Flexible anti-drawing three-dimensional composite shock insulation support

Abstract

The invention discloses a flexible anti-drawing three-dimensional composite seismic isolation support which comprises an upper connecting plate, a middle connecting plate and a lower connecting plate. The upper connecting plate is used for being connected with a building, a vertical vibration isolation assembly is arranged between the upper connecting plate and the middle connecting plate and comprises a pressing block, a vertical elastic buffering piece and a guide rod arranged on the middle connecting plate, the guide rod is provided with a rail, and the pressing block is arranged on the rail in a sliding mode in the vertical direction. According to the novel three-dimensional composite shock insulation support, a vertical shock insulation structure and a transverse shock insulation structure are combined, the novel three-dimensional composite shock insulation support is formed, the horizontal shock insulation effect and the vertical shock insulation effect are achieved, and the novel three-dimensional composite shock insulation support has the advantages of being simple in structure and convenient to use. Under the action of complex three-way earthquakes, the seismic isolation requirement can be better met, and based on the energy consumption and the drawing resistance, the seismic isolation device has wider applicability in large-span structure seismic isolation and building seismic isolation with the large height-width ratio or uneven plane arrangement.

Description

Technical Field

[0001] The present invention relates to the technical field of building seismic isolation and isolation, and in particular to a flexible tensile three-dimensional composite isolation bearing. Background Art

[0002] Earthquake disasters occur frequently in China. With the rapid development of cities and the improvement of urbanization construction, the seismic problems of buildings such as houses and bridges have attracted much attention. Under the action of earthquakes, buildings will show damage forms such as bending, shearing or torsion. In severe cases, they will collapse due to excessive plastic deformation. The commonly used seismic isolation and isolation technology in engineering is to set up horizontal isolation bearings to reduce the horizontal stiffness of the isolation layer and extend the natural vibration period of the structure, so as to avoid the resonance frequency of the ground motion by the natural vibration frequency of the overall structure, thereby effectively reducing the dynamic response of the structure.

[0003] The earthquake action will not only transmit the horizontal seismic component to the upper structure, but also transmit the vertical seismic component. Research shows that the peak acceleration of vertical ground motion can be as high as 1 / 3 - 1 / 2 of the horizontal acceleration. At present, the existing isolation bearings only act on two-dimensional horizontal earthquakes and lack the isolation ability for vertical ground motion. In addition, when the vertical component of the earthquake is too large, it is easy for the isolation bearing to be in a tensile-shear stress state for a short time, and this state is more significant in the side columns and corner columns of buildings with a large height-width ratio or irregular plane. Research shows that the magnitude of the tensile force on the bearing is closely related to the tensile stiffness. The greater the stiffness, the greater the tensile force on the bearing. Currently, the isolation bearings with certain tensile functions that are applied include lead-rubber isolation bearings (LRB) and high-damping rubber bearings (HDB), etc. Although these bearings can bear a certain vertical tensile force during earthquakes, they also have many deficiencies. For example, under the action of tensile stress, the rubber material will be damaged due to the formation of a negative pressure state inside, resulting in a sharp decrease in the vertical compression stiffness and tensile stiffness, affecting the normal working state. Therefore, if the tensile and pull-out ability of the isolation bearing is very weak, it is easy to be damaged by tension and fail under large earthquakes, posing a certain safety hazard to the building and unable to ensure the safety of the isolated structure under earthquake action.

[0004] The three-dimensional isolation bearing is a composite isolation bearing formed by series combination of a horizontal isolation bearing and a vertical isolation bearing. Through reasonable design, the horizontal and vertical force decoupling can be achieved. If a vertical isolation bearing with a smaller vertical stiffness is used, the vertical natural vibration period of the upper structure can be extended, the vertical earthquake action can be reduced, and at the same time, increasing the vertical equivalent damping ratio of the bearing can further improve the damping effect. Currently, the existing vertical isolation bearings have different structural forms such as thick-layer rubber bearings, disc spring groups and air cushions, etc., but generally have problems of insufficient tensile bearing capacity and energy dissipation capacity. Therefore, it is very necessary to invent a three-dimensional isolation bearing with both vertical pull-out resistance and dissipation of vertical earthquake energy to reduce the dynamic response of the structure under complex three-dimensional ground motion.

