Reinforcing device for foamed aluminum damper of self-anchored suspension bridge

Abstract

The invention discloses a reinforcing device for a foamed aluminum damper of a self-anchored suspension bridge. The reinforcing device comprises a driving gear, a gear ring, a pressing block, a foamed aluminum damping layer, a limiting groove, a connecting hinge device, a connecting rod, a base, a foamed aluminum storage bin and a waste foamed aluminum discharging channel. The driving gear is meshed with the gear ring and rolls along the inner ring of the gear ring, the ratio of the reference diameters of the two gears is 1: 2, the center of the connecting hinge device on the driving gear is just located on the reference circle of the driving gear, and it is guaranteed that when the driving gear moves along the gear ring, the motion trail of the center of the connecting hinge device is a reciprocating straight line. When an earthquake occurs, the main beam and the bridge pier generate relative motion, then the connecting hinge device is driven to do reciprocating motion, the pressing block fixed to the driving gear gets close to and compresses the foamed aluminum damping layer, meanwhile, the pressing block and the surface of the foamed aluminum damping layer do tangential motion, and friction force is generated. The foamed aluminum damping layer can generate elasticoplastic deformation, and the friction effect between the foamed aluminum damping layer and the contact face of the pressing block plays the role of energy dissipation and damping.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge structure vibration control, relates to the vibration reduction technology of bridges, and particularly relates to a reinforcing device for a foam aluminum damper of a self-anchored suspension bridge. Background Art

[0002] In the field of civil engineering, especially in bridge structure design, earthquake is an important factor that cannot be ignored. When an earthquake occurs, the main beam of the bridge will produce a corresponding degree of displacement according to the magnitude of the earthquake, and the shear force at the pier will also increase accordingly. As the span and scale of modern bridges become larger and larger, the displacement and internal force response under the action of earthquakes are becoming more and more significant, which may not only cause damage to structural components such as main beams and piers, but also seriously threaten the safety and stability of the entire bridge structure system. The main cable of the self-anchored suspension bridge is anchored at both ends of the main beam, and the longitudinal displacement of the main beam is usually not constrained at the cable tower, resulting in a great impact of the longitudinal earthquake on the main beam and cable system, causing excessive bending moment of the cable tower, and it is also easy for the main beam to collide with the approach bridge or pier.

[0003] In order to reduce the seismic response, the current common shock absorption method is to add a liquid viscous damper between the main tower (side pier) and the main beam. The viscous damper can increase the damping of the structure and dissipate the energy of vibration without changing the structural period, but the liquid viscous damper is prone to oil leakage and failure (Zhu Dongfei. Failure analysis of viscous dampers and their influence on structural performance [D]. Guangzhou University, 2016.). In recent years, a foam aluminum shock-absorbing damper has emerged (Xuan Peng. Experimental study on vibration reduction mechanism and mechanical properties of high-performance foam aluminum [D]. Southeast University, 2016.), which has the advantages of easy maintenance and good durability. However, after the foam aluminum is compressed to plastic deformation, it cannot rebound, which reduces the energy dissipation characteristics of the damper during multi-cycle cycles.

[0004] Based on the problems existing in the prior art, the present invention proposes a reinforcement device for a foam aluminum damper of a self-anchored suspension bridge, which can automatically fall off from the damper after the foam aluminum reaches a certain plastic deformation, replenish new foam aluminum, and increase the energy dissipation effect of friction, thereby improving the overall energy dissipation performance of the foam aluminum damper. Summary of the invention

[0005] The present invention provides a reinforcement device for a foam aluminum damper of a self-anchored suspension bridge, the main components of which include a driving gear 1, a gear ring 2, a pressing block 3, a foam aluminum damping layer 4, a limit groove 5, a connecting hinge device 6, a connecting rod 7, a base 8, a foam aluminum storage bin 9, and a waste foam aluminum removal channel 10. The connecting rod 7 is connected to the main beam, and the base 8 is installed on the tower beam and the side pier.

