Staged adaptive variable curvature friction seismic mitigation and isolation support

Abstract

The utility model discloses a staged adaptive variable curvature friction seismic mitigation and isolation support which is characterized in that a second sliding block is placed on a lower connecting seat, and the second sliding block and the lower connecting seat form a second curved surface sliding surface; the first sliding block is placed on the second sliding block, and the first sliding block and the second sliding block form a first curved sliding face. The internal spherical crown is placed on the first sliding block and forms a rotary contact sliding surface with the first sliding block; the upper connecting seat is placed in the internal spherical crown and forms a horizontal sliding surface with the internal spherical crown; second check blocks are installed on the two sides of the upper surface of the lower connecting base through shear pins, first check blocks are installed on the two sides of the upper surface of the second sliding block, the first check blocks are elastic pieces, and the two sides of the lower surface of the upper connecting base extend downwards to be provided with upper check blocks. The device is easier to reset under small earthquakes and better in energy consumption under large earthquakes.

Description

Technical Field

[0001] This utility model relates to the technical field of disaster prevention and mitigation, and in particular to a phased adaptive variable curvature friction damping and isolation bearing. Background Technology

[0002] Earthquakes, as typical low-probability, high-loss natural disasters, are highly uncertain in their occurrence. Earthquake-resistant and disaster-mitigation design must consider the structural functionality, damage, and collapse prevention requirements under different earthquake probabilities. my country's "Code for Seismic Design of Buildings" requires engineering structures to meet the tiered performance objectives of "no damage in minor earthquakes, repairable in moderate earthquakes, and no collapse in major earthquakes."

[0003] Traditional seismic isolation and damping technologies often employ a two-state operating mode: under the reference earthquake, it operates in an elastic state; once a threshold is exceeded, it triggers a damping and isolation state through weak points such as shear pins. This two-state operating mode has the following technical drawbacks: 1. The state abrupt change effect is more significant. When using brittle transition devices such as shear pins, the system stiffness undergoes a significant step change at the critical point, easily leading to amplified effects; 2. Probabilistic mismatch. Although current standards propose a multi-level fortification concept, existing product parameters are fixed, making it difficult to achieve multi-objective coordinated control under minor, moderate, and major earthquakes.

[0004] In existing technologies, such as CN203393605U, variable curvature technology is used to improve the adaptability of the bearing. However, it is mainly used to eliminate the resonance phenomenon caused by long-period seismic waves and cannot avoid the two-state working mode defects of traditional seismic isolation technology.

[0005] In view of the above-mentioned problems, it is necessary to propose a seismic isolation bearing with different reset, energy dissipation and limiting capabilities under earthquakes of different probabilities, so as to match and adapt the bearing to the structural function and disaster prevention requirements. Utility Model Content

[0006] In view of this, in order to solve the above problems, the purpose of this utility model is to provide a staged adaptive variable curvature friction damping and isolation bearing, which includes:

[0007] Lower connecting seat, upper connecting seat, first slider, second slider, inner spherical crown, first stop, second stop;

[0008] The second slider is placed on the lower connecting seat and forms a second curved sliding surface with the lower connecting seat;

[0009] The first slider is placed on the second slider, and together with the second slider, they form the first curved sliding surface;

[0010] The inner spherical cap is placed on the first slider and forms a rotational contact sliding surface with the first slider;

[0011] The upper connecting seat is placed on the inner spherical cap and forms a horizontal sliding surface with the inner spherical cap;

[0012] The second stop is installed on both sides of the upper surface of the lower connecting seat by shear pins, the first stop is installed on both sides of the upper surface of the second slider, the first stop is an elastic-plastic part, and the upper stop is provided on both sides of the lower surface of the upper connecting seat.

[0013] The outer edge of the first slider can abut against the upper stop block, thereby restricting the sliding of the first curved sliding surface;

[0014] The outer edge of the second slider can abut against the second stop, and the inner edge of the first slider can abut against the upper stop through the first stop, thereby restricting the sliding of the second curved sliding surface.

[0015] In the aforementioned staged adaptive variable curvature friction damping and isolation bearing, a connecting block is provided on the edge of the upper surface of the lower connecting seat, and the second stop block is installed on the connecting block.

[0016] In the aforementioned staged adaptive variable curvature friction damping and isolation bearing, the edge of the second slider protrudes upward and bends outward to form an action plate. The outer edge of the action plate abuts against the second stop, and the first slider is mounted on the upper surface of the action plate.