[0005] Patent document CN201310099500.0 invented a sandwich rubber-high damping disc spring composite three-dimensional isolation bearing. The isolation bearing isolates the horizontal seismic action through a horizontal isolation bearing and isolates the vertical seismic action through a disc spring isolator. However, each component can only bear pressure and cannot be applied to engineering situations where tensile forces may occur under the column load during an earthquake.

[0006] Patent document CN201811470271.8 invented a tensile isolation bearing. The isolation bearing is in a pre-compressed state through an energized coil to improve the overall tensile capacity of the isolation bearing. However, the following problems exist in this invention:

[0007] (1) Under large horizontal deformations, the tension of the tensile elastomer may cause two-way force coupling, increasing the horizontal stiffness of the isolation bearing and affecting the original horizontal isolation effect.

[0008] (2) The structure is complex, the construction and assembly are difficult, and the later maintenance cost is high.

[0009] Patent document CN201821623232.2 invented a tensile-resistant isolation bearing. A lift-off cover is connected and arranged above the isolation bearing, and a lift-off limit member is provided to achieve a secondary defense protection. When the lift-off displacement exceeds the design displacement, the lift-off limit member transfers the tensile force, preventing the isolation bearing from detaching from the horizontal limit ring plate of the lift-off cover and causing horizontal load-bearing failure. At the same time, the tensile bearing capacity of the isolation bearing is used to bear a part of the earthquake tensile force exceeding the design expectation. The problems existing in this invention are:

[0010] (1) The provided lift-off limit device is usually used as a secondary defense in the seismic isolation and reduction design process. It does not participate in the overall force calculation and analysis under small and medium earthquakes. Under large earthquakes, the lift-off limit device belongs to a rigid connection, which will bring new problems such as inaccurate calculation of the bearing tensile force during the force calculation.

[0011] (2) The provided lift-off limit device only plays the role of releasing the vertical translational constraint and preventing the isolation bearing from bearing tensile forces, but cannot dissipate seismic energy.

[0012] Therefore, there is an urgent need for a flexible tensile-resistant three-dimensional composite isolation bearing that can effectively improve the tensile-resistant ability and vertical energy dissipation ability of the bearing. Summary of the Invention

[0013] In view of this, the present invention provides a flexible tensile-resistant three-dimensional composite isolation bearing, which has horizontal and vertical isolation effects, can better meet the isolation requirements under complex three-directional seismic actions, and has a wider applicability.

[0014] The flexible tensile-resistant three-dimensional composite isolation bearing provided by the present invention adopts the following technical solutions:

[0015] A flexible anti-pullout three-dimensional composite isolation bearing, comprising an upper connecting plate, a middle connecting plate and a lower connecting plate; the upper connecting plate is used to connect a building, a vertical vibration isolation component is arranged between the upper connecting plate and the middle connecting plate, the vertical vibration isolation component includes a pressing block, a vertical elastic buffer and a guide rod arranged on the middle connecting plate, the guide rod has a track, the pressing block is slidably arranged along the vertical direction on the track, the vertical elastic buffer is used to apply an upward pre-tightening force to the pressing block, and a lateral vibration isolation component for lateral vibration isolation is arranged between the lower connecting plate and the middle connecting plate.

[0016] Optionally, the vertical vibration isolation component further includes a viscoelastic damper arranged on the middle connecting plate, and the viscoelastic damper is used to apply an upward damping force to the upper connecting plate.

[0017] Optionally, a plurality of the viscoelastic dampers are arranged at a 90° angle between the upper connecting plate and the middle connecting plate, and the outer edges of the viscoelastic dampers are aligned with the outer edges of the upper connecting plate and the middle connecting plate.

[0018] Optionally, the vertical elastic buffer includes a plurality of disc spring groups coaxially sleeved on the guide rod, the disc spring groups are composed of a plurality of disc spring sheets being butted and stacked, and the pressing block is arranged on the top surface of the disc spring groups.

