Friction pendulum support and equivalent radius calculation method thereof

Abstract

The friction pendulum support comprises an upper seat plate, a middle seat plate, a rotating plate and a sliding plate which are sequentially arranged from top to bottom, the upper seat plate is provided with an annular boss, the side wall of the rotating plate is a first convex spherical surface, and the inner surface of the annular boss makes contact with the first convex spherical surface; when the friction pendulum support moves, the inner surface of the annular boss slides relative to the first convex spherical surface. According to the friction pendulum support, the annular boss of the upper seat plate makes contact with the first convex spherical surface of the rotating plate, an existing force transmission mode is changed, the upper seat plate directly acts force on the rotating plate, and compared with an existing friction pendulum support, under the condition of the same design displacement and equivalent radius, the friction pendulum support has the advantages that the friction force is greatly reduced, and the service life is prolonged. The horizontal restoring force of the friction pendulum support is larger, the height of the support can be reduced, and therefore the support with unconventional requirements is designed, and the requirement for the field installation size of the support is met.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction and isolation of bridge, building and other engineering projects, and in particular to a friction pendulum bearing and a method for calculating its equivalent radius. Background Art

[0002] The bearing is an important part of bridge construction. As the connecting unit between the bridge and the pier, it can slide and rotate normally in daily work to release the temperature load of the bridge. When an earthquake occurs, it can reduce the effect of the seismic force on the bridge and realize the seismic isolation function. For example, the friction pendulum bearing uses the pendulum principle to realize the seismic isolation function. It consumes seismic energy through friction on the sliding interface to realize the shock absorption function, and extends the beam movement period through spherical swing to realize the seismic isolation function.

[0003] In the process of bridge design and manufacturing in some special cases, some extraordinary design parameters are required for bridge bearings, that is, the on-site installation dimensions of bridge bearings belong to conventional requirements, but the design requirements of bearings greatly exceed the conventional design requirements, which are often reflected in the product height. For example, in the relevant technology, under the conditions of the same design displacement and equivalent radius, the height of conventional friction pendulum bearings is about 300mm, while the bridge piers in a certain project have been completed and the height requirement cannot exceed 240mm. Under the requirements of the on-site installation dimensions of conventional bearings, it becomes very difficult to design bearings with unconventional requirements. Summary of the invention

[0004] The present application provides a friction pendulum bearing and a method for calculating its equivalent radius, which solves the technical problem in the related art that it is difficult to design a bearing with unconventional requirements under the requirements of the on-site installation dimensions of the conventional bearing.

[0005] In a first aspect, an embodiment of the present application provides a friction pendulum bearing, which includes an upper seat plate, a middle seat plate, a rotating plate, and a sliding plate arranged in sequence from top to bottom, the upper seat plate having an annular boss, the side wall of the rotating plate being a first convex spherical surface, the inner surface of the annular boss being in contact with the first convex spherical surface, so that when the friction pendulum bearing is displaced, the inner surface of the annular boss slides relative to the first convex spherical surface.

[0006] In combination with the first aspect, in one embodiment, the upper seat plate also includes a first flat plate covering the annular boss, and a first mirror stainless steel plate provided on the side of the first flat plate close to the annular boss, and a first flat sliding plate is embedded on the side of the middle seat plate close to the upper seat plate, and the first mirror stainless steel plate and the first flat sliding plate form a planar sliding friction pair.

[0007] In combination with the first aspect, in one implementation, a side of the middle seat plate facing away from the upper seat plate is a first concave spherical surface, in which a spherical rotating plate is embedded.

[0008] In combination with the first aspect, in one implementation, a side of the rotating plate close to the middle seat plate is a second convex spherical surface, and the spherical rotating plate and the second convex spherical surface form a rotating friction pair.

[0009] In combination with the first aspect, in one embodiment, the surface of the second convex spherical surface is covered with a second mirror stainless steel plate or a first metal coating, and the second mirror stainless steel plate or the first metal coating and the spherical rotating plate form the rotating friction pair.

