Variable-friction self-resetting SMA damper

Abstract

The utility model discloses a variable-friction self-resetting SMA damper, and belongs to the field of concrete building structures. According to the variable-friction self-resetting SMA damper, the vertical baffle, the first friction plate, the push-pull rod, the second friction plate, the friction plate, the SMA rod, the limiting device and the multiple friction sliding devices are arranged, so that the whole device can drive the friction sliding devices to move through the push-pull rod, and then the SMA rod is stretched; the friction force can be increased along with the increase of the external load, the SMA bars are always in a tension state no matter whether the structure is pulled or pressed, the tension resistance of the SMA bars can be fully exerted, and therefore the overall anti-seismic performance of the structure is improved.

Description

Technical Field

[0001] The utility model belongs to the field of concrete building structures and relates to a variable friction self-resetting SMA damper. Background Art

[0002] Since the construction process of prefabricated buildings has the advantages of green, low-carbon, energy-saving and environmental protection, short construction period, and reliable engineering quality, the development of prefabricated buildings has become a general trend, and the demand for seismic resistance and shock absorption of prefabricated building systems is getting higher and higher. Therefore, various energy-consuming damping devices have been developed. Common friction dampers are mainly divided into: ordinary friction dampers, variable friction dampers, and self-resetting friction dampers. Friction dampers have stable hysteresis performance, strong energy dissipation capacity, easy use, low maintenance cost, and no need for external energy support. However, the SMA friction dampers currently developed are of various types, most of which are made of SMA wire (SMA bundles or SMA stranded wires), with complex structures, and limited friction energy dissipation and self-resetting capabilities. Therefore, they are rarely used in actual projects. Utility Model Content

[0003] The utility model aims to provide a variable friction self-resetting SMA damper, which is used to solve the technical problems of limited friction energy consumption and self-resetting ability in the current SMA friction damper.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a variable friction self-resetting SMA damper, comprising a vertical baffle, a first friction plate, a push-pull rod, a second friction plate, a friction sheet, a plurality of SMA rods), a limiting device and a plurality of friction sliding devices; the first friction plate and the second friction plate are arranged parallel to each other; the vertical baffle is fixedly connected to one end of the first friction plate and the second friction plate; the plurality of friction sliding devices are arranged between the first friction plate and the second friction plate at intervals, and fit with the inner surfaces of the first friction plate and the second friction plate; the friction sheet is arranged between the plurality of friction sliding devices and the inner surfaces of the first friction plate and the second friction plate; one end of the push-pull rod passes through the plurality of friction sliding devices, and the other end is connected to a building; the plurality of SMA rods pass through the plurality of friction sliding devices and are fixedly connected to the friction sliding devices; the limiting device is inserted from the outer surface of the first friction plate to limit the two friction sliding devices arranged at intervals.

[0006] Further, the friction sliding device comprises a first friction wedge slider, a second friction wedge slider and a third friction wedge slider; the second friction wedge slider is arranged between the first friction wedge slider and the third friction wedge slider; the first friction wedge slider and the third friction wedge slider are respectively fitted with the inner surfaces of the first friction plate and the second friction plate;

[0007] The friction plates are respectively arranged between the first friction wedge slider and the first friction plate, and the third friction wedge slider is respectively arranged between the second friction plate.

[0008] Furthermore, one end of the push-pull rod passes through the center of a second friction wedge-shaped sliding block in the plurality of friction sliding devices and can slide in the second friction wedge-shaped sliding block.

[0009] Furthermore, the plurality of SMA rods respectively pass through the first friction wedge slider and the third friction wedge slider in the plurality of friction sliding devices, and are fixedly connected to the first friction wedge slider and the third friction wedge slider.

[0010] Furthermore, when the several SMA rods pass through the first friction wedge slider and the third friction wedge slider, they are fixedly connected by anchors; the SMA rods are fixed to the first friction wedge slider and the third friction wedge slider near the vertical baffle and the other end of the push-pull rod by bolts.

[0011] Furthermore, the limiting device is a plurality of limiting bolts; the plurality of limiting bolts pass through the first friction plate and the second friction plate and are fixed to the first friction plate and the second friction plate through limiting nuts.

