A friction pendulum seismic isolation bearing with independent composite curvature in all directions

Abstract

This utility model discloses an anisotropic independent composite curvature friction pendulum seismic isolation bearing, relating to the field of bridge bearing technology. It includes an upper connecting plate, a lower connecting plate, and an intermediate support. The upper connecting plate is used to fix the bridge superstructure; the lower connecting plate is used to fix the bridge substructure, and both sides of the lower connecting plate in the transverse direction are provided with first limiting members; the intermediate support is disposed between the upper and lower connecting plates; the upper side of the intermediate support forms a friction pair with the lower side of the upper connecting plate, allowing the upper connecting plate to slide relative to the intermediate support; the lower side of the intermediate support forms a friction pair with the upper side of the lower connecting plate, allowing the lower connecting plate to slide relative to the intermediate support, and the two sides of the lower end of the intermediate support in the transverse direction can respectively abut against the first limiting members on both sides to restrict the relative sliding of the lower connecting plate and the intermediate support in the transverse direction. The anisotropic independent composite curvature friction pendulum seismic isolation bearing provided by this utility model is more adaptable to the vibration reduction requirements of bridges and provides more reasonable seismic isolation characteristics.

Description

Technical Field

[0001] This utility model relates to the field of bridge bearing technology, and in particular to an anisotropic independent composite curvature friction pendulum seismic isolation bearing. Background Technology

[0002] In recent years, frequent global earthquakes have caused significant losses to people's property and personal safety. As lifelines for disaster relief, damage to roads and bridges not only results in huge direct losses but also poses great difficulties for disaster relief efforts, leading to severe secondary disasters and environmental damage. Seismic isolation bearings can effectively reduce bridge damage. Therefore, seismic isolation designs and bearings are required for bridges in seismically active areas. The basic principle of bridge seismic isolation bearings is to separate the beam structure from the piers to the maximum extent possible, thereby reducing the transmission of seismic forces to the superstructure. Among them, the most widely used and effective is the friction pendulum seismic isolation bearing. It uses a friction pendulum design to extend the natural period of the structure, reducing seismic isolation while also dissipating seismic forces through frictional energy dissipation.

[0003] However, current seismic isolation bearings all adopt spherical structures, with equal stiffness, radius of curvature, and displacement in all directions. This design is completely different from bridge structures. Bridges have large spans and relatively small transverse lanes, resulting in significant deviations in their longitudinal (along the bridge length) and transverse (along the bridge width) seismic states. Using the same design parameters leads to wasted transverse displacement and insufficient longitudinal displacement. Even with the same stiffness, the bearings cannot perfectly perform their seismic isolation function, and the additional cost does not make them effective. Utility Model Content

[0004] The purpose of this invention is to provide an anisotropic independent composite curvature friction pendulum seismic isolation bearing to solve the problems existing in the prior art, better adapt to the seismic reduction requirements of bridges, and provide more reasonable seismic isolation characteristics.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides an anisotropic independent composite curvature friction pendulum seismic isolation bearing, including an upper connecting plate, a lower connecting plate, and an intermediate support; the upper connecting plate is used to fix and connect the superstructure of the bridge; the lower connecting plate is used to fix and connect the substructure of the bridge, and a first limiting member is provided on both sides of the lower connecting plate in the transverse direction of the bridge; the intermediate support is disposed between the upper connecting plate and the lower connecting plate; the upper side of the intermediate support and the lower side of the upper connecting plate form a friction pair, so that the upper connecting plate can slide relative to the intermediate support; the lower side of the intermediate support and the upper side of the lower connecting plate form a friction pair, so that the lower connecting plate can slide relative to the intermediate support, and the two sides of the lower end of the intermediate support in the transverse direction of the bridge can respectively abut against the first limiting members on both sides, so as to restrict the relative sliding of the lower connecting plate and the intermediate support in the transverse direction of the bridge.

