Double-energy-dissipation anti-seismic damper

Abstract

The invention relates to the technical field of bridge seismic resistance, in particular to a double-energy-consumption seismic damper which comprises a positive Poisson's ratio energy consumption component and a shearing energy consumption module which are installed between the pier side and the beam bottom of a bridge, the two sides of the positive Poisson's ratio energy consumption component are fixedly connected with the pier side and the beam bottom respectively, and the shearing energy consumption module is fixedly connected with the beam bottom. A linkage triggering mechanism is arranged between the positive Poisson's ratio energy consumption component and the shearing energy consumption module, when the transverse compression amount of the positive Poisson's ratio energy consumption component does not reach a preset threshold value, the positive Poisson's ratio energy consumption component and the shearing energy consumption module are kept in a separated state, and when the transverse compression amount of the positive Poisson's ratio energy consumption component reaches the preset threshold value, the shearing energy consumption module is kept in a separated state. The positive Poisson's ratio energy consumption component drives the shear energy consumption module to perform shear energy consumption through the linkage triggering mechanism; the positive Poisson's ratio energy consumption component, the shearing energy consumption module and the linkage triggering mechanism are made of steel. The damper realizes dual energy consumption through combination of the positive Poisson's ratio material and the frame structure, and is simple in structure, stable in energy consumption and wide in application range.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge earthquake resistance, and in particular to a double energy-absorbing earthquake-resistant damper. Background Art

[0002] As modern bridge engineering develops toward larger spans and greater flexibility, structural seismic performance has become a key consideration in bridge design. Seismic loads are characterized by randomness, multidimensionality, and strong destructiveness. Traditional seismic design concepts, which rely solely on passive defense through structural ductility and energy dissipation, are no longer able to meet safety requirements in complex seismic environments. Bridge structures in seismic zones often require the addition of external dampers to dissipate seismic energy and prevent damage or even collapse under seismic loads. Adding external dampers can effectively reduce the size of the bridge structure, saving on total project investment and playing a key role in ensuring the safe operation of bridge structures under seismic loads.

[0003] Currently, dampers are often installed between the pier top and beam bottom during bridge design both domestically and internationally to dissipate seismic energy, reduce structural damage, and enable the bridge to operate normally under seismic loads. However, commonly used dampers are often only able to withstand a specific seismic load and cannot achieve the dual purpose of energy dissipation.

[0004] In view of the limitations of a single energy dissipation mode, the industry has begun to explore the technology of collaborative working of dual energy dissipation mechanisms in recent years. Chinese invention patent CN111691566A discloses a dual energy dissipation damper combining viscoelastic materials and low-yield steel. The device adopts a layered energy dissipation design: in the wind shock and small earthquake stages, the viscoelastic material realizes the first energy dissipation through shear deformation; in the medium and large earthquake stages, the low-yield steel performs the second energy dissipation through plastic buckling. Although the design realizes the hierarchical control of energy dissipation, it is found in actual application that the mechanical properties of viscoelastic materials have significant time dependence. In the long-term service process, they are affected by environmental aging and stress relaxation, and their storage modulus and loss factor will produce irreversible attenuation and degradation, resulting in the energy dissipation effect in the small earthquake stage weakening year by year.

[0005] Another improved solution, described in Chinese invention patent CN114934607A, proposes a metal-variable friction composite damper. This device uses a pre-tightening bolt assembly to adjust the friction interface pressure. Hysteresis energy dissipation occurs in the metal plate during minor earthquakes, while friction energy dissipation occurs during moderate to severe earthquakes. While this design theoretically achieves dual-stage energy dissipation, practical engineering applications have exposed the following issues: Pre-tightening bolts are susceptible to stress relaxation under prolonged vibration, resulting in a decrease in the positive pressure at the friction interface. This can potentially cause the entire device to fail, seriously impacting the reliability of energy dissipation during major earthquakes.

