Friction pendulum shock insulation support

Abstract

The utility model relates to the technical field of structural seismic resistance, and provides a friction pendulum seismic isolation support which comprises a lower support plate, an upper support plate and a lower support plate. The bottom of the sliding block is provided with a convex spherical surface, the top of the sliding block is provided with a plane, the convex spherical surface is matched with the concave spherical surface, the bottom of the sliding block is arranged in the concave spherical surface, and the concave spherical surface and the convex spherical surface form a first friction pair; the bottom of the upper support plate is provided with a plane, the upper support plate covers the top of the sliding block, and the plane of the bottom of the upper support plate and the plane of the top of the sliding block form a second friction pair; a limiting part is further arranged at the bottom of the upper support plate, and the limiting part is arranged around the plane of the bottom of the upper support plate; the friction coefficient of the first friction pair is larger than that of the second friction pair, so that the second friction pair slides earlier than the first friction pair all the time. Release of temperature stress and shrinkage creep stress of an upper structure under the normal use condition of a bridge can be met, and the requirements for prolonging the period of the bridge structure, dissipating earthquake energy and reducing the earthquake response of the bridge structure under the earthquake action can also be met.

Description

Technical Field

[0001] The present application relates to the technical field of structural seismic resistance, and in particular to a friction pendulum seismic isolation bearing. Background Art

[0002] Seismic design is gaining increasing attention during bridge structural design, and seismic isolation bearings, as key components of bridge seismic design, are increasingly favored by bridge designers. These bearings must not only transmit vertical loads under normal bridge operation, adapt to the rotation and displacement of the superstructure under loads such as temperature and vehicle traffic, but also extend the bridge's structural period during earthquakes, dissipate seismic energy, and minimize the bridge's seismic response.

[0003] Currently, friction-type seismic isolation bearings, which are widely used in bridge structure seismic design, are often designed with a single friction coefficient. When the friction coefficient is low, the friction force under earthquake action is small, and the ability to dissipate seismic energy is limited. At the same time, the superstructure may produce a large displacement response, causing earthquake disasters such as beam fall. When the friction coefficient is high, the superstructure's temperature stress and concrete shrinkage creep stress cannot be released under normal use, causing secondary internal forces and affecting the durability of the bridge structure. Furthermore, friction pendulum bearings and hyperboloid bearings with spherical crown or cylindrical friction surfaces can cause the superstructure to lift when subjected to temperature deformation and shrinkage creep deformation, similarly affecting the durability of the bridge structure. Utility Model Content

[0004] In order to solve the above problems, the present application provides a friction pendulum isolation bearing with an ingenious design and simple structure. The present application can not only meet the requirements of releasing the temperature stress and shrinkage creep stress of the superstructure under normal use of the bridge, but also meet the requirements of extending the bridge structure period, dissipating seismic energy, and reducing the seismic response of the bridge structure under earthquake action. The technical solutions adopted in the present application are as follows:

[0005] A friction pendulum isolation support, comprising:

[0006] The top of the lower support plate is provided with a concave spherical surface; the slider, the bottom of the slider is provided with a convex spherical surface, and the top is provided with a flat surface, the convex spherical surface is adapted to the concave spherical surface, the bottom of the slider is in the concave spherical surface, and the concave spherical surface and the convex spherical surface form a first friction pair; the upper support plate, the bottom of the upper support plate is provided with a flat surface, the upper support plate covers the top of the slider, and the flat surface of the bottom of the upper support plate and the flat surface of the top of the slider form a second friction pair; the bottom of the upper support plate is also provided with a limiting part, the limiting part is arranged around the flat surface of the bottom of the upper support plate, and the limiting part is used to limit the relative sliding distance between the upper support plate and the slider; the friction coefficient of the first friction pair is greater than the friction coefficient of the second friction pair, so that the second friction pair always slides before the first friction pair.

