A laminated u-shaped shape memory alloy damper

Abstract

The present application relates to a kind of laminated U-shaped shape memory alloy damper, belong to structural vibration control technical field.Laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b are connected together including connecting piece a, connecting piece b;Connecting piece a both ends are provided with counterbore a, connecting piece b both ends are provided with counterbore b, counterbore a and counterbore b are all provided with counterbore bolt;Laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b are all combined by multiple U-shaped shape memory alloy sheet and multiple U-shaped rubber pad layer;Connecting piece a and connecting piece b end recess have square groove, the end of laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b is equipped with opening, the end of laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b is inserted into the square groove, and be connected together by multiple counterbore bolt.The present application effectively solves the problem of energy consumption and deformation.

Description

TECHNICAL FIELD

[0001] The present application relates to a laminated U-shaped shape memory alloy damper and belongs to the technical field of structural vibration control. BACKGROUND

[0002] Bridges are an important part of the transportation network and play an important role in post-earthquake rescue and economic recovery. The southwest of China is a high-seismicity region. Under the action of strong earthquakes, bridges may suffer severe plastic damage. After the earthquake, although structures designed according to the current ductility design concept can avoid collapse, the large residual displacement may cause the bridge to lose its function. After the Wenchuan earthquake, a large number of bridge structures suffered large residual displacement due to strong seismic action. The repair or reconstruction of the bridge often causes huge loss of life and property, which affects post-earthquake life rescue and delays the recovery of normal economic activities in the disaster area.

[0003] In order to reduce the residual displacement of the bridge and restore its function as soon as possible after the earthquake, self-centering technology is considered to be one of the most promising solutions. The principle of self-centering technology is to combine self-centering devices with structures to effectively reduce or even eliminate the residual displacement of the structure and achieve the recoverability of the structure's function after the earthquake. In this category, many self-centering dampers, connections and support devices have been successfully proposed. Among them, U-shaped shape memory alloy plates are widely used in the field of self-centering technology due to their good energy dissipation capacity and resetting ability.

[0004] In order to make U-shaped shape memory alloy plates practical in engineering applications, scholars have conducted a series of material performance studies. The results show that U-shaped shape memory alloy plates have a significant size effect. Specifically, the smaller the thickness of the shape memory alloy plate, the smaller the residual displacement and the stronger the deformation capacity. However, as the thickness of the shape memory alloy plate increases, the residual displacement increases significantly and the resetting performance degrades. At the same time, the material is more prone to brittle failure. These shortcomings limit the practical application of U-shaped shape memory alloy plates in engineering. To solve this problem, some studies have connected multiple U-shaped shape memory alloy plates in series to ensure that their strength meets the requirements of practical engineering. However, this arrangement occupies a large space and the practical application scenarios are limited. In addition, since each U-shaped shape memory alloy plate is installed independently, engineering errors and different installation positions may result in poor coordinated deformation capacity of the device. SUMMARY

[0005] In view of the above-mentioned defects of the prior art, the present application provides a laminated U-shaped shape memory alloy damper, which bonds multiple shape memory alloy sheets of different sizes together through vulcanization of rubber, realizes coordinated deformation of the multiple shape memory alloy sheets, increases strength without increasing residual displacement of the device, effectively utilizes the performance advantages of small residual displacement and strong deformation capacity of the shape memory alloy sheets, and makes practical engineering application of the shape memory alloy sheets possible.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] A laminated U-shaped shape memory alloy damper, comprising a connecting piece a, a connecting piece b, a laminated U-shaped shape memory alloy sheet a, and a laminated U-shaped shape memory alloy sheet b, wherein the laminated U-shaped shape memory alloy sheet a and the laminated U-shaped shape memory alloy sheet b are oppositely arranged and connected by the connecting piece a and the connecting piece b.

[0008] Both ends of the connecting piece a are provided with counterbores a, both ends of the connecting piece b are provided with counterbores b, and counterbores bolts are arranged in the counterbores a and the counterbores b; the middle parts of the connecting piece a and the connecting piece b are provided with multiple bolt holes for connecting with a building structure.

[0009] The laminated U-shaped shape memory alloy sheet a and the laminated U-shaped shape memory alloy sheet b are both composed of multiple layers of U-shaped shape memory alloy sheets and multiple layers of U-shaped rubber cushion layers.