[0006] The present invention is aimed at the above-mentioned technical bottlenecks. Through the innovative combination design of positive Poisson's ratio materials and frame structures, it achieves the goals of stable energy consumption, strong adaptability, and dual energy consumption, effectively overcoming the inherent defects of the existing technology. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a dual energy dissipation seismic damper, which achieves the purpose of dual energy dissipation by combining positive Poisson's ratio materials with frame structures, and has the advantages of stable energy dissipation, strong adaptability, and dual energy dissipation; in small earthquakes, the yield of steel positive Poisson's ratio materials with low yield stiffness is used to achieve energy dissipation, and in medium and large earthquakes, the shear deformation of the frame structure is used to dissipate energy, and the purpose of multi-level energy dissipation is achieved through multiple stiffness adaptations, which has the advantages of stable energy dissipation, long service life, and no influence from the external environment.

[0008] The technical solutions of the present invention are as follows:

[0009] The double energy-absorbing seismic damper includes a positive Poisson's ratio energy-absorbing component and a shear energy-absorbing module installed between the pier side and the bottom of the beam of the bridge. The two sides of the positive Poisson's ratio energy-absorbing component are fixedly connected to the pier side and the bottom of the beam respectively, and the shear energy-absorbing module is fixedly connected to the bottom of the beam. A linkage trigger mechanism is provided between the positive Poisson's ratio energy-absorbing component and the shear energy-absorbing module. When the lateral compression of the positive Poisson's ratio energy-absorbing component does not reach a preset threshold, the positive Poisson's ratio energy-absorbing component and the shear energy-absorbing module remain separated. When the lateral compression of the positive Poisson's ratio energy-absorbing component reaches a preset threshold, the positive Poisson's ratio energy-absorbing component drives the shear energy-absorbing module through the linkage trigger mechanism to generate shear deformation for shear energy absorption. The positive Poisson's ratio energy-absorbing component, the shear energy-absorbing module and the linkage trigger mechanism are made of steel. Under the action of an earthquake, part of the energy is first dissipated through the positive Poisson's ratio energy-absorbing component. When the earthquake load increases, the shear energy-absorbing module further dissipates energy, thereby significantly improving the seismic performance of the bridge structure.

[0010] The positive Poisson's ratio energy-absorbing component is composed of a number of circular-end units fixedly connected to each other. The circular-end units are periodically arranged in the horizontal and vertical directions. The cross-section of the circular-end units has an axisymmetric geometric configuration, including a central straight section and circular arc sections on both sides. This periodically arranged structure can evenly disperse seismic loads and improve energy dissipation efficiency. At the same time, the axisymmetric geometric configuration of the circular-end units helps to produce stable deformation when compressed, thereby dissipating energy more effectively.

[0011] The shear energy dissipation module consists of at least two frame units arranged in parallel along the transverse direction of the bridge. The frame units are rounded rectangular closed frames. When subjected to shear force, the frame units can produce large deformations, thereby effectively dissipating seismic energy. The rectangular closed frame structure also enhances its stability and durability.

[0012] The linkage trigger mechanism includes a protrusion structure fixedly connected to the positive Poisson's ratio energy absorbing component and a hole structure fixedly connected to the frame unit; when the compression of the positive Poisson's ratio energy absorbing component does not reach a preset threshold, the protrusion structure does not embed into the hole structure on the frame unit, and the positive Poisson's ratio energy absorbing component remains separated from the frame unit; when the lateral compression of the positive Poisson's ratio energy absorbing component reaches a preset threshold, the protrusion structure embeds into the hole structure, and the positive Poisson's ratio energy absorbing component drives the frame unit to generate shear deformation to dissipate shear energy; through the cooperation of the protrusion structure and the hole structure, the linkage between the positive Poisson's ratio energy absorbing component and the shear energy dissipation module is realized.

