Multi-dimensional control SMA-complex friction pendulum isolation system

Abstract

The present invention relates to a multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system, comprising a top plate, a bottom plate, and a slider, wherein the top plate has an upper sliding surface, the bottom plate has a lower sliding surface, a cable support is provided on the bottom plate, a shape memory alloy cable is provided between the top plate, the bottom plate, and the cable support, the slider is arranged between the upper and lower sliding surfaces of the top and bottom plates, and the slider can slide on the two sliding surfaces. The multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system of the present invention limits the displacement of the support by providing a shape memory alloy cable, thereby preventing the support from being damaged due to large displacement under the action of a strong earthquake, thereby improving the seismic isolation performance of the support; at the same time, under the action of a strong earthquake, the shape memory alloy cable is always in a tensile state, which can well exert its superelastic advantage.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure seismic isolation control, and particularly relates to a multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system. Background Art

[0002] The seismic design of traditional buildings and bridges mainly relies on the strength, stiffness and ductility of the components themselves to meet the seismic requirements. However, in recent years, with the increasing complexity of structural systems, conventional seismic design methods have become increasingly difficult to meet the requirements of structural safety and applicability. The use of vibration control technology can better meet the requirements of structural seismic performance. Seismic isolation technology is an effective vibration control technology that has been widely used in construction and bridge engineering. The friction pendulum bearing is a seismic isolation sliding system that has a self-resetting mechanism and good stability through a specific arc surface. It extends the natural vibration period of the structure, isolates seismic energy through the sliding of the internal slider, and uses contact friction to consume seismic energy. The complex friction pendulum bearing is a new type of seismic isolation bearing with two upper and lower sliding surfaces. Under the same parameters, the displacement capacity can be doubled compared to the friction pendulum bearing with a single sliding surface.

[0003] Chinese utility model patent publication number CN207109570U discloses a friction pendulum bearing comprising an upper sliding plate, a lower sliding plate, and a spherical cap positioned therebetween. A bottom basin is fixedly mounted on the lower sliding plate, with the convex surface of the spherical cap mating with the upper concave surface of the bottom basin. The lower surface of the upper sliding plate is concave, and the bottom surface of the spherical cap abuts the lower surface of the upper sliding plate. This friction pendulum bearing, through the sliding movement between the upper sliding plate, the bottom basin, and the spherical cap, meets the displacement requirements of vibrations in different directions. It features a simple structure, low cost, and high applicability. Connectors further cushion displacement and connect the upper and lower sliding plates, resulting in a stable structure.

[0004] Chinese invention patent publication number CN106522375B discloses a friction pendulum sliding support. The support comprises a first and second sliding block disposed between two spaced-apart first and second mounting plates, with through-holes formed in the centers of the first and second sliding blocks, into which elastic elements are placed. Friction plates at both ends of the elastic element, acting under pressure from the first and second mounting plates, rub against the first and second curved friction surfaces of the first and second mounting plates, respectively, to dissipate vibration energy.

[0005] The above friction pendulum bearings improve the displacement capacity, but lack effective limiting devices. Under the action of strong earthquakes, the bearings may overturn and dislocate due to excessive displacement, affecting the seismic isolation performance of the bearings. Summary of the Invention

[0006] In order to solve the technical problem in the above-mentioned prior art that the complex friction pendulum bearing may overturn and dislocate due to excessive displacement under the action of a strong earthquake, thereby causing damage to the bearing, the present invention provides a multi-dimensionally controlled SMA (Shape Memory Alloy, SMA)-complex friction pendulum seismic isolation system. The present invention sets a shape memory alloy cable to limit the displacement of the bearing, thereby preventing the bearing from being damaged due to large displacement under the action of a strong earthquake, and improving the seismic isolation performance of the bearing. At the same time, the multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system provided by the present invention can keep the shape memory alloy cable in a tension state under the action of a strong earthquake, and can give full play to its superelastic advantage.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0008] The multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system provided by the present invention includes a top plate, a bottom plate and a slider, the top plate has an upper sliding surface, the bottom plate has a lower sliding surface, a cable support is arranged on the bottom plate, a shape memory alloy cable is arranged between the top plate, the bottom plate and the cable support, the slider is arranged between the upper and lower sliding surfaces of the top plate and the bottom plate, and the slider can slide on the two sliding surfaces.