[0012] Furthermore, the plurality of limiting bolts pass through the first friction plate and the second friction plate to limit the relative sliding of the first friction wedge-shaped sliding blocks in the two friction sliding devices disposed at intervals.

[0013] Furthermore, the plurality of limiting bolts pass through the first friction plate and the second friction plate to limit the relative sliding of the first friction wedge-shaped sliding blocks in the two friction sliding devices disposed at intervals.

[0014] Furthermore, a metal cylinder is welded on the push-pull rod between the two friction sliding devices arranged at intervals; a connecting plate is welded on one end of the vertical baffle, and the connecting plate is connected to the building.

[0015] Furthermore, the friction sheet is bonded to the inner surfaces of the first friction plate and the second friction plate by glue.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model discloses a variable friction self-resetting SMA damper. By arranging a vertical baffle, a first friction plate, a push-pull rod, a second friction plate, a friction sheet, an SMA rod, a limiting device and a plurality of friction sliding devices, the entire device can drive the friction sliding device to move through the push-pull rod, thereby realizing the stretching of the SMA rod, and can increase the friction force as the external load increases. Regardless of whether the structure is under tension or compression, the SMA rod is always in a tension state, and the tensile strength of the SMA rod can be fully utilized, thereby improving the overall anti-seismic performance of the structure. Moreover, when the damper is subjected to an external load, compared with a friction damper made of SMA wire (SMA bundle or SMA stranded wire), the restoring force of the SMA rod will cause the friction between the friction sliding devices to gradually increase, and while realizing variable friction energy consumption, it has better self-resetting ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural front view of the variable friction self-resetting SMA damper of the utility model;

[0019] Figure 2 This is a left view of the structure of the variable friction self-resetting SMA damper of the utility model;

[0020] Figure 3 This is a right side view of the structure of the variable friction self-resetting SMA damper of the utility model;

[0021] Figure 4 It is a structural top view of the variable friction self-resetting SMA damper of the utility model;

[0022] Figure 5 This is a cross-sectional view of the structure 1-1 of the variable friction self-resetting SMA damper of the utility model.

[0023] Among them: 1-vertical baffle; 2-first friction plate; 3-limiting bolt; 4-limiting nut; 5-push-pull rod; 6-second friction plate; 7-first friction wedge slider; 8-second friction wedge slider; 9-third friction wedge slider; 10-friction plate; 11-SMA rod; 12-connecting plate. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] The utility model discloses a variable friction self-resetting SMA damper, comprising a first friction plate 2 and a second friction plate 6, a plurality of friction sliding devices are arranged between the first friction plate 2 and the second friction plate 6, a vertical baffle plate 1 is fixedly connected to one end of the first friction plate 2 and the second friction plate 6 by welding; a plurality of friction sliding devices are arranged between the first friction plate 2 and the second friction plate 6 at intervals, and a friction plate 10 is arranged at the joint between the inner surfaces of the plurality of friction sliding devices and the first friction plate 2 and the second friction plate 6; a push-pull rod 5 and a plurality of SMA rods pass through the plurality of friction sliding devices, one end of the push-pull rod 5 passes through the plurality of friction sliding devices, and the other end is connected to a building; a connecting plate 12 is welded to one end of the vertical baffle plate 1, and the connecting plate 12 is connected to the building; a limiting device is inserted from the outer surface of the first friction plate 2 to limit the two friction sliding devices arranged at intervals; the push-pull rod 5 is a steel structure, a metal cylinder is welded on the push-pull rod 5 located between the two friction sliding devices arranged at intervals, and the movement of the pull rod 5 pushes the plurality of friction sliding devices to move left and right;

[0027] Among them, SMA is the abbreviation of shape memory alloy.