[0013] The positive Poisson's ratio energy-absorbing component is fixedly connected to vertical baffles and vertical side plates on both sides respectively. The top of the vertical baffle is fixedly connected to a top plate, which is fixedly connected to the bottom of the bridge beam. The frame unit is fixedly connected to the bottom of the top plate. The side of the vertical side plate is fixedly connected to a transverse push rod, and the other end of the transverse push rod is fixedly connected to a lateral connecting plate, which is fixedly connected to the pier side of the bridge; this ensures the stability and reliability of the damper under earthquake action, and is easy to install and maintain.

[0014] The bottom of the frame unit is fixedly connected to a base plate, on which a hole structure is provided; this provides a point of action for the linkage trigger mechanism, so that the positive Poisson's ratio energy-absorbing component can drive the shear energy-absorbing module to work when the lateral compression reaches a preset threshold; the protrusion structure can move with the deformation of the positive Poisson's ratio energy-absorbing component, and when the preset threshold is reached, it is embedded in the hole structure of the frame unit, triggering the operation of the shear energy-absorbing module.

[0015] The raised structure is arranged on the top of the L-shaped connecting plate, the vertical plate of the L-shaped connecting plate is fixedly connected to the vertical side plate, the horizontal plate of the L-shaped connecting plate is arranged above the positive Poisson's ratio energy dissipation component, and the raised structure is arranged on the top of the horizontal plate of the L-shaped connecting plate.

[0016] The positive Poisson's ratio energy dissipation components, shear energy dissipation modules and linkage trigger mechanisms are all coated with anti-corrosion coatings; they can prevent steel from rusting in harsh environments such as moisture and corrosion, thereby extending the service life of the damper and reducing maintenance costs.

[0017] The round-end unit is made of steel with a yield point of 100-235MPa; this material has good mechanical properties and plastic deformation capacity, and can produce stable deformation and dissipate energy under earthquake action.

[0018] The vertical plate and vertical side plate of the L-shaped connecting plate are fixedly connected by bolts A, which are high-strength bolts of grade 10.9 or 12.9. This ensures the stability and reliability of the connection while facilitating installation and disassembly. The use of high-strength bolts also improves the tensile and shear resistance of the damper under earthquake action.

[0019] The beneficial effects of the present invention are:

[0020] 1. The dual energy dissipation seismic damper disclosed in the present invention combines the compression energy dissipation of the positive Poisson's ratio material and the shear energy dissipation of the frame structure to achieve the purpose of dual energy dissipation; during small earthquakes, the seismic energy is mainly dissipated through the compression deformation of the positive Poisson's ratio material; during medium and large earthquakes, the lateral deformation of the positive Poisson's ratio material will trigger the linkage trigger mechanism, causing the frame structure to shear deform, further dissipating the seismic energy. This multi-stage energy dissipation mechanism significantly improves the seismic performance of the bridge structure.

[0021] 2. The dual energy dissipation anti-seismic damper disclosed in the present invention has a positive Poisson's ratio material and a frame structure made of steel. Steel has good mechanical properties and stability, which can ensure that the damper maintains stable energy dissipation capacity during long-term use.

[0022] 3. The dual energy-absorbing seismic damper disclosed in the present invention can be well adapted to bridges in different site categories by adjusting parameters such as the thickness of the coil, the radius of the circular curve, the number of frame units, and the number of circular-end units. This flexibility enables the damper to be widely used in various types of bridge structures to meet different engineering requirements.

[0023] 4. The dual energy-absorbing seismic damper disclosed in the present invention has a relatively simple structure and is composed of basic components such as a positive Poisson's ratio energy-absorbing component, a shear energy-absorbing module and a linkage trigger mechanism. These components can be mass-produced in factories, reducing manufacturing costs. At the same time, the assembly and installation of the damper are also relatively simple, which is conducive to improving construction efficiency.

