Damper shock absorption amplification device for bridge

Abstract

The utility model relates to a bridge damper shock absorption amplification device belongs to damper shock absorption amplification device technical field, the amplification device sets up between pier column and beam body, including one end with pier column fixed connection, the other end along the trend of beam body extension horizontal support plate, the bottom of horizontal support plate be connected with pier column through the oblique support rod, set up seesaw device on horizontal support plate upper end, the board body both ends of seesaw device are connected with horizontal support plate through first damper and second damper respectively, the board body both ends of seesaw device are connected with beam body bottom through flexible cable respectively, and 2 flexible cables are set up mutually crossing. The utility model can significantly promote the energy dissipation of damper shock absorption effect, to further promote the anti-seismic performance of bridge structure. Compared with the prior amplification device, the utility model has the characteristics of small component section, less space occupation and large amplification coefficient.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of damper shock absorption amplification device, and particularly relates to a damper shock absorption amplification device for bridges. BACKGROUND

[0002] Earthquake is a natural disaster, which is difficult to predict and has strong destructive power. As a traffic hub, the seismic performance of a bridge is crucial. In recent years, domestic and foreign scholars have conducted a lot of research on bridge shock absorption technology and have achieved certain results. As an effective seismic measure, the shock absorption amplification device can play a certain role in improving the seismic performance of bridge engineering. In the 1970s, the United States first carried out research on bridge shock absorption technology. Subsequently, Japan, Italy, New Zealand and other countries also successively carried out related research. Foreign scholars have conducted a lot of theoretical analysis and experimental research on the shock absorption amplification device and have achieved fruitful results. The research on bridge shock absorption technology in China began in the 1980s. In recent years, with the attention of the state to infrastructure construction, bridge shock absorption technology has developed rapidly. Domestic scholars have made remarkable achievements in shock absorption amplification devices. At present, the shock absorption devices that have been successfully applied to practical engineering at home and abroad include friction pendulum bearings, lead rubber bearings, high-damping rubber bearings and the like. At present, the amplification device is rarely used when the above-mentioned shock absorption devices are applied in China. Even if a viscous damper or the like is arranged near the bearing, an amplification device is generally not arranged. Although researchers at home and abroad have studied amplification devices, many amplification devices have excessively large component cross-sectional sizes or occupy a large space in the form of amplification, which is not conducive to application in actual bridge engineering. SUMMARY

[0003] In order to further improve the shock absorption effect of the damper, the application provides a damper shock absorption amplification device for a bridge, and a calculation formula of an amplification coefficient is given. The amplification device can significantly improve the energy dissipation and shock absorption effect of the damper, thereby further improving the seismic performance of the bridge structure. Compared with existing amplification devices, the application has the characteristics of small component cross section, less space occupation and large amplification coefficient.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] A damper shock absorption amplification device for a bridge, the amplification device is arranged between a pier column and a beam body, and comprises a horizontal support plate fixedly connected to one end of the pier column and extending along the running direction of the beam body, the bottom of the horizontal support plate is connected to the pier column through a diagonal supporting rod, a seesaw device is arranged at the upper end of the horizontal support plate, the plate body of the seesaw device is connected to the horizontal support plate through a first damper and a second damper at both ends respectively, the plate body of the seesaw device is connected to the bottom of the beam body through two flexible cables at both ends respectively, and the two flexible cables are arranged in a crisscross manner.

[0006] Preferably, the first damper is a viscoelastic damper, the top end of which is connected to the end of the flexible cable, and the bottom end is fixedly connected to the top end of the horizontal support plate.

[0007] Preferably, the second damper is a torsional damper, which includes two steel plates arranged along the beam direction, the two steel plates being arranged opposite each other, and multiple low-yield-point metal tubes arranged horizontally and perpendicularly to the beam direction being connected between the two steel plates, and a connecting plate connecting the multiple low-yield-point metal tubes, one end of the connecting plate being connected to the end of the flexible cable, and the bottom end of the steel plate being fixedly connected to the top end of the horizontal support plate.

