An adjustable self-resetting variable cross-section friction energy dissipation device

Abstract

The application provides a kind of adjustable self-resetting variable cross-section friction energy dissipation device, belonging to structural engineering technical field, the adjustable self-resetting variable cross-section friction energy dissipation device includes sleeve assembly and two front and rear mutually symmetrical variable cross-section steel bars inserted in sleeve assembly;Two variable cross-section steel bars are sequentially provided with first taper surface, first equal diameter section and second taper surface and traction rod from opposite end to far away end;The diameter of two first taper surfaces gradually decreases from opposite end to far away end;Load is transmitted to variable cross-section steel bar through steel structure, and variable cross-section steel bar is subjected to reciprocating tension and compression force to generate reciprocating movement along axial direction, and due to the fit of variable cross-section steel bar and inner side of sector cover plate, axial direction force is converted into vertical direction force, under the action of SMA wire, sector cover plate is re-tightened, and is fitted with variable cross-section steel bar, so that variable cross-section steel bar is not easy to deform and can continue to work.

Description

Technical Field

[0001] This invention belongs to the field of structural engineering technology, specifically relating to an adjustable self-resetting variable cross-section friction energy dissipation device. Background Technology

[0002] my country is an earthquake-prone region, making seismic design of structures essential. In the field of seismic engineering, damping technology effectively mitigates earthquake damage and has been widely applied in engineering projects. Dampers are among the most important damping devices, with metal friction dampers being one of the most mature and widely used products.

[0003] Metal friction dampers dissipate energy by utilizing the elasto-plastic hysteretic deformation that occurs when a metal element yields. Metal materials often possess excellent hysteretic characteristics and low-cycle fatigue performance, and are less affected by external environmental and temperature changes. Under the excitation of external loads such as earthquakes and wind, vibrations cause relative displacement between two points in the structure or between structures themselves. The damper then undergoes reciprocating motion, and the metal material within the damper repeatedly experiences compression or tension, resulting in hysteretic deformation and energy dissipation. It is a simple and efficient passive energy dissipation device widely used in civil engineering.

[0004] Currently, friction dampers have the following main drawbacks:

[0005] (1) Metal materials will produce residual deformation after a strong earthquake, which weakens their energy dissipation capacity and affects the subsequent shock absorption effect. Relying solely on the hysteretic deformation of metal to dissipate energy will result in excessive residual deformation after several earthquakes, or even breakage, making it unsuitable for continued operation and requiring timely replacement after the earthquake.

[0006] (2) Small-sized dampers have limited energy dissipation capacity and applicable scenarios. If the energy dissipation capacity of the damper is to be further improved, the size of the damper needs to be increased. Summary of the Invention

[0007] The purpose of this invention is to provide an adjustable self-resetting variable cross-section friction energy dissipation device, which aims to solve the problems in the prior art where the damper itself is prone to breakage and the damper's energy dissipation capacity and applicable scenarios are limited.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an adjustable self-resetting variable cross-section friction energy dissipation device, comprising: a sleeve assembly and two variable cross-section steel bars symmetrically inserted into the sleeve assembly; the two variable cross-section steel bars are sequentially provided with a first conical surface, a first equal-diameter section, a second conical surface, and a traction rod from one end to the other; the diameters of the two first conical surfaces gradually decrease from one end to the other, and the minimum diameter of the first conical surface is equal to the diameter of the first equal-diameter section; the diameters of the two second conical surfaces gradually increase from one end to the other, and the minimum diameter of the second conical surface is equal to the diameter of the first equal-diameter section; the opposite ends of the two traction rods are inserted into the sleeve assembly, and the opposite ends of the two traction rods are fixed to the second conical surfaces. The connection involves two traction rods, one end of which extends through a sleeve assembly. The sleeve assembly is a cylindrical structure that is open at both ends. Inside the sleeve assembly are two variable cross-section holes arranged in a mirror-symmetrical manner. The variable cross-section holes include a first conical hole, a first equal-diameter hole, and a second conical hole connected in sequence. The diameter of the first conical hole gradually decreases in the direction away from the first equal-diameter hole, and the first conical hole fits into the first conical surface. The diameter of the second conical hole gradually increases in the direction away from the first equal-diameter hole, and the second conical hole fits into the second conical surface. The inner diameter of the first equal-diameter hole is the same as the diameter of the first equal-diameter section, and the first equal-diameter hole fits into the first equal-diameter section. The sleeve assembly includes at least two fan-shaped cover plates divided circumferentially therefrom. SMA threads are wound circumferentially on the outer circumferential surface of the sleeve assembly.