[0010] In combination with the first aspect, in one embodiment, the side of the rotating plate facing away from the middle seat plate is a third convex spherical surface, in which a spherical sliding plate is embedded, and the side of the sliding plate close to the rotating plate is a second concave spherical surface, and the spherical sliding plate and the second concave spherical surface form a spherical sliding friction pair.

[0011] In combination with the first aspect, in one embodiment, the surface of the second concave spherical surface is covered with a third mirror stainless steel plate or a second metal coating, and the third mirror stainless steel plate or the second metal coating and the spherical sliding plate form the rotational friction pair.

[0012] In combination with the first aspect, in one embodiment, the side wall of the rotating plate is formed to extend from a side thereof facing away from the middle seat plate to a side thereof close to the middle seat plate.

[0013] In combination with the first aspect, in one embodiment, the friction pendulum support further includes a retaining ring or a retaining plate disposed between the upper seat plate and the sliding plate.

[0014] In a second aspect, the present application also provides a method for calculating the equivalent radius of a friction pendulum support, using any of the friction pendulum supports described above, the equivalent radius R c The calculation formula is:

[0015] Among them, R z is the radius of the motion trajectory of the contact point between the rotating plate and the upper seat plate; R is the rotation radius; r is the sliding radius; h is the distance from the lowest point to the highest point of the rotating plate.

[0016] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0017] The present application provides a friction pendulum bearing, in which the annular boss of the upper seat plate contacts the first convex spherical surface of the rotating plate, so that when the friction pendulum bearing is displaced, the annular boss and the first convex spherical surface slide relative to each other. In the above process, the existing force transmission method is changed, and the upper seat plate directly applies force to the rotating plate. Compared with the existing friction pendulum bearing, under the same design displacement and equivalent radius, the friction pendulum bearing provided by the present application has a greater horizontal restoring force and can reduce the bearing height, thereby designing a bearing with unconventional requirements and meeting the requirements of the bearing's on-site installation dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of an existing friction pendulum support.

[0020] Figure 2 Schematic diagram of the structure of a friction pendulum support in one embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the upper seat plate in one embodiment of the present invention.

[0022] Figure 4 for Figure 3 A cross-sectional view of the upper seat plate is shown.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the seat plate in one embodiment of the present invention.

[0024] Figure 6 for Figure 5 A cross-sectional view of the center seat plate is shown.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of a rotating plate in one embodiment of the present invention.

[0026] Figure 8 for Figure 7 A cross-sectional view of the rotating plate shown.

[0027] Fig. 9 FIG. 1 is a schematic diagram of the three-dimensional structure of a sliding plate in one embodiment of the present invention.

[0028] Fig.10 for Fig. 9 Cross-sectional view of the sliding plate.

[0029] Fig.11It is a schematic diagram of the structure after the friction pendulum support is displaced in one embodiment of the present invention.

[0030] Fig.12 It is a schematic structural diagram of a friction pendulum support in another embodiment of the present invention.

[0031] In the figure: 1. existing friction pendulum bearing; 11. first seat plate; 12. second seat plate; 13. third seat plate; 2. friction pendulum bearing; 21. upper seat plate; 211. annular boss; 212. first flat plate; 213. first mirror stainless steel plate; 22. middle seat plate; 220. first groove; 221. first flat plate sliding plate; 222. first concave spherical surface; 223. spherical rotating plate; 224. second groove; 23. rotating plate; 231. first convex spherical surface; 232. second convex spherical surface; 233. third convex spherical surface; 234. spherical sliding plate; 24. sliding plate; 241. second concave spherical surface; 25. baffle. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] like Figure 1 As shown, Figure 1 It is a structural schematic diagram of an existing friction pendulum support.

[0034] The existing friction pendulum support 1 includes a first seat plate 11, a second seat plate 12 and a third seat plate 13 arranged in sequence from top to bottom. A spherical friction pair is formed between the first seat plate 11 and the second seat plate 12, and a sliding friction pair is formed between the second seat plate 12 and the third seat plate 13. The force is transmitted from the spherical friction pair to the sliding friction pair.