[0024] 5. The dual energy dissipation anti-seismic damper disclosed in the present invention has all components coated with anti-corrosion paint, which helps to extend the service life of the damper and reduce maintenance costs; the anti-corrosion paint can prevent steel from rusting in harsh environments such as moisture and corrosion, ensuring the long-term stable operation of the damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of a dual energy dissipation anti-seismic damper according to an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the positive Poisson's ratio energy dissipation component of the dual energy dissipation anti-seismic damper according to an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the structure of the round-end unit of the dual energy dissipation anti-seismic damper according to an embodiment of the present invention;

[0028] Figure 4Schematic diagram of the structure of the frame unit of the dual energy dissipation anti-seismic damper according to an embodiment of the present invention;

[0029] Figure 5 Schematic diagram of the structure of the vertical side plate of the dual energy dissipation anti-seismic damper according to an embodiment of the present invention;

[0030] Figure 6 A side view of an L-shaped connecting plate of a dual energy dissipation anti-seismic damper according to an embodiment of the present invention;

[0031] The components represented by the reference numerals in the figure are:

[0032] The present invention comprises: 1. a round-end unit, 2. a positive Poisson's ratio energy-absorbing component, 3. a frame unit, 4. a top plate, 5. a vertical baffle, 6. a bottom plate, 7. a vertical side plate, 8. an L-shaped connecting plate, 9. a transverse push rod, 10. a lateral connecting plate, 11. a bolt A, and 12. a bolt B. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0034] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0035] like Figure 1As shown, the dual energy-absorbing seismic damper includes a positive Poisson's ratio energy-absorbing component 2 and a shear energy-absorbing module installed between the pier side and the bottom of the beam of the bridge. The two sides of the positive Poisson's ratio energy-absorbing component 2 are fixedly connected to the pier side and the bottom of the beam respectively, and the shear energy-absorbing module is fixedly connected to the bottom of the beam. A linkage trigger mechanism is provided between the positive Poisson's ratio energy-absorbing component 2 and the shear energy-absorbing module. When the lateral compression of the positive Poisson's ratio energy-absorbing component 2 does not reach a preset threshold, the positive Poisson's ratio energy-absorbing component 2 and the shear energy-absorbing module remain separated. When the lateral compression of the positive Poisson's ratio energy-absorbing component 2 reaches a preset threshold, the positive Poisson's ratio energy-absorbing component 2 drives the shear energy-absorbing module through the linkage trigger mechanism to generate shear deformation for shear energy absorption.

[0036] The preset threshold for the lateral compression of the positive Poisson's ratio energy dissipation component 2 is a critical parameter in the dual energy dissipation seismic damper of the present invention, determining the timing of activation of the linkage trigger mechanism. Specifically, the preset threshold refers to the critical value at which the linkage trigger mechanism activates the shear energy dissipation module when the lateral compression of the positive Poisson's ratio energy dissipation component reaches a specific value under seismic load.

[0037] Factors to consider when determining the preset threshold:

[0038] Earthquake intensity: The earthquake intensity varies in different regions, so the preset threshold needs to be determined based on the earthquake intensity of the specific region. In areas with higher earthquake intensity, the preset threshold should be set relatively low so that the shear energy dissipation module can be activated under smaller earthquake loads; in areas with lower earthquake intensity, the preset threshold can be set relatively high.

[0039] Bridge structure characteristics: Different bridge structures have different characteristics such as stiffness and mass distribution. Therefore, the preset threshold needs to be determined based on the characteristics of the specific bridge structure. For bridge structures with greater stiffness and more uniform mass distribution, the preset threshold can be set relatively high; while for bridge structures with less stiffness and uneven mass distribution, the preset threshold should be set relatively low.

[0040] Design requirements: The preset threshold is determined based on the design requirements of the bridge structure (such as seismic fortification intensity, displacement limit, etc.). Bridge structures with higher design requirements require higher seismic performance, so the preset threshold should be set relatively low to ensure that the shear energy dissipation module can be activated under smaller seismic loads; while bridge structures with lower design requirements can appropriately increase the preset threshold.

[0041] How to adjust the preset threshold:

[0042] In practical applications, the preset threshold can be adjusted according to the actual situation of the bridge structure and earthquake monitoring data. Specifically, the preset threshold can be adjusted by the following methods:

[0043] Experimental verification: Model tests or field tests are used to verify the energy dissipation effect and seismic performance of the damper under different preset thresholds, so as to determine the optimal preset threshold.

