A friction damping bearing with multiple sliding surfaces

Abstract

This invention discloses a friction damping bearing with multiple sliding surfaces, belonging to the field of bridge seismic isolation bearings. The lower surface of the upper bearing plate is a convex surface with a radius of curvature R1, and an upper sliding plate is tightly fitted and fixed to the lower surface of the upper bearing plate. The upper surface of the liner plate has a concave curved surface with a radius of curvature R1, the lower surface has a convex curved surface with a radius of curvature R2, and the side surface is an inclined surface. An upper wear-resistant plate, a lower wear-resistant plate, and an inclined wear-resistant plate are tightly fitted and fixed to the upper surface, lower surface, and side surface of the liner plate, respectively. The upper surface of the lower bearing plate has a concave surface, including an inclined surface at the lower bearing edge and a curved surface at the lower bearing center with a radius of curvature R2. The lower sliding plate is tightly fitted and fixed in the concave surface of the lower bearing plate. Curved sliding friction pairs are formed between the upper wear-resistant plate and the upper sliding plate, between the curved surface at the lower sliding plate and the lower wear-resistant plate, and between the inclined surface at the lower sliding plate edge and the inclined wear-resistant plate. The multiple sliding surfaces achieve seismic energy dissipation and buffering / limiting.

Description

Technical Field

[0001] This invention belongs to the technical field of bridge seismic isolation bearings, specifically relating to a frictional seismic isolation bearing with multiple sliding surfaces. Background Technology

[0002] Seismic isolation bearings for bridges are devices used to mitigate the impact of earthquakes on bridge structures. Their primary purpose is to dissipate seismic energy during an earthquake, reducing displacement and damage to the bridge structure, thereby improving its seismic performance. Earthquake disasters have shown that the velocity pulse effect of near-field earthquakes can cause significant seismic displacement in seismically isolated bridges, leading to damage to the isolation devices and the bridge itself. Balancing energy dissipation requirements with controlling seismic displacement is a key issue that needs to be addressed in the design of seismic isolation bearings for bridges under near-field seismic loads.

[0003] Friction pendulum bearings are a common seismic isolation device. Due to their high vertical bearing capacity, excellent energy dissipation, and self-resetting capabilities, they are widely used in the seismic isolation design of highway, railway, and urban rail transit bridges. However, friction pendulum bearings use a sliding surface with a single curvature, which cannot simultaneously optimize both normal use and self-resetting functions. When the radius of curvature of the sliding surface is relatively small, it restricts the bridge's temperature deformation, but significant vertical uplift of the beam occurs during sliding. Conversely, if the radius of curvature is set too large, it weakens the bearing's self-resetting capability, resulting in residual deformation of the bridge after an earthquake, affecting its use and safety. On the other hand, friction pendulum bearings lack a buffering restraint function, and under near-field ground motion, they may generate enormous impact forces due to large bridge seismic displacements.

[0004] To address the aforementioned shortcomings of traditional friction pendulum bearings, there is an urgent need to develop a friction damping bearing with multiple sliding surfaces. Summary of the Invention

[0005] This invention addresses the shortcomings of traditional friction pendulum bearings with a single curvature, which cannot simultaneously adapt to both temperature-dependent and strong earthquake conditions. It provides a friction damping bearing with multiple sliding surfaces. This bearing is suitable for bridges requiring damping, energy dissipation, and buffering under near-fault earthquakes, while not affecting the bridge's free deformation requirements under temperature-dependent conditions.