[0019] Optionally, the guide rod has a chassis and a vertical rod fixedly arranged on the chassis, the chassis is arranged on the middle connecting plate, the disc spring groups are coaxially arranged on the vertical rod, the outer diameter of the chassis is larger than the outer diameter of the disc spring sheets, and the inner diameter of the chassis is smaller than the inner diameter of the disc spring sheets.

[0020] Optionally, the number of butt joints i of the disc spring groups and the theoretical equivalent stiffness k of the disc springs s The relational expression is:

[0021]

[0022]

[0023] Where k s Is the theoretical equivalent stiffness of the disc spring (kN / mm); k s ' Is the theoretical equivalent stiffness of the disc spring without considering friction (kN / mm); n is the number of stacks of the disc spring groups; f M Is the friction coefficient of the disc spring conical surface; N is the number of disc spring groups; i is the number of butt joints of the disc springs; f d Is the deformation of a single disc spring sheet (mm); F d Is the bearing capacity of a single disc spring (kN).

[0024] Optionally, anti-pulling connectors are provided on the lower connecting plate, and a support plate is provided on the middle connecting plate. The horizontal plane of the support plate is in sliding contact with the horizontal plane of the anti-pulling connectors.

[0025] Optionally, a guide rod base is provided on the middle connecting plate, and a plurality of guide rods are arranged in an array on the guide rod base. The guide rod bottom plate is provided with guide rod fixing parts and middle connecting plate fixing parts. A plurality of the guide rod fixing parts are uniformly distributed along the circumferential direction of the guide rod and are respectively used for connecting with the guide rod, and the middle connecting plate fixing part is arranged at the axis of the guide rod and is connected with the middle connecting plate.

[0026] Optionally, a guide rod counterbore for accommodating the guide rod fixing parts is provided on the lower surface of the guide rod bottom plate, and a connecting plate counterbore for accommodating the middle connecting plate fixing parts is provided on the upper surface of the guide rod bottom plate.

[0027] Optionally, the lateral vibration isolation assembly includes high-damping rubber isolation bearings, and the high-damping rubber isolation bearings are fixedly connected to the middle connecting plate and the lower connecting plate respectively.

[0028] In summary, the present invention includes at least one of the following beneficial technical effects: The present invention combines a vertical vibration isolation structure and a lateral vibration isolation structure to form a new type of three-dimensional composite isolation bearing, which has horizontal and vertical vibration isolation effects and can better meet the vibration isolation requirements under complex three-direction earthquake actions, and has a wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the front view of the embodiment of the present invention;

[0030] Figure 2 is the A-A cross-sectional view of the embodiment of the present invention;

[0031] Figure 3 is the B-B cross-sectional view of the embodiment of the present invention.

[0032] Description of the reference numerals: 1, upper connecting plate; 2, pressing block; 3, disc spring group; 4, guide rod; 5, viscoelastic damper; 6, guide rod bottom plate; 7, guide rod connecting bolt; 8, middle connecting plate; 9, guide rod bottom plate connecting bolt; 10, viscoelastic damper connecting bolt; 11, high-damping rubber isolation bearing; 12, anti-pulling connector; 13, lower connecting plate; 14, high-damping rubber bearing connecting bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following further describes the present invention in detail Figures 1 - 3 with reference to the attached drawings.

[0034] An embodiment of the present invention discloses a flexible anti-pulling three-dimensional composite isolation bearing.

[0035] Refer to Figure 1 、Figure 2 , Figure 3 , a flexible tensile-resistant three-dimensional composite isolation bearing, comprising an upper connecting plate 1, a middle connecting plate 8 and a lower connecting plate 13; the upper connecting plate 1 is used to connect a building, and a vertical vibration isolation component is arranged between the upper connecting plate 1 and the middle connecting plate 8. The vertical vibration isolation component includes a pressing block 2, a vertical elastic buffer and a guide rod 4 arranged on the middle connecting plate 8. The guide rod 4 has a track, and the pressing block 2 is slidably arranged along the vertical direction on the track. The vertical elastic buffer is used to apply an upward pre-tightening force to the pressing block 2. A lateral vibration isolation component for lateral vibration isolation is arranged between the lower connecting plate 13 and the middle connecting plate 8. The present invention combines a vertical vibration isolation structure and a lateral vibration isolation structure to form a new three-dimensional composite isolation bearing, which has horizontal and vertical vibration isolation effects, can better meet the isolation requirements under complex three-direction earthquake actions, and has a wider applicability.

