A double-column bridge pier tie beam equipped with lead viscoelastic dampers

Abstract

The present invention discloses a double-column bridge pier tie beam equipped with a lead viscoelastic damper, comprising a tie beam body, wherein the tie beam body has two tie beam sections, and a lead viscoelastic damper is installed between the two tie beam sections; the two ends of the lead viscoelastic damper are respectively fixedly connected to the tie beam section provided at the corresponding end via a fan-shaped connector. The present invention improves the ability of the tie beam to resist earthquakes by embedding a lead viscoelastic damper in the tie beam to improve the stress environment of the tie beam under earthquake action. The columnar lead core helps to increase the strength of the composite elastomer and enhance the buffering and shock-absorbing ability of the tie beam, while the stabilizing device can reduce the shaking of the new tie beam during earthquakes and enhance the stability of the structure. At the same time, the lead viscoelastic damper used in the present invention has few components, is easy to install, and has the advantages of simple structure and low cost.

Description

Technical Field

[0001] The invention relates to the field of bridge tie beam design, in particular to a double-column bridge pier tie beam equipped with a lead viscoelastic damper. Background Art

[0002] Western China is primarily mountainous and rugged, with numerous ravines, steep slopes, and rivers. To cross these large valleys and rivers, bridges are often designed with high piers, with double-legged high piers being a common pier type. As critical load-bearing components of the bridge substructure, piers are responsible for transferring the various loads of the bridge superstructure to the foundation. In bridge seismic design, tie beams, the components connecting the piers, are the most susceptible to damage during earthquakes.

[0003] Existing tie beam seismic buffering technologies have different design approaches, focusing on two main approaches: one is to design the main material of the tie beam, such as perforated mild steel tie beams; the other focuses on strengthening the tie beam's connection points. Both have distinct advantages and disadvantages: the former has a simple structure and unilaterally strengthens the tie beam material, resulting in a weak seismic effect; the latter uses dampers to connect the tie beam to the pier, increasing construction effort and costs.

[0004] A reasonable and effective approach to earthquake resistance is to install seismic devices (systems) on structures. These devices and the structure jointly withstand earthquakes, effectively storing and dissipating seismic energy to mitigate and adjust the structure's seismic response. This proactive earthquake resistance strategy represents a major breakthrough and development in current earthquake resistance strategies.

[0005] In view of this, providing a new type of tie beam with simple structure, low cost, wide application range and strong seismic buffering performance has become an urgent problem to be solved at this stage. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the prior art by providing a double-column bridge pier tie beam equipped with lead viscoelastic dampers to address the problems raised in the aforementioned technical background. (This addresses the technical problems of existing tie beams, such as their simple structure, insufficient stability, and poor seismic buffering.)

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A double-column bridge pier tie beam equipped with a lead viscoelastic damper includes a tie beam body, the tie beam body having two tie beam sections, and a lead viscoelastic damper installed between the two tie beam sections; the two ends of the lead viscoelastic damper are respectively fixedly connected to the tie beam section provided at the corresponding end through a fan-shaped connector.

[0009] In the above technical solution, the lead viscoelastic damper includes two composite elastic bodies symmetrically arranged in an upper and lower direction, each composite elastic body is composed of shear steel plates and elastic bodies alternately connected, and each composite elastic body has shear steel plates on both sides.

[0010] In the above technical solution, the fan-shaped connector 3 includes a T-shaped seat plate arranged in the middle part, and a fan-shaped connecting plate is fixed on both sides of the T-shaped seat plate. The T-shaped seat plate is connected to the two fan-shaped connecting plates to form two symmetrical installation grooves for fixing the composite elastomer.

[0011] In the above technical solution, each fan-shaped connecting plate has two bolt holes at the upper and lower ends, and both ends of each composite elastic body are fixedly connected to the two fan-shaped connecting plates of the fan-shaped connector provided at the corresponding end through bolts.

[0012] In the above technical solution, the two composite elastic bodies are connected and fixed by a stabilizing device.

[0013] In the above technical solution, the stabilizing device is composed of two symmetrically arranged steel parts, which are connected by bolts;

[0014] Two fixing grooves arranged vertically are provided on the side of the two steel parts close to each other. When the two steel parts are fixedly connected, a fixing groove in each steel part cooperates with the corresponding fixing groove in the other steel part to form a through hole groove for sleeve connection of the composite elastomer.

[0015] In the above technical solution, each of the steel parts is further provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are respectively provided at both ends of the steel part.

