Friction pendulum type support
By employing a retaining bar and shear key structure in the friction pendulum bearing, combined with the design of a sliding bar and wear-resistant plate, the instability and economic issues of the friction pendulum bearing are solved, achieving a more uniform shear force distribution and seismic energy dissipation, and realizing the miniaturization and efficient seismic isolation effect of the bearing.
Patent Information
- Application Number
- CN202520219629.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-02-12
AI Technical Summary
Existing friction pendulum bearings suffer from problems such as unstable overall performance, excessive size, and poor economy due to the shear pin structure.
The shear pin is replaced by a barrier strip and shear key structure. Combined with the design of sliding strip and wear-resistant plate, the shear key is ensured to be uniformly stressed, reducing material consumption, improving stability and economy. The notch design allows for timely shearing when needed to prevent plastic deformation.
It achieves uniform shear force distribution, reduces the mass and cost of friction pendulum bearings, facilitates transportation, improves stability and economy, reduces seismic energy input, extends service life, and enhances fatigue resistance.
Smart Images
Figure CN223646928U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to railway bridge technical field, concretely relates to a friction pendulum bearing. BACKGROUND
[0002] Friction pendulum bearing has been widely applied due to its excellent shock insulation performance, and through setting friction pendulum bearing, the damage and destruction of bridge structure caused by earthquake can be effectively reduced.
[0003] In prior art, as shown in Figure 1 、 Figure 2 、 Figure 3 , the friction pendulum bearing usually adopts shear pin as limiting device, and the shear pin is usually provided with multiple, when earthquake occurs, the shear pin is sheared, and the whole friction pendulum bearing starts to swing, so as to avoid the bridge structure from being damaged in one step, but when earthquake does not occur, the bridge structure will swing due to vehicle driving and other reasons, the shear pin in stress concentration area is broken, thereby affecting the overall performance of the whole friction pendulum bearing, and the bridge structure is unstable when earthquake does not occur.In addition, multiple shear pins are set, which needs to rely on the setting position and spacing of shear pin, and in order to ensure that the size of horizontal shear force can be effectively borne, the number of shear pins is large, thereby causing the whole structure of friction pendulum bearing to be large and heavy, the consumption of materials is increased, the installation is inconvenient and the transportation is difficult, and the economy of the whole friction pendulum bearing is significantly affected. TECHNICAL CONTENT
[0004] The utility model provides a friction pendulum bearing to solve the technical problem of unstable overall performance, too large volume and poor economy of friction pendulum bearing in prior art.
[0005] The technical scheme of the friction pendulum bearing provided by the utility model is as follows:
[0006] A friction pendulum bearing includes an upper support plate, a lower support plate, baffles, and a spherical crown liner. The spherical crown liner is slidably installed between the lower support plate and the upper support plate. The spherical crown liner includes an upper convex surface and a lower convex surface. The upper surface of the lower support plate includes a lower support plate concave surface, which mates with the lower convex surface. The lower surface of the upper support plate includes an upper support plate concave surface, which mates with the upper convex surface. The curvature of the upper support plate concave surface is less than that of the lower support plate concave surface. At least two baffles are provided. Symmetrically arranged on the outer side of the lower support plate, the stop bar is fixedly installed on the upper support plate. The stop bar has a sliding strip at the mating surface with the lower support plate. The upper surface of the stop bar has a lower shear keyway. A shear key is installed in the lower shear keyway. The lower surface of the upper support plate also includes a mounting surface. The mounting surface is located on the outer side of the concave curved surface. The mounting surface has an upper shear keyway. The shear key includes a lower part of the shear key, an upper part of the shear key, and a shearing part. The lower part of the shear key is installed in the lower shear keyway, the upper part of the shear key is installed in the upper shear keyway, and a notch is provided at the shearing part.