[0007] By designing the friction coefficient of the first friction pair to be greater than that of the second friction pair, the second friction pair always slides before the first. This means that during normal bridge operation, the thermal and shrinkage creep stresses of the bridge superstructure are released through the relative sliding of the second friction pair, while the relative sliding of the first friction pair is not activated. However, the first friction pair only comes into play during an earthquake, extending the structural lifespan of the bridge while dissipating a significant amount of seismic energy and reducing the seismic response of the bridge structure. Furthermore, the second friction pair, formed by the flat surface at the bottom of the upper bearing plate and the flat surface at the top of the slider, does not cause the bridge superstructure to lift during relative sliding, thus preventing the adverse effects of such lifting on bridge durability. Notably, the first friction pair, formed by the mating of a concave spherical surface and a convex spherical surface, slides relative to the upper bearing plate during an earthquake, extending the structural lifespan and dissipating seismic energy. Once the earthquake subsides, the slider self-resets under the weight of the bridge superstructure. In addition, by providing a limiting portion, the sliding distance of the upper support plate relative to the slider can be limited, thereby avoiding failure of the entire support due to the upper support plate being separated from the slider.

[0008] In some embodiments, the friction coefficient of the first friction pair is 0.04-0.06, and the friction coefficient of the second friction pair is 0.02-0.04.

[0009] In some embodiments, the friction coefficient of the first friction pair is 0.05, and the friction coefficient of the second friction pair is 0.03.

[0010] In some embodiments, a buffer is provided on a side of the limiting portion close to the slider.

[0011] By providing a buffer, the collision effect between the slider and the limiting portion can be reduced, thereby reducing the risk of damage to the support.

[0012] In some embodiments, the convex spherical surface at the bottom of the slider and the flat surface at the top of the slider are both made of polytetrafluoroethylene.

[0013] In some embodiments, the friction pendulum isolation support further includes a dust cover, and the dust cover is provided on the periphery of the slider and the limiting portion.

[0014] By providing a dust cover, the risk of dust, rainwater and other debris entering the support can be reduced, the adverse effects of debris on the first friction pair and the second friction pair can be reduced, and the service life of the support can be extended.

[0015] In some embodiments, the friction pendulum isolation bearing further includes a locking structure, wherein the locking structure is used to limit the relative displacement between the lower bearing plate and the upper bearing plate.

[0016] By providing a locking structure, the integrity of the support during handling and transportation can be ensured, and the separation of the various components of the support during handling and transportation can be avoided.

[0017] The friction pendulum isolation bearing provided in this application has at least one of the following beneficial effects:

[0018] 1. This application provides a friction pendulum isolation bearing. By designing the friction coefficient of the first friction pair to be greater than that of the second friction pair, the second friction pair always slides before the first friction pair. This means that during normal bridge operation, the release of thermal stress and shrinkage creep stress in the bridge superstructure is achieved through the relative sliding of the second friction pair, while the relative sliding of the first friction pair is not activated. The first friction pair only comes into play during an earthquake, extending the structural period of the bridge while dissipating a significant amount of seismic energy and reducing the seismic response of the bridge structure. Furthermore, the second friction pair is formed by the flat surface at the bottom of the upper bearing plate and the flat surface at the top of the slider. This relative sliding of the second friction pair does not cause the bridge superstructure to lift, thus avoiding the adverse effects of such lifting on the bridge's durability. Notably, the first friction pair is formed by the concave and convex spherical surfaces. During an earthquake, the first friction pair slides relative to the upper bearing plate, extending the structural period and dissipating seismic energy. After the earthquake ceases, the slider self-resets under the weight of the bridge superstructure. In addition, by providing a limiting portion, the sliding distance of the upper support plate relative to the slider can be limited, thereby avoiding failure of the entire support due to the upper support plate being separated from the slider.

[0019] 2. The friction pendulum isolation bearing provided in the present application can reduce the collision effect between the slider and the limit part and reduce the risk of bearing damage by providing a buffer.

[0020] 3. The friction pendulum isolation bearing provided in this application can reduce the risk of dust, rainwater and other debris entering the bearing by providing a dust cover, reduce the adverse effects of debris on the first friction pair and the second friction pair, and extend the service life of the bearing.

[0021] 4. The friction pendulum isolation bearing provided in this application can ensure the integrity of the bearing during handling and transportation by providing a locking structure, thereby preventing the various components of the bearing from separating during handling and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following will explain the preferred embodiment in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of a friction pendulum isolation bearing:

[0023] Figure 1 It is a half-section view of the support of the present application;

[0024] Figure 2 is a top view of the support plate of this application;

[0025] Figure 3 It is a bottom view of the upper support plate of this application.

