Friction damping support with multiple sliding surfaces

Abstract

The invention discloses a friction shock absorption support with multiple sliding surfaces, and belongs to the field of bridge shock absorption and isolation supports. The lower surface of the upper support plate is a convex face with the curvature radius of R1, and the upper sliding plate is tightly attached and fixed to the lower surface of the upper support plate. The upper surface of the lining plate is provided with a curved concave surface with the curvature radius of R1, the lower surface of the lining plate is provided with a curved protrusion with the curvature radius of R2, and the side face of the lining plate is an inclined face. The upper wear-resisting plate, the lower wear-resisting plate and the inclined wear-resisting plate are tightly attached and fixed to the upper surface, the lower surface and the side face of the lining plate respectively. And a concave surface is arranged on the upper surface of the lower support plate and comprises a lower support edge inclined surface and a lower support middle curved surface with the curvature radius of R2. And the lower sliding plate is tightly attached and fixed in the concave surface of the upper surface of the lower support plate. Curved surface sliding friction pairs are respectively formed between the upper wear-resisting plate and the upper sliding plate, between the middle curved surface of the lower sliding plate and the lower wear-resisting plate and between the edge inclined surface of the lower sliding plate and the inclined wear-resisting plate, and earthquake energy dissipation and buffering limiting are realized through the arrangement of multiple sliding surfaces.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge shock-absorbing and isolating bearings, and in particular relates to a friction shock-absorbing bearing with multiple sliding surfaces. Background Art

[0002] The seismic isolation bearing of a bridge is a device used to reduce the impact of earthquakes on bridge structures. Its main purpose is to dissipate seismic energy when an earthquake occurs, reduce the displacement and damage of the bridge structure, and thus improve the seismic performance of the bridge. Earthquake disasters have shown that the seismic velocity pulse effect of near-field earthquakes can cause large seismic displacements in seismic isolation bridges, leading to the destruction of seismic isolation devices and damage to bridges. Balancing energy consumption requirements and controlling seismic displacements are key issues that need to be addressed in the seismic isolation design of bridges under near-field earthquakes.

[0003] Friction pendulum bearings are a common seismic isolation device. Due to their high vertical bearing capacity, good energy dissipation and self-reset capabilities, they are widely used in the seismic isolation design of highway, railway and urban rail transit bridges. However, the friction pendulum bearing uses a sliding surface with a single curvature, which cannot simultaneously keep the normal use function and the self-reset function in an optimal state. When the curvature radius of the sliding surface is relatively small, the temperature deformation of the bridge is limited, and at the same time, there will be obvious vertical lifting of the beam during the sliding process; when the curvature radius is set too large, the self-reset ability of the bearing will be weakened, and the bridge will have residual deformation after the earthquake, affecting the use and safety of the bridge. On the other hand, the friction pendulum bearing does not have a limit function with a buffering effect, and may generate huge impact force due to the large bridge seismic displacement under the action of near-field vibration.

[0004] In order to solve the above-mentioned defects of the traditional friction pendulum bearing, it is urgent to develop a friction shock-absorbing bearing with multiple sliding surfaces. Summary of the invention

[0005] The present invention aims to solve the problem that a conventional friction pendulum bearing with a single curvature cannot adapt to both temperature conditions and strong earthquake conditions, and provides a friction damping bearing with multiple sliding surfaces. The friction damping bearing is suitable for the vibration reduction, energy consumption and buffering and limiting needs of bridges under near-fault earthquakes, and does not affect the free deformation requirements of bridges under temperature conditions.