[0007] Furthermore, an upper wear-resistant plate and a lower wear-resistant plate are respectively provided on the upper convex curved surface and the lower convex curved surface. The upper wear-resistant plate and the lower wear-resistant plate are respectively embedded in the upper convex curved surface and the lower convex curved surface of the spherical crown liner. The concave curved surface of the lower support plate mates with the lower wear-resistant plate, and the concave curved surface of the upper support plate mates with the upper wear-resistant plate.
[0008] Furthermore, a wear-resistant strip is provided at the mating surface between the lower support plate and the stop strip.
[0009] Furthermore, the slider is made of stainless steel.
[0010] Furthermore, the lower surface of the upper support plate also includes a mounting surface, which is located on the outside of the concave curved surface, and the stop bar is fixed to the mounting surface by bolts.
[0011] Furthermore, the gap is either a U-shaped gap or a V-shaped gap.
[0012] Furthermore, rounded chamfers are provided at the lower part of the notch and the corner of the shear key.
[0013] Furthermore, the lengths of both the lower and upper shear keyways are greater than the length of the shear key.
[0014] Furthermore, the friction pendulum support is a fixed friction pendulum support, with four baffles arranged around the lower support plate, and two adjacent baffles are arranged perpendicular to each other.
[0015] The beneficial effects are:
[0016] (1) By setting up a stop bar and shear key instead of shear pin, the shear key is an integral structure. When the bridge vibrates, the shear key is subjected to force as a whole, the force is more uniform, the force is better, and it can effectively bear the horizontal shear force. Unlike multiple shear pins, it does not require consideration of the spacing of each shear pin. It can reduce material consumption, reduce weight and overall cost while ensuring good force performance. It also facilitates the miniaturization of friction pendulum bearings, making them easier to transport and effectively improving the economy of the entire friction pendulum bearing.
[0017] (2) The shear bar is subjected to force as a whole, unlike the existing technology which uses multiple shear pin structures. When subjected to shearing, only a portion of the shear pins are subjected to force, and some shear pins are subjected to little or no force. This effectively avoids the situation where the actual load-bearing capacity is far lower than the design load due to the shear pins breaking in some positions, thus improving the stability of the friction pendulum support.
[0018] (3) By setting a sliding strip, the lower support plate can slide relative to the shear stop. The outer side of the lower support plate is provided with a wear-resistant strip to protect the lower support plate, prevent damage to the lower support plate, and ensure the service life of the lower support plate.
[0019] (4) When the upper support plate slides to the end, the stress distribution is triangular and the stress at different positions is uneven. The shear bar can bear the force as a whole, unlike the traditional friction pendulum support which uses multiple shear pins. Only a portion of the shear pins bear the force, and a portion of the shear pins bear little or no force. This effectively avoids the situation where the actual load bearing capacity is far lower than the design load due to the shear pins breaking at some positions.
[0020] (5) The curvature of the concave surface of the upper support plate is less than that of the concave surface of the lower support plate, thereby adjusting the sliding period of the upper support plate. The swing of the bridge structure above the upper support plate can be far away from the dominant period of the earthquake, reducing the input of earthquake energy. At the same time, the friction between the upper support plate, the lower support plate and the spherical crown liner consumes earthquake energy, reducing the input of earthquake energy and preventing the bridge structure from being damaged.
[0021] (6) By setting notches on the shear keys, the strength of the shear keys can be reduced at the notch locations. When the bridge is in normal operating conditions, the displacement in the limiting direction is constrained by the shear keys as a whole. When the horizontal force on the friction pendulum bearing is greater than the initial force for vibration reduction and isolation, the shear key can be sheared off at the notch locations in time, preventing the pier from undergoing plastic deformation due to excessive internal forces, which could lead to damage. After the shear key is sheared off, the limiting device is released, and the bearing can slide freely in the limiting direction, ensuring that its vibration reduction and isolation function can be effectively performed. In addition, the shear keys also need to withstand dynamic loads such as horizontal vehicles and wind loads under normal operating conditions. By setting the notches as U-shaped or V-shaped notches, the stress concentration at the notches can be effectively reduced, improving the fatigue resistance of the shear keys.
