KR100851650B1 - Apparatus for damping movement of structures - Google Patents

Abstract

The present invention relates to a vibration damping device for a structure having a damping effect of the vibration energy generated in the structure by the friction force generated in the contact surface with the friction material by introducing the arc-shaped lever to the pulley-type vibration damping device.

The present invention relates to a vibration damping device for a structure, comprising: a fixed plate coupled to an upper pillar of a structure, a pair of side plates coupled at right angles to the other end opposite to the one end of the fixed plate, and having a friction lever receiving space in the center thereof, the pair of Fastening means inserted into the lower side of the side plate to control the friction lever receiving space and the friction force, the fastening means is inserted into the upper friction lever receiving space, the friction projection is formed in both longitudinal lengths of the lower end of the arc-shaped plate, both ends The arc-shaped friction lever protruding from the friction lever receiving space and the pair of side plates and the fastening means and the friction lever is inserted, characterized in that it comprises a friction material formed on both side ends of the arc-shaped body upwardly bent.

Structure, Friction Force, Friction Material, Damper, Arc Type

Description

Vibration damping device for structures {APPARATUS FOR DAMPING MOVEMENT OF STRUCTURES}

1 is an exploded view of the vibration damping device of a structure according to the present invention;

Figure 2 is a front assembly completion of the left side and the side assembly completion of the right to see the assembly state of the vibration damping device of the structure according to the present invention,

3 is a front view showing a shape that operates when vibration is applied from side to side in a state in which the vibration damping device of the structure according to the present invention is installed in the structure,

Figure 4 is an energy absorption diagram showing the energy absorption area according to the frequency change of the vibration damping device of the structure according to the present invention,

5 is a shear strain reduction effect that can be seen in the empirical test results of the vibration damping device of the structure according to the present invention.

Explanation of symbols on the main parts of the drawings

1: vibration damping device of structure 9: cable

DESCRIPTION OF SYMBOLS 10 Structure 11 Fixing plate 13 A pair of side plate 15 Fastening means 17 Arc-type friction lever 18 Friction protrusion 19 Friction material 21 Fastening means hole

23: cable hole 41: bracket

The present invention relates to a device for vibration damping of a structure, and more particularly, by introducing an arc lever to a pulley type vibration damping device having a damping effect of vibration energy generated in a structure by frictional force generated at a contact surface with a friction material. A vibration damping device for a structure.

When the structural member is forced outside the horizontal, torsion or similar horizontal movement occurs. Torsion, in particular in buildings, structures or towers, may cause severe impacts or collapses on the condition of the structure.

In addition, when a vibration occurs due to combustion and wind in a large boiler structure of a power plant, which is a special facility, or a vibration occurs due to an earthquake, the ground on which the large structure is installed moves greatly, resulting in excessive movement of the structure, which damages the piping system connected to the inside of the boiler structure. The damage is very serious as it causes damage to various machines and electronic devices installed inside the steel structure.

For example, due to the nature of the boiler structure of a power plant consisting of more than 50m, the natural frequency of the structure ranges from 2㎐ to 0.7㎐. When the boiler structure having the low frequency characteristic has a vibration of 5 ㎐ or less due to combustion vibration, wind vibration, or seismic force, the boiler structure greatly increases vibration due to resonance, thereby greatly damaging the stability of the entire power plant system. Therefore, in order to solve such resonance, the natural frequency should be deviated from 1 ~ 2 감을 by increasing the rigidity of the structure. However, due to the large size of the boiler structure of the power plant, it is impossible to increase the rigidity by the addition of the structure. Therefore, there is no realistic countermeasure against horizontal vibration in a power plant that is not designed for the horizontal vibration of a boiler structure, and as a countermeasure, a separate horizontal vibration reduction device is necessary to reduce the vibration in the resonance region.

For this reason, many methods have been researched and developed to reduce vibrations generated in structures. Conventional vibration reduction methods have been used to improve the dynamic characteristics of a structure, to insulate vibration, and to attach a device capable of absorbing vibration energy to a building, that is, a method such as passive / active control.

Among these vibration reduction methods, a manual control method for installing vibration absorbing devices in a building has been widely used due to its effects, economic reasons, and good durability. Typical passive vibration control devices include friction dampers, braces, and elastic dampers. Among them, friction dampers are mainly used for piping systems such as power plants, and brace devices and viscoelastic dampers are used for large steel structures. However, friction dampers, braces and viscoelastic dampers are very complicated in structure, and the installation cost of the structure connecting the damper to the damper is very expensive due to repeated tension and compression when the damping device is operated. There are disadvantages that do not work.

Therefore, the structure is simpler than these damping devices, the tension force is always at work, easy to manufacture and install, and the cost is also urgently needed a vibration reduction device for the structure.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and is to solve the conventional technical problem by providing a vibration reduction device for a structure having a simple structure, easy fabrication and installation, and low cost.