[0009] As a preferred embodiment of the present invention, a second equal-diameter section is provided on the side of the second conical surface away from the first equal-diameter section, and the other side of the second equal-diameter section is fixedly connected to the traction rod;

[0010] The diameter of the second equal-diameter section is larger than the diameter of the traction rod, and the diameter of the traction rod is the same as the inner diameter of the opening at the front end of the sleeve assembly;

[0011] The second tapered hole is fixedly provided at the end away from the first equal diameter hole. The inner diameter of the second equal diameter hole is the same as the diameter of the second equal diameter section, and the second equal diameter hole and the second equal diameter section fit together.

[0012] A fourth equal-diameter hole is fixedly provided at the end of the second equal-diameter hole away from the second conical hole. The inner diameter of the fourth equal-diameter hole is the same as the diameter of the traction rod, and the fourth equal-diameter hole fits into the traction rod.

[0013] As a preferred embodiment of the present invention, a third equal diameter section is provided at the end of the first tapered surface away from the first equal diameter section, and a third equal diameter hole is provided at the end of the first tapered hole away from the first equal diameter hole;

[0014] The third equal diameter hole and the third equal diameter section fit together.

[0015] As a preferred embodiment of the present invention, an annular groove is provided on the peripheral side of the sleeve assembly, and the SMA wire is wound in the annular groove.

[0016] As a preferred embodiment of the present invention, the sleeve assembly has a plurality of annular grooves spaced apart on its peripheral side.

[0017] As a preferred embodiment of the present invention, each variable cross-section hole corresponds to at least one of the annular grooves inside and outside.

[0018] As a preferred embodiment of the present invention, the first conical surface and the second conical surface form an angle of less than 10 degrees with the axis of the variable cross-section steel bar.

[0019] As a preferred embodiment of the present invention, the variable cross-section steel bar coincides with the axis of the sleeve assembly.

[0020] As a preferred embodiment of the present invention, the SMA yarn is formed by winding multiple SMA yarns together.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In this adjustable self-resetting variable cross-section friction energy dissipation device, the load is transmitted to the variable cross-section steel bar through the steel structure. The variable cross-section steel bar is subjected to reciprocating tension and compression, resulting in reciprocating motion at both ends in the axial direction. Since the variable cross-section steel bar is in contact with the inner side of the sleeve assembly, the axial force can be converted into a vertical force through the interaction of the first conical surface, the first equal diameter section and the second conical surface with the first conical hole, the second conical hole and the first equal diameter hole.

[0023] Under the action of the SMA wire, the bushing assembly is tightened again and brought into contact with the variable cross-section steel bar, so that the variable cross-section steel bar is not easily deformed and can continue to work.

[0024] 2. This adjustable self-resetting variable cross-section friction energy dissipation device adjusts the tightness of the damper by adjusting the diameter, number of turns and strands of the SMA wire, thereby improving the load-bearing capacity and energy dissipation capacity. It does not require increasing the size of the damper to improve the energy dissipation capacity, thus increasing the practicality of the device.