[0006] The specific technical solution adopted in this invention is as follows:

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

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

[0009] The liner has a bowl-shaped structure, with a concave curved surface on the upper surface, a convex curved surface on the lower surface, and an inclined side surface. The cross-sectional area of ​​the concave curved surface is larger than that of the convex curved surface. The curvature of the concave curved surface on the upper surface is equal to the curvature of the lower surface of the convex upper support plate, and the radius of curvature is denoted as R1. The upper wear-resistant plate is tightly fitted and fixed to the upper surface of the liner, and the upper wear-resistant plate and the upper sliding plate form a first curved sliding friction pair. A limiting ring is provided around the upper surface of the liner, and there is a horizontal gap between the limiting ring and the outer periphery of the convex upper support plate. During sliding, the limiting ring limits the convex upper support plate. The inclined wear-resistant plate is tightly fitted and fixed to the inclined side surface of the liner. The lower wear-resistant plate is tightly fitted and fixed to the convex curved surface of the liner.

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

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

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

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

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

[0015] Preferably, the upper wear-resistant plate, the inclined 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 protruding part of the upper support plate by welding; the lower sliding plate is fixed to the concave surface of the lower support plate by welding.

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

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

[0019] Preferably, the surface of the curved portion between the upper and lower sliding plates is provided with an oil reservoir for storing lubricant.

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

[0021] 1. The friction damping bearing of this invention has multiple sliding surfaces. Under normal bridge operating conditions, energy is dissipated by the first curved surface sliding friction pair, resulting in slight vertical lifting of the beam. Under seismic conditions, due to the large radius of curvature and small sliding distance of the first curved surface, after the protruding part below the upper bearing plate makes contact with the outer retaining ring on the upper surface of the liner, the second curved surface sliding friction pair, formed by the central curved surface of the lower sliding plate and the lower wear-resistant plate, participates in the operation. Through the conversion of kinetic and potential energy of the beam during the sliding process of the second curved surface and the further dissipation of seismic energy by sliding friction, the seismic energy is further dissipated. When the relative seismic displacement between the beam and the pier is large, the third inclined surface sliding friction pair, formed by the inclined edge surface of the lower sliding plate and the inclined wear-resistant plate, plays a role in energy dissipation and buffering. This seismic damping bearing has a clear division of energy dissipation functions, simple structure, convenient installation, good durability, and long service life, and has good economic efficiency and practicality.

[0022] 2. The friction damping bearing of the present invention can effectively control the bridge displacement under seismic action. During the sliding process, the conversion of kinetic and potential energy when the structure is lifted and the friction energy dissipation are used 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, thereby achieving the purpose of limiting the displacement.

[0023] 3. In the friction damping bearing of the present invention, the lower surface of the upper support plate and the upper surface of the liner plate, as well as the lower surface of the liner plate and the upper surface of the lower support plate, are curved and inclined surfaces, respectively, which can rely on the self-weight of the upper structure as a restoring force to return to the equilibrium position. This friction damping bearing has self-resetting capability.

[0024] 4. The friction damping bearing of the present invention has multiple sliding surfaces, therefore it has no inherent period and will not resonate with any type of excitation. Avoiding resonance ensures the safety, durability, and user comfort of the bridge. Attached Figure Description

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

[0026] Figure 2 This is a disassembly diagram of the friction damping support provided in this embodiment;

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

[0028] Figure 4 This is a schematic diagram of the combination of the inclined surface at the edge of the lower support plate and the curved surface in the middle in this embodiment;

[0029] Figure 5 This is a schematic diagram of the working state of the friction damping support under a major earthquake provided in this embodiment;

[0030] In the figure: Upper support plate 1; Upper sliding plate 2; Upper wear-resistant plate 3; Liner 4; Liner side slope 4-1; Liner protrusion curved surface 4-2; Sloping wear-resistant plate 5; Lower wear-resistant plate 6; Lower sliding plate 7; Lower support plate 8; Lower support edge slope 8-1; Lower support middle curved surface 8-2; Fastener 9. Detailed Implementation

[0031] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0032] like Figure 1 As shown in the figure, 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 liner 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 this 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 by fasteners 9, and the lower surface of the lower bearing plate 8 is fixedly connected to the top of the bridge pier by fasteners 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 protruding portion, wherein the cross-sectional area of ​​the flat plate portion is larger than the cross-sectional area of ​​the protruding portion. In this embodiment, the fastener 9 is an anchor bolt. Specifically, holes for the anchor bolts to pass through are opened around the flat plate portion, and the upper support plate 1 is fixedly connected to the bottom of the bridge main beam by the anchor bolts.