[0044] Numerical simulation: Finite element analysis and other numerical simulation methods are used to simulate the response and energy consumption of the damper under different preset thresholds, providing a theoretical basis for actual adjustment.

[0045] Experience reference: Refer to the application experience and data of dampers in similar bridge structures to adjust the preset thresholds to improve the accuracy and efficiency of the adjustment.

[0046] The setting of preset thresholds is crucial to the performance of dual-energy-dissipating seismic dampers. Reasonable preset thresholds can ensure that the shear energy-dissipating modules are activated in a timely manner when needed, further dissipating seismic energy and improving the seismic performance of the bridge structure. At the same time, the setting of preset thresholds also needs to consider factors such as the service life, maintenance costs, and safety of the dampers to maximize the overall benefits.

[0047] like Figure 2 As shown, the positive Poisson's ratio energy dissipation component 2 is formed by welding a plurality of periodically arranged round-end shaped units 1. Several round-end shaped units 1 are periodically arranged in the horizontal and vertical directions. In this embodiment, there are two layers in the vertical direction, and each layer has four round-end shaped units 1 in the horizontal direction. The adjacent two round-end shaped units 1 are welded together, as shown in FIG. Figure 3 As shown, the cross section of each round-end unit 1 is an axisymmetric geometric configuration, including a central straight section and arc sections on both sides, and is made of low-yield steel with a yield point of 100-235 MPa.

[0048] The shear energy dissipation module consists of two frame units 3 arranged in parallel along the transverse direction of the bridge, such as Figure 4 As shown, the frame unit 3 is a rounded rectangular closed frame, which is made by rolling low-yield steel with a yield point of 100-235 MPa.

[0049] The dual-energy-dissipating seismic damper can be applied to different types of bridge structures under different site conditions. It is only necessary to adjust the number and size of the round-end units 1 and the frame units 3 according to actual conditions to adapt to the size and shape of different bridge structures.

[0050] See also Figure 1The linkage trigger mechanism includes a protrusion structure fixedly connected to the positive Poisson's ratio energy absorbing component 2 and a hole structure fixedly connected to the frame unit 3; when the compression amount of the positive Poisson's ratio energy absorbing component 2 does not reach a preset threshold value, the protrusion structure is not embedded in the hole structure on the frame unit 3, and the positive Poisson's ratio energy absorbing component 2 and the frame unit 3 remain separated; when the lateral compression amount of the positive Poisson's ratio energy absorbing component 2 reaches a preset threshold value, the protrusion structure is embedded in the hole structure, and the positive Poisson's ratio energy absorbing component 2 drives the frame unit 3 to generate shear deformation to consume shear energy.

[0051] Furthermore, a vertical baffle 5 and a vertical side plate 7 made of steel are welded to both sides of the positive Poisson's ratio energy dissipation component 2, and oblong holes are opened on the vertical side plates 7 for bolt connection.

[0052] The top plate 4 made of steel is welded and fixed to the top of the vertical baffle 5. The top plate 4 is fixedly connected to the bottom of the bridge beam by bolts B12. The frame unit 3 is welded to the bottom of the top plate 4. The side of the vertical side plate 7 is welded with a transverse push rod 9 made of steel. The other end of the transverse push rod 9 is welded with a lateral connecting plate 10 made of steel. The lateral connecting plate 10 is fixedly connected to the pier side of the bridge by bolts B12; the bolts B12 can be ordinary 8.8 grade bolts, or 10.9 grade or 12.9 grade high-strength bolts.