In order to achieve the above object, the present invention is a vibration damping device of the structure, the fixed plate is coupled to the upper pillar of the structure, the friction lever receiving space is formed in the center is coupled at right angles to the other end opposite to the one end of the fixing plate A pair of side plates, a fastening means inserted through the lower side of the pair of side plates to control the friction lever receiving space and the friction force, is inserted into the upper friction lever receiving space of the fastening means, the length of both sides of the lower end of the arc-shaped plate Friction protrusions are formed, and both end portions are inserted between the arc-shaped friction lever protruding from the friction lever receiving space and the pair of side plates, the fastening means and the friction lever, and both side ends of the arc-shaped body are upwardly bent. It provides a vibration damping device of the structure, characterized in that it comprises I can.

The fixing plate is formed with two or more fastening means holes, characterized in that for coupling to the upper pillar of the structure by inserting a separate screw bolt.

In addition, the pair of side plates, at least two fastening means holes are formed at the bottom, the fastening means is characterized in that the length of the body includes a bolt and nut of at least a length penetrating through the pair of side plates.

The arc friction lever is characterized in that the cable hole is formed in each of the front end portion.

And, it characterized in that it further comprises one or more disk spring between the pair of side plates and the fastening means.

In addition, the arc-type friction lever, the thickness of the arc-shaped plate and the friction projection is the same, the thickness is characterized in that the 30mm ~ 40mm.

The friction material is in close contact with the lower surface of the arc-shaped body, the thickness is characterized in that 2mm ~ 3mm.

And, the friction material, characterized in that the width of the both ends of the upward bent is equal to the thickness of the arc-shaped friction projection or any one of 1mm ~ 2mm wider than the thickness of the friction projection.

The apparatus may further include a cable connecting the cable hole and the structure of the arc friction lever.

In addition, it characterized in that it further comprises a cable for connecting the cable hole and the structure of the arc-type friction lever and the turnbuckle for connecting the cable and the structure.

The apparatus may further include a cable connecting the cable hole and the structure of the arc friction lever, a bracket installed in the structure, and a turnbuckle connecting the cable and the bracket in the middle.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention described above in more detail.

1 is an exploded view of the vibration damping device of the structure according to the present invention, Figure 2 is a front assembly completion of the left side and the right side assembly assembling state of the vibration damping device of the structure according to the present invention 3 is a front view showing a shape that operates when vibration is applied from side to side in a state in which the vibration damping device of the structure according to the present invention is installed in the structure, and FIG. 4 is a frequency of the vibration damping device of the structure according to the present invention. Figure 5 is an energy absorption diagram showing the energy absorption area according to the change, Figure 5 is a shear strain reduction effect that can be seen the empirical test results of the vibration damping device of the structure according to the present invention.

Looking at the configuration of the vibration damping device of the structure according to the invention in detail with reference to Figures 1 and 2, the fixing plate 11 coupled to the upper pillar of the structure 10, the other end opposite the one end of the fixing plate 11 A pair of side plates 13 coupled to each other at right angles and having a friction lever receiving space formed therein, a fastening means 15 inserted through a lower portion of the pair of side plates 13 to adjust the friction lever receiving space and frictional force; The fastening means 15 is inserted into the upper friction lever receiving space, the friction protrusions 18 are formed in the longitudinal direction of both sides of the lower end of the arc-shaped plate body, both ends are arc-shaped friction levers protruding from the friction lever receiving space ( 17) and the pair of side plates 13, the fastening means 15 and the arc-shaped friction lever 17 is inserted between, the both ends of the arc-shaped body consisting of a friction material 19 is bent upwardly .

The fixing plate 11 is formed with two or more fastening means holes 21, and is coupled to the upper pillar of the structure by inserting a separate screw bolt. As shown in Figure 3 is fixed to the plate 11 is a vibration damping device of the structure 10 of the present invention is a pulley type, so as a base role thereof is preferably coupled to the center of the upper pillar of the structure (10).

In addition, the pair of side plates 13, at least two fastening means holes 21 are formed in the lower portion, the fastening means 15 is a length of the body of the bolt or more of the length penetrating the pair of side plates and It consists of a nut. As a result, when the energy generated in the structure 10 is transmitted to the vibration damping device 1, it is a means for directly controlling the amount of friction force capable of absorbing this energy.

In addition, the arc-type friction lever 17, the thickness of the arc-shaped plate and the friction projection 18 is the same, characterized in that the thickness is 30mm ~ 40mm, if the thickness is too thin less than 30mm and the friction area This has a disadvantage of narrowing, and if it exceeds 40mm, the manufacturing cost is burdened, because the weight is considerable at the time of installation, which is inconvenient. The arc-type friction lever 17 is supported in the vertical direction by the fastening means 15, and cable holes 23 are formed at both ends thereof, and the arc-type friction lever 17 is shown in FIG. 17 is connected to the structure 10 by a separate cable (9) is supported in the vertical direction by the fastening means 15 and is in close contact with the lower surface of the arc-type friction lever 17 while rotating from side to side by vibration The friction material 19 has a frictional force. Even when the arc-type friction lever 17 rotates left and right when vibration occurs, the fastening means 15 can support the arc-type friction lever 17 in a vertical direction so that the arc-type friction lever 17 is the side surface. Dropping out between the plates is prevented. At this time, the turnbuckle connecting the cable (9) and the structure 10, or further comprising a bracket (41) installed in the structure in order to more easily and firmly connect the structure 10 and the vibration damping device (1) Even better.