[0006] The specific technical solutions adopted by the present invention are as follows:

[0007] The present invention provides a friction damping bearing with multiple sliding surfaces, comprising an upper bearing plate, an upper sliding plate, an upper wear-resistant plate, a lining plate, an inclined wear-resistant plate, a lower wear-resistant plate, a lower sliding plate and a lower bearing plate;

[0008] The upper support plate is divided into an upper flat plate portion and a lower raised portion, wherein the cross-sectional area of ​​the flat plate portion is larger than the cross-sectional area of ​​the raised portion; the upper sliding plate is fixed to the lower surface of the raised portion of the upper support plate and fits tightly;

[0009] The lining plate is a bowl-shaped structure, the upper surface of the lining plate is a curved concave surface, the lower surface is a curved surface of the lining plate convex part, and the side surface is an inclined surface of the lining plate side surface; wherein the cross-sectional area of ​​the curved concave surface part is larger than the cross-sectional area of ​​the curved surface of the lining plate convex part; the curvature of the curved concave surface part of the lining plate upper surface is equal to the curvature of the lower surface of the convex part of the upper support plate, and the radius of curvature is recorded as R1; the upper wear-resistant plate is tightly fitted and fixed on the upper surface of the lining plate, and a first curved sliding friction pair is formed between the upper wear-resistant plate and the upper sliding plate; a limit stop ring is provided on the periphery of the upper surface of the lining plate, and a horizontal gap exists between the limit stop ring and the periphery of the convex part of the upper support plate, and the limit stop ring limits the convex part of the upper support plate during the sliding process; the inclined wear-resistant plate is tightly fitted and fixed on the inclined surface of the lining plate side surface of the lining plate; the lower wear-resistant plate is tightly fitted and fixed on the curved surface of the convex part of the lining plate;

[0010] The upper surface of the lower support plate is provided with a concave surface, which is divided into an edge inclined surface of the lower support and an intermediate curved surface of the lower support, wherein the curvature of the intermediate curved surface of the lower support and the curved surface of the raised part of the lining plate are equal, and the radius of curvature is recorded as R2; the inclination angle of the edge inclined surface of the lower support is equal to the inclination angle of the side inclined surface of the lining plate, and the inclination angle is recorded as α; the area of ​​the intermediate curved surface of the lower support is larger than the area of ​​the curved surface of the raised part of the lining plate, and there is a relative sliding space between the two; the lower sliding plate is fixed on the concave surface of the upper surface of the lower support plate and fits tightly, including the intermediate curved surface of the lower sliding plate and the edge inclined surface of the lower sliding plate; the lower wear-resistant plate and the intermediate curved surface of the lower sliding plate constitute a second curved surface sliding friction pair; the inclined wear-resistant plate and the edge inclined surface of the lower sliding plate constitute a third inclined surface sliding friction pair.

[0011] Preferably, the curvature radius R1 of the upper surface of the concave part of the lining plate and the lower surface of the convex part of the upper support plate is selected to be 10000mm~20000mm; the curvature radius R2 of the middle curved surface of the lower support and the curved surface of the convex part of the lining plate is selected to be R1 / 4~R1 / 2; the inclination angle α of the edge slope of the lower support and the side slope of the lining plate is selected to be 40°~50°.

[0012] Preferably, the flat plate portion of the upper bearing plate is fixedly connected to the bottom of the bridge main beam by fasteners; and the lower surface of the lower bearing plate is fixedly connected to the top of the pier by fasteners.

[0013] Furthermore, the fastener is an anchor bolt.

[0014] Preferably, the upper sliding plate and the lower sliding plate are both made of austenitic stainless steel plates; the austenitic stainless steel plates are made of 06Cr17Ni12Mo2, 06Cr19Ni13Mo3 or 06Cr18Ni11Ti steel.

[0015] Preferably, the upper wear-resistant plate, the oblique wear-resistant plate and the lower wear-resistant plate are all made of polytetrafluoroethylene, modified polytetrafluoroethylene or modified ultra-high molecular weight polyethylene.

[0016] Preferably, the upper sliding plate is fixed to the lower surface of the raised portion of the upper support plate by welding; and the lower sliding plate is fixed to the concave surface of the lower support plate by welding.

[0017] Preferably, the upper support plate, lining plate and lower support plate are all made of Q355 steel.

[0018] Preferably, the upper wear-resistant plate and the lower wear-resistant plate are respectively bonded to the upper surface and the lower surface of the liner by adhesive.

