: The pre-pressed disc spring three-section tooth groove plate resetting mechanism of the present application can improve the deformation capacity by one time compared with the existing double-tooth groove plate resetting mechanism, and can better balance the resetting ability and deformation capacity.

[0028] 3. Improve the recoverability of the structure after the earthquake: The high fatigue resistance and self-resetting buckling restrained brace after the earthquake can effectively dissipate the seismic input energy through the cooperation of the energy dissipation component and the resetting component, and the residual deformation of the support member can be recovered after the earthquake without replacement. It is expected to reduce the seismic damage and residual deformation of the main structure, shorten the maintenance time of the structure after the earthquake, and speed up the functional recovery process of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a basic structure diagram of the traditional buckling restrained brace;

[0030] Figure 2 It is a schematic diagram of the compression deformation state, main stress and final fracture of the traditional buckling restrained energy dissipation core plate;

[0031] Figure 3 The figure is a schematic diagram of the sliding friction mechanism of the prior art solution;

[0032] Figure 4 The figure is a schematic diagram of the support as a whole;

[0033] Figure 5 The figure is a schematic diagram of the support disassembled;

[0034] Figure 6 The figure is a schematic diagram of the working principle of the application;

[0035] Figure 7 The figure is a schematic diagram of the support inner core structure;

[0036] Figure 8 The figure is a schematic diagram of the assembled constraint sleeve structure;

[0037] Figure 9 The figure is a schematic diagram of the pre-pressed disc spring three-section tooth groove plate reset mechanism;

[0038] Figure 10 The figure is a schematic diagram of the box-shaped elastic connection section;

[0039] Figure 11 The figure is a schematic diagram of the support node area;

[0040] Wherein, 1-FeSMA energy dissipation section (iron-based shape memory alloy energy dissipation section), 2-cross-shaped adapter plate, 3-support inner core extension section, 4-inner core tooth groove plate, 5-node area, 6-box-shaped elastic connection section, 7-sleeve pad, 8-constraint sleeve, 9-sleeve tooth groove plate, 10-splicing plate, 11-intermediate tooth groove plate, 12-tooth groove cover plate, 13-pre-pressed disc spring group, 21-traditional buckling restrained support core plate, 22-support node plate, 23-traditional buckling restrained support yield section, 24-non-bonding layer, 25-traditional buckling restrained support constraint sleeve, 26-filled mortar or concrete. DETAILED DESCRIPTION

[0041] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0042] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0043] For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] like Figures 4-11 As shown, the present invention provides a high fatigue resistance self-resetting buckling restraint brace, comprising a brace core containing an FeSMA energy dissipation segment. Figure 7 ), prefabricated constraint sleeve ( Figure 8 ), preloaded disc spring three-section toothed plate ( Figure 9 ), box-shaped elastic connection section ( Figure 10 ) and node areas ( Figure 11 ).

[0045] like Figure 7 The supporting core containing the FeSMA energy dissipation section includes a cross-shaped adapter plate 2, the FeSMA energy dissipation section 1, and the supporting core extension section 3. The FeSMA energy dissipation section 1 is a plate that is widened at both ends and narrowed in the middle. Its two ends are welded to the cross-shaped adapter plate 2 with notches and the supporting core extension section 3, respectively.

[0046] The FeSMA energy dissipation section is made of iron-based shape memory alloy, and its length is determined according to the requirements of supporting low-cycle fatigue performance.

[0047] The cross-shaped adapter plate 2 includes a horizontal plate and a vertical plate welded together. The horizontal plate is welded to the box-shaped elastic connecting section 6. In some embodiments of the present invention, bolt holes are provided on the horizontal plate, and slots are provided on the four end faces of the box-shaped elastic connecting section 6 on the side connected to the horizontal plate. The cross-shaped adapter plate 2 is inserted into the four slots respectively, and the horizontal plate extends out of the box-shaped elastic connecting section 6 through the slots and is connected to the splicing plate 10 in the assembled constraint sleeve through the engagement of bolts and screw holes.

[0048] The vertical plate is cut into three strips on the side near the FeSMA energy dissipation section. The two outer strips have bolt holes to serve as pads for the constraint sleeve and as supporting axial force transmission connectors. The middle strip has a rectangular notch at the end to be welded to the FeSMA energy dissipation section.

[0049] The box-shaped elastic connecting section 6 ( Figure 10 One end has a slot for the inner core cross-shaped adapter plate to be embedded and welded, while the other end is welded to the cross-shaped section of the node area through the inner wall.

