Self-resetting buckling-restrained brace structure based on double-order disc springs

Abstract

The utility model discloses a self-resetting buckling-restrained brace structure based on a double-order disc spring, which relates to the field of building structure reinforcement and comprises a core unit, constraint cushion blocks are arranged on the upper side and the lower side of the core unit, and zigzag connecting parts are arranged at the positions where the core unit is contacted with the constraint cushion blocks. An outer restraining unit is arranged on the periphery of the outer portion of the core unit, the outer restraining unit comprises a left-right restraining unit and a front-back restraining unit, the front-back restraining unit is a front-back restraining steel plate, and the left-right restraining unit and the front-back restraining unit are each provided with a deep groove. The method has the advantages that the risk of permanent deformation is reduced, the buckling phenomenon is effectively prevented, and the method is applied to existing structures which do not meet anti-seismic standard requirements or newly-built frame structures of which the use functions are changed, so that the bearing capacity and anti-seismic performance of the original frame structures are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of building structure reinforcement, and specifically relates to a self-resetting buckling-restrained brace structure based on double-stage disc springs. BACKGROUND

[0002] Buckling restrained brace (BRB) is an effective energy dissipation component, and is generally composed of three parts, i.e., a core unit, an outer restraint unit, and unbonding material between the core unit and the outer restraint unit. The traditional BRB has some defects, such as high manufacturing cost, large self-weight due to the use of thick and heavy materials as the restraint cover, performance degradation due to environmental factors (e.g., corrosion) during long-term service, and difficulty in installation in some space-limited application scenarios. The root cause of these problems lies in that the design concept and technical implementation of the traditional BRB do not fully consider the balance between economic benefits, lightweight requirements, long-term stability, and installation convenience.

[0003] In the prior art, buckling restraint measures are added to overcome the problem of local yielding of the energy dissipation metal core of the buckling brace during compression, to provide the structure with symmetric energy dissipation capacity in tension and compression, and to avoid serious damage to the structure under the action of an earthquake to some extent by using the plastic deformation capacity of the energy dissipation metal. However, the existing buckling restrained brace installed structure has a large residual displacement after an earthquake, which affects the function of the structure. SUMMARY

[0004] The utility model aims at providing a self-resetting buckling-restrained brace structure based on double-stage disc springs to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A self-resetting buckling-restrained brace structure based on double-stage disc springs, comprising a core unit, wherein the core unit is provided with restraint pads on both upper and lower sides, the core unit is provided with a sawtooth-shaped connecting part at a position in contact with the restraint pads, the core unit is provided with an outer restraint unit around the outside, the outer restraint unit comprises left and right restraint units and front and rear restraint units, the front and rear restraint units are front and rear restraint steel plates, the left and right restraint units and the front and rear restraint units are both provided with deep grooves, and the restraint units are combined together by friction and mechanical interlocking force and constrain the core unit.

[0007] The left and right constraint units comprise left and right outer constraint steel plates, the left and right outer constraint steel plates are arranged at the two outer sides of the core unit respectively, the side away from each other of the left and right outer constraint steel plates is provided with a stiffened rib steel plate, one end of the stiffened rib steel plate is provided with an end steel plate, the outer side of the end steel plate is provided with a support steel plate, a plurality of connecting bolts are arranged on the side wall of the support steel plate, one end of the connecting bolt is provided with a movable plate, the side wall of the movable plate is provided with a connecting plate, and a spring is arranged between the support steel plate and the movable plate.

[0008] Based on the above technical scheme, the utility model further provides the following optional technical schemes.

[0009] In an optional scheme, the constraint pad comprises upper and lower outer constraint pads, and the upper and lower outer constraint pads are provided with sawtooth grooves on the outer sides.

[0010] In an optional scheme, a plurality of circular holes are formed in the core unit, the distance between the circular holes and the end of the core unit is 35mm, the interval between each circular hole is 10mm, and the diameters of the circular holes are 10mm, 15mm, 20mm and 25mm in sequence.

[0011] In an optional scheme, a plurality of screw holes are formed in the stiffened rib steel plate.