[0053] The bottom of the frame unit 3 is welded with a base plate 6 made of steel, and a hole structure is provided on the base plate 6; a raised structure cooperating with the hole structure is provided on the top of the L-shaped connecting plate 8, and the vertical plate of the L-shaped connecting plate 8 made of steel is fixedly connected to the vertical side plate 7 by bolts A11, and the bolts A11 are 10.9 or 12.9 grade high-strength bolts. The horizontal plate of the L-shaped connecting plate 8 is provided above the positive Poisson's ratio energy absorbing component 2, and a gap is left between the horizontal plate and the positive Poisson's ratio energy absorbing component 2, and the raised structure is provided on the top of the horizontal plate of the L-shaped connecting plate 8.

[0054] The damper is installed between the end of the main beam and the side of the pier. The seismic load is first transmitted to the transverse push rod 9 through the pier. The transverse push rod 9 pushes the vertical side plate 7 to compress or stretch the positive Poisson's ratio energy-absorbing component 2 to dissipate energy; under the action of a larger earthquake, the vertical deformation of the positive Poisson's ratio energy-absorbing component 2 pushes the L-shaped connecting plate protrusion to embed into the hole of the bottom plate 6, thereby pushing the bottom plate 6 to move, causing the frame unit 3 to undergo shear deformation and dissipate energy, thereby achieving the purpose of dual energy dissipation.

[0055] Furthermore, the dual energy dissipation anti-seismic damper is coated with anti-corrosion paint to ensure the durability of the energy dissipation component.

[0056] The installation process of the dual energy dissipation seismic damper is as follows:

[0057] First, according to the design requirements, prepare a sufficient number of circular end units, frame units, top plates, vertical baffles, bottom plates, vertical side plates, L-shaped connecting plates, horizontal push rods and high-strength bolts and other components, and conduct quality inspections on all components to ensure that there are no defects such as cracks and deformations; assemble the positive Poisson's ratio energy dissipation components, arrange multiple circular end units periodically in the horizontal and vertical directions, and connect them into a whole by welding to form a positive Poisson's ratio energy dissipation component, and weld the vertical baffles and vertical side plates on both sides of the positive Poisson's ratio energy dissipation component respectively; weld the bottom plate at the bottom of the frame unit, and set a hole structure on the bottom plate; install the linkage trigger mechanism, and the L-shaped The vertical plate of the connecting plate is fixedly connected to the vertical side plate by high-strength bolts, and a raised structure is set on the top of the horizontal plate of the L-shaped connecting plate; the overall assembly is carried out, the top plate is welded to the top of the vertical baffle, and the top plate is fixedly connected to the bottom of the bridge beam by bolts, and the frame unit is welded to the bottom of the top plate to ensure that the frame unit is aligned with the positive Poisson's ratio energy-absorbing component in the vertical direction; one end of the horizontal push rod is welded to the side of the vertical side plate, and the other end is welded to the lateral connecting plate, and the lateral connecting plate is fixedly connected to the pier side of the bridge by bolts; anti-corrosion paint is applied, and all components are painted with anti-corrosion paint to improve the durability of the damper.

[0058] The working principle of the dual energy dissipation anti-seismic damper:

[0059] When the seismic load is small, the bridge structure vibrates slightly, causing the positive Poisson's ratio energy-absorbing components to be compressed. Since the lateral compression of the positive Poisson's ratio energy-absorbing components does not reach the preset threshold, the linkage trigger mechanism does not start and the shear energy-absorbing module remains stationary. At this time, the positive Poisson's ratio energy-absorbing components dissipate seismic energy through compression deformation, protecting the bridge structure from damage.

[0060] When the seismic load is large, the bridge structure vibrates greatly, causing the positive Poisson's ratio energy-absorbing components to be significantly compressed. When the lateral compression of the positive Poisson's ratio energy-absorbing components reaches a preset threshold, the linkage trigger mechanism is activated, and the protrusion structure on the L-shaped connecting plate is embedded in the hole structure at the bottom of the frame unit; at this time, the positive Poisson's ratio energy-absorbing components drive the frame unit to produce shear deformation through the L-shaped connecting plate, further dissipating seismic energy. This dual energy dissipation mechanism significantly improves the safety of the bridge structure under seismic loads.