[0022] (7) The friction pendulum support is a fixed friction pendulum support. The four stops of the fixed friction pendulum support are arranged around the lower support plate and the two adjacent stops are perpendicular to each other, so that the shear keys on the four stops can also be arranged around the outside of the lower support plate, presenting a square structure. The square structure arrangement is convenient for production and processing, and the horizontal force is uniform, with excellent shear resistance.
[0023] (8) The lengths of the lower shear keyway and the upper shear keyway are both greater than the length of the shear key, so that there is a certain gap between the lower shear keyway and the upper shear keyway and the end of the shear key, so that the shear key can slide in the lower shear keyway and the upper shear keyway, and does not interfere with the sliding of the upper support plate, the lower support plate and the spherical crown liner, making the overall force clearer.
[0024] (9) The retaining ring of the traditional fixed friction pendulum support adopts a circular structure. The shear pins in the structure are arranged in a ring, which is difficult to process, has poor economy, and uneven force. The outer ring of this friction pendulum support adopts a square structure, and the shear keys are arranged in straight lines on the four sides. This structure is simple to process, and the force is uniform when subjected to horizontal force. Its horizontal shear resistance is better than that of the traditional friction pendulum support. [Attached Image Description]
[0025] Figure 1 This is a schematic diagram of the existing shear pin installation structure;
[0026] Figure 2 This is a diagram showing the shear stress distribution of the shear pin when the horizontal displacement reaches the center in the existing technology;
[0027] Figure 3 This is a diagram showing the shear stress distribution of the shear pin when the object is horizontally displaced to the edge in existing technology.
[0028] Figure 4 This is a stress distribution diagram of the shear force on the friction pendulum support pin of Embodiment 1 provided by this utility model;
[0029] Figure 5 This is a schematic diagram of the friction pendulum support structure of Embodiment 1 provided by this utility model;
[0030] Figure 6 This is a partially enlarged view of the shear key installation structure of Embodiment 1 provided by this utility model;
[0031] Figure 7 This is a schematic diagram of the shear key structure of Embodiment 1 provided by this utility model;
[0032] Figure 8 This is a top view of the shear key in Embodiment 1 provided by this utility model;
[0033] 1. Upper support plate; 2. Spherical crown liner; 3. Lower support plate; 21. Upper wear-resistant plate; 23. Lower wear-resistant plate; 4. Stop bar; 41. Shear key; 411. Notch; 42. Sliding bar; 31. Wear-resistant strip; 5. Shear pin.
Detailed Implementation Methods
[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings.
[0035] Specific embodiment 1 of the friction pendulum support provided by this utility model:
[0036] This embodiment provides a friction pendulum support, such as Figure 5 , Figure 6 As shown, the system includes an upper support plate, a stop strip, a spherical crown liner, and a lower support plate. The spherical crown liner is slidably installed between the lower support plate and the upper support plate. The spherical crown liner includes an upper convex curved surface and a lower convex curved surface. An upper wear-resistant plate and a lower wear-resistant plate are respectively provided on the upper and lower convex curved surfaces, and the upper and lower wear-resistant plates are respectively embedded in the upper and lower convex curved surfaces of the spherical crown liner. The upper surface of the lower support plate includes a lower support plate concave curved surface, which mates with the lower wear-resistant plate. The lower surface of the upper support plate includes an upper support plate concave curved surface, which mates with the upper wear-resistant plate. Figure 2 As shown, the curvature of the concave surface of the upper support plate is less than that of the concave surface of the lower support plate. During an earthquake, the spherical cap liner slides on the lower support plate, and the upper support plate slides on the spherical cap liner. The entire superstructure of the bridge undergoes a pendulum motion. The curvature of the concave surface of the upper support plate is less than that of the concave surface of the lower support plate, which changes the radius of the overall sliding motion. This adjusts the period of the pendulum motion of the entire superstructure of the bridge, making it far away from the dominant period of the earthquake, thereby reducing the input of seismic energy. At the same time, friction is generated between the wear-resistant plate and the spherical cap liner, which dissipates seismic energy through friction, preventing bridge damage.