[0007] Preferably, the upper side of the intermediate support and the lower side of the upper connecting plate form a spherical friction pair; the lower side of the intermediate support and the upper side of the lower connecting plate form a spherical friction pair or a cylindrical friction pair.

[0008] Preferably, the intermediate support includes an upper support plate and a lower support plate arranged sequentially from top to bottom; the upper side of the upper support plate forms a friction pair with the lower side of the upper connecting plate; the lower side of the upper support plate forms a friction pair with the upper side of the lower support plate that can rotate relative to each other, and can restrict the upper support plate and the lower support plate from sliding in the horizontal direction; the lower side of the lower support plate forms a friction pair with the upper side of the lower connecting plate.

[0009] Preferably, the upper support plate and the lower support plate are coaxially arranged, and the lower side surface of the upper support plate and the upper side surface of the lower support plate form a spherical friction pair; a second limiting member is coaxially arranged between the upper support plate and the lower support plate, the second limiting member is vertically arranged and extends into the upper support plate and the lower support plate, and the second limiting member is clearance-fitted with the upper support plate and / or the lower support plate.

[0010] Preferably, a sliding plate is provided at the friction pair between the upper side of the upper support plate and the lower side of the upper connecting plate, the friction pair between the lower side of the upper support plate and the upper side of the lower support plate, and the friction pair between the lower side of the lower support plate and the upper side of the lower connecting plate.

[0011] Preferably, it further includes a third limiting member, which is disposed on both sides of the upper end of the intermediate support in the transverse direction, and both sides of the upper end of the intermediate support in the transverse direction are connected to the two sides of the upper connecting plate in the transverse direction through the third limiting member;

[0012] When the force between the intermediate support and the upper connecting plate in the transverse direction exceeds the strength limit of the third limiting member, the third limiting member breaks to release the transverse restriction between the intermediate support and the upper connecting plate.

[0013] Preferably, it further includes a fourth limiting member, which is disposed on both sides of the upper and lower ends of the intermediate support along the bridge direction. Both sides of the upper end of the intermediate support along the bridge direction are connected to the two sides of the upper connecting plate along the bridge direction through the fourth limiting member, and both sides of the lower end of the intermediate support along the bridge direction are connected to the two sides of the lower connecting plate along the bridge direction through the fourth limiting member.

[0014] When the force along the longitudinal bridge direction between the intermediate support and the upper connecting plate and the lower connecting plate exceeds the strength limit of the fourth limiting member, the fourth limiting member breaks to release the longitudinal bridge direction restriction between the intermediate support and the upper connecting plate or the lower connecting plate.

[0015] Preferably, both the third limiting member and the fourth limiting member include a limiting rod and a shear bolt. One end of the limiting rod is fixedly connected to the intermediate support, and the other end is connected to the corresponding upper connecting plate or the lower connecting plate through the shear bolt. The shear bolt is capable of breaking under the action of a force exceeding its own strength limit.

[0016] Preferably, the circumferential edge of the lower side of the upper connecting plate and the two sides of the upper side of the lower connecting plate along the bridge direction are provided with limit protrusions.

[0017] Preferably, the upper connecting plate, the lower connecting plate, and the intermediate support are all made of steel, and the sliding plate is made of PTFE.

[0018] The present invention achieves the following technical advantages over the prior art:

[0019] The anisotropic independent composite curvature friction pendulum seismic isolation bearing provided by this utility model has upper and lower connecting plates that slide relative to the intermediate support through friction pairs. The longitudinal displacement requirement is large, so the combined displacement of the upper and lower connecting plates is used to meet the displacement demand. The transverse displacement is small; by setting first limiting members on both sides of the lower connecting plate in the transverse direction, the intermediate support abuts against the first limiting members in the transverse direction, restricting the relative sliding between the lower connecting plate and the intermediate support in the transverse direction. That is, the transverse displacement requirement relies solely on the upper connecting plate for displacement, reducing displacement waste. Thus, the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided by this utility model can meet different requirements for curvature radius, stiffness, and displacement in the longitudinal and transverse directions. The displacement is independently controlled in the longitudinal and transverse directions, better adapting to the vibration reduction needs of bridges and providing more reasonable seismic isolation characteristics. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the longitudinal structure of the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in Embodiment 1 of this utility model;