[0050] like Figure 11As shown, the node area includes two welded cross-shaped segments. In some embodiments of the present invention, each cross-shaped segment has a screw hole at its tail for connection with the structure (in actual engineering, it may be directly welded to the structure without a screw hole).

[0051] The end of the supporting inner core extension section 3 is welded to the plate in the node area.

[0052] In some embodiments of the present invention, the FeSMA energy-dissipating section 1 is welded to the supporting inner core extension section 3 made of ordinary structural steel.

[0053] like Figure 8 The assembled constraint sleeve includes two identical half-sleeves, two sleeve pads 7, two pairs of splicing plates 10, and several connecting bolts. One end of the half-sleeve is reinforced with channel steel, and the remaining part is reinforced with double steel plates. A connecting plate is welded to the end of the half-sleeve on the channel steel reinforcing side. The connecting plate has an opening and is bolted to the splicing plate 10. A rectangular notch is opened at the end of the sleeve on the double steel plate reinforcing side to allow the inner core toothed plate 4 to move. The two sleeve pads 7 are located between the two half-sleeves, symmetrically distributed, supporting the two half-sleeves to form a cavity, thereby providing space for the inner core to move.

[0054] In some embodiments of the present invention, two pairs of splicing plates 10 are located on both sides of the stiffening end of the sleeve channel steel in the half sleeve, and are connected to the support box-shaped elastic connection section and the constraint sleeve by friction-type high-strength bolts.

[0055] The two sleeve halves are spliced ​​together by high-strength bearing bolts to constrain the out-of-plane bending deformation of the inner core. One end of the constraint sleeve 8 is connected to the box-shaped elastic connecting section 6 and the splicing plate by high-strength bolts, and the other end is connected to the three-section toothed groove plate of the preloaded disc spring.

[0056] like Figure 9The pre-pressing disc spring three-section tooth groove plate comprises one pair of inner core tooth groove plates 4, one pair of intermediate tooth groove plates 11, one pair of outer sleeve tooth groove plates 9, four pairs of pre-pressing disc spring groups 13 and four pairs of tooth groove cover plates 12. The outer sleeve tooth groove plate 9 is welded with the half sleeve of the assembled constraint sleeve, the two inner core tooth groove plates 4 are welded on the two sides of the support inner core extension section 3 respectively, the middle part of the inner core tooth groove plate 4 is provided with a long hole for the high-strength bolt to pass through, and the force is transmitted through the high-strength bolt-pre-pressing disc spring and the tooth groove cover plate and the intermediate tooth groove plate. In some embodiments of the present application, the outer sleeve tooth groove plate 9 is welded on the two sides of the intersection of the channel steel and the double-steel plate stiffening rib of the assembled constraint sleeve; the middle part of the outer sleeve tooth groove plate 9 is provided with a hole, and two pairs of disc spring groups are arranged on one side of the half sleeve, one pair of pre-pressing disc spring groups connects the outer sleeve tooth groove plate 9 and the tooth groove cover plate 12 through the hole on the outer sleeve tooth groove plate 9 and applies a pre-tightening force, the other pair of pre-pressing disc spring groups connects the inner core tooth groove plate 4 and the tooth groove cover plate 12 through the hole on the inner core tooth groove plate 4 and applies a pre-tightening force, and the intermediate tooth groove plate 11 is located between the outer sleeve tooth groove plate 9 and the inner core tooth groove plate 4 and is connected with the two pairs of pre-pressing disc spring groups. The four pairs of tooth groove cover plates 12 are sequentially connected with the inner core tooth groove plate 4, the intermediate tooth groove plate 11 and the outer sleeve tooth groove plate 9, the inner side of each cover plate is provided with a tooth groove inclined surface matched with a tooth groove plate inclined surface, and the outer side is a plane matched with the pre-pressing disc spring.

[0057] In some embodiments of the present application, the four pairs of pre-pressing disc spring groups are distributed on the two sides of the assembled constraint sleeve, the high-strength bolt in each pre-pressing disc spring group first passes through a string of disc springs, then passes through the tooth groove cover plate 12 and the intermediate tooth groove plate 11, and then passes through a string of disc springs, and finally the nut is tightened to apply a pre-tightening force to the tooth groove plate.

[0058] In some embodiments of the present application, the material of the inner core tooth groove plate 4 is steel.