[0036] The vertical vibration isolation component further includes a viscoelastic damper 5 arranged on the middle connecting plate 8, and the viscoelastic damper 5 is used to apply an upward damping force to the upper connecting plate 1. In this embodiment, four viscoelastic dampers 5 are arranged, and the four viscoelastic dampers 5 are arranged vertically between the upper connecting plate 1 and the middle connecting plate 8. The outer edges of the viscoelastic dampers 5 are aligned with the outer edges of the upper connecting plate 1 and the middle connecting plate 8, and are respectively connected to the upper connecting plate 1 and the middle connecting plate 8 through viscoelastic damper connecting bolts 10.

[0037] The vertical elastic buffer includes a plurality of disc spring groups 3 coaxially sleeved on the guide rod 4. The disc spring groups 3 are composed of a plurality of disc spring sheets being butted and superposed. The pressing block 2 is arranged on the top surface of the disc spring groups 3.

[0038] In this embodiment, seven disc spring groups 3 are arranged, and the seven disc spring groups 3 are respectively composed of a plurality of disc spring sheets being butted and superposed. The pressing block 2 is arranged on the top surface of the disc spring groups 3, and the pressing block 2 is used to conduct the upper pressure, and the pressing block 2 is welded to the upper connecting plate 1. A guide rod 4 is arranged inside the disc spring groups 3 to assist in bearing force, and the central axis of the guide rod 4 coincides with the central axis of the disc spring groups 3; the outer diameter of the chassis of the guide rod 4 is slightly larger than the outer diameter of the disc spring sheet, and the inner diameter is slightly smaller than the inner diameter of the disc spring sheet; a bolt hole is left at the center of the bottom of the guide rod 4 for connecting with the guide rod bottom plate 6.

[0039] The guide rod 4 has a chassis and a vertical rod fixedly arranged on the chassis. The chassis is arranged on the middle connecting plate 8, and the disc spring groups 3 are coaxially arranged on the vertical rod. The outer diameter of the chassis is slightly larger than the outer diameter of the disc spring sheet, and the inner diameter of the chassis is slightly smaller than the inner diameter of the disc spring sheet.

[0040] An anti-pulling connector 12 is arranged on the lower connecting plate 13, and a support plate is arranged on the middle connecting plate 8. The horizontal plane of the support plate is in sliding contact with the horizontal plane of the anti-pulling connector 12.

[0041] A guide rod base is provided on the middle connecting plate 8. A plurality of guide rods 4 are arranged in an array on the guide rod base. The guide rod bottom plate 6 is provided with guide rod fixing parts and middle connecting plate 8 fixing parts. A plurality of guide rod fixing parts are evenly distributed along the circumferential direction of the guide rod 4 and are respectively used for connecting with the guide rod 4. The middle connecting plate 8 fixing part is arranged at the axis center of the guide rod 4 and is connected with the middle connecting plate 8. The guide rod fixing part is a guide rod connecting bolt 7, and the middle connecting plate 8 fixing part is a connecting plate connecting bolt. In this embodiment, the guide rod bottom plate 6 is provided with seven bottom plate bolt holes for connecting with the guide rod. Six of the bottom plate bolt holes are evenly distributed at an included angle of 60° with the center point of the guide rod bottom plate 6 as the center of the circle, and one bottom plate bolt hole is located at the center point position of the guide rod bottom plate 6, and a counterbore is made on the lower surface of the guide rod bottom plate 6, and it is connected with the middle connecting plate 8 through a guide rod bottom plate connecting bolt 9; the guide rod bottom plate 6 is provided with four connecting plate bolt holes for connecting with the middle connecting plate 8, which are evenly distributed at the four corners of the guide rod bottom plate 6, and a counterbore is made on the upper surface of the guide rod bottom plate 6, and it is connected with the middle connecting plate 8 through a guide rod connecting bolt 7.