[0016] In the above technical solution, in each composite elastic body all There are multiple cylindrical lead cores interspersed.

[0017] In the above technical solution, each of the fan-shaped connectors is pre-placed in the corresponding tie beam section and fixed by bolts.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention improves the tie beam's earthquake resistance by embedding lead viscoelastic dampers within the tie beam to improve its stress environment during earthquakes. The cylindrical lead core helps increase the strength of the composite elastomer, enhancing the tie beam's ability to cushion and absorb shock, while the stabilizing device reduces earthquake sway and enhances structural stability. Furthermore, the lead viscoelastic damper utilizes fewer components, making installation easier, simpler, and more cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a three-dimensional schematic diagram of the present invention;

[0021] Figure 2 It is the front view of the present invention;

[0022] Figure 3 A top view of the present invention;

[0023] Figure 4 is a schematic diagram of the lead viscoelastic damper of the present invention;

[0024] Figure 5 is a three-dimensional schematic diagram of a fan-shaped connector;

[0025] Figure 6 is a cross-sectional view of a fan-shaped connector;

[0026] Figure 7 It is a structural diagram of steel parts;

[0027] In the figure, 1. Tie beam body; 1.1. Tie beam section; 2. Lead viscoelastic damper; 2.1. Composite elastomer; 2.11. Shear steel plate; 2.12. Elastomer; 2.13. Columnar lead core; 2.14. Cover; 3. Sector connector; 3.1. T-type seat plate; 3.2. Sector connecting plate; 3.3. Mounting groove; 3.4. Bolt hole; 4. Stabilizing device; 4.1. Steel member; 4.2. Fixing groove; 4.3. Reinforcement rib. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific examples. Taking a highway bridge as an example, the design concept of a cap beam not exceeding ten meters in length and a pile diameter of 1.5 meters is generally: if it is a bottom tie beam, the overall length of the tie beam is generally 8.2 meters, the height is 1.2 meters, and the width is generally designed to be 1 meter. Such a design is a relatively typical highway design scheme and is also a general requirement of the design atlas. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods, and the various details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0030] See Figures 1 to 7The present invention provides a double-column bridge pier tie beam equipped with a lead viscoelastic damper, comprising a tie beam body 1, wherein the tie beam body 1 has two tie beam sections 1.1 arranged symmetrically on the left and right, and a lead viscoelastic damper 2 is installed between the two tie beam sections 1.1; the two ends of the lead viscoelastic damper 2 are respectively fixedly connected to the tie beam section 1.1 provided at the corresponding end through a fan-shaped connector 3.

[0031] See Figures 1 to 4 The lead viscoelastic damper 2 includes two composite elastic bodies 2.1 symmetrically arranged vertically. Each composite elastic body 2.1 is composed of shear steel plates 2.11 and elastic bodies 2.12 alternately connected, and each composite elastic body 2.1 is flanked by shear steel plates 2.11. For example, the composite elastic body may be composed of four shear steel plates 2.11 alternately connected to three elastic bodies 2.12, with the elastic bodies 2.12 being directly made of rubber.

[0032] See Figure 4 , multiple cylindrical lead cores 2.13 are interspersed on each composite elastic body 2.1. Furthermore, the cylindrical lead cores 2.13 are arranged at equal distances, and the diameter and number of the cylindrical lead cores 2.13 are determined by the damping force and cross-section of the lead viscoelastic damper 2. When the required damping force is large and the damper size requirement is small, the number of cylindrical lead cores 2.13 can be appropriately increased or the diameter of the cylindrical lead cores can be increased. The number of inserted cylindrical lead cores 2.13 should not be too small or too large. Too small will weaken the shock absorption effect, and too large will affect the overall strength and stiffness of the composite elastic body 2. In the finite element analysis of the lead viscoelastic damper 2, the arrangement of the cylindrical lead cores 2.13 has little effect on the energy dissipation capacity of the lead viscoelastic damper 2. Characteristic parameters such as the hysteresis loop area, maximum force, energy dissipation coefficient, and equivalent damping ratio remain stable. The ratio of the thickness of the shear steel plate 2.11 to the elastic body 2.12 has a significant impact on the energy dissipation capacity of the damper. The hysteresis loop area remains basically stable, the maximum force gradually increases with the increase of the ratio, and the energy dissipation coefficient and equivalent damping ratio both show a downward trend. The number and diameter of the cylindrical lead cores 2.13 have a significant influence, and characteristic parameters such as the hysteresis loop area, maximum force, energy dissipation coefficient, and equivalent damping ratio of the damper all increase accordingly. In this example, the diameter of the cylindrical lead cores 2.13 is 100 mm, with each core spaced 500 mm apart and distributed horizontally along the composite elastic body 2.1. When the composite elastic body 2.1 is subjected to tension or compression during an earthquake, it consumes energy, reducing the effect of the force. At the same time, the inserted cylindrical lead cores 2.13 can also consume the energy of the composite elastic body 2.1 during torsional deformation. In the finite element analysis of the entire tie beam, prestressing is performed, the contact mode and constraints of the contact surface are selected, and a temperature field is given. Based on the output stress, strain and displacement results, in this example, the length of the composite elastic body is 4.2 m, the width is approximately 0.8 m, and the height is 0.5 m. The thickness ratio of the elastic body to the shear steel plate 2.11 is 0.67.