[0028] Preferably, if Figure 1-Figure 5As shown, the variable friction self-resetting SMA damper disclosed in the utility model has two friction sliding devices, and the two friction sliding devices are arranged at intervals between the first friction plate 2 and the second friction plate 6; the disclosed variable friction self-resetting SMA damper includes a vertical baffle 1, a first friction plate 2, a second friction plate 6, a push-pull rod 5, a first friction wedge slider 7, a second friction wedge slider 8, a third friction wedge slider 9, a friction plate 10, a plurality of SMA rods 11, a limiting bolt 3 and a limiting nut 4; wherein the first friction wedge slider 7, the second friction wedge slider 8, and the third friction wedge slider 9 form a friction sliding device; the friction plate 10 is arranged on the surface of the first friction wedge slider 7 and the third friction wedge slider 9, and is fitted with the inner surface of the first friction plate 2 and the second friction plate 6; a circular hole is opened in the middle of the second friction wedge slider 8, the diameter of the circular hole is the same as the diameter of the push-pull rod 5, and the center lines of the two holes coincide, and one end of the push-pull rod 5 passes through the second friction wedge sliders of the two friction sliding devices The slider 8 has a round hole and can slide inside the wedge block; the other end of the push-pull rod 5 is connected to the building; and a metal cylinder is welded on the push-pull rod 5 between the two second friction wedge sliders 8; four limiting bolt holes are reserved on the first friction plate 2, and the limiting bolts 3 are passed through the limiting bolt holes to limit the first friction wedge slider 7; at the same time, four bolt holes are respectively set on both sides of the first friction wedge slider 7 and the third friction wedge slider 9 in the two friction sliding devices, and the diameter of the bolt holes is the same as the diameter of the SMA rod 11. The four SMA rods 11 pass through the four bolt holes and are fixedly connected with the first friction wedge slider 7 and the third friction wedge slider 9 in the two friction sliding devices; and when the four SMA rods 11 pass through the first friction wedge slider 7 and the third friction wedge slider 9, they are fixedly connected by anchors; the four SMA rods 11 are fixed to the first friction wedge slider 7 and the third friction wedge slider 9 near the vertical baffle 1 and the other end of the push-pull rod 5 by anchors.

[0029] Preferably, the first friction wedge slider 7 , the second friction wedge slider 8 and the third friction wedge slider 9 are made of steel.

[0030] Preferably, the friction plate 10 is made of non-asbestos organic material (NAO) and is adhered to the surface of the wedge-shaped friction slider using industrial glue.

[0031] Preferably, the first friction plate 2 and the second friction plate 6 are square steel structures; and the limiting bolts 3 used are steel structures.

[0032] Preferably, the first friction plate 2 and the second friction plate 6 are respectively provided with limiting bolt holes, and the center lines are located on the same vertical line, and limiting bolts 3 are provided.

[0033] Preferably, at least two SMA rods 11 are disposed between the two first friction wedge sliders 7 ; and at least two SMA rods 11 are disposed between the two third friction wedge sliders 9 .

[0034] The energy dissipation principle of the variable friction self-resetting SMA damper disclosed in the utility model includes the following steps:

[0035] In the initial state, no friction is generated between the first friction wedge slider 7, the second friction wedge slider 8, the third friction wedge slider 9, and between the first friction plate 2 and the second friction plate 6;

[0036] When the damper is pulled, the push-pull rod 5 pushes the second friction wedge slider 8 to move rightward and squeezes the first friction wedge slider 7 and the third friction wedge slider 9. At this time, the first friction wedge slider 7 and the third friction wedge slider 9 and the first friction plate 2 and the second friction plate 6 generate static friction, and the energy consumption is borne by the static friction.

[0037] When the tensile load exceeds the critical value, the second friction wedge slider 8 starts to move to the right, and at the same time pushes the first friction wedge slider 7 and the third friction wedge slider 9 to move to the right. The friction sliding device close to the vertical baffle 1 stops sliding to the right under the restriction of the limit device. The restoring force of the SMA rod 11 increases with the increase of the length. The greater the sliding friction between the first friction wedge slider 7 and the third friction wedge slider 9 and the first friction plate 2 and the second friction plate 6, the effect of variable friction sliding is achieved, and the energy consumption is borne by the sliding friction force and the restoring force of the SMA rod 11.

[0038] After unloading, due to the superelastic force of the SMA rod 11, the first friction wedge slider 7 and the third friction wedge slider 9 in the friction sliding device near the other end of the push-pull rod 5 are driven to move to the left, and then the second friction wedge slider 8 is driven to return to the initial position, showing the self-reset function;

[0039] When the damper is under compression, the energy dissipation principle is the same as when it is under tension.

[0040] Among them, the use of the limiting bolt 3 can not only provide a limiting effect but also increase the rigidity of the first friction plate 2 and the second friction plate 6, thereby increasing the energy consumption efficiency of the damper.

