Adjustable variable stiffness limiting damping device

Abstract

The invention relates to an adjustable variable-rigidity limiting damping device, and belongs to the technical field of bridge construction. Comprising an upper connecting seat plate, a lower connecting seat plate and a limiting damper assembly, and the limiting damper assembly comprises a damper plunger, a damper cover plate, a damper cylinder body, a variable stiffness damping spring and a disc spring. The abutment and the beam body are connected into a whole in the connecting mode. The limiting damper is used for restraining movement of the beam body in the bridge direction, providing longitudinal displacement limitation between the beam body and the abutment and dissipating vibration energy. The device has two operating states with different rigidities, and can meet the requirements under different seismic intensities. Specifically, under the action of different horizontal forces, the device can generate different displacement responses. Meanwhile, by integrating two different damping media, a double energy consumption mechanism is achieved, and the short-distance damping effect is provided under the normal use working condition (small displacement); when an earthquake occurs, the damping effect can be remarkably enhanced under long-distance displacement.

Description

TECHNICAL FIELD

[0001] The present application relates to a variable stiffness limiting damping device, belonging to the technical field of bridge construction. BACKGROUND

[0002] With the vigorous development of China's transportation infrastructure industry, various types of bridges are emerging, most of which are long-span, large-mass complex structures. In daily operation, bridges are constantly subjected to various loads, resulting in significant vibrations. When an earthquake occurs, strong ground motion will be transmitted to the bridge through the foundation, causing severe vibration of the whole structure. The frequency and amplitude of this vibration are often large, and the key parts of the bridge, such as the beam body and piers, will bear a huge impact force. In strong wind weather, the airflow interacts with the bridge structure, which may produce phenomena such as flutter and vortex vibration, causing the bridge to sway continuously under the continuous action of wind force, especially for long-span suspension bridges and cable-stayed bridges, the vibration is more obvious. Vehicle load is one of the regular loads that bridges bear. When a large number of vehicles of different weights and driving speeds pass through the bridge deck, they will produce periodic impact and vibration on the bridge. Although the individual force of the pedestrian load is small, when the number of pedestrians on the bridge is large and the walking rhythm tends to be consistent, it will also form a superimposed vibration effect. These vibrations contain a huge amount of kinetic energy, and if not effectively controlled, the consequences will be disastrous. First, it may cause cracks, deformation, and other damage to the bridge structure, and in severe cases, it may even cause the whole structure to collapse, posing a great threat to life and property safety. Second, long-term vibration will cause fatigue damage to bridge components under alternating stress, shortening the service life of the bridge. Third, vibration will reduce the comfort of driving and walking, and vehicles may experience bumps when driving, and pedestrians may feel uncomfortable. In addition, the auxiliary facilities on the bridge, such as guardrails, lighting equipment, expansion joints, etc., will also loosen and damage due to continuous vibration, increasing maintenance costs and safety hazards. SUMMARY

[0003] In view of the above defects in the prior art, the present application proposes a variable stiffness limiting damping device to solve the problems of bridge vibration, energy dissipation, and improve the service life of the bridge.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows: The camshaft is connected to the camshaft via a spring which is fixed to the camshaft at the bottom of the camshaft, and the camshaft is connected to the camshaft via a spring which is fixed to the camshaft at the bottom of the camshaft.

[0005] Furthermore, the disc spring is arranged between the plug end plate and the variable stiffness damping spring, that is, one side of the disc spring is in contact with the plug end plate, and the other side is in contact with the variable stiffness damping spring.

[0006] Furthermore, the plug end plate is initially placed in the middle position of the damper cylinder.

[0007] Furthermore, the plunger end plate is slidably arranged with respect to the side wall of the damper cylinder, and the plunger end plate is vertically connected to the damper plunger.

[0008] Furthermore, the damper cover plate and the end of the damper cylinder are fixed together by bolts.

[0009] Furthermore, the upper connecting seat plate is connected to the ear plate interface of the damper plug through a pin shaft; the upper connecting seat plate is installed on the bottom of the bridge beam and is welded or bolted to the bottom of the bridge beam; the lower connecting seat plate is connected to the ear plate of the damper cylinder through a pin shaft; the lower connecting seat plate is connected to the embedded component embedded in the pier column through bolts.

[0010] Furthermore, the upper connecting seat plate is welded to the bottom steel plate of the bridge beam, or the upper connecting seat plate is directly bolted to the concrete of the bottom of the bridge beam through embedded components.