[0006] When an earthquake occurs, the main beam and the bridge pier will move relative to each other, and the driving gear 1 will move in an arc along the gear ring 2 through the connecting hinge device 6. The pressing block 3 fixed on the driving gear 1 will squeeze the foam aluminum damping layer 4. Since the foam aluminum will undergo elastic-plastic deformation and the friction between the foam aluminum and the arc contact surface will play an energy-consuming and damping role, when the plastic deformation of the foam aluminum damping layer 4 is reduced to the size of the waste foam aluminum removal channel 10 below the limit groove 5, it will be removed from the waste foam aluminum removal channel 10, and the new foam aluminum damping layer 4 in the foam aluminum storage bin 9 will be added to the limit groove 5 from which the foam aluminum damping layer has just been removed. In this way, when the earthquake displacement reaches 60% of the design peak value, the foam aluminum damping layer 4 is compressed to a size smaller than the limit groove 5 and is removed from the waste foam aluminum removal channel 10. By continuously adding new foam aluminum, it is ensured that the foam aluminum has sufficient energy-consuming performance to improve the damping performance of the entire damper.

[0007] The technical solution of the present invention:

[0008] An enhancement device for a foam aluminum damper of a self-anchored suspension bridge, comprising a driving gear 1, a gear ring 2, a pressing block 3, a foam aluminum shock-absorbing layer 4, a limiting groove 5, a connecting hinge device 6, a connecting rod 7, a base 8, a foam aluminum storage bin 9 and a waste foam aluminum discharge channel 10; one end of the connecting rod 7 is connected to the main beam, and the other end is connected to the driving gear 1 through the connecting hinge device 6; the base 8 is installed on the tower cross beam and the side pier, the gear ring 2 is fixed on the base 8, the foam aluminum shock-absorbing layer 4, the limiting groove 5, the foam aluminum storage bin 9 and the waste foam aluminum discharge channel 10 are all located on the base 8, multiple foam aluminum shock-absorbing layers 4 are located in the foam aluminum storage bin 9, and the lowermost foam aluminum shock-absorbing layer 4 is located in the limiting groove 5, and the waste foam aluminum discharge channels 10 are all located directly below the foam aluminum storage bin 9; the driving gear 1 meshes with the gear ring 2 and rolls along the inner ring of the gear ring 2, and the ratio of the pitch circle diameter of the driving gear 1 to the gear ring 2 is 1:2. The center of the connecting hinge device 6 on the driving gear 1 is just located on the arc of the pitch circle of the driving gear 1, ensuring that when the driving gear 1 moves along the gear ring 2, the movement track of the center of the connecting hinge device 6 is a reciprocating straight line; the outer dimension of the foam aluminum shock-absorbing layer 4 is larger than the size of the waste foam aluminum discharge channel 10 below the limiting groove 5, and the foam aluminum shock-absorbing layer 4 cannot pass through the waste foam aluminum discharge channel 10 when not compressed; the pressing block 3 is fixed together with the driving gear 1 and is in contact with the foam aluminum shock-absorbing layer 4 at the initial position. The pressing block 3 moves together with the driving gear 1, and its movement track approaches and compresses the foam aluminum shock-absorbing layer 4. At the same time, the pressing block 3 makes a tangential movement on the surface of the foam aluminum shock-absorbing layer 4, generating frictional force; when an earthquake occurs, the main beam and the bridge pier generate relative movement, thereby driving the connecting hinge device 6 to make a reciprocating movement. The connecting hinge device 6 drives the driving gear 1 to make an arc movement along the gear ring 2. The pressing block 3 fixed on the driving gear 1 approaches and compresses the foam aluminum shock-absorbing layer 4. At the same time, the pressing block 3 makes a tangential movement on the surface of the foam aluminum shock-absorbing layer 4, generating frictional force; the foam aluminum shock-absorbing layer 4 will undergo elastoplastic deformation, and the frictional action between the contact surfaces with the pressing block 3 all plays a role in energy dissipation and shock absorption;

[0009] When the plastic deformation of the foam aluminum shock-absorbing layer 4 shrinks to the size of the waste foam aluminum discharge channel 10 below the limiting groove 5, it will be discharged from the waste foam aluminum discharge channel 10, and the new foam aluminum shock-absorbing layer 4 in the foam aluminum storage bin 9 will automatically supplement the limiting groove 5 where the just-discharged foam aluminum shock-absorbing layer 4 was located. In this way, when the earthquake displacement reaches 60% of the design peak value, the foam aluminum shock-absorbing layer 4 will be compressed to a size smaller than the limiting groove 5 and discharged from the waste foam aluminum discharge channel 10; by continuously supplementing the new foam aluminum shock-absorbing layer 4, it is ensured that the foam aluminum shock-absorbing layer 4 has sufficient energy dissipation capacity to improve the shock absorption performance of the entire damper.