[0061] The positive Poisson's ratio material of the dual energy-absorbing seismic damper has good mechanical properties and stability, and can maintain stable energy absorption capacity during long-term use; compared with viscoelastic materials, positive Poisson's ratio materials are not affected by factors such as time dependence and environmental aging, and the energy absorption effect is more lasting and stable; by adjusting the number, size and arrangement of the round-end units, the positive Poisson's ratio energy-absorbing components can be adapted to bridge structures of different site categories. This flexibility enables the damper to be widely used in various types of bridge structures; the positive Poisson's ratio energy-absorbing components are welded from multiple round-end units, with a simple and clear structure, which is easy to manufacture and install; compared with the viscoelastic material used in patent CN111691566A, the positive Poisson's ratio material is not affected by time dependence and environmental aging, and the energy absorption effect is more stable and lasting; compared with the metal-variable friction composite damper used in patent CN114934607A, the positive Poisson's ratio material does not require complex mechanisms such as pre-tightening bolts, avoiding the problem of device failure caused by loose bolts.

[0062] The shear energy dissipation module of the dual energy dissipation seismic damper has high shear energy dissipation efficiency: the frame unit is a rounded rectangular closed frame design, which can effectively dissipate seismic energy through shear deformation under the action of medium and large earthquakes; the frame unit is made of steel, has good mechanical properties and stability, and can ensure that it will not be damaged under seismic loads; the frame unit structure is simple and clear, and is easy to manufacture and install through welding and other methods; compared with dampers with a single energy dissipation mode, the shear energy dissipation module further dissipates seismic energy through shear deformation, thereby improving the seismic performance of the bridge structure; compared with the shear energy dissipation part in other dual energy dissipation dampers, the shear energy dissipation module structure of the present invention is more stable and reliable, and is not easily affected by the external environment.

[0063] The linkage trigger mechanism of the dual energy-absorbing seismic damper accurately controls the start-up timing of the shear energy-absorbing module through a preset threshold value, ensuring that the shear energy-absorbing mechanism is activated only when needed; it is composed of a protrusion structure and a hole structure, and the structure is simple and clear and easy to manufacture and install. At the same time, the use of high-strength bolts ensures the stability and reliability of the connection; by adjusting the size of the preset threshold value, the linkage trigger mechanism can be adapted to the seismic load requirements of different intensity levels; compared with the trigger mechanisms in other dual energy-absorbing dampers, the linkage trigger mechanism of the present invention is more accurate and reliable, and can ensure that the shear energy-absorbing mechanism is activated only when needed; the structure is simple and clear and easy to manufacture and install, which reduces the manufacturing cost and maintenance difficulty.

[0064] The anti-corrosion coating of the dual energy-absorbing and seismic damper can prevent steel from rusting in harsh environments such as moisture and corrosion, thereby extending the service life of the damper; by applying the anti-corrosion coating, the maintenance cost and replacement frequency caused by rust can be reduced; the stability and reliability of the damper during long-term use are ensured, and the safety of the bridge structure is improved; compared with the damper not coated with anti-corrosion coating, the damper of the present invention has a longer service life and lower maintenance cost; the adaptability and stability of the damper in harsh environments are improved, and the safety of the bridge structure is ensured.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0066] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. Double energy dissipation anti-seismic damper, characterized in that: The invention comprises a positive Poisson's ratio energy absorbing component (2) and a shear energy absorbing module installed between the pier side and the beam bottom of a bridge, wherein both sides of the positive Poisson's ratio energy absorbing component (2) are fixedly connected to the pier side and the beam bottom respectively, and the shear energy absorbing module is fixedly connected to the beam bottom; a linkage trigger mechanism is provided between the positive Poisson's ratio energy absorbing component (2) and the shear energy absorbing module; when the lateral compression amount of the positive Poisson's ratio energy absorbing component (2) does not reach a preset threshold value, the positive Poisson's ratio energy absorbing component (2) and the shear energy absorbing module remain in a separated state; when the lateral compression amount of the positive Poisson's ratio energy absorbing component (2) reaches a preset threshold value, the positive Poisson's ratio energy absorbing component (2) drives the shear energy absorbing module through the linkage trigger mechanism to generate shear deformation for shear energy consumption; the positive Poisson's ratio energy absorbing component (2), the shear energy absorbing module and the linkage trigger mechanism are made of steel.