[0019] Preferably, an oil storage tank for storing lubricant is provided on the surface of the curved surface portion between the upper sliding plate and the lower sliding plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The friction shock-absorbing bearing of the present invention is provided with multiple sliding surfaces. When the bridge is in normal use, the energy is dissipated by the first curved sliding friction pair, and the vertical lifting of the beam body is slight. In the earthquake working condition of the bridge, because the curvature radius of the first curved surface is large and the sliding distance is small, after the raised part below the upper bearing plate contacts the outer retaining ring on the upper surface of the lining plate, the second curved sliding friction pair composed of the central curved surface of the lower sliding plate and the lower wear-resistant plate participates in the work, and the seismic energy is further dissipated by the conversion of the kinetic energy and potential energy of the beam body and the sliding friction during the sliding process of the second curved surface. When the relative seismic displacement between the beam body and the bridge pier is large, the third inclined sliding friction pair composed of the edge inclined surface of the lower sliding plate and the inclined wear-resistant plate plays the role of energy dissipation and buffering. The seismic isolation bearing has clear division of labor in graded energy dissipation, simple structure, convenient installation, good durability, long service life, and good economy and practicality.

[0022] 2. The friction shock-absorbing bearing of the present invention can effectively control the displacement of the bridge under the action of earthquake. During the sliding process, the conversion of kinetic energy and potential energy when the structure is lifted and the friction energy consumption are utilized to reduce the horizontal seismic response of the bridge. At the same time, the edge slope of the lower bearing plate can effectively limit the relative displacement of the upper and lower structures to achieve the purpose of limiting.

[0023] 3. In the friction damping support of the present invention, the lower surface of the upper support plate and the upper surface of the lining plate, the lower surface of the lining plate and the upper surface of the lower support plate are curved surfaces and inclined surfaces, and can rely on the self-gravity of the upper structure as a restoring force to return to the equilibrium position. The friction damping support has self-reset capability.

[0024] 4. The friction damping bearing of the present invention has multiple sliding surfaces, so it has no inherent period and will not resonate with any type of excitation. Avoiding resonance can ensure the safety, durability and comfort of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic cross-sectional view of the structure of the friction damping support provided in this embodiment;

[0026] Figure 2 A schematic diagram of disassembling the friction damping support provided in this embodiment;

[0027] Figure 3 It is a schematic diagram of the combination of the side inclined surface of the liner and the convex part curved surface of the lower surface in this embodiment;

[0028] Figure 4 Schematic diagram of the combination of the edge slope and the middle curved surface of the lower support plate in this embodiment;

[0029] Figure 5 A schematic diagram of the working state of the friction damping support provided in this embodiment during a severe earthquake;

[0030] In the figure: upper support plate 1; upper sliding plate 2; upper wear-resistant plate 3; lining plate 4; lining plate side inclined surface 4-1; lining plate raised part curved surface 4-2; inclined wear-resistant plate 5; lower wear-resistant plate 6; lower sliding plate 7; lower support plate 8; lower support edge inclined surface 8-1; lower support middle curved surface 8-2; fastener 9. DETAILED DESCRIPTION

[0031] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0032] like Figure 1 As shown, as a preferred embodiment of the present invention, this embodiment provides a friction damping bearing with multiple sliding surfaces, including an upper bearing plate 1, an upper sliding plate 2, an upper wear-resistant plate 3, a lining plate 4, an inclined wear-resistant plate 5, a lower wear-resistant plate 6, a lower sliding plate 7 and a lower bearing plate 8. Since the friction damping bearing is mainly used in bridge seismic isolation technology, the upper surface of the upper bearing plate 1 is fixedly connected to the bottom of the bridge main beam through a fastener 9, and the lower surface of the lower bearing plate 8 is fixedly connected to the top of the bridge pier through a fastener 9.

[0033] like Figure 2As shown, in the device provided by the present invention, the upper support plate 1 is divided into an upper flat plate portion and a lower raised portion, wherein the cross-sectional area of ​​the flat plate portion is larger than the cross-sectional area of ​​the raised portion. In this embodiment, the fastener 9 is an anchor bolt. Specifically, holes for passing the anchor bolts are provided around the flat plate portion, and the upper support plate 1 is fixedly connected to the bottom of the bridge main beam through the anchor bolts.

