Multi-stage property self-resetting friction sliding shock isolation device

Abstract

The invention relates to the technical field of building anti-seismic structures, in particular to a friction sliding assembly and a self-resetting device. The friction sliding assembly comprises an upper sliding plate and a lower sliding plate. The lower sliding plate is fixedly arranged; the upper sliding surface and the lower sliding surface are two crossed trapezoidal corrugated surfaces; the trapezoidal corrugated surface is divided into a horizontal section and an oblique wave section; the initial positions of the upper sliding surface and the lower sliding surface are that the horizontal sections of the two sliding surfaces are in contact, and the inclined sections are not in contact; the self-resetting device comprises a resetting assembly and a limiting side wall; the reset assembly comprises a guide rail, a sliding block and a compression spring. The guide rail is fixedly arranged on the top surface of the upper sliding plate; the two ends of the guide rail are each provided with a sliding block. The sliding blocks are connected through compression springs. Limiting side walls are arranged on the two sides of the reset assembly. The outer sides of the sliding blocks are slidably connected with the inner walls of the limiting side walls. By means of the device, the seismic mitigation and isolation function of the seismic mitigation and isolation support can be achieved in different states in a staged and targeted mode.

Description

Technical Field

[0001] The invention relates to the technical field of earthquake-resistant building structures, in particular to a multi-stage self-resetting friction sliding isolation device. Background Art

[0002] Seismic isolation technology can effectively reduce the impact of earthquake damage. Seismic isolation technology is to install seismic isolation bearings at the connection between the upper structure and the lower structure of the building to reduce the structural seismic response by changing the structural period and damping.

[0003] The friction coefficient and curvature radius of traditional friction pendulum bearings are constants, and the damping and stiffness provided by the bearings are also constants. They cannot accurately identify earthquakes. The shock-absorbing performance of the friction pendulum bearings does not change significantly under the action of earthquakes of different intensities. Under the action of rare and extremely rare earthquakes, the slip of the friction pendulum bearings will exceed their designed effective sliding displacement, causing damage to the bearings and further leading to structural earthquake damage.

[0004] Although the novel friction pendulum bearing disclosed in the prior art has a certain damping adaptive adjustment capability and solves certain problems in practical engineering, it still has the following shortcomings:

[0005] The limiting and resetting capabilities of the friction pendulum bearing are weak. Under the action of rare and extremely rare earthquakes, the bearing is prone to exceed the designed displacement deformation and be damaged.

[0006] When adapting to the temperature displacement of the superstructure due to thermal expansion and contraction, the friction pendulum bearing will inevitably rise vertically, which will make the superstructure such as the structure less smooth and easily cause damage to the expansion joint;

[0007] The existing structure adapts to the temperature displacement of thermal expansion and contraction and the seismic displacement suitable for seismic isolation. The friction coefficient of the friction pendulum bearing cannot be changed during operation, resulting in the inability to effectively release the structural strain during temperature displacement. At the same time, it is also unable to achieve excellent seismic reduction and isolation effects during seismic displacement. Summary of the invention

[0008] The purpose of the present application is to provide a multi-stage self-resetting friction sliding isolation device, aiming to solve the problems in the prior art.

[0009] The embodiment of the present application provides a multi-stage self-resetting friction sliding isolation device, including a friction sliding component and a self-resetting device; the friction sliding component includes an upper sliding plate and a lower sliding plate; the lower sliding plate is fixedly arranged; the bottom surface of the upper sliding plate intersects with the top surface of the lower sliding plate to form an upper sliding surface and a lower sliding surface respectively; the upper sliding surface and the lower sliding surface can slide relative to each other; the upper sliding surface and the lower sliding surface are two intersecting trapezoidal corrugated surfaces; the trapezoidal corrugated surfaces are divided into a horizontal section and an oblique section; the initial positions of the upper sliding surface and the lower sliding surface are that the horizontal sections of the two sliding surfaces are in contact, and the oblique sections are not in contact; the self-resetting device includes a reset component and a limiting side wall; the reset component includes a guide rail, a slider and a compression spring; the guide rail is fixedly arranged on the top surface of the upper sliding plate; a slider is arranged at each end of the guide rail; the sliders are connected by a compression spring; limiting side walls are arranged on both sides of the reset component; the outer side of the slider is slidably connected to the inner wall of the limiting side wall; the limiting side wall is fixed to the lower sliding plate.