[0042] A guide rod counterbore for accommodating the guide rod fixing part is arranged on the lower surface of the guide rod bottom plate 6, and a connecting plate counterbore for accommodating the middle connecting plate 8 fixing part is arranged on the upper surface of the guide rod bottom plate 6.

[0043] The horizontal vibration isolation assembly includes a high-damping rubber isolation bearing 11, and the high-damping rubber isolation bearing 11 is fixedly connected with the middle connecting plate 8 and the lower connecting plate 13 respectively. The high-damping rubber isolation bearing 11 is connected with the middle connecting plate 8 and the lower connecting plate 13 by bolts. The bolt holes on the upper surface of the middle connecting plate 8 and the lower surface of the lower connecting plate 13 are made into counterbores to prevent the bolt heads from protruding and causing collisions in the connection.

[0044] When a horizontal earthquake occurs, due to the existence of the guide rod 4, the shear force is transmitted from the upper column of the building to the pressure block 2, then transmitted to the guide rod 4 through the pressure block 2, and then transmitted to the guide rod bottom plate 6 and the middle connecting plate 8 through the guide rod 4, and finally transmitted to the high-damping rubber isolation bearing 11, realizing the force decoupling in the vertical and horizontal directions of the three-dimensional isolation bearing. At this time, the horizontal vibration isolation structure composed of the high-damping rubber isolation bearing 11 plays a major vibration isolation role, and the addition of the vertical vibration isolation structure will not affect the original vibration isolation effect.

[0045] When a vertical earthquake occurs, due to the parallel combination of the conical spring group 3 and the viscoelastic damper 5, they jointly form a vertical seismic isolation structure. The conical spring group 3 has a high bearing capacity, and the butting and overlapping methods are flexible, which can ensure that the vertical stiffness of the vertical seismic isolation structure meets the design requirements; the viscoelastic damper 5 has strong damping characteristics, providing sufficient energy dissipation requirements for the vertical seismic isolation structure, and the friction between the conical spring sheets also provides a certain amount of energy dissipation. Therefore, under the compression state, they can cooperate to deform under the action of vertical earthquakes, consume vertical earthquake energy, protect the upper structure from damage, and achieve the effect of energy dissipation and seismic reduction.

[0046] In the tension state, the conical spring group 3 exits the working state. Due to the existence of the anti-pulling connector 12, the high-damping rubber bearing does not bear the tensile force, and the tensile force is borne by the viscoelastic damper 5. Due to the small vertical stiffness and high bearing capacity of the viscoelastic damper 5, the vertical upward degree of freedom of the bearing is released, avoiding the situation of excessive column bottom tensile force caused by rigid connection resulting in tensile failure of the rubber seismic isolation bearing, and significantly improving the effectiveness and service function of the seismic isolation bearing.

[0047] The present invention provides a design method for a flexible anti-pulling three-dimensional composite seismic isolation bearing based on any one of the above, including the following steps:

[0048] S1. Determine the size of the high-damping rubber bearing according to the bearing capacity requirement;

[0049] S2. Reasonably select the diameter D (mm) and the number of groups N of the conical spring sheets according to the spatial size of the high-damping rubber bearing;

[0050] S3. The relational expression between the bearing capacity and the number of overlaps n of the conical spring group:

[0051]

[0052] Where P is the vertical axial compressive load (kN) acting on the bearing, determined according to the design target; N is the number of conical spring groups; F d is the bearing capacity of a single conical spring (kN), which can be determined by referring to "Conical Springs" (GB / T 1972-2005) according to the diameter D (mm) of the conical spring.

[0053] S4. Design the number of butts i of the conical spring group according to the deformation requirement, and calculate the theoretical equivalent stiffness k s , specifically:

[0054]

[0055] Where k s is the theoretical equivalent stiffness of the conical spring (kN / mm); k s' is the theoretical equivalent stiffness of the conical spring without considering friction (kN / mm); n is the number of stacked conical springs; f M is the friction coefficient of the conical surface of the conical spring; N is the number of groups of conical springs; i is the number of pairs of conical springs; f d is the deformation of a single conical spring (mm); f M 、f d can be determined by referring to "Conical Springs" (GB / T 1972 - 2005) according to the diameter D (mm) of the conical spring.