[0012] In an optional scheme, a plurality of bolt holes are formed in the outer sides of the upper and lower outer constraint pads.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The fractal self-resetting buckling-restrained brace test piece of the double-stage disc spring combines the advanced concepts of fractal geometry, material science and structural mechanics, realizes an efficient energy absorption and release mechanism, uses elastic materials and a unique double-stage disc spring structure to ensure that the brace can automatically return to the initial position after experiencing large deformation, has excellent self-resetting capability, reduces the risk of permanent deformation, effectively prevents the occurrence of buckling, reduces the influence of external impact on the main structure through the efficient energy dissipation mechanism, and is applied to existing structures that do not meet the requirements of the seismic code or newly-built frame structures that change the use function, so as to improve the bearing capacity and seismic performance of the original frame structure.

[0015] 2. The optimized design realizes efficient buckling resistance, greatly reduces the self-weight by means of light materials and compact structure design, reduces the requirement for foundation bearing capacity, simplifies the production process, effectively controls the production cost, is easy to install, and is particularly suitable for application in limited space or renovation projects. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A sectional view of a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0017] Figure 2 A perspective view of a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0018] Figure 3 A front view of a core unit in a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0019] Figure 4 A top view of a core unit in a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0020] Figure 5 A structural diagram of a restraint pad in a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0021] Figure 6 A structural diagram of a front and rear restraint steel plate in a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0022] Figure 7 A structural diagram of a left outer restraint steel plate in a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0023] Figure 8 An installation diagram of a self-centering buckling-restrained brace structure based on a two-stage disc spring.

[0024] Reference sign annotation: 1 - core unit, 2 - lower outer restraint pad, 3 - upper outer restraint pad, 4 - left outer restraint steel plate, 5 - right outer restraint steel plate, 6 - stiffened rib steel plate, 7 - circular hole, 8 - bolt hole, 9 - screw hole, 10 - spring, 11 - movable plate, 12 - connecting plate, 13 - end steel plate, 14 - front and rear restraint steel plate, 15 - connecting portion, 16 - support steel plate, 17 - sawtooth groove, 18 - support structure body. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and examples; in the drawings or description, similar or identical parts use the same reference numerals, and in practical application, the shape, thickness or height of each component can be enlarged or reduced. The various examples listed in the present application are only used to illustrate the present application, and are not used to limit the scope of the present application. Any obvious modification or change made to the present application does not deviate from the spirit and scope of the present application.

[0026] In one embodiment, as Figures 1-8As shown, a kind of self-resetting buckling-restrained brace structure based on double-stage disc spring includes core unit 1, the both sides of the core unit 1 are provided with restraint pad, the position of the core unit 1 and restraint pad contact is provided with sawtooth connection 15, the outside of the core unit 1 is provided with outer restraint unit, the outer restraint unit includes left and right restraint unit and front and rear restraint unit, the front and rear restraint unit is front and rear restraint steel plate 14, the left and right restraint unit and front and rear restraint unit are all provided with deep groove, and outer restraint unit is combined together by friction and mechanical interlocking force and restrains core unit 1;

[0027] The left and right restraint unit includes left outer restraint steel plate 4 and right outer restraint steel plate 5, the left outer restraint steel plate 4 and right outer restraint steel plate 5 are respectively arranged on the both sides of the outside of the core unit 1, the side of the left outer restraint steel plate 4 and right outer restraint steel plate 5 away from each other is provided with stiffened rib steel plate 6, one end of the stiffened rib steel plate 6 is provided with end steel plate 13, the outside of the end steel plate 13 is provided with support steel plate 16, the side wall of the support steel plate 16 is provided with a plurality of connecting bolts, one end of the connecting bolt is provided with movable plate 11, the side wall of the movable plate 11 is provided with connecting plate 12, the spring 10 is arranged between the support steel plate 16 and movable plate 11.