[0022] Figure 2 This is a schematic diagram of the transverse bridge structure of the anisotropic independent composite curvature friction pendulum seismic isolation support provided in Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of the longitudinal structure of the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in Embodiment 2 of this utility model;

[0024] Figure 4 This is a schematic diagram of the transverse bridge structure of the anisotropic independent composite curvature friction pendulum seismic isolation support provided in Embodiment 3 of this utility model;

[0025] Figure 5 This is a schematic diagram of the longitudinal structure of the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in Embodiment 4 of this utility model;

[0026] Figure 6 This is a schematic diagram of the longitudinal structure of the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in Embodiment 5 of this utility model.

[0027] In the diagram: 1-Upper connecting plate; 2-Lower connecting plate; 3-First limiting component; 4-Intermediate support; 41-Upper support plate; 42-Lower support plate; 43-Second limiting component; 5-Slide plate; 6-Third limiting component; 7-Fourth limiting component; 8-Limiting rod; 9-Shear bolt; 10-Limiting protrusion. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The purpose of this invention is to provide an anisotropic independent composite curvature friction pendulum seismic isolation bearing to solve the problems existing in the prior art, better adapt to the seismic reduction requirements of bridges, and provide more reasonable seismic isolation characteristics.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] This embodiment provides an anisotropic independent composite curvature friction pendulum seismic isolation bearing. Please refer to [link to relevant documentation]. Figure 1 and Figure 2 The system includes an upper connecting plate 1, a lower connecting plate 2, and an intermediate support 4. The upper connecting plate 1 is used to fix and connect the upper structure of the bridge. The lower connecting plate 2 is used to fix and connect the lower structure of the bridge, and both sides of the lower connecting plate 2 in the transverse direction are provided with first limiting members 3. The intermediate support 4 is located between the upper connecting plate 1 and the lower connecting plate 2. The upper side of the intermediate support 4 and the lower side of the upper connecting plate 1 form a friction pair, so that the upper connecting plate 1 can slide relative to the intermediate support 4. The lower side of the intermediate support 4 and the upper side of the lower connecting plate 2 form a friction pair, so that the lower connecting plate 2 can slide relative to the intermediate support 4. The two sides of the lower end of the intermediate support 4 in the transverse direction can respectively abut against the first limiting members 3 on both sides, so as to restrict the lower connecting plate 2 and the intermediate support 4 from sliding relative to each other in the transverse direction.

[0033] Both the upper connecting plate 1 and the lower connecting plate 2 slide relative to the intermediate support 4 through friction pairs. The longitudinal displacement requirement is large, so the combined displacement of the upper connecting plate 1 and the lower connecting plate 2 is set to meet the displacement requirement. The transverse displacement is small. By setting the first limiting member 3 on both sides of the lower connecting plate 2 in the transverse direction, the intermediate support 4 abuts against the first limiting member 3 in the transverse direction, which restricts the relative sliding of the lower connecting plate 2 and the intermediate support 4 in the transverse direction. That is, the transverse displacement requirement is achieved solely by the upper connecting plate 1, which can reduce displacement waste. Thus, the independent composite curvature friction pendulum seismic isolation bearing provided by this utility model can meet the requirements of different curvature radii, stiffness and displacement in the longitudinal and transverse directions, which is more suitable for the vibration reduction requirements of bridges and provides more reasonable vibration reduction and isolation characteristics.

[0034] The upper bridge superstructure connected by the upper connecting plate 1 and the lower bridge substructure connected by the lower connecting plate 2 are determined according to the specific application location of the independent composite curvature friction pendulum seismic isolation bearing.