[0009] In the present invention, a slider is arranged between the sliding surface of the top plate and the lower sliding surface of the bottom plate. The multi-dimensionally controlled SMA-complex friction pendulum isolation system of the present invention includes shape memory alloy cables to limit the multi-dimensional displacement of the bearing and dissipate seismic energy. This prevents the bearing from excessive displacement even under strong earthquakes, protecting the bearing and improving its isolation performance. Furthermore, the multi-dimensionally controlled SMA-complex friction pendulum isolation system includes two upper and lower sliding surfaces, which increase the bearing's displacement capacity.

[0010] Preferably, the upper sliding surface of the top plate and the lower sliding surface of the bottom plate are both concave surfaces.

[0011] In the present invention, both the upper sliding concave surface and the lower sliding concave surface are curved surfaces.

[0012] In any of the above technical solutions, it is preferred that the curvature radii of the upper and lower sliding surfaces are the same.

[0013] In any of the above technical solutions, preferably, the curvature radii of the upper and lower sliding surfaces are different.

[0014] In the present invention, when the curvature radii of the upper and lower sliding surfaces of the top plate and the bottom plate are different, the adaptability of the multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system is improved.

[0015] In any of the above technical solutions, preferably, there are multiple cable supports.

[0016] In any of the above technical solutions, preferably, there are multiple shape memory alloy cables.

[0017] In any of the above technical solutions, it is preferred that the plurality of cable supports and the plurality of shape memory alloy cables are evenly arranged around the multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system.

[0018] In any of the above technical solutions, it is preferred that the angles and numbers of the cable supports and the shape memory alloy cables can be adjusted as needed.

[0019] In any of the above technical solutions, it is preferred that the angle between each cable support is 45 degrees.

[0020] In any of the above technical solutions, it is preferred that the angles between the cable supports are adjusted according to actual conditions.

[0021] In any of the above technical solutions, preferably, the angles between the shape memory alloy cables are adjusted as needed.

[0022] In any of the above technical solutions, preferably, shape memory alloy cables are evenly arranged along the periphery between the top plate and the bottom plate, and the upper and lower ends of the shape memory alloy cables are fixedly connected to the top plate and the bottom plate respectively through clamps.

[0023] In any of the above technical solutions, preferably, the slider is an integral structure.

[0024] In any of the above technical solutions, preferably, the slider is a split structure.

[0025] In any of the above technical solutions, it is preferred that the main structure of the slider is processed from any one of a cuboid, a cube, and a cylinder.

[0026] In any of the above technical solutions, it is preferred that the surface of the sliding block that cooperates with the sliding surface is a convex surface.

[0027] In the present invention, the upper sliding surface of the top plate and the lower sliding surface of the bottom plate are both concave surfaces, the surfaces of the slider that cooperate with the upper and lower sliding surfaces are convex surfaces, the slider is arranged between the upper and lower sliding surfaces, and the slider can slide on the two sliding surfaces.

[0028] In the present invention, the matching surface between the slider and the upper sliding surface is an upper convex surface, and the matching surface between the slider and the lower sliding surface is a lower convex surface, and both the upper and lower convex surfaces are curved surfaces.

[0029] In any of the above technical solutions, it is preferred that the upper sliding concave surface of the top plate is matched with the upper convex surface of the slider to form a pair of arc sliding surfaces.

[0030] In any of the above technical solutions, it is preferred that the lower sliding concave surface of the bottom plate is matched with the lower convex surface of the slider to form another pair of arc sliding surfaces.

[0031] In any of the above technical solutions, it is preferred that the upper and lower convex surfaces of the slider are coated with polytetrafluoroethylene friction material.

[0032] In the present invention, the surfaces of the slider that match the upper and lower sliding surfaces are convex surfaces, and the upper convex surface of the slider that matches the upper sliding surface and the lower convex surface of the slider that matches the lower sliding surface are both coated with polytetrafluoroethylene friction material.

[0033] In any of the above technical solutions, preferably, the multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system has a circular shape, and the top and bottom surfaces have the same structure.

[0034] In any of the above technical solutions, preferably, eight shape memory alloy cables and eight cable supports are arranged.

[0035] In any of the above technical solutions, it is preferred that the shape memory alloy cable is formed by winding a plurality of shape memory alloy wires, and the number of the wires has no fixed value.

[0036] In any of the above technical solutions, preferably, the diameter of the shape memory alloy wire is 1 mm, 0.5 mm, 1.5 mm or a combination thereof.