[0011] Furthermore, the damper plug, the damper cover, the damper cylinder, the variable stiffness damping spring, and the disc spring are integrally assembled.

[0012] Furthermore, the variable stiffness damping spring is composed of two damping materials, including polyurethane and rubber, which are connected in series.

[0013] Furthermore, the embedded components are fixed to the pier column concrete by embedding.

[0014] After adopting the above technical solution, the present invention has at least one of the following beneficial effects compared with the prior art: The limit damping device of the present invention provides a bridge with a variable stiffness limit damper, which can adapt to various displacement requirements of the bridge, suppress wind-induced vibrations, reduce earthquake vibrations, significantly reduce the vibration amplitude of the bridge, consume dissipated energy, ensure driving safety and comfort, and improve the service life of the bridge.

[0015] The present invention connects the pier and the beam into one body through the above-mentioned connection method. The limit damper is used to constrain the movement of the beam in the longitudinal direction of the bridge, provide longitudinal displacement limitation between the beam and the pier, and dissipate vibration energy. The core feature of this device lies in its adjustable stiffness characteristics: it has two operating states with different stiffnesses and can adapt to the needs under different earthquake intensities. Specifically, under the action of different horizontal forces, the device will produce different displacement responses. At the same time, the device realizes a dual energy dissipation mechanism by integrating two different damping media: it provides a short-distance damping effect under normal use conditions (small displacement); when encountering an earthquake, it can significantly enhance the shock absorption and damping effect under long-distance displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the implementation cases of the present invention, the following is a brief introduction to the drawings required for use in the implementation cases of the present invention or the description of the prior art. The drawings described below are only some implementation cases of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of a bridge limit damping device according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the arrangement of the variable stiffness damping spring in an embodiment of the present invention.

[0018] Figure 3 The variable stiffness damping spring of the embodiment of the present invention is Figure 1 . DETAILED DESCRIPTION

[0019] The following description provides many different implementations or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are not intended to simplify the present invention and are only examples and are not intended to limit the present invention.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is multiple or more, unless otherwise clearly and specifically defined.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical, electrical, or intercommunication connections; direct or indirect connections through an intermediary; and may encompass internal connectivity between multiple components or interactions between multiple components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0022] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or diagonally below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Implementation Case 1 like Figure 1As shown, this embodiment provides an adjustable variable stiffness limit damping device, including an upper connecting seat plate 01, a lower connecting seat plate 05 and a limit damper assembly connected therebetween, the limit damper assembly including a damper plug 02, a damper cover 03, a damper cylinder 04, a variable stiffness damping spring 07, and a disc spring 08, and the damper plug 02, the damper cover 03, the damper cylinder 04, the variable stiffness damping spring 07, and the disc spring 08 are assembled as a whole.

[0025] like Figure 1 As shown, damper cylinder 04 is concave in shape, with an ear plate extending from the bottom plate at one end and connected to the lower connecting seat plate 05, and the other end fixed to the damper cover plate 03. Damper plunger 02 is connected to the upper connecting seat plate 01 at one end, and the other end passes through the damper cover plate 03 and extends into the interior of damper cylinder 04, connecting to the plunger end plate 09 in the middle of damper cylinder 04. Plug end plate 09 is initially positioned in the middle of damper cylinder 04 and slides against the side wall of damper cylinder 04. Plug end plate 09 is vertically connected to damper plunger 02.

[0026] like Figure 1-3 As shown, screw rods 10 are provided on both sides of the plunger end plate 09. One end of the screw rods 10 is threadedly fixed to both sides of the plunger end plate 09, and the other end extends out of the holes in the damper cover plate 03 and the bottom plate of the damper cylinder 04. The screw rods 10 are connected in series with a variable stiffness damping spring 07 and a disc spring 08.

[0027] like Figure 3 As shown, the disc spring 08 is arranged between the plunger end plate 09 and the variable stiffness damping spring 07, that is, one side of the disc spring 08 is in contact with the plunger end plate 09, and the other side is in contact with the variable stiffness damping spring 07. The variable stiffness damping spring 7 is composed of two damping materials, including polyurethane and rubber, which are connected in series on the left and right sides.

[0028] In this embodiment, the damper plug 02 can be removed and replaced with the variable stiffness damping spring 07. Alternatively, the variable stiffness damping spring 07 can be connected to the damper plug 02 in other ways. Alternatively, the variable stiffness damping spring 07 can be specially designed according to the needs of the bridge.