[0056] S5. Design the area A (mm2) and thickness T r (mm) of the viscoelastic damper according to the anti - pull - out requirement.

[0057] S6. Calculate the theoretical equivalent stiffness K (kN / mm) of the flexible anti - pull - out three - dimensional composite isolation bearing, specifically:

[0058]

[0059] where k d is the theoretical equivalent stiffness of the damper (kN / mm); k s is the theoretical equivalent stiffness of the conical spring (kN / mm); G eq (γ) is the equivalent shear modulus (MPa), determined by tests; A is the area of the damper (mm2); T r is the thickness of the damper (mm).

[0060] In this embodiment, the size of the high - damping rubber isolation bearing 11 is HDB400, the diameter D of the conical spring group 3 is 140 mm, and the number of groups N = 7. The number of stacked conical springs of the conical spring 3 is calculated by the formula The upper vertical axial compression load P = 1114 kN, the number of conical spring groups N = 7, and the bearing capacity F of a single conical spring d = 85.3 kN. The minimum required number of stacked conical springs can be obtained as 1.87, and the number of stacked conical springs n = 2 is taken, f M Take 0.08.

[0061] In this embodiment, the number of pairs of conical springs i = 6 of the conical spring 3 is designed. According to the formula, the theoretical equivalent stiffness k of the conical spring is calculated s = 90.14 kN / mm. The equivalent shear modulus G eq (γ) of the viscoelastic damper 5 is designed to be 0.7, the area A = 60000 mm 2 , and the thickness T of the viscoelastic damper r = 10 mm. The theoretical equivalent stiffness k of the damper is calculated d= 33.6 kN / mm, the theoretical equivalent stiffness K of the flexible tensile three-dimensional composite isolation bearing is 123.74 kN / mm.

[0062] In this embodiment, to ensure that the tensile connector 12 and the support plate have sufficient flexural stiffness and do not produce excessive deformation, which may affect the normal performance of the isolation bearing, taking Q345 steel as an example, the thickness of the tensile connector 12 and the support plate should not be less than 20 mm. Compare the theoretical stiffness results and the measured stiffness results of the flexible tensile three-dimensional composite isolation bearing in the second embodiment. The second embodiment elaborates on the implementation manner through specific examples. In actual engineering, the bearing stiffness can be flexibly designed through different combinations of disc springs. The following is a theoretical calculation and measured comparison of the bearings with three different combinations of disc springs, as shown in the following table:

[0063]

[0064]

[0065] Compared with the traditional two-dimensional rubber isolation bearing, the present invention combines a vertical isolation structure composed of a disc spring group 3 and a viscoelastic damper 5 to form a new three-dimensional composite isolation bearing, which has horizontal and vertical isolation effects and can better meet the isolation requirements under complex three-directional seismic actions. Based on its energy dissipation and tensile resistance performance, it has a wider applicability in the isolation of large-span structures, buildings with a large height-width ratio or uneven plane layouts.

[0066] The addition of the vertical isolation structure improves the vertical energy dissipation capacity and vertical tensile resistance capacity of the isolation bearing, can consume the vertical seismic component, prevent the rubber bearing from being damaged by tension, protect the safety of the bearing, and largely avoid the overturning problem of the isolation bearing after an earthquake.

[0067] The vertical isolation structure of the present invention has flexible tensile properties, with a low vertical tensile stiffness and a large vertical tensile bearing capacity, allowing the bearing to produce vertical displacement. On the one hand, it can prevent the vertical displacement constraint caused by rigid connection. On the other hand, the force is clear during the seismic isolation and vibration reduction design process, which is conducive to analysis and calculation.

[0068] The disc spring group 3 in the vertical isolation structure can be flexibly designed according to different engineering conditions. And since the components are mainly connected by bolts, the installation and disassembly are very convenient, there is no complex mechanical structure, and it has good replaceability, which is beneficial to subsequent maintenance or replacement, and greatly improves the maintainability of the bearing.