[0037] Compared with the prior art, the above technical solution of the present invention has the following beneficial effects:

[0038] The present invention utilizes shape-memory alloy cables to limit bearing displacement, preventing damage to the bearing caused by significant displacement during strong earthquakes and improving its seismic isolation performance. Furthermore, the shape-memory alloy cables remain in tension during strong earthquakes, effectively leveraging their superelastic properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A structural front view of a preferred embodiment of a multi-dimensionally controlled SMA-complex friction pendulum isolation system according to the present invention;

[0041] Figure 2 For multi-dimensional control of SMA-complex friction pendulum isolation system according to the present invention Figure 1a top view of the illustrated embodiment;

[0042] Figure 3 For multi-dimensional control of SMA-complex friction pendulum isolation system according to the present invention Figure 1 An enlarged schematic diagram of the shape memory alloy cable structure of the illustrated embodiment;

[0043] Figure 4 A schematic diagram of a slider structure of a multi-dimensionally controlled SMA-complex friction pendulum isolation system according to the present invention;

[0044] Figure 5 A schematic diagram of another structure of a slider of a multi-dimensionally controlled SMA-complex friction pendulum isolation system according to the present invention;

[0045] Figure 6 Schematic diagram of the system motion state of the multi-dimensionally controlled SMA-complex friction pendulum isolation system according to the present invention;

[0046] Figure 7 is a three-dimensional structural diagram of the multi-dimensionally controlled SMA-complex friction pendulum isolation system according to the present invention;

[0047] Figure 8 For multi-dimensional control of SMA-complex friction pendulum isolation system according to the present invention Figure 8 The main view of the system structure is shown.

[0048] Reference numerals: 1. top plate, 2. bottom plate, 3. slider, 4. cable support, 5. shape memory alloy cable, 6. clamp. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] To overcome the technical problem in existing complex friction pendulum bearings that can experience excessive displacement under strong earthquakes, leading to overturning and dislocation, which can lead to bearing damage, the present invention proposes a multi-dimensionally controlled SMA-complex friction pendulum isolation system. This system utilizes shape memory alloy cables to limit bearing displacement, preventing damage from large displacements under strong earthquakes and improving the bearing's isolation performance. Furthermore, under strong earthquakes, the shape memory alloy cables are always in tension, effectively leveraging their superelastic properties.

[0051] Example 1

[0052] This embodiment provides a multi-dimensional control SMA-complex friction pendulum isolation system, such as Figures 1 to 2 As shown, the system comprises a top plate 1, a slider 3, and a bottom plate 2. The top plate 1 has an upper sliding surface, the bottom plate 2 has a lower sliding surface, a cable support 4 is provided on the bottom plate 2, and shape memory alloy cables 5 are provided between the top plate 1, the bottom plate 2, and the cable support 4. The slider 3 is arranged between the upper and lower sliding surfaces of the top plate 1 and the bottom plate 2, and the slider 3 can slide on the two sliding surfaces. The shape memory alloy cables 5 are provided to limit the multi-dimensional displacement of the support and consume seismic energy, so that the support will not produce excessive displacement even under strong earthquakes, thereby protecting the support and improving its seismic isolation performance. At the same time, the upper and lower sliding surfaces are provided in the multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system to improve the displacement capacity of the support.

[0053] In the multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system described in this embodiment, the upper sliding concave surface of the top plate 1 and the lower sliding concave surface of the bottom plate 2 are both curved surfaces, and the surface of the slider 3 that matches the sliding surface is a convex surface; the upper sliding concave curved surface of the top plate 1 is matched with the upper convex curved surface of the slider 3 to form a pair of circular arc sliding surfaces, and the upper convex curved surface of the slider 3 can slide along the upper sliding concave curved surface of the top plate 1; the lower sliding concave curved surface of the bottom plate 2 is matched with the lower convex curved surface of the slider 3 to form another pair of circular arc sliding surfaces, and the lower convex curved surface of the slider 3 can slide along the lower sliding concave curved surface of the bottom plate 2. Shape memory alloy cables 5 are evenly arranged along the periphery between the top plate 1 and the bottom plate 2, and the upper and lower ends of the shape memory alloy cables 5 are fixedly connected to the top plate 1 and the bottom plate 2 respectively by clamps 6.

[0054] The multi-dimensionally controlled SMA-complex friction pendulum isolation system described in this embodiment has a circular shape, with identical top and bottom surfaces. Shape memory alloy cables 5 are arranged around the perimeter of the multi-dimensionally controlled SMA-complex friction pendulum isolation system, with their ends fixedly connected to the top plate 1 and bottom plate 2, respectively. Eight shape memory alloy cables 5 and eight cable supports 4 are provided.