[0008] A method for calculating the amplification factor of a damper vibration reduction amplification device for bridges includes the following steps:

[0009] (1) Determine the expressions for Δx and Δy as shown in equations (1) and (2).

[0010]

[0011] In equations (1) and (2), Δx refers to the horizontal deformation at point B; Δy refers to the vertical deformation at point B, where point B represents the end point of the seesaw device; δ BC The axial deformation of the cable is represented by δ, and the horizontal deformation of the beam is represented by δ. The lengths of the cable before deformation are AB and BC, and the length of the cable after deformation is... The angle between the seesaw device's plate and the horizontal plane is β. When it is not deformed, the angle between one of the flexible cables and the horizontal plane is α. After deformation, the angle between the seesaw device's plate and the horizontal plane is θ1. The angle between the flexible cable 7 after deformation and before deformation is θ2. Force represents the horizontal seismic force on the beam, and h represents the height of the seesaw device's plate end.

[0012] When θ1 and θ2 are relatively small, equations (1) and (2) simplify as follows:

[0013]

[0014] Based on the definition of the amplified displacement of the damper, the expression for the amplified displacement of the damper is as follows:

[0015]

[0016] Substitute equations (3) and (4) into equation (5) to determine the displacement amplification value of one side damper;

[0017] The displacement amplification factor of the damper is determined according to equation (5) as shown in equation (6):

[0018]

[0019] Since the angle of β is relatively small in engineering practice, Δx is determined to be relatively small compared to Δy. When the influence of Δx is ignored, equation (6) simplifies to equation (7):

[0020]

[0021] Substituting equation (4) into equation (7), and simplifying, we obtain the final amplification factor, as shown in equation (8):

[0022]

[0023] Equation (8) is only the amplification factor for one side. Considering both sides, the amplification factor of the entire damping system is shown in Equation (9):

[0024]

[0025] The beneficial effects of the damper vibration reduction and amplification device for bridges of the present invention are as follows:

[0026] While seismic isolation bearings and other energy dissipation and damping devices can play a certain role in bridge structures, with the continuous development of bridge structures, the horizontal deformation of the beams in multi-span bridges is limited by improper structural measures or other constraints, resulting in less than ideal damping effects from these devices. To enable dampers to exert a greater energy dissipation and damping effect with relatively small deformations in bridge engineering, this invention proposes a flexible cable-stayed seesaw amplification device to connect different types of dampers, thereby achieving efficient damping. Since practical engineering often uses a single type of damper or a single type of damper to construct the amplification device, this invention overcomes the drawbacks of these practices by proposing an amplification device capable of amplifying the deformation of multiple types of dampers. The greatest advantage of this amplification device is its significant amplification effect, converting the horizontal deformation of the beam relative to the piers into the vertical and torsional deformations of different types of dampers. From the perspective of energy conversion, this amplification device can be considered to achieve multiple forms of energy conversion, an advantage not previously possessed by amplification devices. Furthermore, compared to existing amplification devices, this invention features smaller component cross-sections, less space occupation, and a larger amplification factor. The calculation formula provided by this invention can simulate and calculate the amplification factor of the amplification device during an actual earthquake, thereby ensuring the proper use of the device. Attached Figure Description

[0027] Figure 1 This is a structural diagram of a damper amplification device for bridges.

[0028] Figure 2 for Figure 1 A top-down structural diagram along the AA direction.

[0029] Figure 3 This is a schematic diagram of the deformation of the vibration damping and amplification device.

[0030] Figure 4 This is a graph showing the magnification factor.

[0031] 1. Beam; 2. Pier; 3. Inclined support rod; 4. Seesaw device; 5. First damper; 6. Second damper; 61. Steel plate; 62. Low yield point metal tube; 63. Connecting plate; 7. Flexible cable; 8. Horizontal support plate. Detailed Implementation

[0032] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0033] The following embodiments can be understood as illustrating a part of the structure or method of the present invention individually, or as combining the embodiments to explain the broader structure or method of the present invention.