[0010] The connecting piece a and the connecting piece b are recessed with square grooves at the ends, the ends of the laminated U-shaped shape memory alloy sheet a and the laminated U-shaped shape memory alloy sheet b are provided with openings corresponding to the counterbores a and the counterbores b; the ends of the laminated U-shaped shape memory alloy sheet a and the laminated U-shaped shape memory alloy sheet b extend into the square grooves and are connected together by multiple counterbores bolts.

[0011] Further, the connecting piece a and the connecting piece b are both front-opening steel plates, and square grooves are symmetrically opened at the left and right ends, the height of the square grooves is L2; the thickness of the laminated U-shaped shape memory alloy sheet a and the laminated U-shaped shape memory alloy sheet b is also L2.

[0012] Further, the counterbores a are symmetrically arranged at the left and right ends of the connecting piece a, and the counterbores b are symmetrically arranged at the left and right ends of the connecting piece b.

[0013] Further, the bolt holes are arranged in a matrix form and symmetrically arranged in the middle of the connecting piece a and the connecting piece b.

[0014] Further, the laminated U-shaped shape memory alloy plate a and the laminated U-shaped shape memory alloy plate b are each composed of N U-shaped shape memory alloy sheets and N-1 U-shaped rubber pads, N is a positive integer, and each includes two straight sections and an arc transition section, the lengths of the two straight sections are L1, the thicknesses of the two straight sections are T1, the arc transition section is a semicircle with different radii, the two straight sections are tangent to the arc transition section, the inner diameter of the innermost U-shaped shape memory alloy sheet is R1, and the outer diameter of the outermost U-shaped shape memory alloy sheet is R2, and the parameters N, L1, T1, R1, and R2 can be determined according to actual engineering.

[0015] Further, the thickness of each U-shaped shape memory alloy sheet in the laminated U-shaped shape memory alloy plate a and the laminated U-shaped shape memory alloy plate b is T1, and can be flexibly designed and adjusted according to actual engineering requirements.

[0016] Further, when the building structure vibrates due to the action of an earthquake, the connecting piece a and the connecting piece b will move relatively, thereby causing the laminated U-shaped shape memory alloy plate a and the laminated U-shaped shape memory alloy plate b connected to the two ends of the connecting piece a and the connecting piece b to deform; when an earthquake occurs, the device provides damping force for the building structure, enhances the energy dissipation capacity of the structure, and reduces the vibration amplitude of the building structure; when the earthquake ends, the device provides sufficient resetting capacity for the building structure, reduces or even eliminates the residual displacement of the building structure, and realizes rapid recovery of the function of the structure after the earthquake.

[0017] The present application can achieve the following technical effects:

[0018] (1) The multiple shape memory alloy sheets of different sizes are bonded together through vulcanization of the rubber, and the deformation capacity is strong and the occupied space is small;

[0019] (2) The device has high strength, small residual displacement, and strong deformation capacity by taking advantage of the performance of the U-shaped shape memory alloy sheet;

[0020] (3) The multiple shape memory alloy sheets of different sizes have different yield displacements, can realize multi-stage yield, and realize phased seismic design;

[0021] (4) The two groups of laminated U-shaped shape memory alloy plates are symmetrically arranged, when one group of laminated U-shaped shape memory alloy plates deforms inward, the other group of laminated U-shaped shape memory alloy plates deforms outward, and the strength is symmetrical;

[0022] (5) The damage of the damper is mainly concentrated in the laminated U-shaped shape memory alloy plates, the two groups of laminated U-shaped shape memory alloy plates are connected to the connecting piece a and the connecting piece b by bolts, and if the laminated U-shaped shape memory alloy plates are damaged after the earthquake, they can be quickly disassembled and replaced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the stacked U-shaped shape memory alloy damper of the present invention;

[0024] Figure 2 This is a cross-sectional view (AA) of the stacked U-shaped shape memory alloy damper of the present invention;

[0025] Figure 3 This is a BB cross-sectional view of the stacked U-shaped shape memory alloy damper of the present invention;

[0026] Figure 4 The laminated U-shaped shape memory alloy plate is the laminated U-shaped shape memory alloy damper of the present invention. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-4 The present invention will be further described in detail below to facilitate a clear understanding of the invention, but these descriptions do not constitute a limitation thereof.