[0026] Description of Figure Numbers:

[0027] Lower support plate 1, concave spherical surface 2, slider 3, first friction pair 4, upper support plate 5, second friction pair 6, limit part 7, buffer part 8. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0029] To simplify the drawings, only the parts relevant to this application are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0030] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] refer to Figure 1-Figure 3 The present application provides a friction pendulum seismic isolation bearing, comprising: a lower bearing plate 1, a slider 3 and an upper bearing plate 5; a concave spherical surface 2 is provided on the top of the lower bearing plate 1; a convex spherical surface is provided at the bottom of the slider 3, and a plane is provided on the top, the convex spherical surface is adapted to the concave spherical surface 2, the bottom of the slider 3 is in the concave spherical surface 2, and the concave spherical surface 2 and the convex spherical surface form a first friction pair 4; a plane is provided at the bottom of the upper bearing plate 5, the upper bearing plate 5 covers the top of the slider 3, and the plane at the bottom of the upper bearing plate 5 and the plane at the top of the slider 3 form a second friction pair 6; a limit portion 7 is also provided at the bottom of the upper bearing plate 5, the limit portion 7 is arranged around the plane at the bottom of the upper bearing plate 5, and the limit portion 7 is used to limit the relative sliding distance between the upper bearing plate 5 and the slider 3; the friction coefficient of the first friction pair 4 is greater than the friction coefficient of the second friction pair 6, so that the second friction pair 6 always slides before the first friction pair 4.

[0034] Specifically, in one embodiment, the convex spherical surface at the bottom and the flat surface at the top of the slider 3 are both made of a low-friction material, while the bottom flat surface of the upper support plate 5 and the concave spherical surface 2 at the top of the lower support plate 1 are not provided with a low-friction material. The low-friction material may be polytetrafluoroethylene, modified polytetrafluoroethylene, or modified ultra-high molecular weight polyethylene. The convex spherical surface at the bottom of the slider 3 can be formed by attaching a plate made of a low-friction material to the bottom of the slider 3 body, while the flat surface at the top of the slider 3 can be formed by attaching a plate made of a low-friction material to the top of the slider 3 body. It is understood that in other embodiments, the bottom plane of the upper support plate 5 and the concave spherical surface 2 on the top of the lower support plate 1 are both made of low-friction materials, while the convex spherical surface on the bottom and the flat surface on the top of the slider 3 are not provided with low-friction materials; alternatively, the bottom plane of the upper support plate 5 and the concave spherical surface 2 on the top of the lower support plate 1 are both made of low-friction materials, and the convex spherical surface on the bottom and the flat surface on the top of the slider 3 are also made of low-friction materials; alternatively, one of the surfaces of the first friction pair 4 is made of low-friction materials, and one of the surfaces of the second friction pair 6 is also made of low-friction materials. Typically, the main bodies of the upper support plate 5, the lower support plate 1, and the slider 3 are all made of steel.

[0035] Notably, by designing the friction coefficient of the first friction pair 4 to be greater than that of the second friction pair 6, the second friction pair 6 always slides before the first friction pair 4. This means that during normal bridge operation, the thermal stress and shrinkage creep stress of the bridge superstructure are released through the relative sliding of the second friction pair 6, while the relative sliding of the first friction pair 4 is not activated. However, the first friction pair 4 only comes into play during an earthquake, extending the structural lifespan of the bridge while dissipating a significant amount of seismic energy and reducing the seismic response of the bridge structure. Furthermore, the second friction pair 6 is formed by the flat surface at the bottom of the upper bearing plate 5 and the flat surface at the top of the slider 3. This relative sliding of the second friction pair 6 does not cause the bridge superstructure to lift, thus preventing the adverse effects of such lifting on the bridge's durability. Notably, the first friction pair 4 is formed by the concave spherical surface 2 and the convex spherical surface. During an earthquake, the first friction pair 4 slides relative to the upper bearing plate 5, extending the structural lifespan and dissipating seismic energy. Once the earthquake subsides, the slider 3 can self-reset under the weight of the bridge superstructure.