[0037] Symmetrical stop bars are provided on both sides of the lower support plate, with at least two stop bars symmetrically arranged on the outer side of the lower support plate. The stop bars are fixedly installed on the upper support plate. Figure 6 , Figure 10 , Figure 11 As shown, the friction pendulum support is a fixed friction pendulum support. The fixed friction pendulum support has four stops, which are arranged around the lower support plate, with adjacent stops perpendicular to each other. A lower shear keyway is provided on the upper surface of each stop, and a shear key is installed within the lower shear keyway. The structure of the shear key is as follows: Figure 7 , Figure 8As shown, a sliding strip is provided on the mating surface of the shear bar with the lower support plate. The sliding strip is used to ensure that the lower support plate can slide relative to the shear bar. In this embodiment, the sliding strip is a stainless steel strip with a smooth surface, thereby effectively ensuring that the lower support plate can slide relative to the shear bar. A wear-resistant strip is provided on the mating surface of the lower support plate with the shear bar. The wear-resistant strip is used to protect the lower support plate, prevent wear, and ensure the service life of the lower support plate. When an earthquake occurs, and the shear key and the shear bar are sheared, as... Figure 9 As shown, the friction pendulum bearing begins to swing, converting the kinetic energy of the bridge caused by the earthquake into potential energy. Furthermore, the upper wear-resistant plate and the concave surface of the upper bearing plate have a certain coefficient of friction. During the swinging process of the upper bearing plate, some kinetic energy is consumed through friction, thus comprehensively achieving effective seismic isolation of the friction pendulum bearing. The entire friction pendulum bearing effectively extends the natural period of the upper structure above the upper bearing plate, reducing the dynamic amplification effect caused by the earthquake and avoiding damage to the bridge structure. When no earthquake occurs, under normal use, the shear key of the friction pendulum bearing is an integral structure that can achieve overall force bearing, such as... Figure 3 The force is more evenly distributed, effectively bearing horizontal shear force. In this embodiment, the lengths of both the lower and upper shear keyways are greater than the length of the shear key, creating a certain gap between the lower and upper shear keyways and the end of the shear key, allowing the shear key to slide within the lower and upper shear keyways.
[0038] In this embodiment, the lower surface of the upper support plate also includes a mounting surface, located on the outer side of the concave curved surface. The stop bar is fixed to the mounting surface by bolts. An upper shear keyway is provided on the mounting surface. The shear key includes a lower shear key, an upper shear key, and a shearing part. The lower shear key is installed in the lower shear keyway, the upper shear key is installed in the upper shear keyway, and the shearing part is located between the lower and upper shear key. A notch is provided at the shearing part, aligned with the mounting surface. When the horizontal force borne by the support exceeds the initial force for seismic isolation, the shear key can be promptly sheared from the shearing part, preventing the pier from undergoing plastic deformation due to excessive internal forces, thus preventing damage. After the shear key is sheared, the limiting effect of the shear key is released, allowing the spherical crown liner to slide on the lower support plate and the upper support plate to slide on the spherical crown liner, effectively fulfilling its seismic isolation function. In this embodiment, as... Figure 4 As shown, the shear section is located in the middle of the shear key, and the notch is a U-shaped notch. The U-shaped notch and the lower part of the shear key and the corner of the shear key are provided with arc-shaped chamfers. Under normal working conditions, the upper shear key also needs to withstand dynamic loads such as horizontal vehicles and wind loads. By setting the notch as a U-shaped notch and providing arc-shaped chamfers, the stress concentration at the notch can be effectively reduced, and the fatigue resistance of the shear key can be improved.