[0025] 3. This adjustable self-resetting variable cross-section friction energy dissipation device can pre-stress the SMA wire to induce plastic deformation, providing greater resistance when the sleeve assembly is stretched vertically, thus further improving the overall energy dissipation capacity of the damper. The pre-stress can be adjusted according to the application scenario of the damper, thereby adjusting the overall energy dissipation capacity of the damper; alternatively, no pre-stress can be applied, and the SMA wire can still improve the overall energy dissipation capacity of the damper. This can be freely selected by the operator, making the application scenarios of the device more extensive. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the exploded structure of the first specific embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the variable cross-section steel bar in the first specific embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional structural diagram of the first specific embodiment of the present invention;

[0030] Figure 4 This is a cross-sectional structural diagram of the first specific embodiment of the present invention.

[0031] In the diagram: 11. Variable cross-section steel bar; 12. SMA wire; 13. Traction rod; 14. Second equal diameter section; 15. Second conical surface; 16. First equal diameter section; 17. First conical surface; 18. Third equal diameter section; 20. Sleeve assembly; 21. Fan-shaped cover plate; 22. Second equal diameter hole; 23. Second conical hole; 24. First equal diameter hole; 25. First conical hole; 26. Third equal diameter hole; 27. Annular groove; 28. Fourth equal diameter hole. Detailed Implementation

[0032] my country is an earthquake-prone region, making seismic design of structures essential. In the field of seismic engineering, damping technology effectively mitigates earthquake damage and has been widely applied in engineering projects. Dampers are among the most important damping devices, with metal friction dampers being one of the most mature and widely used products.

[0033] Example 1: Please refer to Figure 1-4 The present invention provides the following technical solution: a sliding friction damper for wound prestressed SMA wire, comprising: a sleeve assembly 20 and two variable cross-section steel bars 11 symmetrically inserted into the sleeve assembly 20, wherein the variable cross-section steel bars 11 are hinged to the steel structure via a shaft.

[0034] Please see Figure 1-3 Two variable cross-section steel bars 11 are provided with a first conical surface 17, a first equal diameter section 16, a second conical surface 15, and a traction rod 13 in sequence from one end opposite to the other.

[0035] The first tapered surface 17, the first equal diameter section 16, and the second tapered surface 15 are used to cooperate with the variable cross section of the casing assembly 20 to transmit axial force and deformation to the vertical force and deformation of the casing assembly 20 and the SMA wire 12.

[0036] The diameter of the second conical surface 15 gradually increases from one end to the other end, and the minimum diameter of the second conical surface 15 is equal to the diameter of the first equal diameter section 16, which can better convert the axial force into the vertical force.

[0037] The diameters of the two first conical surfaces 17 gradually decrease from one end to the other, and the minimum diameter of the first conical surface 17 is equal to the diameter of the first equal diameter section 16, which can better convert the axial force into the vertical force.

[0038] One end of each of the two traction rods 13 is inserted into the sleeve assembly 20, and the opposite ends of the two traction rods 13 are fixedly connected to the second conical surface 15. The opposite ends of the two traction rods 13 protrude out of the sleeve assembly 20. The part of the traction rod 13 that protrudes out of the sleeve assembly 20 is hinged to the steel structure through a shaft.

[0039] When subjected to an earthquake, the load can be transferred to the first conical surface 17, the first equal diameter section 16, and the second conical surface 15 through the traction rod 13.

[0040] The sleeve assembly 20 is a cylindrical structure that is open at both ends, and the sleeve assembly 20 has two variable cross-section holes that are mirror-symmetrically arranged at both ends.

[0041] The variable cross-section hole fits into the first conical surface 17, the first equal diameter section 16, and the second conical surface 15. The purpose of the variable cross-section hole is to enable the sleeve assembly 20 to fit well with the variable cross-section steel bar 11, so that the variable cross-section steel bar 11 and the sleeve assembly 20 can slide together.

[0042] The variable cross-section hole includes a first tapered hole 25, a first equal diameter hole 24, and a second tapered hole 23. The diameter of the first tapered hole 25 gradually decreases in the direction away from the first equal diameter hole 24, and the first tapered hole 25 fits into the first tapered surface 17. Through the cooperation between the first tapered hole 25 and the first tapered surface 17, the axial force can be better converted into the vertical force.