[0069] All components of the present invention are connected by bolts, so it has the characteristics of easy replacement and convenient repair, and has a high utilization rate. Among them, all bolts are 8.8-grade high-strength bolts. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A three-dimensional composite seismic isolation bearing, characterized in that: It comprises an upper connecting plate, a middle connecting plate and a lower connecting plate; the upper connecting plate is used to connect the building, a vertical vibration isolation assembly is arranged between the upper connecting plate and the middle connecting plate, the vertical vibration isolation assembly comprises a pressure block, a vertical elastic buffer and a guide rod arranged on the middle connecting plate, the guide rod has a track, the pressure block is arranged on the track for sliding in the vertical direction, the vertical elastic buffer is used to apply an upward pre-tightening force to the pressure block, a lateral vibration isolation assembly for lateral vibration isolation is arranged between the lower connecting plate and the middle connecting plate, the anti-pull-out connector arranged on the lower connecting plate is in sliding contact with the support plate arranged on the middle connecting plate.

2. The three-dimensional composite seismic isolation seat assembly according to claim 1 is characterized in that: The vertical seismic isolation assembly also includes a viscoelastic damper arranged on the middle connecting plate, and the viscoelastic damper is used to apply an upward damping force to the upper connecting plate.

3. The three-dimensional composite seismic isolation seat assembly according to claim 1 is characterized in that: If each of the viscoelastic dampers is arranged between the upper connecting plate and the middle connecting plate at an angle of 90°, the outer edge of the viscoelastic damper is aligned with the outer edges of the upper connecting plate and the middle connecting plate.

4. The three-dimensional composite seismic isolation seat assembly according to claim 1 is characterized in that: The vertical elastic buffer comprises a plurality of disc spring groups coaxially sleeved on the guide rod, the disc spring group is composed of a plurality of disc spring sheets matched and overlapped, and the pressure block is arranged on the top surface of the disc spring group.

5. The three-dimensional composite seismic isolation seat assembly according to claim 4 is characterized in that: The guide rod has a chassis and a vertical rod fixed to the chassis, the chassis is arranged on the middle connecting plate, the disc spring group is coaxially arranged on the vertical rod, the outer diameter of the chassis is larger than the outer diameter of the disc spring sheet, and the inner diameter of the chassis is smaller than the inner diameter of the disc spring sheet.

6. The three-dimensional composite seismic isolation seat assembly according to claim 5 is characterized in that: The number of pairs i of the disc spring group and the theoretical equivalent stiffness k of the disc spring s The relationship is: where k s k is the theoretical equivalent stiffness of disc spring (kN / mm); s ' is the theoretical equivalent stiffness of the disc spring without considering friction (kN / mm); n is the number of disc spring stacks; f M is the friction coefficient of the disc spring cone surface; N is the number of disc spring groups; i is the number of disc spring pairs; f d is the deformation of the single disc spring (mm); F d is the bearing capacity of the single disc spring (kN).

7. The three-dimensional composite seismic isolation seat assembly according to claim 1 is characterized in that: The lower connecting plate is provided with an anti-pullout connector, and the middle connecting plate is provided with a support plate. The horizontal surface of the support plate is in sliding contact with the horizontal surface of the anti-pullout connector.

8. The three-dimensional composite seismic isolation seat assembly according to claim 1 is characterized in that: A guide rod base is provided on the middle connecting plate, and a plurality of guide rods are arranged in an array on the guide rod base. The guide rod bottom plate is provided with guide rod fixing parts and middle connecting plate fixing parts. There are a plurality of guide rod fixing parts evenly distributed along the circumference of the guide rod and respectively used to connect with the guide rods. The middle connecting plate fixing part is provided at the axis center of the guide rod and connected to the middle connecting plate.

9. The three-dimensional composite seismic isolation seat assembly according to claim 8 is characterized in that: The lower surface of the guide rod bottom plate is provided with a guide rod countersunk hole for accommodating the guide rod fixing piece, and the upper surface of the guide rod bottom plate is provided with a connecting plate countersunk hole for accommodating the middle connecting plate fixing piece.

10. The three-dimensional composite seismic isolation seat assembly according to claim 1 is characterized in that: The lateral vibration isolation assembly comprises a high-damping rubber vibration isolation support, and the high-damping rubber vibration isolation support is fixedly connected to the middle connecting plate and the lower connecting plate respectively.

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