[0010] Preferably, the upper sliding plate and the lower sliding plate are made of metal or rubber materials; and friction coatings are adhered to both the upper sliding surface and the lower sliding surface.

[0011] Preferably, the oblique wave angles of the oblique wave sections of the trapezoidal corrugated surface are all the same; the oblique wave angles are 10°-80°.

[0012] Preferably, the compression spring is always in a compressed state.

[0013] Preferably, a trapezoidal protrusion is provided on the limiting side wall; the trapezoidal protrusion is symmetrically arranged on the limiting side walls on both sides.

[0014] The beneficial effects of the present invention are as follows: the present invention can separate the normal use function of the seismic isolation bearing from the auxiliary functions under the action of loads such as earthquakes through the sliding of the upper sliding plate and the lower sliding plate on the contact surface of the horizontal section and the inclined section of the trapezoidal corrugated structure, and exert the seismic isolation function in a targeted manner in stages. Under the action of a relatively small horizontal force, the upper and lower sliding surfaces are only in contact in the horizontal section. At this time, only the upper vertical load is transmitted between the upper sliding plate and the lower sliding plate, and horizontal sliding or rotation occurs, balancing the horizontal displacement of the upper structure caused by thermal expansion and contraction, and at the same time having self-resetting ability. When a large earthquake occurs, the two inclined sections are in contact, and the upper sliding plate slides obliquely upward along the inclined section of the trapezoidal corrugation of the lower sliding plate, converting horizontal kinetic energy into position potential energy of the upper structure. At the same time, the mutual friction on the contact surface also consumes part of the seismic energy. At this time, the friction bearing enters the working stage of mutual conversion of kinetic energy and potential energy from the horizontal sliding working stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2for Figure 1 Sectional view of section AA.

[0017] Figure 3 for Figure 1 Cross-sectional view of the middle BB section.

[0018] Figure 4 It is a schematic diagram of the structure of the device of the present invention at the initial position.

[0019] Figure 5 It is a schematic diagram of the horizontal displacement structure of the device of the present invention under the action of a relatively small horizontal force.

[0020] Figure 6 It is a schematic diagram of the horizontal displacement structure of the device of the present invention under the action of a relatively large horizontal force.

[0021] In the figure:

[0022] 1. Upper sliding plate; 2. Lower sliding plate; 3. Upper sliding surface; 4. Lower sliding surface; 5. Horizontal section; 6. Oblique section; 7. Guide rail; 8. Slider; 9. Compression spring; 10. Limiting side wall; 11. Trapezoidal protrusion; 12. Center line of the device in the initial position; 13. Center line of the device after displacement. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] like Figures 1 to 3 A multi-stage self-resetting friction sliding isolation device shown in the figure comprises a friction sliding component and a self-resetting device; the friction sliding component comprises an upper sliding plate 1 and a lower sliding plate 2; the lower sliding plate 2 is fixedly arranged; the bottom surface of the upper sliding plate 1 intersects with the top surface of the lower sliding plate 2 to form an upper sliding surface 3 and a lower sliding surface 4 respectively; the upper sliding surface 3 and the lower sliding surface 4 can slide relative to each other; the upper sliding surface 3 and the lower sliding surface 4 are two intersecting trapezoidal corrugated surfaces; the trapezoidal corrugated surface is divided into a horizontal section 5 and an oblique section 6; the initial position of the upper sliding surface 3 and the lower sliding surface 4 is that the horizontal sections 5 of the two sliding surfaces are in contact, and the oblique section 5 is not in contact, as shown in FIG. Figure 4 shown.

[0025] Figure 4In the figure, the upper sliding surface has 5 horizontal segments and 4 oblique segments; the lower sliding surface also has 5 horizontal segments and 4 oblique segments. Under the action of a small horizontal force, the sliding between the upper sliding plate 1 and the lower sliding plate 2 only occurs between the upper and lower horizontal segments, and the oblique segments do not contact each other; as the horizontal force continues to increase, the two oblique segments contact, and the upper sliding plate 1 can slide up or down along the oblique segments on the lower sliding plate. The horizontal distance between the oblique segments at the initial position can be optimized and designed according to the size of the superstructure, the design seismic load, and the different requirements for the seismic performance of the bearings.