[0034] In this embodiment, the upper sliding plate 2 is made of a mirror-finished austenitic stainless steel plate. The upper sliding plate 2 is fixed to the lower surface of the raised portion of the upper support plate 1 by welding and fits tightly, so the curvature of the upper sliding plate 2 is equal to the curvature of the lower surface of the raised portion of the upper support plate 1.

[0035] In the device provided by the present invention, the lining plate 4 is a bowl-shaped structure, the upper surface of the lining plate 4 is a curved concave surface, the lower surface is a curved surface 4-2 of the raised portion of the lining plate, and the side surface is an inclined surface 4-1 of the side surface of the lining plate. The cross-sectional area of ​​the curved concave portion is greater than the cross-sectional area of ​​the curved surface 4-2 of the raised portion of the lining plate. The curvature of the curved surface of the concave portion of the upper surface of the lining plate 4 is equal to the curvature of the lower surface of the raised portion of the upper support plate 1, and the radius of curvature is recorded as R1. The upper wear-resistant plate 3 is fixed to the upper surface of the curved concave portion of the lining plate 4 by adhesive bonding, and is tightly fitted to the upper surface of the lining plate 4, and a first curved sliding friction pair is formed between the upper wear-resistant plate 3 and the upper sliding plate 2. Figure 1 As shown, a limit stop ring is provided on the periphery of the upper surface of the lining plate 4, and a horizontal gap exists between the limit stop ring and the periphery of the raised portion of the upper support plate 1. The limit stop ring limits the raised portion of the upper support plate 1 during the sliding process.

[0036] Since both the upper wear-resistant plate 3 and the upper sliding plate 2 have a certain curvature, in order to avoid excessive displacement of the upper support plate 1 in the vertical direction during the sliding process of the upper support plate 1 on the upper surface of the lining plate 4, it is necessary to control the curvature radius of the first curved sliding friction pair as large as possible. In this embodiment, the curvature radius of R1 is selected to be 15000mm. Under normal use of the bridge structure, small deformations caused by temperature, shrinkage, creep, vehicle load, etc. are frictionally consumed through the first curved sliding friction pair. The first curved sliding friction pair adopts a small curvature surface, which makes the constraint stiffness of the bridge in the horizontal direction small, and the vertical lifting of the beam body can be controlled within a very small range.

[0037] like Figure 3As shown, the liner 4 is also provided with a liner side inclined surface 4-1 and a liner raised portion curved surface 4-2, wherein the curvature radius of the liner raised portion curved surface 4-2 is recorded as R2. The curvature radius R2 of the liner raised portion curved surface 4-2 is smaller than the curvature radius R1 of the lower surface of the raised portion of the upper support plate 1. The inclined wear-resistant plate 5 is fixed to the liner side inclined surface 4-1 by adhesive bonding, and fits tightly to the liner side inclined surface 4-1. The lower wear-resistant plate 6 is fixed to the liner raised portion curved surface 4-2 by adhesive bonding, and fits tightly to the liner raised portion curved surface 4-2, so the curvature of the lower wear-resistant plate 6 is equal to the curvature of the liner raised portion curved surface 4-2.

[0038] like Figure 4 As shown, the upper surface of the lower support plate 8 is provided with a concave surface, which is divided into a lower support edge inclined surface 8-1 and a lower support middle curved surface 8-2. The lower surface of the lower support plate 8 is provided with a plurality of holes for passing anchor bolts, and the lower support plate 8 is fixedly connected to the top of the pier through the anchor bolts.

[0039] In this embodiment, the lower sliding plate 7 is made of a mirror-finished austenitic stainless steel plate. The lower sliding plate 7 is fixed to the concave surface of the upper surface of the lower support plate 8 by welding, and the two are tightly fitted. The curvature of the middle curved surface 8-2 of the lower support is equal to the curvature of the curved surface 4-2 of the convex part of the lining plate, and the curvature radius of the middle curved surface 8-2 of the lower support is also recorded as R2. The inclination angle of the lower support edge inclined surface 8-1 is equal to the inclination angle of the side inclined surface 4-1 of the lining plate, and the inclination angle is recorded as α. The area of ​​the middle curved surface 8-2 of the lower support is larger than the area of ​​the middle curved surface 4-2 of the lining plate, and there is a relative sliding space between the two.