[0028] Self-resetting buckling-restrained brace structure based on double-stage disc spring adopts unique double-stage disc spring structure, ensures that support can automatically restore to initial position after experiencing large deformation, has excellent self-resetting ability, reduces the risk of permanent deformation, and the design of test piece integrates advanced concepts of fractal geometry, material science and structural mechanics, realizes efficient energy absorption and release mechanism by optimizing the shape and layout of support, as an embodiment, the left and right upper and lower positions of each component given in the drawing are only one arrangement, and the specific position is set according to specific needs.

[0029] In one embodiment, as shown in Figures 1-5 The restraint pad includes upper outer restraint pad 3 and lower outer restraint pad 2, and the outside of the upper outer restraint pad 3 and the lower outer restraint pad 2 is provided with sawtooth groove 17.

[0030] In one embodiment, as shown in Figures 1-3 The core unit 1 is provided with a plurality of circular holes 7, the distance between the circular holes 7 and the end of the core unit 1 is 35mm, the interval between each circular hole 7 is 10mm, and the diameter of the circular hole 7 is 10mm, 15mm, 20mm and 25mm in turn.

[0031] In one embodiment, as shown in Figure 1 The stiffened rib steel plate 6 is provided with a plurality of screw holes 9.

[0032] In one embodiment, as shown in Figure 1 The upper outer constraint pad 3 and the lower outer constraint pad 2 are both provided with a plurality of bolt holes 8.

[0033] The scheme design of the buckling-restrained brace structure includes the following steps:

[0034] 1) Double-stage disc spring design: the brace stiffness and self-resetting speed are controlled by adjusting the disc spring material and geometric parameters (such as thickness, diameter ratio, etc.);

[0035] 2) Design of fractal self-resetting buckling-restrained brace: the fractal points are extracted by means of an analysis function, and then the points extracted in the analysis function are drawn into the curve sketch of the core unit in the design scheme by using drawing software, and then a combination disc spring is added at both ends as the final one-dimensional graph;

[0036] 3) Two-dimensional sketch generation: the one-dimensional graph in step 2 above is imported into three-dimensional software to draw the fractal self-resetting buckling-restrained brace sketch of the double-stage disc spring;

[0037] 4) Three-dimensional modeling: according to the sketch in step 3 above, the appearance of the fractal self-resetting buckling-restrained brace, the outer constraint unit and the connecting unit of the double-stage disc spring are generated according to the design scheme;

[0038] 5) Specimen preparation: according to the appearance in step 4, the energy dissipation component, i.e. the actual specimen of the fractal buckling-restrained brace, is prepared in the machining workshop.

[0039] A construction process of a self-resetting buckling-restrained brace structure based on a double-stage disc spring includes the following steps:

[0040] 1) Design scheme: a fractal brace with core unit length, width and height dimensions of 300 mm, 50 mm and 10 mm (excluding transition section and connecting section) is prepared;

[0041] 2) A sawtooth-shaped outer constraint unit (one upper and one lower pad with holes) with a thickness of 12 mm is prepared, which is in contact with the edges of the core unit;

[0042] 3) An outer constraint unit (one front and one rear rectangular steel plate with holes) with length, width and height dimensions of 300 mm, 100 mm and 20 mm is prepared, which is in contact with the remaining surface of the core unit 1, and the left and right constraints and the front and rear constraints are both provided with deep grooves of the same size, which are combined together by using the friction and mechanical engagement force to constrain the core unit;

[0043] 4) The constraint pads on the upper and lower sides of the core unit 1 are connected to the front and rear constraints by using bolts to constrain the core unit 1 to prevent buckling;

[0044] 5) The connection unit is spliced and stiffened to reduce the damage of welding to the component and reduce the residual stress during welding;

[0045] 6) The connecting segments on both sides of the core unit 1 are bolted to the movable plate 11, and the same size connecting plate 12 is made. The movable plate 11 is bolted to the supporting steel plate 16, and the disc spring product is placed in the middle link of the movable plate 11 and the supporting steel plate 16, so as to realize the fractal self-resetting buckling-restrained brace of the single-stage disc spring.