2. The dual energy dissipation anti-seismic damper according to claim 1, characterized in that: The positive Poisson's ratio energy dissipation component (2) is composed of a plurality of circular end-shaped units (1) fixedly connected to each other, wherein the plurality of circular end-shaped units (1) are periodically arranged in the horizontal and vertical directions, and the cross-section of the circular end-shaped unit (1) presents an axisymmetric geometric configuration, including a central straight section and circular arc sections on both sides.

3. The dual energy dissipation anti-seismic damper according to claim 1, characterized in that: The shear energy dissipation module is composed of at least two frame units (3) arranged in parallel along the transverse direction of the bridge, and the frame unit (3) is a rounded rectangular closed frame.

4. The dual energy dissipation anti-seismic damper according to claim 1, characterized in that: The linkage trigger mechanism comprises a protrusion structure fixedly connected to the positive Poisson's ratio energy consuming component (2) and a hole structure fixedly connected to the frame unit (3); when the compression amount of the positive Poisson's ratio energy consuming component (2) does not reach a preset threshold value, the protrusion structure does not embed into the hole structure on the frame unit (3), and the positive Poisson's ratio energy consuming component (2) and the frame unit (3) remain separated; when the lateral compression amount of the positive Poisson's ratio energy consuming component (2) reaches a preset threshold value, the protrusion structure embeds into the hole structure, and the positive Poisson's ratio energy consuming component (2) generates shear deformation by driving the frame unit (3) to consume shear energy.

5. The dual energy dissipation anti-seismic damper according to claim 4, characterized in that: The two sides of the positive Poisson's ratio energy dissipation component (2) are respectively fixedly connected with a vertical baffle (5) and a vertical side plate (7); a top plate (4) is fixedly connected to the top of the vertical baffle (5); the top plate (4) is fixedly connected to the bottom of the bridge beam; the frame unit (3) is fixedly connected to the bottom of the top plate (4); a transverse push rod (9) is fixedly connected to the side of the vertical side plate (7); the other end of the transverse push rod (9) is fixedly connected to a lateral connecting plate (10); and the lateral connecting plate (10) is fixedly connected to the pier side of the bridge.

6. The dual energy dissipation anti-seismic damper according to claim 5, characterized in that: The bottom of the frame unit (3) is fixedly connected to a bottom plate (6), and a hole structure is provided on the bottom plate (6).

7. The dual energy dissipation anti-seismic damper according to claim 6, characterized in that: The protruding structure is arranged on the top of the L-shaped connecting plate (8), the vertical plate of the L-shaped connecting plate (8) is fixedly connected to the vertical side plate (7), the horizontal plate of the L-shaped connecting plate (8) is arranged above the positive Poisson's ratio energy dissipation component (2), and the protruding structure is arranged on the top of the horizontal plate of the L-shaped connecting plate (8).

8. The dual energy dissipation anti-seismic damper according to claim 1, characterized in that: The positive Poisson's ratio energy dissipation component (2), the shear energy dissipation module and the linkage trigger mechanism are all coated with anti-corrosion paint.

9. The dual energy dissipation anti-seismic damper according to claim 2, characterized in that: The round-end unit (1) is made of steel with a yield point of 100-235 MPa.

10. The dual energy dissipation anti-seismic damper according to claim 7, characterized in that: The vertical plate of the L-shaped connecting plate (8) is fixedly connected to the vertical side plate (7) by bolts A (11). The bolts A (11) are high-strength bolts of grade 10.9 or 12.9, and oblong holes are provided on the vertical side plate (7).

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