[0035] In the optional schemes of this embodiment, more preferably, the upper side of the intermediate support 4 and the lower side of the upper connecting plate 1 form a spherical friction pair, and the lower side of the intermediate support 4 and the upper side of the lower connecting plate 2 form a spherical friction pair or a cylindrical friction pair.

[0036] The upper side of the intermediate support 4, the lower side of the upper connecting plate 1, the lower side of the intermediate support 4, and the upper side of the lower connecting plate 2 are all spherical, achieving frictional movement in all directions through a spherical friction pair. Alternatively, the upper sides of the intermediate support 4 and the lower connecting plate 2 can also be cylindrical, allowing for relative sliding in the transverse direction. The spherical surface of the upper side of the lower connecting plate 2 is truncated on both sides in the transverse direction, such as... Figure 2 As shown, the first limiting member 3 is set in the longitudinal direction of the bridge to achieve the limiting of the transverse direction of the bridge.

[0037] The first limiting member 3 may be provided with one or more steel limiting blocks distributed along the bridge direction, which can be fixed to the lower connecting plate 2 by welding; the limiting blocks abut against the intermediate support 4 to limit the transverse direction of the bridge.

[0038] In the optional embodiment, more preferably, the intermediate support 4 includes an upper support plate 41 and a lower support plate 42 arranged sequentially from top to bottom; the upper side of the upper support plate 41 forms a friction pair with the lower side of the upper connecting plate 1; the lower side of the upper support plate 41 forms a friction pair with the upper side of the lower support plate 42 that can rotate relative to each other, and can restrict the upper support plate 41 and the lower support plate 42 from sliding in the horizontal direction; the lower side of the lower support plate 42 forms a friction pair with the upper side of the lower connecting plate 2.

[0039] Specifically, by forming a friction pair that allows relative rotation between the lower side of the upper support plate 41 and the upper side of the lower support plate 42, and by restricting the sliding of the upper support plate 41 and the lower support plate 42 in the horizontal direction, the horizontal load can be transmitted between the upper connecting plate 1 and the lower connecting plate 2, while also meeting the relative deflection requirements of the upper connecting plate 1 and the lower connecting plate 2, that is, the upper connecting plate 1 and the lower connecting plate 2 undergo horizontal torsion around the vertical axis, thereby meeting the torsion requirements of the bridge.

[0040] In the optional scheme of this embodiment, more preferably, the upper support plate 41 and the lower support plate 42 are coaxially arranged, and the lower side surface of the upper support plate 41 and the upper side surface of the lower support plate 42 form a spherical friction pair. By controlling the depth of the spherical friction pair, that is, the degree of concavity and convexity of the spherical surface of the lower side surface of the upper support plate 41 and the upper side surface of the lower support plate 42, the height difference of the concave surface of the spherical surface is used to limit the sliding of the upper support plate 41 and the lower support plate 42 in the horizontal direction, so that the intermediate support 4 as a whole transmits the load in the horizontal direction.

[0041] In the optional scheme of this embodiment, it is more preferred that a sliding plate 5 is provided at the friction pair between the upper side of the upper support plate 41 and the lower side of the upper connecting plate 1, the friction pair between the lower side of the upper support plate 41 and the upper side of the lower support plate 42, and the friction pair between the lower side of the lower support plate 42 and the upper side of the lower connecting plate 2.

[0042] By setting slide plates 5 at each friction pair, the sliding friction can be reduced.

[0043] Furthermore, the skateboard 5 uses a PTFE skateboard, which is a polytetrafluoroethylene board, and has a good service life.

[0044] In the optional schemes of this embodiment, it is more preferred that the upper connecting plate 1, the lower connecting plate 2 and the intermediate support 4 are all made of steel to ensure service life.