[0017] The aforementioned staged adaptive variable curvature friction damping and isolation bearing further includes: a cable; one end of the cable is fixedly installed on the upper connecting seat; the other end of the cable is installed on the lower connecting seat.

[0018] In the aforementioned staged adaptive variable curvature friction damping and isolation bearing, the lower surface of the first slider is provided with a stainless steel plate, and the upper surface of the second slider is provided with a PTFE sliding plate, so that the first curved sliding surface formed by the lower surface of the first slider and the upper surface of the second slider is a friction sliding surface.

[0019] The aforementioned staged adaptive variable curvature friction damping and isolation bearing includes a first slider comprising: a blocking block, a tensile anchor bolt, and a stop block; the tensile anchor bolt passes through the blocking block to fix the blocking block to the second slider, and a first contact gap is provided between the blocking block and the upper stop block; one end of the stop block is installed on the lower surface of the blocking block, and the other end of the stop block is installed on the second slider.

[0020] The aforementioned staged adaptive variable curvature friction damping and isolation bearing has a friction coefficient μ1 of 0.02 to 0.04 for the first curved sliding surface and a radius R1, where R1∈(2,4)m.

[0021] The aforementioned staged adaptive variable curvature friction damping and isolation bearing has a friction coefficient μ2 of 0.08 to 0.20 for the second curved sliding surface and a radius of R2, where R2 ∈ (3, 6) m and R2 > R1.

[0022] In the aforementioned staged adaptive variable curvature friction damping and isolation bearing, an upper connecting anchor is installed on the upper surface of the upper connecting seat, and a lower connecting anchor is installed on the lower surface of the lower connecting seat.

[0023] In the aforementioned staged adaptive variable curvature friction damping and isolation bearing, a second contact gap is provided between the outer edge of the first slider and the upper stop block.

[0024] The positive effects of the above technical solution compared with the existing technology are:

[0025] 1. In this device, the first curved sliding surface and the second curved sliding surface adopt different curvatures and different friction coefficients, so that it is easier to reset under small shocks and better to consume energy under large shocks.

[0026] 2. The first and second blocks of this device adopt different failure mechanisms, which enhances the energy consumption and reset capability.

[0027] 3. This device uses first and second blocks with different failure mechanisms, which effectively reduces the adverse effects of sudden changes in the vibration isolation state of the support.

[0028] 4. This device uses cables to reduce the probability of overall support failure.

[0029] 5. The first and second curved sliding surfaces of this device have multiple curvatures, which improves the stability and adaptability of the support's vibration reduction and isolation function. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a phased adaptive variable curvature friction damping and isolation bearing according to the present invention.

[0031] Figure 2 This is a schematic diagram of the first stop block in this utility model.

[0032] Figure 3 This is a schematic diagram of the second stop block in this utility model.

[0033] 1. Upper connecting seat; 2. Inner spherical cap; 3. Horizontal sliding surface; 4. Rotational contact sliding surface; 5. First slider; 6. First curved sliding surface; 7. Lower connecting seat; 8. Second curved sliding surface; 9. First stop block; 91. Blocking block; 92. Stop block; 93. Tensile anchor bolt; 10. Second slider; 11. Second stop block; 12. Upper stop block; 13. Cable; 14. Upper connecting anchor bolt; 15. Lower connecting anchor bolt; 16. First contact gap; 17. Second contact gap; 18. Connecting block; 19. Action plate. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0035] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0036] like Figures 1 to 3 As shown, a preferred embodiment of a staged adaptive variable curvature friction damping and isolation bearing is illustrated, which includes: a lower connecting seat 7, an upper connecting seat 1, a first slider 5, a second slider 10, an inner spherical cap 2, a first stop block 9, and a second stop block 11.

[0037] The second slider 10 is placed on the lower connecting seat 7 and forms a second curved sliding surface 8 with the lower connecting seat 7; the first slider 5 is placed on the second slider 10 and forms a first curved sliding surface 6 with the second slider 10; the inner spherical cap 2 is placed on the first slider 5 and forms a rotational contact sliding surface 4 with the first slider 5; the upper connecting seat 1 is placed on the inner spherical cap 2 and forms a horizontal sliding surface 3 with the inner spherical cap 2; second stops 11 are installed on both sides of the upper surface of the lower connecting seat 7, and first stops 9 are installed on both sides of the upper surface of the second slider 10. The first stops 9 are elastic elements, and upper stops 12 are provided on both sides of the lower surface of the upper connecting seat 1; the outer edge of the first slider 5 can abut against the upper stops 12, thereby restricting the sliding of the first curved sliding surface 6; the outer edge of the second slider 10 can abut against the second stops 11, and the inner edge of the first slider 10 can abut against the upper stops 12 through the first stops 9, thereby restricting the sliding of the second curved sliding surface 8. Furthermore, the failure triggering horizontal force of the second stop 11 is greater than the failure triggering horizontal force of the first stop 9.