[0028] As attached Figure 1 As shown, this embodiment of a stacked U-shaped shape memory alloy damper includes a connector a1, a connector b2, a stacked U-shaped shape memory alloy plate a3, and a stacked U-shaped shape memory alloy plate b4. The stacked U-shaped shape memory alloy plates a3 and b4 are arranged opposite to each other and connected by connectors a1 and b2. Connector a1 has countersunk holes a11 at both ends, and connector b2 has countersunk holes b21 at both ends. Countersunk bolts 5 are installed in both countersunk holes a11 and b21. Multiple bolt holes 12 are provided in the middle of connectors a1 and b2 for connection to the building structure. The stacked U-shaped shape memory alloy plates a3 and b4 are both composed of multiple layers of U-shaped shape memory alloy thin plates 31 and multiple layers of U-shaped rubber pads 32. Figure 3 As shown, connectors a1 and b2 have recessed square grooves at their ends, and stacked U-shaped shape memory alloy plates a3 and b4 have openings at their ends, corresponding to countersunk holes a11 and b21. The ends of stacked U-shaped shape memory alloy plates a3 and b4 extend into the square grooves and are connected together by multiple countersunk bolts 5.

[0029] In this embodiment, as Figure 2As shown, the connecting piece a1 and the connecting piece b2 are both front opening steel plates, and square grooves are symmetrically opened at the left and right ends, and the height of the square groove is L2. The thickness of the stacked U-shaped shape memory alloy plate a3 and the stacked U-shaped shape memory alloy plate b4 is also L2. The counterbores a11 are symmetrically arranged at the left and right ends of the connecting piece a1, and the counterbores b21 are symmetrically arranged at the left and right ends of the connecting piece b2. The bolt holes 12 are arranged in a matrix, and are symmetrically arranged in the middle of the connecting piece a1 and the connecting piece b2, and there are 12 of them.

[0030] As shown in the figure, Figure 4 The stacked U-shaped shape memory alloy plate a3 and the stacked U-shaped shape memory alloy plate b4 are both composed of 6 U-shaped shape memory alloy sheets 31 and 5 U-shaped rubber pad layers 32, which include two straight sections and one circular arc transition section, the length of the two straight sections is L1, and the thickness is T1, the circular arc transition section is a semicircle with different radii, and the two straight sections are tangent to the circular arc transition section, the inner diameter of the innermost U-shaped shape memory alloy sheet 31 is R1, and the outer diameter of the outermost U-shaped shape memory alloy sheet 31 is R2, and the parameters N, L1, T1, R1 and R2 can be determined according to the actual engineering. In addition, the thickness of each U-shaped shape memory alloy sheet 31 in the stacked U-shaped shape memory alloy plate a3 and the stacked U-shaped shape memory alloy plate b4 is T1, which can be designed and adjusted flexibly according to the actual engineering requirements.

[0031] When the building structure vibrates due to the action of earthquake, it will drive the connecting piece a1 and the connecting piece b2 to move relatively, and then cause the stacked U-shaped shape memory alloy plate a3 and the stacked U-shaped shape memory alloy plate b4 connected at the two ends of the connecting piece a1 and the connecting piece b2 to deform. When the earthquake occurs, it provides damping force for the building structure, enhances the energy dissipation capacity of the structure, and reduces the vibration amplitude of the building structure. When the earthquake is over, it provides sufficient resetting ability for the building structure, reduces or even eliminates the residual displacement of the building structure, and realizes the rapid recovery of the function of the structure after the earthquake.

[0032] In this embodiment, multiple shape memory alloy sheets of different sizes are bonded together through vulcanization of rubber, and the deformation capacity is strong and the space occupied is small. By taking advantage of the performance of the U-shaped shape memory alloy sheet, the device can provide high strength, small residual displacement and strong deformation capacity. By using multiple shape memory alloy sheets of different sizes, multi-stage yielding is achieved. Two groups of stacked U-shaped shape memory alloy plates are symmetrically arranged, when one group of stacked U-shaped shape memory alloy plates deforms inward, the other group must deform outward, achieving strength symmetry. The damage of the damper is mainly concentrated in the stacked U-shaped shape memory alloy plates, and the two groups of stacked U-shaped shape memory alloy plates are connected with the connecting piece a1 and the connecting piece b2 by counterbores, and if damaged after the earthquake, the stacked U-shaped shape memory alloy plates can be quickly disassembled and replaced.