[0045] Example 2

[0046] This embodiment provides an anisotropic independent composite curvature friction pendulum seismic isolation bearing. Please refer to [link to relevant documentation]. Figure 3 The difference between this and the isotropic independent composite curvature friction pendulum seismic isolation bearing provided in Example 1 is as follows:

[0047] A second limiting member 43 is coaxially arranged between the upper support plate 41 and the lower support plate 42. The second limiting member 43 is vertically arranged and extends into the upper support plate 41 and the lower support plate 42, and the second limiting member 43 is in clearance fit with the upper support plate 41 and / or the lower support plate 42.

[0048] The second limiting member 43 further ensures the integrity of the intermediate support 4 in the transmission of horizontal force, avoiding the failure of the support as a whole due to detachment caused by relying solely on the spherical fit to transmit horizontal force. The second limiting member 43 is set as a limiting bolt, which can be fixedly connected to the lower support plate 42 and clearance-fitted with the upper support plate 41, without affecting the relative rotation between the upper support plate 41 and the lower support plate 42; or clearance-fitted with the lower support plate 42 and fixedly connected to the upper support plate 41; or clearance-fitted with both the upper support plate 41 and the lower support plate 42.

[0049] The other structures of the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0050] Example 3

[0051] This embodiment provides an anisotropic independent composite curvature friction pendulum seismic isolation bearing. Please refer to [link to relevant documentation]. Figure 4 The difference between this and the isotropic independent composite curvature friction pendulum seismic isolation bearing provided in Example 1 is as follows:

[0052] The anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in this embodiment also includes a third limiting member 6. The third limiting member 6 is disposed on both sides of the upper end of the intermediate support 4 in the transverse direction. Both sides of the upper end of the intermediate support 4 in the transverse direction are connected to the two sides of the upper connecting plate 1 in the transverse direction through the third limiting member 6. When the force between the intermediate support 4 and the upper connecting plate 1 in the transverse direction exceeds the strength limit of the third limiting member 6, the third limiting member 6 will break to release the restriction between the intermediate support 4 and the upper connecting plate 1 in the transverse direction.

[0053] By setting the third limiting member 6, the displacement of the independent composite curvature friction pendulum seismic isolation bearing in the transverse direction of the bridge can be restricted. At this time, the independent composite curvature friction pendulum seismic isolation bearing can only provide displacement in the longitudinal direction of the bridge. Moreover, if the transverse force of the bridge reaches a certain level, the third limiting member 6 will break to release the transverse restriction between the intermediate support 4 and the upper connecting plate 1, so that the independent composite curvature friction pendulum seismic isolation bearing can provide displacement in the transverse direction of the bridge.

[0054] The third limiting component 6 includes a limiting rod 8 and a shear bolt 9. The limiting rod 8 can be made of stainless steel, and the material and size of the shear bolt 9 can be determined according to the required strength. One end of the limiting rod 8 is fixedly connected to the intermediate support 4, such as by welding, and the other end is connected to the corresponding upper connecting plate 1 through the shear bolt 9. The shear bolt 9 can break under the action of a force exceeding its own strength limit, so as to release the limiting of the intermediate support 4 and the upper connecting plate 1 in the transverse direction of the bridge, so that the independent composite curvature friction pendulum seismic isolation bearings in each direction can provide displacement requirements in the transverse direction of the bridge.

[0055] The number of limit rods 8 is determined according to actual needs, as long as the required limit needs are met.

[0056] The other structures of the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0057] Example 4

[0058] This embodiment provides an anisotropic independent composite curvature friction pendulum seismic isolation bearing. Please refer to [link to relevant documentation]. Figure 5 The difference between this and the isotropic independent composite curvature friction pendulum seismic isolation bearing provided in Example 3 is as follows:

[0059] The anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in this embodiment also includes a fourth limiting member 7. The fourth limiting member 7 is disposed on both sides of the upper and lower ends of the intermediate support 4 along the bridge direction. Both sides of the upper end of the intermediate support 4 along the bridge direction are connected to the two sides of the upper connecting plate 1 along the bridge direction through the fourth limiting member 7. Both sides of the lower end of the intermediate support 4 along the bridge direction are connected to the two sides of the lower connecting plate 2 along the bridge direction through the fourth limiting member 7. When the force along the bridge direction between the intermediate support 4 and the upper connecting plate 1 and the lower connecting plate 2 exceeds the strength limit of the fourth limiting member 7, the fourth limiting member 7 will break to release the limitation along the bridge direction between the intermediate support 4 and the upper connecting plate 1 or the lower connecting plate 2.