[0059] The inner core tooth groove plate 4 and the outer sleeve tooth groove plate 9 are connected through the pre-pressing disc spring group 13 and the two pairs of tooth groove cover plates 12 and the intermediate tooth groove plate 11. In some embodiments of the present application, the side surface of the intermediate tooth groove plate 11 is provided with an out-of-plane constraint plate 14, which can prevent the pre-pressing disc spring three-section tooth groove plate from being damaged by instability under pressure.

[0060] The upper and lower surfaces of the inner core tooth groove plate 4 are tooth groove inclined surfaces, the side surface is welded with the support inner core extension section 3 and the node area 5 Figure 5 , and is connected with the intermediate tooth groove plate 11 through the pre-pressing disc spring group and the two pairs of tooth groove cover plates 12. The inner core tooth groove plate 4 is located in the opening of the half sleeve of the assembled constraint sleeve.

[0061] The upper and lower surfaces of the intermediate tooth groove plate 11 are tooth groove inclined surfaces, and the intermediate tooth groove plate 11 is connected with the inner core tooth groove plate 4 and the outer sleeve tooth groove plate 9 through four pairs of pre-pressing disc spring groups 13, and the outer side of the intermediate tooth groove plate 11 is welded with a baffle to prevent the three-section tooth groove plate from being laterally unstable under pressure.

[0062] The upper and lower surfaces of the outer sleeve tooth groove plate 9 are tooth groove inclined surfaces, the side surface is welded with a constraint sleeve Figure 8 ), and the outer sleeve tooth groove plate 9 is connected with the intermediate tooth groove plate through the pre-pressing disc spring group and two pairs of tooth groove cover plates.

[0063] In the pre-pressing disc spring three-section tooth groove plate, the intermediate tooth groove plate 11 is installed first, then the tooth groove cover plate 12 is installed, and finally the pre-pressing disc spring group is installed, and a pre-tightening force is applied.

[0064] The energy dissipation component of the present application is an iron-based shape memory alloy (FeSMA) which is more resistant to low-cycle fatigue than steel, and the reset component is a pre-pressing disc spring three-section tooth groove plate. Figure 6 As shown in the figure, in the normal use stage, the elastic lateral stiffness of the structure is provided through the cooperative work of the supporting inner core, the pre-pressing disc spring three-section tooth groove plate, the constraint sleeve and the connecting section. In the earthquake stage, the FeSMA energy dissipation section is first put into yield to dissipate seismic energy, and the displacement and acceleration response of the structure are reduced and controlled. When the supporting inner core is deformed relative to the assembled constraint sleeve, the inner core tooth groove plate 4 and the outer sleeve tooth groove plate 9 are forced to deform relative to each other, and the tooth groove cover plate 12 slides along the tooth groove inclined surface, and the pre-pressing disc spring group is further elastically compressed. After the external force is removed, the disc spring group will be elastically reset, and the tooth groove cover plate 12 will return to its original position along the tooth groove inclined surface. This process provides a reset force for the FeSMA core plate. In the post-earthquake recovery stage, through the matching of the reset force parameters of the FeSMA energy dissipation section and the pre-pressing disc spring three-section tooth groove plate, the reset of the structure after the earthquake is realized. The present application utilizes the much higher low-cycle fatigue resistance of FeSMA than steel to ensure that the supporting structure yields and dissipates energy under small, medium and large earthquakes, and even after the earthquake, it still meets the current energy dissipation and seismic mitigation technical standards without the need for replacement. At the same time, the three-section tooth groove plate structure realizes a larger reset deformation capacity.

[0065] The constraint support provided by the embodiment of the present application uses high fatigue-resistant materials, and the metal shock-absorbing component is designed to yield and dissipate energy under small earthquakes to reduce the seismic action, which can first reduce the stiffness and load-bearing capacity requirements of other structural components, thereby reducing the construction cost. Secondly, the high fatigue-resistant energy dissipation component does not break under strong earthquakes, and can provide stable energy dissipation capacity. Thirdly, the high fatigue-resistant energy dissipation component can be designed to still meet the current specifications after the earthquake without the need for replacement, thereby assisting in the realization of rapid recovery of the structure after the earthquake.