[0043] The diameter of the second conical hole 23 gradually increases in the direction away from the first equal diameter hole 24, and the second conical hole 23 and the second conical surface 15 fit together. Through the cooperation between the second conical hole 23 and the second conical surface 15, the axial force can be better converted into the vertical force.

[0044] The inner diameter of the first equal diameter hole 24 is the same as the diameter of the first equal diameter section 16, and the first equal diameter hole 24 and the first equal diameter section 16 fit together. The first equal diameter section 16 and the first equal diameter hole 24 can make the diameter change of the variable cross section steel bar 11 smoother, prevent stress concentration at a smaller cross section, and prevent the variable cross section steel bar 11 from brittlely failing, thereby causing the damper to fail.

[0045] At the same time, to prevent the variable cross-section steel bar 11 from being pulled out, forming a shape like... Figure 4 The "lock" shown at point A in the middle.

[0046] Please see Figure 1-4 A second equal-diameter section 14 is provided on the side of the second conical surface 15 away from the first equal-diameter section 16, and the other side of the second equal-diameter section 14 is fixedly connected to the traction rod 13; the diameter of the second equal-diameter section 14 is larger than the diameter of the traction rod 13, so that it can cooperate with the sleeve assembly 20 to form a "lock". Figure 4 As shown at point A, the length of the second equal-diameter section 14 is less than the length of the traction rod 13, so as to transmit and connect axial forces.

[0047] The diameter of the traction rod 13 is the same as the inner diameter of the opening at the front end of the sleeve assembly 20, allowing it to move inside the sleeve assembly 20; the end of the second tapered hole 23 away from the first equal diameter hole 24 is fixedly provided with a second equal diameter hole 22, the inner diameter of the second equal diameter hole 22 is the same as the diameter of the second equal diameter section 14, the second equal diameter hole 22 and the second equal diameter section 14 fit together, so that they can fit together with the variable cross-section steel bar 11 and thus slide relative to each other.

[0048] A fourth equal diameter hole 28 is fixedly provided at one end of the second equal diameter hole 22 away from the second conical hole 23. The inner diameter of the fourth equal diameter hole 28 is the same as the diameter of the traction rod 13. The second equal diameter hole 22 and the traction rod 13 fit together. The traction rod 13 can slide in the fourth equal diameter hole 28.

[0049] The first tapered surface 17 is provided with a third equal diameter section 18 at the end away from the first equal diameter section 16, and the first tapered hole 25 is provided with a third equal diameter hole 26 at the end away from the first equal diameter hole 24; the third equal diameter hole 26 and the third equal diameter section 18 fit together, causing the variable cross-section steel bar 11 to be displaced inside the sleeve assembly 20 and slide.

[0050] The first conical surface 17 and the second conical surface 15 form an angle of less than 45 degrees with the axis of the variable cross-section steel bar 11. Let the displacement of the variable cross-section steel bar 11 be Δ, and the vertical displacement of the sector-shaped cover plate 21 be δ. The relationship between the two can be expressed as: θ is less than 45°. According to the above formula, the horizontal deformation of the damper is greater than the vertical deformation of the sector-shaped cover plate 21. However, due to the winding of two strands of prestressed SMA wire 12, the tensile deformation of the SMA wire 12 caused by the displacement of the sector-shaped cover plate 21 is even smaller. Therefore, a significant advantage of this damper is that a small deformation of the SMA wire 12 can produce considerable damper deformation.

[0051] SMA wires 12 are wound circumferentially on the outer periphery of the sleeve assembly 20. The SMA wires 12 wound on the sleeve assembly 20 are stretched and plastically deformed by the tension of the sleeve assembly 20, providing additional stiffness and energy dissipation capacity for the damper. SMA material has a unique shape memory effect and superelasticity, and has the ability to automatically recover its initial shape and strain after experiencing large strain. The plastically deformed part of the SMA wires 12 self-resets due to its own shape memory effect, restores its original shape, and drives the sleeve assembly 20 to tighten again and fit with the variable cross-section steel bar 11.