[0041] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A variable friction self-resetting SMA damper, characterized in that: The invention comprises a vertical baffle (1), a first friction plate (2), a push-pull rod (5), a second friction plate (6), a friction plate (10), a plurality of SMA rods (11), a limiting device and a plurality of friction sliding devices; the first friction plate (2) and the second friction plate (6) are arranged parallel to each other; the vertical baffle (1) is fixedly connected to one end of the first friction plate (2) and the second friction plate (6); the plurality of friction sliding devices are arranged between the first friction plate (2) and the second friction plate (6) at intervals and are in contact with the inner surfaces of the first friction plate (2) and the second friction plate (6); the friction plate (10) is arranged between the plurality of friction sliding devices and the inner surfaces of the first friction plate (2) and the second friction plate (6); one end of the push-pull rod (5) passes through the plurality of friction sliding devices and the other end is connected to a building; the plurality of SMA rods (11) pass through the plurality of friction sliding devices and are fixedly connected to the friction sliding devices; the limiting device is inserted from the outer surface of the first friction plate (2) to limit the two friction sliding devices arranged at intervals.

2. A variable friction self-resetting SMA damper according to claim 1, characterized in that: The friction sliding device comprises a first friction wedge slider (7), a second friction wedge slider (8) and a third friction wedge slider (9); the second friction wedge slider (8) is arranged between the first friction wedge slider (7) and the third friction wedge slider (9); the first friction wedge slider (7) and the third friction wedge slider (9) are respectively in contact with the inner surfaces of the first friction plate (2) and the second friction plate (6); The friction plates (10) are respectively arranged between the first friction wedge-shaped slider (7) and the first friction plate (2), and the third friction wedge-shaped slider (9) is respectively arranged between the second friction plate (6).

3. A variable friction self-resetting SMA damper according to claim 2, characterized in that: One end of the push-pull rod (5) passes through the center of a second friction wedge-shaped slider (8) in the plurality of friction sliding devices, and can slide inside the second friction wedge-shaped slider (8).

4. A variable friction self-resetting SMA damper according to claim 2, characterized in that: The plurality of SMA rods (11) respectively pass through a first friction wedge-shaped slider (7) and a third friction wedge-shaped slider (9) in the plurality of friction sliding devices, and are fixedly connected to the first friction wedge-shaped slider (7) and the third friction wedge-shaped slider (9).

5. A variable friction self-resetting SMA damper according to claim 4, characterized in that: When the plurality of SMA rods (11) pass through the first friction wedge-shaped slider (7) and the third friction wedge-shaped slider (9), they are fixedly connected by means of anchors; the SMA rods (11) are fixed to the first friction wedge-shaped slider (7) and the third friction wedge-shaped slider (9) near the vertical baffle (1) and near the other end of the push-pull rod (5) by means of bolts.

6. The variable friction self-resetting SMA damper according to claim 1, characterized in that: The limiting device is a plurality of limiting bolts (3); the plurality of limiting bolts (3) pass through the first friction plate (2) and the second friction plate (6) and are fixed to the first friction plate (2) and the second friction plate (6) through limiting nuts (4).

7. A variable friction self-resetting SMA damper according to claim 6, characterized in that: The plurality of limit bolts (3) pass through the first friction plate (2) and the second friction plate (6) to limit the relative sliding of the first friction wedge-shaped sliding blocks (7) in the two friction sliding devices arranged at intervals.

8. The variable friction self-resetting SMA damper according to claim 6, characterized in that: The plurality of limit bolts (3) pass through the first friction plate (2) and the second friction plate (6) to limit the lateral sliding of the first friction wedge slider (7), the second friction wedge slider (8) and the third friction wedge slider (9).

9. The variable friction self-resetting SMA damper according to claim 1, characterized in that: A metal cylinder is welded to the push-pull rod (5) between the two friction sliding devices arranged at intervals; a connecting plate (12) is welded to one end of the vertical baffle (1), and the connecting plate (12) is connected to the building.

10. The variable friction self-resetting SMA damper according to claim 1, characterized in that: The friction plate (10) is bonded to the inner surfaces of the first friction plate (2) and the second friction plate (6) by glue.

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