[0066] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high fatigue resistant self-centering buckling restrained brace, characterized by, The support inner core containing FeSMA energy dissipation section, the constraint sleeve, the node area, the box-shaped elastic connection section (6) and the three-section tooth groove plate of pre-pressed disc spring, The support inner core containing FeSMA energy dissipation section comprises a FeSMA energy dissipation section (1) and a cross-shaped adapter plate (2) and a support inner core extension section (3) arranged on both sides of the FeSMA energy dissipation section (1) respectively. The node area comprises two cross-shaped sections, one of which is connected with the cross-shaped adapter plate (2) through the box-shaped elastic connection section (6) and fixedly connected with the constraint sleeve, and the other is fixedly connected with the support inner core extension section (3). The constraint sleeve comprises two half sleeves and two sleeve backing plates (7), the two half sleeves are oppositely arranged, one end of the half sleeve is a channel steel stiffener, the rest is a double steel plate stiffener, an opening is formed on the half sleeve and located on the side of the double steel plate stiffener, the two sleeve backing plates (7) are located between the two half sleeves to support the two half sleeves to form a cavity, the support inner core containing FeSMA energy dissipation section is located in the cavity and can move in the cavity. The three-section tooth groove plate of pre-pressed disc spring comprises two inner core tooth groove plates (4), two outer sleeve tooth groove plates (9), two intermediate tooth groove plates (11), four pairs of pre-pressed disc spring groups (13) and four pairs of tooth groove cover plates (12), the two inner core tooth groove plates (4) are fixed on both sides of the support inner core extension section (3) and pass through the openings on the half sleeve, the two outer sleeve tooth groove plates (9) are fixed on both sides of the half sleeve, the intermediate tooth groove plates (11) are located between the inner core tooth groove plates (4) and the outer sleeve tooth groove plates (9) and have gaps with the inner core tooth groove plates (4) and the outer sleeve tooth groove plates (9), the upper and lower surfaces of the outer sleeve tooth groove plates (9), the intermediate tooth groove plates (11) and the inner core tooth groove plates (4) are provided with tooth groove cover plates (12) and connected through the pre-pressed disc spring groups (13).

2. The high fatigue resistant self-centering buckling-restrained brace according to claim 1, wherein, The cross-shaped adapter plate (2) comprises a horizontal plate and a vertical plate, one end of the vertical plate is connected with the FeSMA energy dissipation section (1) and the other end is connected with the horizontal plate, one end of the cross-shaped adapter plate (2) provided with the horizontal plate is inserted with the box-shaped elastic connection section (6) and connected with the constraint sleeve.

3. The high fatigue resistant self-centering buckling-restrained brace according to claim 2, characterized in that, The vertical plate is cut into three strips on the side close to the FeSMA energy dissipation section (1), the outer two strips are provided with bolt holes as the backing plates of the constraint sleeve and act as support axial force transmission connecting members, and the middle strip is provided with an opening at the end to connect with the FeSMA energy dissipation section (1).

4. The high fatigue resistant self-centering buckling-restrained brace according to claim 1, wherein, The constraint sleeve further comprises a splicing plate (10) for connecting and fixing the box-shaped elastic connection section (6) and the half sleeve.

5. The high fatigue resistant self-centering buckling-restrained brace according to claim 1, wherein, The two half sleeves are spliced through high-strength pressure-bearing bolts.

6. The high fatigue resistant self-centering buckling-restrained brace according to claim 1, wherein, The outer sleeve tooth groove plate (9) is arranged on the half sleeve and located at the junction of the channel steel stiffener and the double steel plate stiffener.

7. The high fatigue resistant self-centering buckling-restrained brace according to claim 1, wherein, Holes are formed on the inner core tooth groove plate (4), the outer sleeve tooth groove plate (9) and the intermediate tooth groove plate (11) for high-strength bolts to pass through, pre-pressed disc springs are arranged on the high-strength bolts, and the high-strength bolts, the pre-pressed disc springs and the tooth groove cover plates (12) are connected with the intermediate tooth groove plate (11) to transmit force.

8. The high fatigue resistant self-centering buckling-restrained brace of claim 1, wherein, The upper and lower surfaces of the inner core tooth groove plate (4), the intermediate tooth groove plate (11) and the outer sleeve tooth groove plate (9) are tooth groove inclined surfaces.

9. The high fatigue resistant self-centering buckling-restrained brace of claim 1, wherein, Each pre-pressing disc spring group is provided with a pre-pressing disc spring on the outer side of the two tooth groove cover plates (12).

10. The high-cycle fatigue resistant self-centering buckling-restrained brace according to any one of claims 1-9, characterized in that, The side surface of the intermediate tooth groove plate (11) is provided with an out-of-plane constraint plate (14).

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