[0010] The effects and benefits of the present invention are: (1) through the device, the reciprocating motion between the main beam and the pier is transmitted to the two motions of normal compression and tangential friction between the pressure block and the foam aluminum shock-absorbing layer, so that the foam aluminum shock-absorbing layer undergoes two energy dissipation modes: elastic-plastic deformation and friction energy dissipation; (2) by setting the size of the waste foam aluminum removal channel, the foam aluminum that has lost its energy dissipation capacity can be removed in time and replaced with new foam aluminum. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a reinforcement device for a foam aluminum damper for a self-anchored suspension bridge.

[0012] Figure 2 An elevation view of a reinforcement device for a foam aluminum damper for a self-anchored suspension bridge.

[0013] In the figure: 1 driving gear; 2 gear ring; 3 pressure block; 4 foam aluminum shock-absorbing layer; 5 limit groove; 6 connecting hinge device; 7 connecting rod; 8 base; 9 foam aluminum storage bin; 10 waste foam aluminum removal channel. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention is described in detail below in conjunction with the technical scheme and the accompanying drawings.

[0015] Example

[0016] The span of a self-anchored suspension bridge is 125m+300m+125m and the width is 28m. The main beam is a steel box beam, and the shock-absorbing damper of the present invention is installed at the cable tower and the side pier respectively. The connecting rod 7 in the device of the present invention is connected to the main beam, the base 8 is installed on the cable tower cross beam and the side pier, the gear ring 2 is fixed on the base 8, and the foam aluminum shock-absorbing layer 4, the limit groove 5, the foam aluminum storage bin 9, and the waste foam aluminum removal channel 10 are also located on the base 8. The driving gear 1 is meshed with the gear ring 2 and rolls along the inner ring of the gear ring 2. The pitch circle diameters of the two gears are 120mm and 240mm respectively. The module of the gear used is 10 and the tooth thickness is 40mm. The center of the connecting hinge device 6 on the driving gear 1 is just located on the pitch circle of the driving gear 1. This design ensures that when the driving gear 1 moves along the gear ring 2, the motion trajectory of the center of the connecting hinge device 6 is a reciprocating straight line. The outer dimensions of the foam aluminum damping layer 4 are 100*100*80mm, and the curved surface shape is consistent with the pressing block 3. The dimensions of the waste foam aluminum removal channel 10 below the limiting groove 5 are 110*100*48mm. Therefore, the foam aluminum damping layer 4 cannot pass through the waste foam aluminum removal channel 10 when it is not compressed. The pressing block 3 is a fan-shaped solid structure. The fan-shaped circle center is displaced 0 to 100mm away from the tooth on the driving gear 1 and is fixed to the driving gear 1. The initial position is in contact with the foam aluminum damping layer 4. The pressing block 3 moves with the driving gear 1, and its movement trajectory approaches and compresses the foam aluminum damping layer 4. At the same time, the pressing block 3 and the surface of the foam aluminum damping layer 4 make tangential motion to generate friction.

[0017] When an earthquake occurs, the main beam and the bridge pier move relative to each other, which in turn drives the connecting hinge device 6 to reciprocate. The connecting hinge device 6 drives the driving gear 1 to move in an arc along the gear ring 2. The pressing block 3 fixed on the driving gear 1 approaches and compresses the foam aluminum shock-absorbing layer 4. At the same time, the pressing block 3 and the surface of the foam aluminum shock-absorbing layer 4 move tangentially, generating friction. The foam aluminum shock-absorbing layer 4 will undergo elastic-plastic deformation, and the friction between the contact surface with the pressing block 3 plays an energy-consuming and shock-absorbing role.