[0060] By further setting a fourth limiting member 7, the displacement of the independent composite curvature friction pendulum seismic isolation bearing in the longitudinal direction of the bridge can be further restricted. At this time, the independent composite curvature friction pendulum seismic isolation bearing acts as a fixed bearing. When the longitudinal force of the bridge reaches a certain level, the fourth limiting member 7 breaks to release the longitudinal restriction between the intermediate support 4 and the upper connecting plate 1 and the lower connecting plate 2, so that the independent composite curvature friction pendulum seismic isolation bearing can provide the displacement requirement in the longitudinal direction of the bridge.

[0061] The fourth limiting component 7 includes a limiting rod 8 and a shear bolt 9. One end of the limiting rod 8 is fixedly connected to the intermediate support 4, and the other end is connected to the corresponding upper connecting plate 1 or lower connecting plate 2 through the shear bolt 9. The shear bolt 9 can break under the action of a force exceeding its own strength limit, so as to release the limitation between the intermediate support 4 and the upper connecting plate 1 or lower connecting plate 2 along the longitudinal direction of the bridge, so that the independent composite curvature friction pendulum seismic isolation bearings in each direction can provide displacement requirements in the longitudinal direction of the bridge.

[0062] The other structures of the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in this embodiment are the same as those in Embodiment 3, and will not be described in detail here.

[0063] Example 5

[0064] This embodiment provides an anisotropic independent composite curvature friction pendulum seismic isolation bearing. Please refer to [link to relevant documentation]. Figure 6 The difference between this and the isotropic independent composite curvature friction pendulum seismic isolation bearing provided in Example 1 is as follows:

[0065] Limiting protrusions 10 are provided on the circumferential edge of the lower side of the upper connecting plate 1 and on both sides of the upper side of the lower connecting plate 2 along the bridge direction.

[0066] Among them, by setting a limiting protrusion 10 at the edge, a limiting function is performed to prevent the beam from falling off due to excessive displacement.

[0067] Furthermore, the limiting protrusion 10 structure involved in the anisotropic independent composite curvature friction pendulum seismic isolation bearing provided in this embodiment can be flexibly combined with the anisotropic independent composite curvature friction pendulum seismic isolation bearings provided in embodiments two to four according to requirements. The limiting protrusion 10 can be intermittently set in the circumferential direction to avoid structural interference.

[0068] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An isotropic independent composite curvature friction pendulum seismic isolation bearing, characterized in that: include: Upper connecting plate (1) is used to fix and connect the upper structure of the bridge; The lower connecting plate (2) is used to fix and connect the lower structure of the bridge, and the lower connecting plate (2) is provided with first limiting members (3) on both sides in the transverse direction of the bridge; and An intermediate support (4) is disposed between the upper connecting plate (1) and the lower connecting plate (2); the upper side of the intermediate support (4) forms a friction pair with the lower side of the upper connecting plate (1) so that the upper connecting plate (1) can slide relative to the intermediate support (4); the lower side of the intermediate support (4) forms a friction pair with the upper side of the lower connecting plate (2) so that the lower connecting plate (2) can slide relative to the intermediate support (4), and the two sides of the lower end of the intermediate support (4) in the transverse direction can respectively abut against the first limiting member (3) on both sides so as to restrict the lower connecting plate (2) and the intermediate support (4) from sliding relative to each other in the transverse direction.