[0052] SMA wire can be pre-stressed, which can provide greater resistance when the sleeve assembly 20 is stretched in the vertical direction, allowing for full plastic deformation and improving the overall energy dissipation capacity of the damper. The operator can control the deformation energy dissipation of the damper by adjusting the pre-stress; alternatively, no pre-stress can be applied, and SMA can still improve the overall energy dissipation capacity of the damper, which can be freely selected by the operator.

[0053] The sleeve assembly 20 includes at least two sector-shaped cover plates 21 divided circumferentially therefrom; the peripheral side of the sleeve assembly 20 has multiple (e.g., Figure 1 (As shown) Annular grooves 27 are arranged at intervals; SMA wires 12 are wound inside the annular grooves 27, and each variable cross-section hole corresponds to at least one of the annular grooves 27, so that the radial force can be directly constrained by the SMA wires 12 inside the annular grooves 27; the SMA wires 12 are made of multiple SMA wires wound together, and the tightness of the damper can be adjusted by the diameter and number of turns of the SMA wires, thereby improving the load-bearing capacity and energy dissipation capacity.

[0054] Please see Figure 1-4 Working principle: When subjected to earthquake action, the load is transmitted to the variable cross-section steel bar 11 through the steel structure. The variable cross-section steel bar 11 is subjected to reciprocating tensile and compressive forces, resulting in reciprocating motion at both ends along the axial direction.

[0055] Because the diameter of the second equal-diameter section 14 is larger than the diameter of the traction rod 13, and the diameter of the traction rod 13 is the same as the diameter of the opening at the front end of the sector-shaped cover plate 21, a "locking" is formed between the variable cross-section steel rod 11 and the sleeve assembly 20. Figure 4 As shown at point A, the second equal diameter hole 22 has the same diameter as the second equal diameter section 14, which causes the variable cross-section steel bar 11 to undergo relative displacement inside the sector cover plate 21.

[0056] The second conical hole 23 and the first conical surface 17 have the same size variation pattern. The second conical hole 23 and the first conical surface 17 fit together. The first conical hole 25 and the second conical surface 15 have the same size variation pattern. The first conical hole 25 and the second conical surface 15 fit together, so that the sleeve assembly 20 and the variable cross-section steel bar 11 can fit together well, and the axial force can be effectively converted into the vertical force.

[0057] The sleeve assembly 20 is pushed open by the variable cross-section steel bar 11. With the reciprocating motion of the variable cross-section steel bar 11, it moves vertically at the variable cross-section. Under the action of the SMA wire 12, the fan-shaped cover plate 21 is tightened again and fits with the variable cross-section steel bar 11, thereby reducing the residual deformation of the damper after the earthquake and making the seismic performance more superior.

[0058] Example 2: An adjustable self-resetting variable cross-section friction energy dissipation device. The difference between this example and Example 1 is that the sleeve assembly 20 includes three sector-shaped cover plates 21 divided along its circumference. The other structures are the same as in Example 1.

[0059] Example 3: An adjustable self-resetting variable cross-section friction energy dissipation device. The difference between this example and Example 1 is that three annular grooves 27 are provided on the peripheral side of the sleeve assembly 20 at intervals. The other structures are the same as in Example 1.