[0039] Specific embodiment 2 of the friction pendulum support provided by this utility model:
[0040] The friction pendulum support provided in this embodiment differs from that in Embodiment 1 only in that the upper and lower convex curved surfaces are not provided with upper and lower wear-resistant plates. Instead, a coating of wear-resistant material is directly applied to the surfaces of the upper and lower convex curved surfaces, or a spherical crown liner is made of wear-resistant material.
[0041] Specific embodiment 3 of the friction pendulum support provided by this utility model:
[0042] The friction pendulum support provided in this embodiment differs from that in Embodiment 1 only in that a wear-resistant strip is not separately provided at the mating surface between the lower support plate and the stop strip; instead, a wear-resistant coating is directly provided at the mating surface between the support plate and the stop strip, or a wear-resistant material is used.
[0043] Specific embodiment 4 of the friction pendulum support provided by this utility model:
[0044] The friction pendulum support provided in this embodiment differs from that in Embodiment 1 only in that the notch is a V-shaped notch.
[0045] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
[0046] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0047] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
Claims
1. A friction pendulum bearing, comprising an upper bearing plate, a lower bearing plate, a stop bar, and a spherical crown liner, wherein the spherical crown liner is slidably installed between the lower bearing plate and the upper bearing plate, characterized in that, The spherical crown liner includes an upper convex curved surface and a lower convex curved surface. The upper surface of the lower support plate includes a lower support plate concave curved surface, which mates with the lower convex curved surface. The lower surface of the upper support plate includes an upper support plate concave curved surface, which mates with the upper convex curved surface. The curvature of the upper support plate concave curved surface is less than the curvature of the lower support plate concave curved surface. The friction pendulum support includes stop bars, at least two of which are symmetrically arranged on the outer side of the lower support plate. The stop bars are fixedly installed... Mounted on the upper support plate, the stop bar has a sliding strip at the mating surface with the lower support plate. The upper surface of the stop bar has a lower shear keyway, and a shear key is installed in the lower shear keyway. The lower surface of the upper support plate also includes a mounting surface, which is located outside the concave curved surface. The mounting surface has an upper shear keyway. The shear key includes a lower part, an upper part, and a shearing part. The lower part of the shear key is installed in the lower shear keyway, the upper part is installed in the upper shear keyway, and a notch is provided at the shearing part.
2. The friction pendulum support according to claim 1, characterized in that, An upper wear-resistant plate and a lower wear-resistant plate are respectively provided on the upper convex curved surface and the lower convex curved surface. The upper wear-resistant plate and the lower wear-resistant plate are respectively embedded in the upper convex curved surface and the lower convex curved surface. The concave curved surface of the lower support plate cooperates with the lower wear-resistant plate, and the concave curved surface of the upper support plate cooperates with the upper wear-resistant plate.
3. A friction pendulum support according to claim 1, characterized in that, Wear-resistant strips are provided at the mating surface between the lower support plate and the stop strip.
4. A friction pendulum support according to claim 1, characterized in that, The slide bar is made of stainless steel.
5. A friction pendulum support according to claim 1, characterized in that, The lower surface of the upper support plate also includes a mounting surface, which is located on the outer side of the concave curved surface of the upper support plate, and the stop bar is fixed to the mounting surface by bolts.
6. A friction pendulum support according to claim 1, characterized in that, The notch is a U-shaped notch or a V-shaped notch.
7. A friction pendulum support according to claim 1, characterized in that, The notch, the lower part of the shear key, and the corner position of the shear key are provided with arc-shaped chamfers.
8. A friction pendulum support according to claim 1, characterized in that, The lengths of both the lower and upper shear keyways are greater than the length of the shear key.
9. A friction pendulum support according to claim 1, characterized in that, The friction pendulum support is a fixed friction pendulum support with four stops. The four stops are arranged around the lower support plate, and two adjacent stops are arranged perpendicular to each other.