[0055] In the multi-dimensionally controlled SMA-complex friction pendulum seismic isolation system described in this embodiment, the slider 3 is set to be a cylinder, and the two end faces of the cylinder are processed into curved surfaces with a certain curvature radius, and then the upper and lower convex surfaces of the slider 3 are coated with polytetrafluoroethylene friction material, and then respectively slidably matched with the sliding surfaces on the top plate 1 and the bottom plate 2. The curvature radii of the upper and lower sliding surfaces of the upper sliding concave surface of the top plate 1 and the lower sliding concave surface of the bottom plate 2 are set to be the same, and the curvature radius of the curved surface of the sliding surface of the slider 3 and the top plate 1 is the same as the curvature radius of the sliding surface of the top plate 1. Correspondingly, the curvature radius of the curved surface of the sliding surface of the slider 3 and the bottom plate 2 is the same as the curvature radius of the sliding surface of the bottom plate 2.

[0056] In this embodiment, the shape memory alloy cable 5 is as follows Figure 3As shown, it is composed of multiple strands of shape memory alloy wire. Under the action of an earthquake, the support cover plate moves horizontally, and the alloy wire is stretched accordingly, acting as an energy dissipation limiter. The number of strands of shape memory alloy wire that make up the shape memory alloy cable is not fixed, and its diameter can be 1mm, 0.5mm, 1.5mm, or a combination thereof. After the shape memory alloy wire is wound to form the shape memory alloy cable, it is fixed by a clamp 6, and the shape memory alloy cable 5 is connected to the top plate 1 and the bottom plate 2 through this clamp 6.

[0057] In this embodiment, the slider 3 can be Figure 1 As shown in the figure, it can also be made into an integral structure. Figure 4 、 Figure 5 The split structure shown or other reasonable structure.

[0058] The multi-dimensional control SMA-complex friction pendulum isolation system described in this embodiment has the following working principle (motion state): Figure 6 As shown, when an earthquake occurs, the multi-dimensionally controlled SMA-complex friction pendulum isolation system is affected by the earthquake, the top plate 1 is displaced, and the slider 3 begins to slide. The sliding of the slider 3 isolates the earthquake energy, and the earthquake energy is consumed through friction contact. At the same time, the shape memory alloy cable 5 is displaced. The shape memory alloy cable 5 begins to stretch, providing restoring force and tensile strength, while also consuming energy. When the shape memory alloy cable 5 reaches the predetermined displacement amplitude, the top plate 1 cannot continue to displace, thereby limiting the entire support and protecting the support from damage due to excessive displacement.

[0059] like Figures 7 to 8 As shown, the multi-dimensional control SMA-complex friction pendulum isolation system provided in this embodiment has an upper sliding surface on the top plate 1, a lower sliding surface on the bottom plate 2, a cable support 4 on the bottom plate 2, and a shape memory alloy cable 5 between the top plate 1, the bottom plate 2, and the cable support 4. The slider 3 is arranged between the upper and lower sliding surfaces of the top plate 1 and the bottom plate 2, and the slider 3 can slide on the two sliding surfaces. In this embodiment, the upper sliding surface of the top plate 1 and the lower sliding surface of the bottom plate 2 are both concave surfaces, and the surfaces of the slider 3 that mate with the upper and lower sliding surfaces are convex surfaces. The slider 3 is arranged between the upper and lower sliding surfaces, and the slider 3 can slide on the two sliding surfaces. The surface of the slider 3 that mates with the upper sliding surface is an upper convex surface, and the surface of the slider 3 that mates with the lower sliding surface is a lower convex surface, and both the upper and lower convex surfaces are curved surfaces. The surfaces of the slider 3 that mate with the upper and lower sliding surfaces are convex surfaces, and the upper convex curved surface of the slider 3 that mates with the upper sliding surface and the lower convex curved surface of the slider 3 that mates with the lower sliding surface are coated with polytetrafluoroethylene friction material. The multi-dimensionally controlled SMA-complex friction pendulum isolation system with the above structure can achieve the function of limiting energy consumption, restricting the excessive multi-dimensional displacement of the isolation system under strong earthquakes, protecting the isolation system from damage, and better exerting its isolation function. At the same time, this isolation system has two sliding surfaces, which improves the displacement output capacity.

[0060] Example 2

[0061] The multi-dimensionally controlled SMA-complex friction pendulum isolation system provided in this embodiment exhibits enhanced adaptability when the curvature radii of the upper and lower sliding surfaces of top plate 1 and bottom plate 2 differ. Specifically, unlike Example 1, the curvature radii of the sliding surface of bottom plate 2 and top plate 1 are set to differ. This allows the stiffness and damping characteristics of the friction pendulum bearing to change with its movement under different circumstances, thereby enhancing adaptability.