[0018] When the plastic deformation of the aluminum foam damping layer 4 is reduced to the size of the waste aluminum foam removal channel 10 below the limit groove 5, it will be removed from the waste aluminum foam removal channel 10, and the new aluminum foam damping layer 4 in the aluminum foam storage bin 9 will be automatically added to the limit groove 5 from which the aluminum foam damping layer has just been removed. This cycle repeats until the earthquake displacement reaches 60% of the design peak value, and the aluminum foam damping layer 4 is compressed to a size smaller than the limit groove 5 and removed from the waste aluminum foam removal channel 10. By continuously adding new aluminum foam, it is ensured that the aluminum foam has sufficient energy dissipation capacity to improve the damping performance of the entire damper.

Claims

1. A reinforcement device for a foam aluminum damper of a self-anchored suspension bridge, characterized in that: The reinforcing device comprises a driving gear (1), a gear ring (2), a pressure block (3), a foam aluminum shock absorbing layer (4), a limiting groove (5), a connecting hinge device (6), a connecting rod (7), a base (8), a foam aluminum storage bin (9) and a waste foam aluminum removal channel (10); one end of the connecting rod (7) is connected to the main beam, and the other end is connected to the driving gear (1) through the connecting hinge device (6); the base (8) is installed on the tower cross beam and the side pier, the gear ring (2) is fixed on the base (8), the foam aluminum shock absorbing layer (4), the limiting groove (5), the foam aluminum storage bin (9) and the waste foam aluminum removal channel (10) are all located on the base (8), a plurality of foam aluminum shock absorbing layers (4) are located in the foam aluminum storage bin (9), the lowest foam aluminum shock absorbing layer (4) is located in the limiting groove (5), and the waste foam aluminum removal channel (10) is located in the foam aluminum storage bin (9). (10) are located directly below the foam aluminum storage bin (9); the driving gear (1) is meshed with the gear ring (2) and rolls along the inner ring of the gear ring (2); the ratio of the pitch circle diameters of the driving gear (1) and the gear ring (2) is 1:2; the center of the connecting hinge device (6) on the driving gear (1) is just located on the arc of the pitch circle of the driving gear (1), ensuring that when the driving gear (1) moves along the gear ring (2), the motion trajectory of the center of the connecting hinge device (6) is a straight line of reciprocating motion; the pressing block (3) is fixed to the driving gear (1), and the initial position is in contact with the foam aluminum shock absorbing layer (4). The pressing block (3) moves with the driving gear (1), and its motion trajectory approaches and compresses the foam aluminum shock absorbing layer (4). At the same time, the pressing block (3) and the surface of the foam aluminum shock absorbing layer (4) perform tangential motion to generate friction; When an earthquake occurs, the main beam and the bridge pier move relative to each other, thereby driving the connecting hinge device (6) to make a reciprocating motion. The connecting hinge device (6) drives the driving gear (1) to make a circular arc motion along the gear ring (2). The pressing block (3) fixed on the driving gear (1) approaches and compresses the foam aluminum shock-absorbing layer (4). At the same time, the pressing block (3) and the surface of the foam aluminum shock-absorbing layer (4) move tangentially, generating friction. The foam aluminum shock-absorbing layer (4) undergoes elastic-plastic deformation, and the friction between the contact surface with the pressing block (3) plays an energy-consuming and shock-absorbing role. When the plastic deformation of the foam aluminum shock absorbing layer (4) is reduced to the size of the waste foam aluminum removal channel (10) below the limiting groove (5), it is removed from the waste foam aluminum removal channel (10), and the new foam aluminum shock absorbing layer (4) located in the foam aluminum storage bin (9) is automatically added to the limiting groove (5) from which the foam aluminum shock absorbing layer (4) has just been removed. This cycle continues. When the earthquake displacement reaches 60% of the design peak value, the foam aluminum shock absorbing layer (4) is compressed to a size smaller than the limiting groove (5) and is removed from the waste foam aluminum removal channel (10).

2. The enhancement device according to claim 1, characterized in that: The outer dimensions of the foam aluminum shock absorbing layer (4) are larger than the dimensions of the waste foam aluminum removal channel (10) below the limiting groove (5); the foam aluminum shock absorbing layer (4) cannot pass through the waste foam aluminum removal channel (10) when not compressed.

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