[0035] In the existing friction pendulum bearing 1, under the same vertical pressure, the smaller the equivalent radius, the greater the horizontal restoring force, but the higher the bearing height, the greater the horizontal restoring force, which may not meet the requirements of the on-site installation dimensions of some bearings.

[0036] Among them, the restoring force refers to the resultant force that falls back to the center of the bearing through its own gravity to overcome friction after the bearing has undergone seismic isolation displacement.

[0037] The embodiment of the present application provides a friction pendulum bearing and a method for calculating its equivalent radius, which can solve the technical problem in the related art that it is difficult to design a bearing with unconventional requirements under the requirements of the on-site installation dimensions of a conventional bearing.

[0038] like Figure 2 As shown, Figure 2 Schematic diagram of the structure of a friction pendulum support in one embodiment of the present invention.

[0039] The present embodiment provides a friction pendulum bearing 2, which includes an upper seat plate 21, a middle seat plate 22, a rotating plate 23, and a sliding plate 24 arranged in sequence from top to bottom. The upper seat plate 21 has an annular boss 211, and the side wall of the rotating plate 23 is a first convex spherical surface 231. The inner surface of the annular boss 211 contacts the first convex spherical surface 231, so that when the friction pendulum bearing 2 is displaced, the inner surface of the annular boss 211 and the first convex spherical surface 231 slide relative to each other.

[0040] The present embodiment provides a friction pendulum bearing, in which the annular boss of the upper seat plate contacts the first convex spherical surface of the rotating plate, so that when the friction pendulum bearing is displaced, the annular boss and the first convex spherical surface slide relative to each other. In the above process, the existing force transmission method is changed, and the upper seat plate directly applies force to the rotating plate. Compared with the existing friction pendulum bearing, under the same design displacement and equivalent radius, the friction pendulum bearing provided by the present application has a greater horizontal restoring force and can reduce the bearing height, thereby designing a bearing with unconventional requirements and meeting the requirements of the bearing's on-site installation dimensions.

[0041] like Figure 2 , Figure 3 and Figure 4 As shown, Figure 3 It is a schematic diagram of the three-dimensional structure of the upper seat plate in one embodiment of the present invention. Figure 4 for Figure 3 A cross-sectional view of the upper seat plate is shown.

[0042] In one embodiment, the upper seat plate 21 further includes a first flat plate 212 covering the annular boss 211 , and a first mirror stainless steel plate 213 disposed on a side of the first flat plate 212 close to the annular boss 211 .

[0043] Furthermore, the first flat plate 212 is a square, and of course, it can also be other shapes. The first flat plate 212 and the annular boss 211 are an integrally formed structure. The inner surface of the annular boss 211 is a cylindrical surface.

[0044] like Figure 2 , Figure 5 and Figure 6 As shown, Figure 5 It is a schematic diagram of the three-dimensional structure of the seat plate in one embodiment of the present invention. Figure 6 for Figure 5 A cross-sectional view of the center seat plate is shown.

[0045] In one embodiment, a first flat sliding plate 221 is embedded on one side of the middle seat plate 22 close to the upper seat plate 21 , and the first mirror stainless steel plate 213 and the first flat sliding plate 221 form a planar sliding friction pair.

[0046] Furthermore, one side of the middle seat plate 22 close to the upper seat plate 21 is a circular plane and is provided with a first groove 220. The first flat sliding plate 221 is located in the first groove 220 and contacts the first mirror stainless steel plate 213 to form a planar sliding friction pair. When the friction pendulum support 2 is displaced, the upper seat plate 21 and the middle seat plate 22 will slide relative to each other.

[0047] In one embodiment, a side of the middle base plate 22 facing away from the upper base plate 21 is a first concave spherical surface 222 in which a spherical rotating plate 223 is embedded.

[0048] Furthermore, the first concave spherical surface 222 is provided with a second groove 224 , and the spherical rotating plate 223 is located in the second groove 224 .