[0046] The self-resetting buckling-restrained brace structure based on the double-stage disc spring provided in the above embodiments of the utility model has the following advantages: the design principle of the test piece: the fractal self-resetting bucking-restrained brace test piece design of the double-stage disc spring integrates the advanced concepts of fractal geometry, material science and structural mechanics. By optimizing the shape and layout of the support through fractal geometry, an efficient energy absorption and release mechanism is realized. The design utilizes elastic materials and a unique double-stage disc spring structure to ensure that the support can automatically return to the initial position after experiencing large deformation, has excellent self-resetting capability, and reduces the risk of permanent deformation. At the same time, by enhancing the local stability and overall stiffness, the occurrence of buckling phenomenon is effectively prevented, and through the efficient energy dissipation mechanism, the influence of external impact on the main structure is reduced. The application of this support system in earthquake-prone areas can significantly improve the seismic performance and safety of buildings, reduce the cost and time of post-disaster reconstruction, and provide important technical support for the development of modern structural engineering.

[0047] Energy dissipation working principle: the fractal self-resetting buckling-restrained brace of the double-stage disc spring optimizes the shape and layout through fractal geometry, uniformly distributes stress and improves energy absorption capacity; the double-stage disc spring design includes linear elastic deformation and nonlinear plastic deformation two stages, which can dissipate a large amount of energy through plastic deformation under high load, and has self-resetting function, reduces the risk of permanent deformation; by enhancing the local stability and overall stiffness, the buckling phenomenon is prevented, and the energy dissipation capacity is further improved by using new damping materials, ensuring efficient absorption and dissipation of energy under external load (such as earthquake), significantly improving the seismic performance and safety of building structure.

[0048] The mounting mode of the support structure body 18 is as shown in Figure 8 The overall structure is a five-layer concrete frame structure, and the double-stage disc spring self-resetting buckling-restrained brace is installed on the east side of the frame, that is, the self-resetting buckling-restrained brace is arranged in K-shaped at the frame beam column joint by means of large stiffness back rod and ordinary support, forming an external reinforcement system.

[0049] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A self-resetting buckling-resistance support structure based on a double-stage disc spring, comprising a core unit, characterized in that, The core unit is provided with constraint pads on both the upper and lower sides. The core unit is provided with a serrated connecting part at the contact position with the constraint pads. The core unit is provided with an outer constraint unit around its perimeter. The outer constraint unit includes left and right constraint units and front and rear constraint units. The front and rear constraint units are front and rear constraint steel plates. The left and right constraint units and the front and rear constraint units are all provided with deep grooves. The constraint units are combined together by friction and mechanical interlocking force to constrain the core unit. The left and right constraint units include a left outer constraint steel plate and a right outer constraint steel plate, which are respectively arranged on the outer sides of the core unit. A stiffening rib steel plate is provided on the side of the left and right outer constraint steel plates that are far apart from each other. An end steel plate is provided at one end of the stiffening rib steel plate. A support steel plate is provided on the outside of the end steel plate. Multiple connecting bolts are provided on the side wall of the support steel plate. A movable plate is provided at one end of the connecting bolt. A connecting plate is provided on the side wall of the movable plate. A spring is provided between the support steel plate and the movable plate.

2. The self-resetting buckling-resistant support structure based on a double-stage disc spring according to claim 1, characterized in that, The constraint pad includes an upper outer constraint pad and a lower outer constraint pad, and both the upper and lower outer constraint pads are provided with serrated grooves on their exteriors.

3. The self-resetting buckling-resistant support structure based on a double-stage disc spring according to claim 1, characterized in that, The core unit has multiple circular holes, which are 35 mm from the end of the core unit. The spacing between each circular hole is 10 mm, and the diameters of the circular holes are 10 mm, 15 mm, 20 mm and 25 mm respectively.

4. The self-resetting buckling-resistant support structure based on a double-stage disc spring according to claim 1, characterized in that, The stiffening rib steel plate has multiple screw holes.

5. The self-resetting buckling-resistant support structure based on a double-stage disc spring according to claim 2, characterized in that, Both the upper and lower external constraint pads have multiple bolt holes on their exteriors.

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