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

[0035] In the device provided by this invention, the liner 4 has a bowl-shaped structure. The upper surface of the liner 4 is a curved concave surface, the lower surface is the curved surface 4-2 of the liner's protrusion, and the side surface is the inclined surface 4-1 of the liner's side. The cross-sectional area of ​​the curved concave surface is larger than the cross-sectional area of ​​the curved surface 4-2 of the liner's protrusion. The curvature of the curved surface of the concave portion of the upper surface of the liner 4 is equal to the curvature of the lower surface of the protrusion of the upper support plate 1, and the radius of curvature is denoted as R1. The upper wear-resistant plate 3 is fixed to the upper surface of the curved concave portion of the liner 4 by adhesive bonding and is tightly fitted to the upper surface of the liner 4. The upper wear-resistant plate 3 and the upper sliding plate 2 form a first curved sliding friction pair. Figure 1 As shown, a limiting ring is provided on the outer periphery of the upper surface of the liner 4. There is a horizontal gap between the limiting ring and the outer periphery of the protrusion of the upper support plate 1. During the sliding process, the limiting ring limits the protrusion of the upper support plate 1.

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

[0037] like Figure 3As shown, the liner plate 4 also has a liner plate side inclined surface 4-1 and a liner plate protruding curved surface 4-2, wherein the radius of curvature of the liner plate protruding curved surface 4-2 is denoted as R2. The radius of curvature R2 of the liner plate protruding curved surface 4-2 is smaller than the radius of curvature R1 of the lower surface of the protruding part of the upper support plate 1. The inclined wear-resistant plate 5 is fixed to the liner plate side inclined surface 4-1 by adhesive bonding and is in close contact with the liner plate side inclined surface 4-1. The lower wear-resistant plate 6 is fixed to the liner plate protruding curved surface 4-2 by adhesive bonding and is in close contact with the liner plate protruding curved surface 4-2. Therefore, the curvature of the lower wear-resistant plate 6 is equal to the curvature of the liner plate protruding 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 the lower support edge inclined surface 8-1 and the lower support middle curved surface 8-2. Several holes for anchor bolts to pass through are opened on the lower surface of the lower support plate 8, and the lower support plate 8 is fixedly connected to the top of the pier by anchor bolts.

[0039] In this embodiment, the lower sliding plate 7 is made of mirror-finished austenitic stainless steel. 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 together. 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 protruding part of the liner plate, and the radius of curvature of the middle curved surface 8-2 of the lower support is also denoted as R2. The inclination angle of the edge inclined surface 8-1 of the lower support is equal to the inclination angle of the side inclined surface 4-1 of the liner plate, and the inclination angle is denoted 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 liner plate, and there is a relative sliding space between the two.

[0040] The middle curved surface of the lower wear-resistant plate 6 and the lower sliding plate 7 constitutes the second curved surface sliding friction pair, and the inclined surface of the inclined wear-resistant plate 5 and the edge inclined surface of the lower sliding plate 7 constitutes the third inclined surface sliding friction pair. The surfaces of the middle curved surfaces of the upper sliding plate 2 and the lower sliding plate 7 are provided with oil reservoirs for storing lubricant, and the coefficient of friction is adjusted by using lubricant.