[0049] like Figure 2 , Figure 7 and Figure 8 As shown, Figure 7 It is a schematic diagram of the three-dimensional structure of a rotating plate in one embodiment of the present invention. Figure 8 for Figure 7 A cross-sectional view of the rotating plate shown.

[0050] In one embodiment, a side of the rotating plate 23 close to the middle seat plate 22 is a second convex spherical surface 232 , and the spherical rotating plate 223 and the second convex spherical surface 232 form a rotating friction pair.

[0051] In one embodiment, the second convex spherical surface 232 is coated with a second mirror stainless steel plate or a first metal coating, and the second mirror stainless steel plate or the first metal coating forms a rotating friction pair with the spherical rotating plate 223. Of course, other materials can also be used to form a corresponding friction pair.

[0052] In one embodiment, a side of the rotating plate 23 facing away from the middle base plate 22 is a third convex spherical surface 233 , in which a spherical sliding plate 234 is embedded.

[0053] Furthermore, the third convex spherical surface 233 is provided with a third groove, and the spherical sliding plate 234 is located in the third groove 236 .

[0054] In one embodiment, the side wall of the rotating plate 23 extends from a side away from the middle seat plate 22 to a side close to the middle seat plate 22 , and is specifically in a circular ring shape, matching the shape of the annular boss 211 of the upper seat plate 21 .

[0055] like Figure 2 , Fig. 9 and Fig.10 As shown, Fig. 9 FIG. 1 is a schematic diagram of the three-dimensional structure of a sliding plate in one embodiment of the present invention. Fig.10 for Fig. 9 Cross-sectional view of the sliding plate.

[0056] The side of the sliding plate 24 facing away from the rotating plate 23 is square, and the side of the sliding plate 24 close to the rotating plate 23 is a second concave spherical surface 241 . The spherical sliding plate 234 and the second concave spherical surface 241 form a spherical sliding friction pair.

[0057] In one embodiment, the surface of the second concave spherical surface 241 is covered with a third mirror stainless steel plate or a second metal coating, and the third mirror stainless steel plate or the second metal coating forms a rotational friction pair with the spherical sliding plate 234 .

[0058] It should be noted that the friction coefficient of the various friction pairs formed in the present application is within 0.5, and is not limited to materials such as mirror stainless steel plates or metal coatings and sliding plates, but can also be other materials.

[0059] like Fig.11 As shown, Fig.11 It is a schematic diagram of the structure after the friction pendulum support is displaced in one embodiment of the present invention.

[0060] The friction pendulum support provided in this embodiment plays a role in shock absorption and isolation through plane sliding between the upper seat plate 21 and the middle seat plate 22, spherical rotation between the middle seat plate 22 and the rotating plate 23, spherical sliding between the rotating plate 23 and the sliding plate 24, and spherical and cylindrical sliding between the annular boss 211 of the upper seat plate 21 and the first convex spherical surface 231 of the side wall of the rotating plate 23. Changes in the structural shapes of each sliding location do not affect their sliding relationship.

[0061] like Fig.12 As shown, Fig.12 It is a schematic structural diagram of a friction pendulum support in another embodiment of the present invention.

[0062] In one embodiment, the friction pendulum support 2 further includes a baffle plate 25 disposed between the upper seat plate 21 and the sliding plate 24 , which may of course also be a baffle ring.

[0063] The baffle or baffle is used to meet the bridge's requirements for temperature displacement. The baffle or baffle has the function of temporarily restraining the bearing from sliding in a certain direction, so as to achieve sliding caused by the temperature change of the bridge in another direction. Of course, it can also be a multi-directional bearing, that is, no baffle or baffle is set, so as to achieve temperature displacement in any direction.

[0064] like Figure 2 As shown, in a second aspect, an embodiment of the present application further provides a method for calculating the equivalent radius of a friction pendulum bearing, using the above-mentioned friction pendulum bearing 2.

[0065] Equivalent radius Rc The calculation formula is:

[0066]

[0067] Where, J is the variable stiffness coefficient; R z is the radius of the motion trajectory of the contact point between the rotating plate and the upper seat plate; R is the rotation radius; r is the sliding radius; h is the distance from the lowest point to the highest point of the rotating plate.