[0034] Example 1

[0035] A damper vibration reduction and amplification device for bridges, such as Figure 1 As shown, the amplification device is set between the pier 2 and the beam 1, including a horizontal support plate 8 with one end fixedly connected to the pier 2 and the other end extending along the beam. The bottom of the horizontal support plate 8 is connected to the pier 2 through an inclined support rod 3 (to improve the strength of the horizontal support plate 8 and ensure stability during the seismic process). A seesaw device 4 is set at the upper end of the horizontal support plate 8. The two ends of the seesaw device 4 are connected to the horizontal support plate 8 through a first damper 5 and a second damper 6, respectively. The two ends of the seesaw device 4 are connected to the bottom of the beam through flexible cables 7, and the two flexible cables 7 are arranged to cross each other.

[0036] like Figure 1 As shown, the first damper 5 is a viscoelastic damper. The top end of the viscoelastic damper is connected to the end of the flexible cable 7, and the bottom end is fixedly connected to the top end of the horizontal support plate 8.

[0037] like Figure 1 , 2As shown, the second damper 6 is a torsional damper, which includes two steel plates 61 arranged along the direction of the beam 1. The two steel plates 61 are arranged opposite each other, and multiple low-yield-point metal round tubes 62 arranged horizontally and perpendicular to the direction of the beam 1 are connected between the two steel plates 61. A connecting plate 63 is connected between the multiple low-yield-point metal round tubes 62. One end of the connecting plate 63 is connected to the end of the flexible cable 7, and the bottom end of the steel plate 61 is fixedly connected to the top end of the horizontal support plate 8.

[0038] This embodiment provides a detailed structure of the amplification device. The working principle of the amplification device is as follows: When the beam 1 moves horizontally relative to the pier 2 under horizontal seismic action, one of the flexible cables 7 is stretched, causing the seesaw device 4 to rotate. This causes the first damper 5 and the second damper 6 connected to both ends of the plate to deform, forcing them into operation. The horizontal deformation of the beam 1 relative to the pier 2 is amplified and converted into the vertical deformation of the first damper 5 and the torsional deformation of the second damper 6 through the rotation of the seesaw device 4 via the cable 7, thus achieving energy dissipation and vibration reduction.

[0039] Example 2

[0040] A method for calculating the amplification factor of a damper vibration reduction amplification device for bridges, such as... Figure 3 As shown, it includes the following steps:

[0041] (1) Determine the expressions for Δx and Δy as shown in equations (1) and (2).

[0042]

[0043] In equations (1) and (2), Δx refers to the horizontal deformation at point B; Δy refers to the vertical deformation at point B, where point B represents the end point of the seesaw device 4; δ BC The axial deformation of the cable is represented by δ, and the horizontal deformation of the beam is represented by δ. The lengths of the cable before deformation are AB and BC, and the length of the cable after deformation is... The angle between the plate of the seesaw device 4 and the horizontal plane is β. When it is not deformed, the angle between one of the flexible cables 7 and the horizontal plane is α. After deformation, the angle between the plate of the seesaw device 4 and the horizontal plane is θ1. The angle between the flexible cable 7 after deformation and before deformation is θ2. Force represents the horizontal seismic force on the beam, and h represents the height of the end of the plate of the seesaw device.