[0038] Furthermore, the first stop 9 and the second stop 11 have different working mechanisms. The first stop 9 exhibits an elastic-plastic ductile action process, while the second stop 11 undergoes a brittle rapid failure process. The first stop 9 provides a blocking and limiting function within a certain displacement range (generally 0-5cm).

[0039] In actual use, the upper surface of the lower connecting seat 7 is curved, and the lower surface is flat. Both the upper and lower surfaces of the second slider 10 are curved, forming a second curved sliding surface 8 between the lower surface of the second slider 10 and the upper surface of the lower connecting seat 7. The upper surface of the first slider 5 has a spherical cavity, which is curved. An internal spherical cap 2 is placed inside the cavity. The lower surface of the first slider 5 is also curved, forming a first curved sliding surface 6 between the lower surface of the first slider 5 and the upper surface of the second slider 10. The lower surface of the internal spherical cap 2 is curved and placed inside the cavity. The lower surface of the internal spherical cap 2 and the upper surface of the first slider 5 form a rotational contact sliding surface, providing rotational capability for the support. The upper surface of the internal spherical cap 2 is flat, and both the upper and lower surfaces of the upper connecting seat 1 are flat. The lower surface of the upper connecting seat 1 and the upper surface of the internal spherical cap 2 form a horizontal sliding surface 3.

[0040] Furthermore, as the earthquake intensity increases, the device operates in the following sequential states:

[0041] 1) Both the first stop 9 and the second stop 11 are in an elastic state, the first curved sliding surface 6 slides slightly, and the support is fully reset.

[0042] 2) The first stop 9 is in an elastic-plastic state, the first curved sliding surface 6 slides slightly, the second stop 11 is in an elastic state, and the support is strongly reset.

[0043] 3) The first stop 9 is in a failed state, the first curved sliding surface 6 slides freely, the second stop 11 is in an elastic state, and the support has a small residual displacement.

[0044] 4) The first stop 9 is in a failure state, and the second stop 11 is also in a failure state. The first curved sliding surface 6 slides and drives the second curved sliding surface 8 to slide freely, and works in sequence. The support is in a state of strong energy consumption and large vibration reduction and isolation cycle.

[0045] 5) The first curved sliding surface 6 slides, which in turn drives the second curved sliding surface 8 to slide, and they work in sequence. The limiting cable 13 plays a limiting and anti-failure role.

[0046] This device has three operating procedures:

[0047] Workflow 1: During the minor earthquake phase, the contact force between the first stop block 9 and the upper stop block 12 does not reach the threshold. At this time, the first curved sliding surface 6 remains stationary. This device satisfies the normal use of the whole through the horizontal sliding surface 3 and the rotating contact sliding surface 4.

[0048] Workflow 2: During the mid-earthquake phase, the contact force between the first stop block 9 and the upper stop block 12 exceeds the elastic threshold, causing the first stop block 9 to undergo plastic deformation. The first slider 5 slides along the first curved sliding surface 6 in a limited manner, consuming energy through friction and using the curvature of the first curved sliding surface 6 to provide a restoring force. The first stop block 9 may fail, and the entire device swings and consumes energy through friction on the first curved sliding surface 6.

[0049] Workflow 3: During the major earthquake phase, the shear pin of the second stop block 11 is sheared off, and the support has priority to swing and rub against the first curved sliding surface 6 to dissipate energy. When the horizontal force of the support is greater than the friction force on the second curved sliding surface 8, the second slider 10 slides along the second curved sliding surface 8. The high friction coefficient achieves strong energy dissipation and controls the displacement response of the support.

[0050] Based on the above, this utility model also has the following embodiments:

[0051] Furthermore, in a phased adaptive variable curvature friction damping and isolation bearing, a connecting block 18 is provided on the upper surface edge of the lower connecting seat 7, and a second stop block 11 is installed on the connecting block 18. The second stop block 11 is installed on the connecting block 18 by an anti-shear pin, which acts as a block against the second slider 10.