Preferably, the thickness of the friction material 19 is 2 mm to 3 mm. If the thickness is too thin, less than 2 mm, the life of the friction material is too short. If the thickness exceeds 3 mm, the friction material is burdened like a separate device. Because of this. It is preferable that the width of the both ends of the upward bent is equal to the thickness of the arc-type friction protrusion 17 or 1mm to 2mm wider than the thickness of the friction protrusion to accommodate all the friction surfaces of the arc-type friction protrusion 17.

In addition, further comprising one or more disk springs between the pair of side plates 13 and the fastening means 15 has the effect of making the fixing force stronger.

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EXAMPLE

This example installs a model structure (2m × 3.5m × 2.5m) with a total of 18 tons of concrete weight on top of the 6DOF hydraulic seismic generator owned by the Korea Institute of Machinery and Materials. The vibration reduction effect of the structure was investigated by measuring the acceleration, displacement and strain of each layer by inputting the signal.

As a result of the empirical test of Table 1, after the vibration damping device of the structure is installed, the damping size of the structure is increased by 5 times, and the displacement of each layer is 75%, the acceleration is 60%, and the shear strain is reduced by more than 85%. Proved.

       division Before installation after installing Attenuation Size 1.19% 5.95% Acceleration magnitude 0.297 g 0.17 g Displacement size 38 mm 9.5 mm Shear strain 205 32

The vibration damping device of the structure according to the present invention, unlike all vibration damping devices that are used in the case of the operation for energy absorption does not repeat the tension and compression, because only the tension force is always applied because the device or cable is very simple The installation cost is very low, and much thinner cables can be used than the conventional devices, and there are various effects that can solve the disadvantages of installation difficulties.

In addition, since the arc-type friction lever is in contact with the friction material to generate damping, a constant damping size can be obtained at all times regardless of temperature, and the energy absorption area does not change significantly even when the frequency is changed.

And, as a result of the empirical test, after the vibration damping device is installed according to the present invention, the damping size of the structure is increased 5 times, and the displacement of each layer is 75%, the acceleration is 60%, and the shear strain is reduced by more than 85%. It became.

Although the present invention has been described with reference to the above embodiments, it is merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (13)

In the vibration damping device of the structure, Fixing plate that one side is coupled to the upper portion of the structure; A pair of side plates spaced apart from each other on the other side of the fixing plate, and having a plurality of adjustment holes formed on one side thereof; Fastening means inserted into the adjustment hole to loosen and tighten the pressure applied to the pair of side plates; Supported in the vertical direction by the fastening means is inserted between the pair of side plates on the fastening means, the friction projection is formed long in the longitudinal direction of both sides of the lower end of the arc-shaped plate, and both ends are formed with cable holes An arc friction lever which protrudes out of the space defined by the pair of side plates; Interposed between the pair of side plates and the arc-type friction lever in contact with the lower surface and the side of the arc-type friction lever, the pressure applied to the side plate by the loosening and tightening of the fastening means is transmitted to adjust the friction force Friction material; And A cable connected to each of the cable holes and spaced in opposite directions to be connected to a lower portion of the structure, wherein the vibration force is generated by rotating the arc-type friction lever to the left and right by the tension force of the cable when vibration occurs. Vibration damping device of the structure to damp the vibrations by. delete delete delete The method according to claim 1, The fastening means is: Vibration damping device of a structure, characterized in that the length of the body includes a bolt having a length of more than penetrating through the pair of side plates and a nut coupled to the bolt. delete The vibration damping apparatus of claim 1, further comprising one or more disk springs between the pair of side plates and the fastening means. The method according to claim 1, wherein the arc friction lever, Vibration damping device of the structure, characterized in that the thickness of the arc-like plate and the friction protrusions, the thickness is 30mm ~ 40mm. The method according to claim 1, wherein the friction material, It is in close contact with the lower surface of the arc-type friction lever, the thickness of the vibration damping device of the structure, characterized in that 2mm ~ 3mm. The method according to claim 9, The friction material is: Vibration damping device of the structure, characterized in that the width of the both ends of the upwardly bent is equal to the thickness of the friction projections or 1mm ~ 2mm wider than the thickness of the friction projections. delete The method according to claim 1, And the cable and the structure are connected by a turnbuckle interposed between the cable and the structure. The method according to claim 12, The structure is further provided with a bracket, the vibration damping device of the structure, characterized in that the turnbuckle is interposed between the bracket and the cable.

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