[0044] When θ1 and θ2 are relatively small (sinθ1≈θ1, sinθ2≈θ2), equations (1) and (2) simplify as follows:

[0045]

[0046] Based on the definition of the amplified displacement of the damper, the expression for the amplified displacement of the damper is as follows:

[0047]

[0048] Substitute equations (3) and (4) into equation (5) to determine the displacement amplification value of one side damper;

[0049] The displacement amplification factor of the damper is determined according to equation (5) as shown in equation (6):

[0050]

[0051] Since the angle of β is relatively small in engineering practice, Δx is determined to be relatively small compared to Δy. When the influence of Δx is ignored, equation (6) simplifies to equation (7):

[0052]

[0053] Substituting equation (4) into equation (7), and simplifying, we obtain the final amplification factor, as shown in equation (8):

[0054]

[0055] Equation (8) is only the amplification factor for one side. Considering both sides, the amplification factor of the entire damping system is shown in Equation (9):

[0056]

[0057] In this embodiment, in order to analyze the vibration damping and amplification effect of the amplification device, α, β and As an analysis parameter. Through Figure 3 It can be seen that, with As α increases, the maximum amplification factor gradually decreases. With increasing α, the amplification factor f gradually decreases; conversely, with increasing β, the amplification factor f gradually increases. Based on this analysis, it can be concluded that when constructing this type of amplification device, attention should be paid to the deformation of the stay cable itself, ensuring it does not have a large axial elongation capacity; otherwise, it will significantly affect the amplification factor f. Figure 4 The figure shown is a magnification factor analysis diagram. This diagram is based on numerical simulation calculation and analysis according to equations (1) and (2), illustrating the actual magnification effect of this type of amplification device.

Claims

1. A method for calculating the amplification factor of a damper vibration reduction amplification device for bridges, characterized in that the damper vibration reduction amplification device for bridges is installed between the pier and the beam, including a horizontal support plate with one end fixedly connected to the pier and the other end extending along the beam, the bottom of the horizontal support plate being connected to the pier via an inclined support rod, a seesaw device being installed at the upper end of the horizontal support plate, the two ends of the seesaw device being connected to the horizontal support plate via a first damper and a second damper respectively, the two ends of the seesaw device being connected to the bottom of the beam via flexible cables, and the two flexible cables being arranged to cross each other; The first damper is a viscoelastic damper, the top end of which is connected to the end of the flexible cable, and the bottom end is fixedly connected to the top end of the horizontal support plate. The second damper is a torsional damper, which includes two steel plates arranged along the beam direction, the two steel plates being arranged opposite each other, and multiple low-yield-point metal tubes arranged horizontally and perpendicular to the beam direction being connected between the two steel plates, and a connecting plate connecting the multiple low-yield-point metal tubes, one end of the connecting plate being connected to the end of the flexible cable, and the bottom end of the steel plate being fixedly connected to the top end of the horizontal support plate. The method includes the following steps: (1) Determine , The expressions are shown in equations (1) and (2): （1）； （2）； In equations (1) and (2), This refers to the horizontal deformation at point B; This refers to the vertical deformation at point B, where point B represents the end point of the seesaw device. This represents the axial deformation of the cable. This represents the horizontal deformation of the beam; the length of the cable when it is not deformed is... , The length of the deformed cable is , The angle between the seesaw device's plate and the horizontal plane is... When undeformed, the angle between one of the flexible cables and the horizontal plane is... After deformation, the angle between the seesaw device's plate and the horizontal plane is... The angle between the flexible cable (7) after deformation and before deformation is Force represents the horizontal seismic force on the beam, and h represents the height of the end of the seesaw device. when and When the value is relatively small, equations (1) and (2) simplify as follows: （3）； （4）； Based on the definition of the amplified displacement of the damper, the expression for the amplified displacement of the damper is as follows: （5）； Substitute equations (3) and (4) into equation (5) to determine the displacement amplification value of one side damper; The displacement amplification factor of the damper is determined according to equation (5) as shown in equation (6): （6）； Due to the actual engineering practice The angle is relatively small, therefore it is determined Compared to Smaller, when ignored When the influence of , equation (6) simplifies to equation (7): （7）； Substituting equation (4) into equation (7), and simplifying, we obtain the final amplification factor, as shown in equation (8): （8）； Equation (8) is only the amplification factor for one side. Considering both sides, the amplification factor of the entire damping system is shown in Equation (9): （9）。

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