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

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

[0043] When the seismic displacement has not yet exceeded the design displacement, the upper support plate 1 shifts, and the edge of the protruding part below the upper support plate 1 contacts the limiting retaining ring around the liner plate 4. The displacement of the upper support plate 1 causes the entire liner plate 4 to shift, resulting in sliding friction between the lower wear-resistant plate 6 on the lower surface of the liner plate 4 and the lower sliding plate 7 on the upper surface of the lower support plate 8. The seismic energy is further dissipated through the sliding friction between the curved surfaces of the lower wear-resistant plate 6 and the lower sliding plate 7, as well as the conversion of kinetic and potential energy during the lifting of the beam, while increasing the horizontal stiffness and deformation recovery force of the bridge.

[0044] like Figure 5 As shown, further, when the seismic displacement exceeds the design displacement, the inclined surface 4-1 on the side of the liner plate and the inclined surface 8-1 on the edge of the lower support come into contact. During the sliding process, the inclined surface of the edge of the lower support plate 8 can effectively limit the relative displacement of the upper and lower structures, thereby achieving the purpose of limiting the displacement.

[0045] Based on the traditional sliding friction bearing, this invention achieves the seismic resistance purpose of graded energy dissipation and limiting according to the seismic displacement requirements by setting up multiple sliding surfaces, including the small curvature curved sliding surface between the upper bearing plate and the upper surface of the liner, the curved sliding surface between the middle surface of the lower bearing plate and the protruding part of the liner, the inclined sliding surface between the edge of the lower bearing plate and the side surface of the liner, and the limiting measures of the lower bearing plate, thus ensuring the post-earthquake usability of the bridge.

[0046] It should be noted that in this invention, both the upper sliding plate 2 and the lower sliding plate 7 are made of austenitic stainless steel, which can be selected from 06Cr17Ni12Mo2, 06Cr19Ni13Mo3, or 06Cr18Ni11Ti steel. 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. The upper support plate 1, the liner plate 4, and the lower support plate 8 are all made of Q355 steel.

[0047] Furthermore, 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 this example only uses a concrete bridge under construction. Appropriate adjustments need to be made for other types of bridges in different working conditions:

[0048] Step 1: Friction Damping Bearing Parameter Design. Based on the bridge's seismic capacity requirements and the installation space for the friction damping bearings, determine the required friction damping bearing parameters, including the dimensions and fixing requirements of the upper bearing plate 1 and lower bearing plate 8, the friction coefficients of the upper wear-resistant plate 3, the inclined wear-resistant plate 5, and the lower wear-resistant plate 6, the structural dimensions and installation requirements of the liner plate 4, and the maximum allowable relative displacement, etc.

[0049] Step Two: According to the bridge seismic isolation bearing design documents, when pouring non-shrink cement mortar, reserve installation holes in the steel molds of the piers or main beams. The placement of the reserved holes needs to appropriately account for positional deviations caused by construction errors, so as to ensure that the anchor bolts of the bridge friction damping bearings have a certain degree of freedom during the later installation.

[0050] Step 3: Factory fabrication and assembly of friction damping bearings. Based on the friction damping bearing parameters determined in Step 1, prefabricate the upper bearing plate 1, upper sliding plate 2, upper wear-resistant plate 3, liner plate 4, inclined wear-resistant plate 5, lower wear-resistant plate 6, lower sliding plate 7, and lower bearing plate 8 in the factory. Assemble these components and transport them to the construction site along with the anchor bolts.

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

[0052] Step 5: Install friction damping bearings. Use anchor bolts and high-strength non-shrink 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 this invention dissipates energy through a first curved surface sliding friction pair during normal bridge operation, keeping the vertical lift of the beam within acceptable limits. When the relative seismic displacement between the beam and the pier is small, a second curved surface sliding friction pair, consisting of the middle curved surface of the lower sliding plate and the lower wear-resistant plate 6, participates in the operation, further dissipating seismic energy through the conversion of kinetic and potential energy of the beam during sliding and through sliding friction. When the relative seismic displacement between the beam and the pier is large, a third inclined surface sliding friction pair, consisting of the inclined edge surface of the lower sliding plate and the inclined wear-resistant plate 5, plays a role in energy dissipation and limiting.