[0060] Example 4: An adjustable self-resetting variable cross-section friction energy dissipation device. The difference between this example and Example 1 is that the annular groove 27 is nested with SWA tubing, and the deformation of the SWA tubing consumes energy to achieve the same effect as SWA wire.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An adjustable self-resetting variable cross-section friction energy dissipation device, characterized in that: It includes a sleeve assembly (20) and two variable cross-section steel bars (11) inserted symmetrically in front and behind the sleeve assembly (20). Two variable cross-section steel bars (11) are provided with a first conical surface (17), a first equal diameter section (16), a second conical surface (15), and a traction rod (13) from one end to the other. The diameters of the two first conical surfaces (17) gradually decrease from one end to the other end, and the minimum diameter of the first conical surface (17) is equal to the diameter of the first equal diameter segment (16); The diameters of the two second conical surfaces (15) gradually increase from one end to the other end, and the minimum diameter of the second conical surface (15) is equal to the diameter of the first equal diameter segment (16); One end of each of the two traction rods (13) is inserted into the sleeve assembly (20), and the other end of each of the two traction rods (13) is fixedly connected to the second conical surface (15). The opposite ends of the two traction rods (13) pass through the sleeve assembly (20). The sleeve assembly (20) is a cylindrical structure that is open at both ends. The sleeve assembly (20) has two variable cross-section holes that are mirror-symmetrically arranged at both ends. The two variable cross-section holes include a first conical hole (25), a first equal diameter hole (24), and a second conical hole (23) that are connected sequentially from one end to the other. The diameter of the first conical hole (25) gradually decreases in the direction away from the first equal diameter hole (24), and the first conical hole (25) and the first conical surface (17) fit together. The diameter of the second conical hole (23) gradually increases in the direction away from the first equal diameter hole (24), and the second conical hole (23) and the second conical surface (15) fit together. The inner diameter of the first equal diameter hole (24) is the same as the diameter of the first equal diameter section (16), and the first equal diameter hole (24) and the first equal diameter section (16) fit together. The sleeve assembly (20) includes at least two sector-shaped cover plates (21) that are divided circumferentially thereon; SMA wires (12) are wound circumferentially on the outer peripheral surface of the sleeve assembly (20); The sleeve assembly (20) has an annular groove (27) on its peripheral side, and the SMA wire (12) is wound in the annular groove (27); Each variable cross-section hole corresponds to at least one of the annular grooves (27) inside and outside.

2. The adjustable self-resetting variable cross-section friction energy dissipation device according to claim 1, characterized in that: The second conical surface (15) is provided with a second equal diameter section (14) on the side away from the first equal diameter section (16), and the other side of the second equal diameter section (14) is fixedly connected to the traction rod (13); The diameter of the second equal diameter section (14) is greater than the diameter of the traction rod (13), and the diameter of the traction rod (13) is the same as the inner diameter of the opening at the front end of the sleeve assembly (20); The second tapered hole (23) is fixedly provided with a second equal diameter hole (22) at one end away from the first equal diameter hole (24). The inner diameter of the second equal diameter hole (22) is the same as the diameter of the second equal diameter section (14). The second equal diameter hole (22) and the second equal diameter section (14) fit together. A fourth equal diameter hole (28) is fixedly provided at one end of the second equal diameter hole (22) away from the second conical hole (23). The inner diameter of the fourth equal diameter hole (28) is the same as the diameter of the traction rod (13), and the fourth equal diameter hole (28) and the traction rod (13) fit together.

3. The adjustable self-resetting variable cross-section friction energy dissipation device according to claim 2, characterized in that: The first conical surface (17) is provided with a third equal diameter section (18) at the end away from the first equal diameter section (16), and the first conical hole (25) is provided with a third equal diameter hole (26) at the end away from the first equal diameter hole (24). The third equal diameter hole (26) and the third equal diameter section (18) fit together.

4. The adjustable self-resetting variable cross-section friction energy dissipation device according to claim 3, characterized in that: The sleeve assembly (20) has multiple annular grooves (27) spaced apart on its peripheral side.

5. An adjustable self-resetting variable cross-section friction energy dissipation device according to any one of claims 1-3, characterized in that: The first conical surface (17) and the second conical surface (15) form an angle of less than 45 degrees with the axis of the variable cross-section steel bar (11).

6. The adjustable self-resetting variable cross-section friction energy dissipation device according to claim 1, characterized in that: The axis of the variable cross-section steel bar (11) coincides with that of the sleeve assembly (20).

7. The adjustable self-resetting variable cross-section friction energy dissipation device according to claim 1, characterized in that: The SMA thread (12) is made of multiple SMA threads wound together.

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