[0029] like Figure 1 As shown, in this embodiment, the damper cover plate 03 is fixed together with the end of the damper cylinder 04 by bolts. The damper cover plate 03 and the damper cylinder 04 are connected by a connecting platform, which can provide a shear force offset to prevent the bolts from being sheared due to excessive shear force.

[0030] like Figure 1As shown, in this embodiment, the upper connecting plate 01 is connected to the lug interface of the damper plug 02 via a pin. The upper connecting plate 01 is mounted on the bottom of the bridge beam and welded to the bottom steel plate 11 of the bridge beam. The lower connecting plate 05 is connected to the lug of the damper cylinder 04 via a pin. The lower connecting plate 05 is bolted to the embedded component 06 embedded in the pier 12. The embedded component 06 is fixed to the concrete of the pier 12 by means of a pre-embedded method.

[0031] Example 2 In this embodiment, the upper connecting seat plate 01 is directly bolted to the concrete at the bottom of the bridge beam through the embedded component 06. Other structural components and connection methods are the same as those in embodiment 1 and will not be described in detail here.

[0032] The above is merely a preferred embodiment of the present invention and does not constitute any formal limitation on the structure of the present invention. The layout and number of the present invention are not limited to this example and can be optimized according to actual engineering practices. Any modifications, equivalent changes, and decorations to the above embodiment based on the technical principles of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A variable stiffness limit damping device, comprising an upper connecting seat plate (01), a lower connecting seat plate (05), and a limit damper assembly connected therebetween, characterized in that: The limit damper assembly comprises a damper plunger (02), a damper cover (03), a damper cylinder (04), a variable stiffness damping spring (07), and a disc spring (08); the damper cylinder (04) is concave in shape, with an ear plate extending from the bottom plate at one end and connected to the lower connecting seat plate (05), and the damper cover (03) fixed at the other end; one end of the damper plunger (02) is connected to the upper connecting seat plate (01), and the other end passes through the damper cover ( 03) and extends into the interior of the damper cylinder (04) and is connected to the plug end plate (09) in the middle of the damper cylinder (04); screws (10) are respectively provided on both sides of the plug end plate (09), one end of the screw (10) is threadedly fixed on both sides of the plug end plate (09), and the other end extends out of the holes of the damper cover plate (03) and the bottom plate of the damper cylinder (04); a variable stiffness damping spring (07) and a disc spring (08) are connected in series on the screw (10).

2. The adjustable stiffness limit damping device according to claim 1, characterized in that: The disc spring (08) is arranged between the plug end plate (09) and the variable stiffness damping spring (07), that is, one side of the disc spring (08) is in contact with the plug end plate (09), and the other side is in contact with the variable stiffness damping spring (07).

3. The adjustable stiffness limit damping device according to claim 1, characterized in that: The plug end plate (09) is initially placed in the middle of the damper cylinder (04).

4. The adjustable stiffness limit damping device according to claim 1, characterized in that: The plunger end plate (09) is slidably arranged on the side wall of the damper cylinder (04), and the plunger end plate (09) is vertically connected to the damper plunger (02).

5. The adjustable stiffness limit damping device according to claim 1, characterized in that: The damper cover plate (03) and the end of the damper cylinder (04) are fixed together by bolts.

6. The adjustable stiffness limit damping device according to claim 1, characterized in that: The upper connecting seat plate (01) is connected to the ear plate interface of the damper plug (02) via a pin shaft; the upper connecting seat plate (01) is installed on the bottom of the bridge beam and is welded or bolted to the bottom of the bridge beam; the lower connecting seat plate (05) is connected to the ear plate of the damper cylinder (04) via a pin shaft; the lower connecting seat plate (05) is connected to the embedded component (06) embedded in the pier column (12) via bolts.

7. The adjustable stiffness limit damping device according to claim 6, characterized in that: The upper connecting seat plate (01) is welded to the bottom steel plate (11) of the bridge beam, or the upper connecting seat plate (01) is directly bolted to the concrete of the bridge beam bottom via the embedded component (06).

8. The adjustable stiffness limit damping device according to claim 1, characterized in that: The damper plug (02), the damper cover plate (03), the damper cylinder (04), the variable stiffness damping spring (07), and the disc spring (08) are integrally assembled.

9. The adjustable stiffness limit damping device according to claim 1, characterized in that: The variable stiffness damping spring (7) is composed of two damping materials, including polyurethane and rubber, which are connected in series.

10. The adjustable stiffness limit damping device according to claim 6, characterized in that: The embedded component (06) is fixed to the concrete of the pier column (12) by embedding.

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