[0033] Both sides of the composite elastomer 2.1 are provided with shear steel plates 2.11, and the middle portion is provided with alternating shear steel plates 2.11 and elastomers 2.12. The holes for penetrating the cylindrical lead cores 2.13 on the shear steel plates 2.11 provided on one side of the composite elastomer 2.1 are blind holes, while the holes for penetrating the cylindrical lead cores 2.13 on the shear steel plates 2.11 provided on the other side of the composite elastomer 2.1 are through holes. The corresponding holes for penetrating the cylindrical lead cores 2.13 on the alternating shear steel plates 2.11 and elastomers 2.12 are all through holes. After the cylindrical lead cores 2.13 pass through the through holes to the blind holes on the other side, they are securely sealed by a sealing cover 2.14 provided on the through hole opening of the shear steel plates 2.11 on one side of the composite elastomer 2.1. The sealing cover 2.14 is fixed to the corresponding shear steel plates 2.11 provided with through holes by screws.

[0034] See Figure 5 and Figure 6 The fan-shaped connector 3 includes a T-shaped base plate 3.1 positioned in the middle. A fan-shaped connecting plate 3.2 is secured to each side of the T-shaped base plate 3.1. The T-shaped base plate 3.1 and the two fan-shaped connecting plates 3.2 are connected to form two symmetrical mounting slots 3.3 for securing the composite elastic body 2.1. Each fan-shaped connector 3 is pre-placed within the corresponding tie beam segment 1.1 during the casting process. The T-shaped base plate 3.1 of the fan-shaped connector 3 is fixedly connected to the tie beam segment 1.1 via bolts, with the bolt holes being countersunk.

[0035] The T-shaped seat plate 3.1 of the fan-shaped connector includes a base plate and a cross plate, and a countersunk seat hole is left on the upper and lower parts of the base plate. The cross plate divides the space formed by the T-shaped seat plate 3.1 and the two fan-shaped connecting plates 3.2 into two upper and lower parts; there are two bolt holes 3.4 on the upper and lower parts of each fan-shaped connecting plate 3.2, such as hinged hole bolts; the connection port of the mounting groove 3.3 of the fan-shaped connector 3 is consistent with the cross-section of the composite elastomer 2.1, and the port of the composite elastomer 2.1 is directly embedded in it; the ends of the two composite elastomers 2.1 arranged symmetrically in the upper and lower directions are fixedly connected to the two fan-shaped connecting plates 3.2 of the fan-shaped connector 3 arranged at the corresponding end by bolts.

[0036] See Figure 1 and Figure 7The two composite elastic bodies 2.1 are connected and secured by a stabilizing device 4, which consists of two symmetrically arranged steel pieces 4.1 connected by bolts. These pieces 4.1 are cast in a single pass from high-strength cast steel. The transverse length of the steel pieces 4.1 is determined by the overall length of the tie beam. In this example, the transverse length of the steel pieces 4.1 is 50 cm. The two stabilizing devices 4 are symmetrically arranged and placed over the lead viscoelastic damper 2, welded to the outer surface of the shear steel plate 2.11 located outside the lead viscoelastic damper 2.