[0040] The middle curved surface of the lower wear plate 6 and the lower sliding plate 7 constitutes a second curved sliding friction pair, and the inclined wear plate 5 and the edge inclined surface of the lower sliding plate 7 constitute a third inclined sliding friction pair. The surface of the middle curved surface of the upper sliding plate 2 and the lower sliding plate 7 is provided with an oil storage tank for storing lubricant, and the friction coefficient is adjusted by the lubricant.

[0041] The support should be equipped with a reliable dustproof device. The dustproof device should be easy to remove so that the working status of the support can be checked at any time.

[0042] In this embodiment, the curvature radius R2 of the middle curved surface 8-2 of the lower support and the curved surface 4-2 of the lining plate protrusion is selected to be 7500 mm, and the inclination angle of the side inclined surface 4-1 of the lining plate and the edge inclined surface 8-1 of the lower support is selected to be 50°. Of course, those skilled in the art can select different curvature radii, different inclination angles and different friction coefficients according to the seismic design requirements of the bridge.

[0043] When the earthquake displacement has not exceeded the design displacement, the upper bearing plate 1 is displaced, and the edge of the raised part below the upper bearing plate 1 contacts the limit retaining ring around the lining plate 4. The displacement of the upper bearing plate 1 drives the lining plate 4 to displace as a whole, causing sliding friction between the lower wear-resistant plate 6 on the lower surface of the lining plate 4 and the lower sliding plate 7 on the upper surface of the lower bearing plate 8. The earthquake energy is further dissipated through the sliding friction between the middle curved surfaces of the lower wear-resistant plate 6 and the lower sliding plate 7 and the conversion of kinetic energy and potential energy during the lifting process of the beam body, while increasing the horizontal stiffness and deformation recovery force of the bridge.

[0044] like Figure 5 As shown, further, when the earthquake displacement exceeds the design displacement, the side slope 4-1 of the liner and the edge slope 8-1 of the lower support are in contact. During the sliding process, the edge slope of the lower support plate 8 can effectively limit the relative displacement of the upper and lower structures to achieve the purpose of limiting.

[0045] The present invention is based on the traditional sliding friction bearing, and realizes the seismic purpose of graded energy consumption and limitation according to earthquake displacement requirements through a multi-sliding surface arrangement of a small curvature curved sliding surface between the upper bearing plate and the upper surface of the lining plate, a curved sliding surface of the middle curved surface of the lower bearing plate and the raised part of the lining plate, an inclined sliding surface of the edge of the lower bearing plate and an inclined sliding surface of the side of the lining plate, and limiting measures of the lower bearing plate, so as to ensure the seismic function of the bridge after the earthquake.

[0046] It should be noted that in the present invention, the upper sliding plate 2 and the lower sliding plate 7 are both made of austenitic stainless steel plates, and the austenitic stainless steel plates can be selected from 06Cr17Ni12Mo2, 06Cr19Ni13Mo3 or 06Cr18Ni11Ti steel. The upper wear-resistant plate 3, the oblique wear-resistant plate 5 and the lower wear-resistant plate 6 are all made of polytetrafluoroethylene, modified polytetrafluoroethylene or modified ultra-high molecular weight polyethylene. The upper support plate 1, the lining plate 4 and the lower support plate 8 are all made of Q355 steel.

[0047] In addition, this embodiment also provides a method for applying the above-mentioned friction damping bearing in a bridge. The specific design steps are as follows, but here only a concrete bridge under construction is taken as an example. Appropriate adjustments need to be made for other types of bridges in different working conditions:

[0048] Step 1: Friction shock-absorbing bearing parameter design. According to the seismic capacity requirements of the bridge and the installation space of the friction shock-absorbing bearing, determine the required friction shock-absorbing bearing parameters, including the size and fixing requirements of the upper bearing plate 1 and the lower bearing plate 8, the friction coefficient of the upper wear-resistant plate 3, the inclined wear-resistant plate 5 and the lower wear-resistant plate 6, the structural size and installation requirements of the lining plate 4, the maximum allowable relative displacement, etc.