[0062] Example 3

[0063] The multi-dimensional control SMA-complex friction pendulum isolation system provided in this embodiment is different from that in Example 1 in that the main structure of the slider 3 is a rectangular parallelepiped, and the two end faces in the length direction of the rectangular parallelepiped are processed into curved surfaces with a certain curvature radius, and then coated with polytetrafluoroethylene friction material, and then slidably matched with the sliding surfaces on the top plate 1 and the bottom plate 2 respectively. The curvature radius of the curved surface of the sliding surface of the slider 3 and the top plate 1 is the same as the curvature radius of the sliding surface of the top plate 1. Correspondingly, the curvature radius of the curved surface of the sliding surface of the slider 3 and the bottom plate 2 is the same as the curvature radius of the sliding surface of the bottom plate 2.

[0064] Example 4

[0065] The multi-dimensional control SMA-complex friction pendulum seismic isolation system provided in this embodiment is different from that in Example 1 in that the main structure of the slider 3 is a cube, and any two mutually parallel end faces of the cube are processed into a curved surface with a certain curvature radius, and then coated with polytetrafluoroethylene friction material, and then slidably matched with the sliding surfaces on the top plate 1 and the bottom plate 2 respectively. The curvature radius of the curved surface of the slider 3 slidingly matched with the sliding surface of the top plate 1 is the same as the curvature radius of the sliding surface of the top plate 1. Correspondingly, the curvature radius of the curved surface of the slider 3 slidingly matched with the sliding surface of the bottom plate 2 is the same as the curvature radius of the sliding surface of the bottom plate 2.

[0066] Example 5

[0067] The multi-dimensionally controlled SMA-complex friction pendulum isolation system provided in this embodiment differs from that in Example 1 in that the cable supports and shape memory alloy cables are evenly arranged around the multi-dimensionally controlled SMA-complex friction pendulum isolation system. The angles and number of cable supports 4 and shape memory alloy cables 5 can be adjusted as needed. The angles between the cable supports 4 can be 45 degrees, and the angles between the cable supports 4 can also be adjusted based on actual conditions. The angles between the shape memory alloy cables 5 can also be adjusted based on actual conditions.

[0068] Example 6

[0069] The multi-dimensional control SMA-complex friction pendulum isolation system provided in this embodiment is different from the above embodiments in that a shape memory alloy cable 5 can be directly provided on the basis of the existing single sliding surface friction pendulum support to play a role in limiting and absorbing energy.

[0070] The above description is only a description of the preferred embodiment of the present invention and is not intended to limit the scope of the present invention; the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention; without departing from the design spirit of the present invention, any modification, equivalent substitution, improvement, etc. made to the technical solution of the present invention by ordinary engineering and technical personnel in this field shall fall within the scope of protection determined by the claims of the present invention.

Claims

1. A multi-dimensionally controlled SMA-complex friction pendulum isolation system, comprising a top plate, a bottom plate, and a slider, characterized in that: The top plate has an upper sliding surface, the bottom plate has a lower sliding surface, a cable support is arranged on the bottom plate, and a shape memory alloy cable is arranged between the top plate, the bottom plate and the cable support. One end of the shape memory alloy cable is fixedly connected to the bottom plate, and the other end is fixedly connected to the top plate, and a certain section in the middle is lifted up by the cable support. The slider is arranged between the upper and lower sliding surfaces of the top plate and the bottom plate, and the slider can slide on the two sliding surfaces; the number of the cable supports is multiple, the number of the shape memory alloy cables is multiple, and the multiple cable supports and the multiple shape memory alloy cables are evenly arranged around the multi-dimensional control SMA-complex friction pendulum seismic isolation system.

2. The multi-dimensionally controlled SMA-complex friction pendulum isolation system according to claim 1, characterized in that: The upper sliding surface of the top plate and the lower sliding surface of the bottom plate are both concave surfaces.

3. The multi-dimensionally controlled SMA-complex friction pendulum isolation system according to claim 2, characterized in that: The curvature radii of the upper and lower sliding surfaces are the same.

4. The multi-dimensionally controlled SMA-complex friction pendulum isolation system according to claim 2, characterized in that: The curvature radii of the upper and lower sliding surfaces are different.

5. The multi-dimensionally controlled SMA-complex friction pendulum isolation system according to claim 1, characterized in that: The angles and numbers of the cable supports and shape memory alloy cables can be adjusted as needed.

6. The multi-dimensionally controlled SMA-complex friction pendulum isolation system according to claim 5, characterized in that: The angle between each cable support is 45 degrees.

7. The multi-dimensionally controlled SMA-complex friction pendulum isolation system according to claim 5, characterized in that: The angles between each cable support are adjusted according to actual conditions.

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