CN-121760282-B - Bridge damping device based on gravel friction energy consumption

Abstract

The invention belongs to the technical field of bridge engineering, and discloses a bridge damping device based on gravel friction energy consumption. Under the actions of earthquake, vehicle load and wind load, when the main beam moves in translation and rotation relative to the bridge pier, the bridge abutment, the bridge tower cross beam and the like, friction force is generated between the friction column, the friction rod and the gravel, and vibration energy is consumed. The bridge damping device adopts a gravel friction energy consumption mode, has the advantages of simple structure, definite stress, large friction force, low installation requirement, good durability, low manufacturing and maintenance cost, no clamping stagnation or void failure phenomenon, and meets the long-term service requirement of bridge engineering.

Inventors

• XU FUYOU
• FEI XIAODONG
• LU YAN
• ZHANG GUANGTAO
• QIU WENLIANG

Assignees

• 大连理工大学

Dates

Publication Date

20260508

Application Date

20260302

Claims (4)

1. 1. A bridge damping device based on gravel friction energy consumption is characterized by comprising a gravel box (1), a gravel box diaphragm plate (2), friction columns (3), friction rods (4), universal hinges (5), gravel (6) and a gravel cover plate (7), wherein the gravel box (1) is fixed on a bridge tower beam, a bridge pier or a bridge abutment, a plurality of vertical gravel box diaphragm plates (2) are arranged in the gravel box (1), a rigid frame connecting system is formed by the friction columns (3) arranged vertically and the friction rods (4) arranged horizontally, the rigid frame connecting system is arranged in the gravel box (1), the top ends of the friction columns (3) are connected with a bridge girder through the universal hinges (5), gravel (6) is filled in the gravel box (1), and the top surface of the gravel (6) is provided with the gravel cover plate (7) capable of penetrating through the friction columns (3); The lower end of the friction column (3) and the bottom surface of the friction rod (4) are made into a cone shape, the insertion depth of the friction column (3) is 0.3m-1.5m, and the distance between the lower end of the friction column (3) and the bottom plate of the gravel box (1) is 0.1m-0.2m; the periphery of the gravel cover plate (7) is provided with an upward edge-tilting structure, so that the gravel (6) is prevented from rolling to the top of the gravel cover plate (7).
2. 2. The bridge damping device based on gravel friction energy consumption according to claim 1, wherein the length and width of the gravel box (1) are 0.5m-5m, and the depth is 0.5m-2m.
3. 3. Bridge vibration damper based on gravel friction energy consumption according to claim 1, characterized in that the distance between adjacent gravel box diaphragms (2) is 0.2m-1m, the contact area between the gravel box diaphragms (2) and gravel (6) is not less than 20% of the area of the gravel box diaphragms (2).
4. 4. Bridge damping device based on gravel friction energy consumption according to claim 1, characterized in that the average particle size of the gravel (6) is 1cm-5cm.

Description

Bridge damping device based on gravel friction energy consumption Technical Field The invention belongs to the technical field of bridge engineering vibration control, and relates to a bridge damping device based on gravel friction energy consumption. Background The bridge can cause obvious vibration response between the bridge girder and the lower structure under the action of earthquake load, if the energy dissipation can not be effectively carried out, larger stress concentration is easily formed at the connecting part of the structure, and the overall safety, durability and normal use performance of the bridge structure are further affected. Therefore, the reasonable arrangement of the energy consumption and shock absorption device is an important technical means for improving the shock resistance and service reliability of the bridge. The common bridge damping device in the current engineering comprises a rubber support, a hydraulic or viscous damper, a metal yielding type energy dissipation member, a friction type energy dissipation device and the like. The rubber support mainly depends on elastic deformation of materials to realize shock isolation, ageing is easy to occur due to the influence of environmental factors in the long-term service process, damping risks exist in mechanical properties, the hydraulic or viscous damper is relatively complex in structure, high in requirements on tightness and manufacturing precision, high in early purchase and later maintenance cost, and easy to influence on damping properties due to temperature change, and the metal yield type energy consumption component usually depends on the materials to enter a plastic stage to realize energy consumption, is easy to produce accumulated damage after repeated stress, and influences the energy consumption stability and service life of the metal yield type energy consumption component. The friction type energy consumption device has intuitive energy consumption mechanism and relatively simple structure, and is applied to the field of bridge damping. The friction force mainly depends on friction coefficient and friction interface pressure, however, the existing friction type energy consumption device mainly adopts direct contact between components to generate sliding friction, which has the defects that the friction surface is smoother and smoother along with the time, the friction coefficient is obviously reduced, and the friction force is also reduced along with the friction surface, and the large-span bridge generates obvious displacement in the normal direction of the friction device under the action of dynamic load, so that the extremely large pressure can be generated, and the friction device and the bridge can be separated. Therefore, the problems of unstable energy consumption efficiency, insufficient adaptability, complete failure and the like of the devices are easy to occur under the complex stress working condition. In addition, when the bridge girder and the lower structure relatively move, a large additional bending moment is easily introduced by the partial friction device, so that the girder is not stressed easily, and the engineering application of the device is limited. Therefore, it is needed to provide a bridge damping device with simple structure, definite friction energy consumption mechanism, strong robustness, convenient replacement, economy and high efficiency, and controllable vibration with multiple degrees of freedom in horizontal and vertical directions, so as to meet the strict requirements of modern bridge engineering on vibration resistance. Disclosure of Invention Based on the problems, the invention provides a bridge damping device based on gravel friction energy consumption. The technical scheme of the invention is as follows: A bridge damping device based on gravel friction energy consumption comprises a gravel box 1, a gravel box diaphragm plate 2, friction columns 3, friction rods 4, universal hinges 5, gravel 6 and a gravel cover plate 7, wherein the gravel box 1 is fixed on a bridge tower beam, a bridge pier or a bridge abutment, a plurality of vertical gravel box diaphragm plates 2 are arranged inside the gravel box 1, the friction columns 3 which are vertically arranged and the friction rods 4 which are horizontally arranged form a rigid frame and are then placed into the gravel box 1, the top ends of the friction columns 3 are connected with a bridge girder through the universal hinges 5 (improving girder stress), gravel 6 is filled inside the gravel box 1, and the gravel cover plate 7 which can penetrate through the friction columns 3 is arranged on the top surfaces of the gravel 6. The length and width of the gravel box 1 are 0.5m-5m, and the depth is 0.5m-2m, so that the friction column 3 and the friction rod 4 can be fully contacted with the gravel 6 under the action of vibration in all directions, and the materials, the sizes, the forms and the quantity of the gravel box are not