[0033] The above is only the preferred embodiment of the present application, and does not limit the structure of the present application in any form. The arrangement and the number of uses of the present application are not limited to the example, and can be optimized according to the actual engineering. Any modification, equivalent change and decoration of the above embodiment according to the technical principle of the present application, which does not deviate from the technical scheme of the present application, is still within the scope of the technical scheme of the present application.

Claims

1. A laminated U-shaped shape memory alloy damper, characterized by: The laminated U-shaped shape memory alloy damper comprises a connecting piece a (1), a connecting piece b (2), a laminated U-shaped shape memory alloy plate a (3) and a laminated U-shaped shape memory alloy plate b (4), the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) are oppositely arranged, and the connecting piece a (1) and the connecting piece b (2) are connected between the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4); Both ends of the connecting piece a (1) are provided with counterbores a (11), both ends of the connecting piece b (2) are provided with counterbores b (21), and the counterbores a (11) and the counterbores b (21) are provided with counterbores bolts (5) therein; the connecting piece a (1) and the connecting piece b (2) are both provided with a plurality of bolt holes (12) in the middle portions thereof for being connected with a building structure; The laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) are both composed of a plurality of layers of U-shaped shape memory alloy thin plates (31) and a plurality of layers of U-shaped rubber pad layers (32). The connecting piece a (1) and the connecting piece b (2) are both recessed with square grooves at the end portions thereof, the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) are both provided with openings at the end portions thereof, the openings correspond to the counterbores a (11) and the counterbores b (21), and the end portions of the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) are inserted into the square grooves and connected together by the plurality of counterbores bolts (5).

2. A laminated U-shaped shape memory alloy damper according to claim 1, characterized in that: The connecting piece a (1) and the connecting piece b (2) are both front-opening steel plates, square grooves are symmetrically opened at the left and right ends thereof, and the height of the square grooves is L2; the thickness of the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) is also L2.

3. A laminated U-shaped SMA damper according to claim 1, characterized in that: The counterbores a (11) are symmetrically arranged at the left and right ends of the connecting piece a (1), and the counterbores b (21) are symmetrically arranged at the left and right ends of the connecting piece b (2).

4. The laminated U-shaped shape memory alloy damper of claim 1, wherein: The bolt holes (12) are arranged in a matrix form and symmetrically arranged in the middle portions of the connecting piece a (1) and the connecting piece b (2).

5. The laminated U-shaped shape memory alloy damper of claim 1, wherein: The laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) are both composed of N U-shaped shape memory alloy thin plates (31) and N-1 U-shaped rubber pad layers (32), N is a positive integer, each of the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) comprises two straight sections and an arc transition section, the lengths of the two straight sections are both L1, the thicknesses of the two straight sections are both T1, the arc transition section is a semicircle with different radii, the two straight sections are tangent to the arc transition section, the inner diameter of the innermost U-shaped shape memory alloy thin plate (31) is R1, the outer diameter of the outermost U-shaped shape memory alloy thin plate (31) is R2, and the parameters N, L1, T1, R1 and R2 can be determined according to actual engineering.

6. A laminated U-shaped shape memory alloy damper according to claim 5, characterized in that: The thickness of each U-shaped shape memory alloy thin plate (31) in the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) is T1, and can be designed and adjusted flexibly according to actual engineering requirements.

7. A laminated U-shaped SMA damper according to any one of claims 1-6, characterized in that: When the building structure vibrates due to the earthquake action, the connecting piece a (1) and the connecting piece b (2) will move relatively, and then the laminated U-shaped shape memory alloy plate a (3) and the laminated U-shaped shape memory alloy plate b (4) connected to the two ends of the connecting piece a (1) and the connecting piece b (2) will deform; when the earthquake occurs, the damping force is provided for the building structure, the energy dissipation capacity of the structure is enhanced, and the vibration amplitude of the building structure is reduced; when the earthquake ends, sufficient reset ability is provided for the building structure, the residual displacement of the building structure is reduced or even eliminated, and the function of the structure is quickly recovered after the earthquake.

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