[0054] The seismic isolation bearing provided by this invention has a clear division of energy dissipation functions, a simple structure, and is easy to install. It also has energy dissipation limiting and self-resetting capabilities, making it suitable for bridge seismic isolation design under earthquakes of different intensities. It has good economic efficiency and practicality.

[0055] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A friction damping bearing with multiple sliding surfaces, characterized in that, It includes an upper support plate (1), an upper sliding plate (2), an upper wear-resistant plate (3), a liner (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 part and a lower protruding part, wherein the cross-sectional area of ​​the flat plate part is larger than the cross-sectional area of ​​the protruding part; the upper sliding plate (2) is fixed to the lower surface of the protruding part of the upper support plate (1) and fits tightly. The liner (4) has a bowl-shaped structure. The upper surface of the liner (4) is a curved concave surface, the lower surface is the curved surface of the liner protrusion (4-2), and the side surface is the inclined surface of the liner side (4-1). The cross-sectional area of ​​the curved concave surface is greater than the cross-sectional area of ​​the curved surface of the liner protrusion (4-2). The curvature of the curved concave surface of the upper surface of the liner (4) is equal to the curvature of the lower surface of the protrusion of the upper support plate (1), and the radius of curvature is denoted as R1. The upper wear-resistant plate (3) is tightly fitted and fixed to the upper surface of the liner (4). (3) and the upper sliding plate (2) form a first curved surface sliding friction pair; the outer periphery of the upper surface of the liner (4) is provided with a limiting ring, and there is a horizontal gap between the limiting ring and the outer periphery of the protrusion of the upper support plate (1). During the sliding process, the limiting ring limits the protrusion of the upper support plate (1); the inclined wear-resistant plate (5) is tightly attached to the inclined surface (4-1) of the liner side of the liner (4); the lower wear-resistant plate (6) is tightly attached to the curved surface (4-2) of the protrusion of the liner (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). The curvature of the lower support middle curved surface (8-2) and the liner protrusion curved surface (4-2) are equal, and the radius of curvature is denoted as R2. The inclination angle of the lower support edge inclined surface (8-1) and the inclination angle of the liner side inclined surface (4-1) are equal, and the inclination angle is denoted as a. The area of ​​the lower support middle curved surface (8-2) is larger than that of the liner protrusion. The area of ​​the curved surface (4-2) is such that there is a relative sliding space between them; 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 middle curved surface of the lower wear-resistant plate (6) and the lower sliding plate (7) constitute the second curved surface sliding friction pair; the inclined wear-resistant plate (5) and the edge inclined surface of the lower sliding plate (7) constitute the third inclined surface sliding friction pair; The radius of curvature R1 of the upper surface of the concave part of the liner (4) and the lower surface of the protruding part of the upper support plate (1) is selected as 10000mm~20000mm; the radius of curvature R2 of the middle curved surface (8-2) of the lower support and the curved surface (4-2) of the protruding part of the liner is selected as R1 / 4~R1 / 2; the inclination angle α of the edge inclined surface (8-1) of the lower support and the side inclined surface (4-1) of the liner is selected as 40°~50°.

2. 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 main beam of the bridge by fasteners (9); the lower surface of the lower support plate (8) is fixedly connected to the top of the pier by fasteners (9).

3. The friction damping support with multiple sliding surfaces according to claim 2, characterized in that, The fastener (9) is an anchor bolt.

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

5. 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.

6. 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 protruding part of the upper support plate (1) by welding; the lower sliding plate (7) is fixed to the concave surface of the lower support plate (8) by welding.

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

8. The friction damping support 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 and lower surfaces of the liner (4) by adhesive.

9. The friction damping support with multiple sliding surfaces according to claim 1, characterized in that, The surfaces of the curved sections between the upper sliding plate (2) and the lower sliding plate (7) are provided with oil reservoirs for storing lubricant.

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