[0049] Step 2: According to the bridge seismic isolation bearing design documents, when pouring non-shrinkage cement mortar, reserve installation holes in the steel mold of the pier or main beam. The setting of the reserved holes needs to properly consider the position deviation caused by construction errors to ensure that the anchor bolts of the bridge friction shock-absorbing bearing have a certain degree of freedom when installing them later.

[0050] Step 3: Factory production and assembly of friction damping bearings. According to the friction damping bearing parameters determined in step 1, the upper bearing plate 1, upper sliding plate 2, upper wear-resistant plate 3, lining plate 4, inclined wear-resistant plate 5, lower wear-resistant plate 6, lower sliding plate 7 and lower bearing plate 8 are prefabricated in the factory. These parts are assembled and transported to the construction site together with the anchor bolts.

[0051] Step 4: Adjust the installation height of the bridge pier and perform structural surface treatment. Adjust the elevation of the pier top surface according to the height of the prefabricated friction damping bearing, and ensure that the upper bearing plate 1 of the friction damping bearing and the bottom surface of the beam body, and the lower bearing plate 8 and the top surface of the bridge pier are on the same horizontal plane.

[0052] Step 5: Install the friction damping bearing. Use anchor bolts and high-strength non-shrinkage cement mortar to fix the upper bearing plate 1 and the lower bearing plate 8 to the bottom surface of the main beam and the top surface of the pier respectively.

[0053] The bridge seismic isolation bearing provided by the present invention dissipates energy through the first curved sliding friction pair when the bridge is in normal use, and the vertical lifting of the beam can be controlled within the allowable range. When the relative seismic displacement between the beam and the pier is small, the second curved sliding friction pair composed of the middle curved surface of the lower sliding plate and the lower wear-resistant plate 6 participates in the work, and further dissipates the seismic energy through the conversion of the kinetic energy and potential energy of the beam during the sliding process and the sliding friction. When the relative seismic displacement between the beam and the pier is large, the third inclined sliding friction pair composed of the edge inclined surface of the lower sliding plate and the inclined wear-resistant plate 5 plays an energy dissipation and limiting role.

[0054] The seismic isolation bearing provided by the present invention has clear division of labor in graded energy consumption, simple structure, and convenient installation, and has both energy consumption limiting and self-resetting capabilities. It is suitable for seismic isolation design of bridges under earthquakes of different intensities, and has good economy and practicality.