[0068] like Figure 1 As shown, the equivalent radius R of the existing friction pendulum support 1 e The calculation formula is: e =R+rh;

[0069] Wherein, R is the rotation radius; r is the sliding radius; and h is the distance from the lowest point to the highest point of the second seat plate.

[0070] Combining the calculation formulas for the equivalent radius of the existing friction pendulum bearing 1 and the friction pendulum bearing 2 provided in this application, based on the structures of different friction pendulum bearings, the equivalent radius is a key parameter and is the key to reducing the bearing height. Therefore, this application provides a calculation method for the equivalent radius of the existing friction pendulum bearing that is different from that of the existing friction pendulum bearing.

[0071] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0072] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0073] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0074] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A friction pendulum support, characterized in that: The friction pendulum support (2) comprises an upper seat plate (21), a middle seat plate (22), a rotating plate (23), and a sliding plate (24) which are arranged in sequence from top to bottom. The upper seat plate (21) has an annular boss (211). The side wall of the rotating plate (23) is a first convex spherical surface (231). The inner surface of the annular boss (211) contacts the first convex spherical surface (231), so that when the friction pendulum support (2) is displaced, the inner surface of the annular boss (211) and the first convex spherical surface (231) slide relative to each other.

2. The friction pendulum support according to claim 1, characterized in that: The upper seat plate (21) also includes a first flat plate (212) covering the annular boss (211), and a first mirror stainless steel plate (213) arranged on the side of the first flat plate (212) close to the annular boss (211), and a first flat sliding plate (221) is embedded on the side of the middle seat plate (22) close to the upper seat plate (21), and the first mirror stainless steel plate (213) and the first flat sliding plate (221) form a planar sliding friction pair.

3. The friction pendulum support according to claim 1, characterized in that: The side of the middle seat plate (22) facing away from the upper seat plate (21) is a first concave spherical surface (222) in which a spherical rotating plate (223) is embedded.

4. The friction pendulum support according to claim 3, characterized in that: A side of the rotating plate (23) close to the middle seat plate (22) is a second convex spherical surface (232), and the spherical rotating plate (223) and the second convex spherical surface (232) form a rotating friction pair.

5. The friction pendulum support according to claim 4, characterized in that: The surface of the second convex spherical surface (232) is covered with a second mirror stainless steel plate or a first metal coating, and the second mirror stainless steel plate or the first metal coating and the spherical rotating plate (223) form the rotating friction pair.

6. The friction pendulum support according to claim 1, characterized in that: The side of the rotating plate (23) facing away from the middle seat plate (22) is a third convex spherical surface (233) embedded with a spherical sliding plate (234); the side of the sliding plate (24) close to the rotating plate (23) is a second concave spherical surface (241); the spherical sliding plate (234) and the second concave spherical surface (241) form a spherical sliding friction pair.

7. The friction pendulum support according to claim 6, characterized in that: The surface of the second concave spherical surface (241) is covered with a third mirror stainless steel plate or a second metal coating, and the third mirror stainless steel plate or the second metal coating and the spherical sliding plate (234) form the rotating friction pair.

8. The friction pendulum support according to claim 1, characterized in that: The side wall of the rotating plate (23) is formed by extending from a side thereof away from the middle seat plate (22) to a side thereof close to the middle seat plate (22).

9. The friction pendulum support according to claim 1, characterized in that: The friction pendulum support (2) further comprises a retaining ring or a retaining plate (25) arranged between the upper seat plate (21) and the sliding plate (24).

10. A method for calculating the equivalent radius of a friction pendulum support, characterized in that: Using the friction pendulum support (2) as described in any one of claims 1 to 9, Equivalent radius R c The calculation formula is: Among them, R z is the radius of the motion trajectory of the contact point between the rotating plate and the upper seat plate; R is the rotation radius; r is the sliding radius; h is the distance from the lowest point to the highest point of the rotating plate.

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