[0026] The self-resetting device includes a reset assembly and a limiting side wall 10; the reset assembly includes a guide rail 7, a slider 8 and a compression spring 9; the guide rail 7 is fixedly arranged on the top surface of the upper sliding plate 1; a slider 8 is arranged at each end of the guide rail 7; the sliders 8 are connected by compression springs 9; limiting side walls 10 are arranged on both sides of the reset assembly; the outer side of the slider 8 is slidably connected to the inner wall of the limiting side wall 10; the limiting side wall 10 is fixedly connected to the lower sliding plate 2.

[0027] The upper sliding plate 1 and the lower sliding plate 2 are made of metal or rubber materials; the upper sliding surface 3 and the lower sliding surface 4 are both pasted with friction coatings, such as special friction materials such as polytetrafluoroethylene.

[0028] The oblique wave angles of the oblique wave sections 6 of the trapezoidal corrugated surface are all the same; the oblique wave angles are 10°-80°. By selecting different oblique wave angles, friction coefficients of the contact surfaces, elastic stiffness of the compression springs and other parameters, the bearing can separate the normal use function and the auxiliary function during an earthquake, and can play a better role in a targeted manner in stages, and can also optimize the seismic isolation function and size of the bearing.

[0029] The compression spring 9 is always in a compressed state, providing an outward rebound force to the sliders 8 on both sides.

[0030] A trapezoidal protrusion 11 is provided on the limiting side wall 10; the trapezoidal protrusion 11 is symmetrically arranged on the limiting side walls 10 on both sides, and the slider 8 is initially located in the two trapezoidal protrusions 11. The trapezoidal protrusion 11 changes the distance between the two limiting side walls 10. When the slider 8 moves outward from the trapezoidal protrusion 11, the compression spring 9 is compressed inward to provide a restoring force to both sides.

[0031] Under normal use conditions (horizontal displacement of the upper structure caused by thermal expansion and contraction, or subjected to small horizontal forces), if Figure 5As shown, at this time, the displacement is small, the upper and lower horizontal sections 5 are in contact, and the upper vertical load is transmitted. Only relative sliding or rotation occurs on the horizontal section 5, and the oblique section 6 is not in contact. At this time, the slight horizontal displacement of the support caused by thermal expansion and contraction can be balanced; the upper sliding plate 1 is displaced while driving the guide rail 7 and the slider 8 to displace; the slider 8 slides on the limiting side wall 10 and leaves the trapezoidal protrusion 11, the spacing between the sliders 8 is reduced, and the spring is further compressed; the slider is returned to its position by relying on the rebound force generated by the compression spring 9, thereby realizing the spring reset function of the friction support.

[0032] When an earthquake occurs or a large horizontal force occurs, such as Figure 6 As shown, the relative displacement between the upper and lower horizontal segments reaches Ls, where Ls is the horizontal gap distance between the upper and lower oblique segments in the initial state. The horizontal segment 5 is dislocated, and the upper and lower oblique segments 6 are in contact. Under the action of the continuously increasing horizontal thrust, the upper sliding plate 1 will slide obliquely along the oblique segment on the lower sliding plate 2. Through such an action mechanism, not only can the kinetic energy of the upper structure be converted into gravitational potential energy, but it can also self-reset. In addition, through the friction on the sliding surface, part of the seismic energy is consumed, thereby realizing the auxiliary function of the bearing during an earthquake. During this working stage, the distance between the two limiting side walls 10 located on the lower sliding plate 2 remains unchanged, and the distance between the two sliders 8 located on the upper sliding plate 1 does not change during the movement. The compression spring 9 has no further compression trend, and the self-reset part does not play a role.

[0033] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A multi-stage self-resetting friction sliding isolation device, characterized in that: The cam is an angular movement mechanism which allows the cam to move in a direction of rotation and which allows the cam to move relative to the top of the sliding plate and to move relative to the top of the sliding plate.

2. The multi-stage self-resetting friction sliding isolation device according to claim 1 is characterized in that: The upper sliding plate and the lower sliding plate are made of metal or rubber materials; and friction coatings are pasted on the upper sliding surface and the lower sliding surface.

3. The multi-stage self-resetting friction sliding isolation device according to claim 1 is characterized in that: The oblique wave angles of the oblique wave sections of the trapezoidal corrugated surface are all the same; the oblique wave angles are 10°-80°.

4. The multi-stage self-resetting friction sliding isolation device according to claim 1 is characterized in that: The compression spring is always in a compressed state.

5. The multi-stage self-resetting friction sliding seismic isolation device according to claim 1 is characterized in that: The limiting side wall is provided with a trapezoidal protrusion; the trapezoidal protrusion is symmetrically arranged on the limiting side walls on both sides.

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