[0055] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A friction damping bearing with multiple sliding surfaces, characterized in that: It comprises an upper support plate (1), an upper sliding plate (2), an upper wear-resistant plate (3), a lining plate (4), an inclined wear-resistant plate (5), a lower wear-resistant plate (6), a lower sliding plate (7) and a lower support plate (8); The upper support plate (1) is divided into an upper flat plate portion and a lower raised portion, wherein the cross-sectional area of ​​the flat plate portion is larger than the cross-sectional area of ​​the raised portion; the upper sliding plate (2) is fixed to the lower surface of the raised portion of the upper support plate (1) and fits tightly; The lining plate (4) is a bowl-shaped structure, the upper surface of the lining plate (4) is a curved concave surface, the lower surface is a curved surface (4-2) of the lining plate convex part, and the side surface is a lining plate side inclined surface (4-1); wherein the cross-sectional area of ​​the curved concave part is greater than the cross-sectional area of ​​the curved surface (4-2) of the lining plate convex part; the curvature of the curved concave part of the upper surface of the lining plate (4) is equal to the curvature of the lower surface of the convex part of the upper support plate (1), and the curvature radius is recorded as R1; the upper wear-resistant plate (3) is tightly fitted and fixed on the upper surface of the lining plate (4), and the upper wear-resistant plate (3) and the upper sliding plate (2) form a first curved sliding friction pair; a limit stop ring is provided on the periphery of the upper surface of the lining plate (4), and a horizontal gap exists between the limit stop ring and the periphery of the raised portion of the upper support plate (1), and the limit stop ring limits the raised portion of the upper support plate (1) during the sliding process; the inclined wear-resistant plate (5) is tightly fitted and fixed on the inclined surface (4-1) of the lining side of the lining plate (4); the lower wear-resistant plate (6) is tightly fitted and fixed on the curved surface (4-2) of the raised portion of the lining plate (4); The upper surface of the lower support plate (8) is provided with a concave surface, which is divided into a lower support edge inclined surface (8-1) and a lower support middle curved surface (8-2), wherein the curvature of the lower support middle curved surface (8-2) and the curved surface (4-2) of the lining plate protrusion are equal, and the curvature radius is recorded as R2; the inclination angle of the lower support edge inclined surface (8-1) and the inclination angle of the lining plate side inclined surface (4-1) are equal, and the inclination angle is recorded as α; the area of ​​the lower support middle curved surface (8-2) is larger than the area of ​​the lining plate protrusion. The lower sliding plate (7) is fixed on the concave surface of the upper surface of the lower support plate (8) and fits tightly, including the middle curved surface of the lower sliding plate (7) and the edge inclined surface of the lower sliding plate (7); the lower wear-resistant plate (6) and the middle curved surface of the lower sliding plate (7) constitute a second curved surface sliding friction pair; the inclined wear-resistant plate (5) and the edge inclined surface of the lower sliding plate (7) constitute a third inclined surface sliding friction pair.

2. The friction damping support with multiple sliding surfaces according to claim 1, characterized in that: The curvature radius R1 of the upper surface of the concave part of the lining plate (4) and the lower surface of the convex part of the upper support plate (1) is selected to be 10000mm-20000mm; the curvature radius R2 of the middle curved surface (8-2) of the lower support and the curved surface (4-2) of the convex part of the lining plate is selected to be R1 / 4-R1 / 2; the inclination angle α of the lower support edge inclined surface (8-1) and the lining plate side inclined surface (4-1) is selected to be 40°-50°.

3. The friction damping support with multiple sliding surfaces according to claim 1, characterized in that: The flat plate portion of the upper support plate (1) is fixedly connected to the bottom of the bridge main beam via a fastener (9); the lower surface of the lower support plate (8) is fixedly connected to the top of the bridge pier via a fastener (9).

4. The friction damping support with multiple sliding surfaces according to claim 3, characterized in that: The fastener (9) is an anchor bolt.

5. The friction damping support with multiple sliding surfaces according to claim 1, characterized in that: The upper sliding plate (2) and the lower sliding plate (7) are both made of austenitic stainless steel plates; the austenitic stainless steel plates are made of 06Cr17Ni12Mo2, 06Cr19Ni13Mo3 or 06Cr18Ni11Ti steel.

6. The friction damping support with multiple sliding surfaces according to claim 1, characterized in that: The upper wear-resistant plate (3), the inclined wear-resistant plate (5) and the lower wear-resistant plate (6) are all made of polytetrafluoroethylene, modified polytetrafluoroethylene or modified ultra-high molecular weight polyethylene.

7. The friction damping support with multiple sliding surfaces according to claim 1, characterized in that: The upper sliding plate (2) is fixed to the lower surface of the raised portion of the upper support plate (1) by welding; and the lower sliding plate (7) is fixed to the concave surface of the lower support plate (8) by welding.

8. The friction damping support with multiple sliding surfaces according to claim 1, characterized in that: The upper support plate (1), the lining plate (4) and the lower support plate (8) are all made of Q355 steel.

9. The friction damping bearing with multiple sliding surfaces according to claim 1, characterized in that: The upper wear-resistant plate (3) and the lower wear-resistant plate (6) are respectively bonded to the upper surface and the lower surface of the lining plate (4) by means of an adhesive.

10. The friction damping bearing with multiple sliding surfaces according to claim 1, characterized in that: The surfaces of the curved surfaces in the middle of the upper sliding plate (2) and the lower sliding plate (7) are provided with oil storage grooves for storing lubricants.

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