[0036] It is easy to understand that by providing the limiter 7, the sliding distance of the upper support plate 5 relative to the slider 3 can be limited, thereby preventing the entire support from failing due to the upper support plate 5 separating from the slider 3. Specifically, a gap of a certain width is reserved between the limiter 7 and the slider 3. This not only meets the requirements of temperature deformation and shrinkage creep of the bridge superstructure without constraining the deformation of the bridge superstructure, but also meets the requirements of limiting the displacement of the superstructure under earthquake action. Under the action of an earthquake, the second friction pair 6 preferentially slides relative to the other. When the slider 3 contacts the limiter 7, it can no longer slide in the original sliding direction, which will cause the first friction pair 4 to slide relative to the other.

[0037] In one embodiment, the friction coefficient of the first friction pair 4 is 0.04-0.06, and the friction coefficient of the second friction pair 6 is 0.02-0.04. Preferably, the friction coefficient of the first friction pair 4 is 0.05, and the friction coefficient of the second friction pair 6 is 0.03.

[0038] It is worth noting that the reference Figure 1 、 Figure 3 In one embodiment, a buffer member 8 is provided on the side of the limiting portion 7 close to the slider 3.

[0039] Specifically, the limiting portion 7 is an annular boss, integrally formed with the upper support plate 5, and the buffer member 8 is also annular. The buffer member 8 can be embedded or bonded inside the limiting portion 7. It is understood that the buffer member 8 is preferably made of rubber.

[0040] In one embodiment, the friction pendulum isolation bearing further includes a dust cover, which is provided around the slider 3 and the outer periphery of the stopper 7. It is readily understood that the provision of the dust cover reduces the risk of debris such as dust and rainwater entering the bearing, thereby reducing the adverse effects of debris on the first friction pair 4 and the second friction pair 6, and extending the bearing's service life.

[0041] In one embodiment, the friction pendulum isolation bearing further includes a locking structure, which is used to limit the relative displacement between the lower bearing plate 1 and the upper bearing plate 5 .

[0042] It is worth noting that by providing a locking structure, the integrity of the support during handling and transportation can be ensured, and the separation of the various components of the support during handling and transportation can be avoided.

[0043] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be noted that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be considered as the scope of protection of the present application.

Claims

1. A friction pendulum isolation support, characterized in that: include: A lower support plate, wherein the top of the lower support plate is provided with a concave spherical surface; A slider, wherein the bottom of the slider is provided with a convex spherical surface and the top is provided with a flat surface, the convex spherical surface is adapted to the concave spherical surface, the bottom of the slider is located in the concave spherical surface, and the concave spherical surface and the convex spherical surface form a first friction pair; An upper support plate, wherein a flat surface is provided at the bottom of the upper support plate, the upper support plate covers the top of the slider, and the flat surface of the bottom of the upper support plate and the flat surface of the top of the slider form a second friction pair; a limiting portion is further provided at the bottom of the upper support plate, the limiting portion being arranged around the flat surface of the bottom of the upper support plate, and the limiting portion is used to limit the relative sliding distance between the upper support plate and the slider; The friction coefficient of the first friction pair is greater than the friction coefficient of the second friction pair, so that the second friction pair always slides before the first friction pair.

2. The friction pendulum isolation support according to claim 1, characterized in that: The friction coefficient of the first friction pair is 0.04-0.06, and the friction coefficient of the second friction pair is 0.02-0.

04.

3. The friction pendulum isolation support according to claim 2, characterized in that: The friction coefficient of the first friction pair is 0.05, and the friction coefficient of the second friction pair is 0.

03.

4. The friction pendulum isolation support according to claim 1, characterized in that: A buffer is provided on one side of the limiting portion close to the sliding block.

5. The friction pendulum isolation support according to claim 1, characterized in that: The convex spherical surface at the bottom of the slider and the flat surface at the top of the slider are both made of polytetrafluoroethylene.

6. The friction pendulum isolation support according to claim 1, characterized in that: It also includes a dust cover, which is arranged on the outer periphery of the slider and the limiting portion.

7. The friction pendulum isolation support according to claim 1, characterized in that: It also includes a locking structure, which is used to limit the relative displacement between the lower support plate and the upper support plate.

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