[0052] Furthermore, in a phased adaptive variable curvature friction seismic isolation bearing, the edge of the second slider 10 protrudes upward and bends outward to form an action plate 19. The outer edge of the action plate 19 abuts against the second stop 11, and the first stop 9 is installed on the upper surface of the action plate 19. Specifically, the second slider 10 generates an action force through the action plate 19 and the second stop 11. When the contact force between the action plate 19 and the second stop 11 exceeds the design threshold, the second stop 11 rapidly fails and falls off, and the second curved sliding surface 8 slides, dissipating seismic energy.

[0053] Furthermore, a phased adaptive variable curvature friction damping and isolation bearing further includes: a cable 13; one end of the cable 13 is fixedly installed on the upper connecting seat 1; the other end of the cable 13 is installed on the lower connecting seat 7. Specifically, when the horizontal displacement of the bearing approaches the bearing's ultimate displacement, the cable 13 plays a horizontal limiting constraint role, constraining the relative displacement between the upper connecting seat 1 and the lower connecting seat 7, providing a constraint and reset function, and preventing the bearing from failing and causing the beam to fall.

[0054] Furthermore, a phased adaptive variable curvature friction damping and isolation bearing is provided, wherein the lower surface of the first slider 5 is provided with a stainless steel plate, and the upper surface of the second slider 10 is provided with a PTFE sliding plate, so that the first curved sliding surface 6 formed by the lower surface of the first slider 5 and the upper surface of the second slider 10 is a friction sliding surface. Specifically, under seismic action, the first slider 5 can undergo ball-pendulum friction sliding along the first curved sliding surface 6 to dissipate seismic energy and utilize the curved surface to provide restoring force.

[0055] Furthermore, the second curved sliding surface 8 can be a high-friction coefficient frictional sliding surface. Under seismic action, the second slider 10 can undergo ball-pendulum frictional sliding along the second curved sliding surface 8 to dissipate seismic energy and utilize the curved surface to provide restoring force.

[0056] Furthermore, the horizontal sliding surface 3 is also composed of a stainless steel plate and a PTFE sliding plate to form a friction sliding surface, providing the support with a certain sliding capacity under temperature load.

[0057] Furthermore, a phased adaptive variable curvature friction damping and isolation bearing is provided, wherein the first slider 5 includes: a blocking block 91, a tensile anchor bolt 93, and a stop block 92; the tensile anchor bolt 93 passes through the blocking block 91 and fixes the blocking block 91 to the second slider 10, and a first contact gap 16 is provided between the blocking block 91 and the upper stop block 12; one end of the stop block 92 is installed on the lower surface of the blocking block 91, and the other end of the stop block 92 is installed on the second slider 10. Specifically, the plastic deformation of the first slider 5 is mainly due to the plastic deformation of the tensile anchor bolt 93.

[0058] A first contact gap 16 is provided between the blocking block 91 and the upper blocking block 12. When the contact force between the two is less than the design threshold, the first blocking block 9 elastically limits the movement, so that the first curved sliding surface 6 basically does not slide relative to the other side. When the contact force between the two exceeds the design threshold, the first blocking block 9 elastically limits the movement, so that the first curved sliding surface 6 slides to a limited extent. At the same time, the first blocking block 9 provides a reset force and a certain energy dissipation capacity, further supplementing and improving the reset capability of the first curved sliding surface 6. When the first blocking block 9 completely fails, the action plate 19 has a shielding function to prevent the failed first slider 5 from falling into the second curved sliding surface 8 and causing adverse effects.

[0059] Furthermore, a phased adaptive variable curvature friction damping and isolation bearing is provided, wherein the friction coefficient μ1 of the first curved sliding surface 6 is 0.02 to 0.04, and the radius of the first curved sliding surface 6 is R1, where R1∈(2,4)m.

[0060] Furthermore, a staged adaptive variable curvature friction damping and isolation bearing is provided, wherein the friction coefficient μ2 of the second curved sliding surface 8 is 0.08–0.20, and the radius of the second curved sliding surface 8 is R2, where R2 ∈ (3, 6) m, and R2 > R1. Specifically, the friction coefficient of the first curved sliding surface 6 should be significantly smaller than that of the second curved sliding surface 8, and the radius of the first curved sliding surface 6 should be smaller than that of the second curved sliding surface 8. Reasonably, when the second stop 11 fails, the horizontal force of the second stop 11 should be greater than the horizontal force of the stop when the first stop 9 fails.