[0037] Two fixing grooves 4.2 are provided on the side of the two steel parts 4.1 that are close to each other. The two fixing grooves 4.2 are arranged up and down. When the two steel parts 4.1 are fixedly connected, one fixing groove 4.2 in each steel part 4.1 cooperates with the corresponding fixing groove 4.2 in the other steel part to form a through-hole groove that is sleeved on the composite elastomer 2.1. The two through-hole grooves are respectively sleeved on two composite elastomers 2.1 that are symmetrically arranged up and down, and a gap is left between the inner surface of the through-hole groove and the outer surface of the composite elastomer in the up and down directions. In the present invention, the stabilizing device 4 can reduce the resistance to the twisting deformation of the composite elastomer 2.1 caused by external torque, ensure that the structure of the composite elastomer 2.1 is more stable and firm, and reduce the probability of the lead viscoelastic damper 2 falling apart due to external force.

[0038] In the present invention, each of the steel pieces 4.1 is further provided with a plurality of reinforcing ribs 4.3, which are respectively provided at both ends of a side of the steel piece 4.1 away from the fixing groove 4.2; and the corners of the steel pieces 4.1 are all rounded.

[0039] When using the present invention, the lead viscoelastic damper 2 and the stabilizing device 4 are first installed and ready for use. After the pier below the tie beam is cast, the tie beam body 1 is cast in layers. The fan-shaped connector 3 is pre-placed on the tie beam segment 1.1. After the tie beam segment 1.1 is cast, bolts are passed through the countersunk holes in the T-shaped seat plate 3.1 of the fan-shaped connector 3 to secure it to the two tie beam segments 1.1. Finally, the ends of the two composite elastic bodies 2.1 of the lead viscoelastic damper 2 are placed in the fan-shaped connector 3 at their corresponding ends. The two composite elastic bodies 3.1 are then sequentially placed in the mounting groove 3.3 of the fan-shaped connector 3. The composite elastic bodies 2.1 are then bolted to the fan-shaped connecting plate 3.2 of the fan-shaped connector 3 using hinged holes.

[0040] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A double-column bridge pier tie beam equipped with a lead viscoelastic damper, characterized in that: The invention comprises a tie beam body (1), wherein the tie beam body (1) has two tie beam sections (1.1), and a lead viscoelastic damper (2) is installed between the two tie beam sections (1.1); both ends of the lead viscoelastic damper (2) are fixedly connected to the tie beam section (1.1) provided at the corresponding end thereof via a fan-shaped connector (3); The lead viscoelastic damper (2) comprises two composite elastic bodies (2.1) symmetrically arranged in an upper and lower direction, each composite elastic body (2.1) being composed of shear steel plates (2.11) and elastic bodies (2.12) connected alternately, and both sides of each composite elastic body (2.1) are shear steel plates (2.11); The fan-shaped connector (3) comprises a T-shaped seat plate (3.1) arranged in the middle portion, a fan-shaped connecting plate (3.2) being fixed on both sides of the T-shaped seat plate (3.1), and the T-shaped seat plate (3.1) and the two fan-shaped connecting plates (3.2) being connected to form two vertically symmetrical mounting grooves (3.3) for fixing the composite elastic body (2.1); The two composite elastic bodies (2.1) are connected and fixed via a stabilizing device (4); The stabilizing device (4) comprises two symmetrically arranged steel parts (4.1), and the two steel parts (4.1) are connected by bolts; Two fixing grooves (4.2) are provided on the sides of the two steel parts (4.1) that are close to each other. When the two steel parts (4.1) are fixedly connected, a fixing groove (4.2) in each steel part (4.1) cooperates with a corresponding fixing groove (4.2) in the other steel part (4.1) to form a through-hole groove for sleeve-engaging the composite elastic body (2.1).

2. The double-column bridge pier tie beam equipped with a lead viscoelastic damper according to claim 1, characterized in that: Each fan-shaped connecting plate (3.2) has two bolt holes (3.4) at the top and bottom, respectively. Both ends of each composite elastic body (2.1) are fixedly connected to the two fan-shaped connecting plates (3.2) of the fan-shaped connector (3) provided at the corresponding end thereof via bolts.

3. The double-column bridge pier tie beam equipped with a lead viscoelastic damper according to claim 1, characterized in that: Each of the steel pieces (4.1) is also provided with a plurality of reinforcing ribs (4.3), and the plurality of reinforcing ribs (4.3) are respectively provided at both ends of the steel piece (4.1).

4. The double-column bridge pier tie beam equipped with a lead viscoelastic damper according to claim 1, characterized in that: A plurality of columnar lead cores (2.13) are inserted into each composite elastic body (2.1).

5. The double-column bridge pier tie beam equipped with a lead viscoelastic damper according to claim 1, characterized in that: Each of the fan-shaped connectors (3) is pre-placed in the corresponding tie beam section (1.1) and fixed by bolts.

Images