2. The isotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 1, characterized in that: The upper side of the intermediate support (4) and the lower side of the upper connecting plate (1) form a spherical friction pair; the lower side of the intermediate support (4) and the upper side of the lower connecting plate (2) form a spherical friction pair or a cylindrical friction pair.

3. The isotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 2, characterized in that: The intermediate support (4) includes an upper support plate (41) and a lower support plate (42) arranged sequentially from top to bottom; the upper side of the upper support plate (41) forms a friction pair with the lower side of the upper connecting plate (1); the lower side of the upper support plate (41) and the upper side of the lower support plate (42) form a friction pair that can rotate relative to each other, and can restrict the upper support plate (41) and the lower support plate (42) from sliding in the horizontal direction; the lower side of the lower support plate (42) and the upper side of the lower connecting plate (2) form a friction pair.

4. The anisotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 3, characterized in that: The upper support plate (41) and the lower support plate (42) are coaxially arranged, and the lower side of the upper support plate (41) and the upper side of the lower support plate (42) form a spherical friction pair; a second limiting member (43) is coaxially arranged between the upper support plate (41) and the lower support plate (42), the second limiting member (43) is vertically arranged and extends into the upper support plate (41) and the lower support plate (42), and the second limiting member (43) is clearance-fitted with the upper support plate (41) and / or the lower support plate (42).

5. The anisotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 3, characterized in that: Slide plates (5) are provided at the friction pairs between the upper side of the upper support plate (41) and the lower side of the upper connecting plate (1), the friction pairs between the lower side of the upper support plate (41) and the upper side of the lower support plate (42), and the friction pairs between the lower side of the lower support plate (42) and the upper side of the lower connecting plate (2).

6. The isotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 1, characterized in that: It also includes a third limiting member (6), which is disposed on both sides of the upper end of the intermediate support (4) in the transverse direction. Both sides of the upper end of the intermediate support (4) in the transverse direction are connected to the two sides of the upper connecting plate (1) in the transverse direction through the third limiting member (6). When the force between the intermediate support (4) and the upper connecting plate (1) in the transverse direction exceeds the strength limit of the third limiting member (6), the third limiting member (6) breaks so as to release the transverse restriction between the intermediate support (4) and the upper connecting plate (1).

7. The isotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 6, characterized in that: It also includes a fourth limiting member (7), which is disposed on both sides of the upper and lower ends of the intermediate support (4) along the bridge direction. Both sides of the upper end of the intermediate support (4) along the bridge direction are connected to the two sides of the upper connecting plate (1) along the bridge direction through the fourth limiting member (7). Both sides of the lower end of the intermediate support (4) along the bridge direction are connected to the two sides of the lower connecting plate (2) along the bridge direction through the fourth limiting member (7). When the force between the intermediate support (4) and the upper connecting plate (1) and the lower connecting plate (2) along the longitudinal bridge direction exceeds the strength limit of the fourth limiting member (7), the fourth limiting member (7) will break so as to release the longitudinal bridge direction restriction between the intermediate support (4) and the upper connecting plate (1) or the lower connecting plate (2).

8. The anisotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 7, characterized in that: Both the third limiting member (6) and the fourth limiting member (7) include a limiting rod (8) and a shear bolt (9). One end of the limiting rod (8) is fixedly connected to the intermediate support (4), and the other end is connected to the corresponding upper connecting plate (1) or lower connecting plate (2) through the shear bolt (9). The shear bolt (9) can break under the action of a force exceeding its own strength limit.

9. The isotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 1, characterized in that: Limiting protrusions (10) are provided on the circumferential edge of the lower side of the upper connecting plate (1) and on both sides of the upper side of the lower connecting plate (2) in the bridge direction.

10. The anisotropic independent composite curvature friction pendulum seismic isolation bearing according to claim 5, characterized in that: The upper connecting plate (1), the lower connecting plate (2) and the intermediate support (4) are all made of steel, and the sliding plate (5) is made of PTFE.

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