[0061] Furthermore, a phased adaptive variable curvature friction damping and isolation bearing is provided, wherein an upper connecting anchor 14 is installed on the upper surface of the upper connecting seat 1, and a lower connecting anchor 15 is installed on the lower surface of the lower connecting seat 7. Specifically, the upper connecting seat 1 and the lower connecting seat 7 are connected to external devices through the upper connecting anchor 14 and the lower connecting anchor 15.

[0062] Furthermore, a phased adaptive variable curvature friction damping and isolation bearing is provided, wherein a second contact gap 17 is provided between the outer edge of the first slider 5 and the upper stop block 12.

[0063] In a preferred embodiment, the preferred parameters of this device are:

[0064] The first curved sliding surface 6 has a radius of curvature R1 = 2~3m and a friction coefficient μ1 = 0.03;

[0065] The second curved sliding surface has a radius of curvature R2 = 4~6m and a friction coefficient μ2 = 0.12.

[0066] The failure threshold for the first block 9 is set at 10% of the design seismic force, and the failure threshold for the second block 11 is set at 20%.

[0067] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A phase-adaptive variable curvature frictional seismic mitigation bearing, comprising: The utility model relates to a kind of sliding mechanism, including: Lower connecting seat, upper connecting seat, first slider, second slider, inner spherical cap, first stop block, second stop block; Second slider is placed in lower connecting seat, and with the second curved surface sliding surface of lower connecting seat formation; First slider is placed in second slider, and with the first curved surface sliding surface of second slider formation; Inner spherical cap is placed in first slider, and with the rotary contact sliding surface of first slider formation; Upper connecting seat is placed in inner spherical cap, and with the horizontal sliding surface of inner spherical cap formation; The upper surface of lower connecting seat is installed with second stop block by shear pin on both sides, the upper surface of second slider is installed with first stop block on both sides, and first stop block is elastoplastic piece, the lower surface of upper connecting seat is provided with upper stop block downwardly on both sides; The outer edge of first slider can be resisted with upper stop block, to limit the sliding of first curved surface sliding surface; The outer edge of second slider can be resisted with second stop block, and the inner edge of first slider can be resisted with upper stop block by first stop block, to limit the sliding of second curved surface sliding surface.

2. The variable friction sliding isolation bearing according to claim 1, wherein, The edge of the upper surface of lower connecting seat is provided with connecting block upwardly, and second stop block is installed in connecting block.

3. The variable friction sliding isolation bearing according to claim 1, wherein, The edge of second slider is upwardly protruding, and is bent to form action plate towards the outside of second slider, the outer edge of action plate is resisted with second stop block, and first slider is installed on the upper surface of action plate.

4. The variable friction sliding isolation bearing according to claim 1, wherein, Further including: Cable; One end of cable is fixedly installed in upper connecting seat, and the other end of cable is installed in lower connecting seat.

5. The variable friction sliding isolation bearing according to claim 1, wherein, The lower surface of first slider is provided with stainless steel plate, and the upper surface of second slider is provided with four fluorine sliding plate, so that the first curved surface sliding surface formed by the lower surface of first slider and the upper surface of second slider is frictional sliding surface.

6. The variable friction sliding isolation bearing of claim 1, wherein, First slider includes: blocking block, anti-tension anchor bolt, non-slip block, anti-tension anchor bolt penetrates blocking block, and blocking block is fixedly installed in second slider, and first contact gap is arranged between blocking block and upper stop block, one end of non-slip block is installed on the lower surface of blocking block, and the other end of non-slip block is installed on second slider.

7. The variable friction sliding isolation bearing of claim 1, wherein, The friction coefficient μ1 of first curved surface sliding surface is 0.02-0.04, and the radius of first curved surface sliding surface is R1, wherein R1 belongs to (2, 4) m.

8. The phase-adaptive variable-stiffness friction-based seismic isolation bearing according to claim 7, wherein, The friction coefficient μ2 of second curved surface sliding surface is 0.08-0.20, and the radius of second curved surface sliding surface is R2, wherein R2 belongs to (3, 6) m, and R2>R1.

9. The phase-adaptive variable-stiffness friction-based seismic isolation bearing according to claim 1, wherein, Upper surface of upper connecting seat is installed with upper connecting anchor bolt, and lower surface of lower connecting seat is installed with lower connecting anchor bolt.

10. The phase-adaptive variable-stiffness friction-based seismic isolation bearing according to claim 1, wherein, Second contact gap is arranged between the outer edge of first slider and upper stop block.

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