JPH11270175A - Vibration damping method of connected structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively absorb energy of high-order mode amplitude components generated in collision and reduce response acceleration while reducing the impulse of connected structures during collision by increasing an operating time in collision between two structures and consistently absorbing vibration energy between two structures. SOLUTION: A center core 12 at a center is formed with low mass and high rigidity by using a continuously layered earthquake-proof wall. A peripheral building 14 encircled therearound at a predetermined small space S is constructed as a high-rise building with high mass and low rigidity by providing a multilayer floor slab. A collision damping means 20 is provided on the outer wall 18 of the center core 12 to gradually absorb impulse through the collision damping means 20 during collision between the center core 12 and the peripheral building 14. Both of the center core 12 and the peripheral building 14 are connected via a vibration energy absorbing means 30 to consistently absorb vibration between the center core 12 and the peripheral building 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for damping a connected structure in which two structures having different structural characteristics are damped by using both collision phenomena.

[0002]

2. Description of the Related Art Generally, as a vibration damping device for a structure such as a building, a TMD or an AMD in which a mass body is actively or passively moved is known. A horizontal control moment is generated. However, when attempting to suppress large vibrations with these devices, an excessively large additional mass is required to suppress the amplitude of the mass body below the allowable stroke of the device, making it difficult to achieve. There is also.

In such a case, the above-mentioned TMD and A
A vibration damping method for a connected structure in which parallel structural systems are connected to each other for damping, instead of being damped by the inertial force of an additional mass as in an MD or the like (see JP-A-6-58017). It is possible to adopt. That is, this method of damping a connected structure uses a spring and a damper to connect structural systems having different structural characteristics together to form a connected structure, and utilizes a difference in the natural period of the vibration of the two structures. To be damped.

A five-storied pagoda is an ancient building with excellent earthquake resistance. A multi-storied tower such as a five-storied pagoda is built around a core pillar erected in the center of the tower. It is thought that an excellent vibration damping function is exhibited by causing a collision between the pillar and the tower house. That is, the difference in swing between two structures (core pillar and tower house) having different structural characteristics such as mass and rigidity is used, and vibration is damped by a collision phenomenon between both structures.

[0005]

However, in such a conventional vibration damping method for a connected structure, the two structures that are close to each other so as to cause a collision are deformed by the deformation of the structure that gives the collision. However, the structure at the time of the collision has a greater deformation at that time than when no collision occurs. However, the maximum response occurrence times of the structural systems having different natural periods are generally different from each other, and the maximum response displacement of the structural system subjected to the collision is stochastically reduced. The collision phenomenon can be considered as a phenomenon in which a pulse-like impact force is applied to the mutual structures. In the case of a simple collision, the impact force is very large due to the short action time at the time of the collision, and there is a possibility that the collision may be locally damaged.

[0006] Another problem is how to suppress the deformation and distortion of the structure with respect to the earthquake resistance of the structure. At this time,
Most of the deformation of the structure is defined by the first-order mode. The vibration damping method by collision action converts kinetic energy oscillating at the first mode frequency into other high mode vibration energy by dispersing it into the force of a wide frequency component with the shock pulse force called collision. Will be. As a result, the first-order mode amplitude component becomes smaller, but the other higher-order mode components become larger than before the collision, and the deformation of the structure becomes smaller, but the response acceleration becomes larger.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has been made to extend the operation time of collision between two structures and to constantly absorb vibration energy between the two structures. It is an object of the present invention to provide a vibration damping method for a connected structure capable of effectively absorbing energy of a higher-order mode component generated at the time of a collision while reducing an impact force at the time of a collision of the connected structure.

[0008]

In order to achieve the above object, a method for damping a connected structure according to claim 1 of the present invention comprises:
Both structures having different structural characteristics such as mass and rigidity and having a first structure and a second structure which are constructed close to each other, and which oscillate due to vibration input caused by an earthquake, wind, or the like. In the vibration damping method for a connected structure using the collision phenomenon described above, at least one of the first structure and the second structure is provided with a collision buffer, and the collision damping means is provided when the first and second structures collide. The shock absorbing means acts to gradually absorb the impact force, and connects both the first structure and the second structure by vibration energy absorbing means, and the first and second structures are connected by the vibration energy absorbing means. Absorbs vibrations between them at all times.

According to a second aspect of the present invention, there is provided a vibration control method for a connecting structure, wherein one of the first structure and the second structure has low mass and high rigidity. A rigid flange is provided at the upper end of the other to cover the top of the other structure having high mass and low rigidity, and a sliding member allowing horizontal relative movement between the rigid flange and the top of the other structure is provided. The other structure supports the downward pressing force acting on the rigid flange while allowing the relative movement in the horizontal direction between the rigid flange and the other structure via the sliding member. I do.

Further, in the vibration damping method for a connecting structure according to a third aspect of the present invention, the collision damping means may be a single spring member or a single damper member, or a combination of a spring member and a damper member. Constitute.

Further, in the vibration damping method for a connecting structure according to a fourth aspect of the present invention, the vibration energy absorbing means is constituted by using a damper member.

The operation of the vibration damping method for a connected structure according to the present invention having the above structure will be described below. In claim 1, at least one of the first structure and the second structure acts on at least one of the first structure and the second structure. Since the shock absorbing means to absorb the impact force is provided,
By the collision buffering means, the operation time when the first structure and the second structure collide is lengthened, and the magnitude of the impact force can be reduced. In addition, since the first structure and the second structure are connected to each other and vibration energy absorbing means for constantly absorbing vibration between the first structure and the second structure is provided, it is possible to absorb a higher-order mode component generated upon collision. it can. Therefore, in the case where the structures having different structural characteristics are caused to collide with each other by using the difference in swing, and the connected structure including the first and second structures is damped, the structure on the side which has been subjected to the collision is used. Since the impact is alleviated by the collision buffer,
The collision location can be prevented from being locally damaged. Then, the amplitude component of the primary mode, which occupies most of the deformation of the structure due to the collision phenomenon, is reduced while being dispersed to the amplitude components of the other higher modes, thereby reducing the deformation of the structure. Since the next mode component can be easily absorbed by the vibration energy absorbing means, the response acceleration can be reduced.

According to a second aspect of the present invention, one of the first structure and the second structure having a low mass and a high rigidity is provided at an upper end portion of the other structure having a high mass and a low rigidity. A rigid flange that covers the top of the object is provided, and a sliding member that allows relative movement in the horizontal direction is interposed between the rigid flange and the top of the other structure. Since the downward pressing force acting on the rigid flange is supported by the other structure while allowing the relative movement in the horizontal direction with the other structure, a large horizontal force is input due to a large earthquake or the like. Thus, even if a large bending moment acts on one of the structures to bend and deform, the rigid flange portion moves horizontally along the top of the other structure via the sliding member, and the rigid flange portion The depressing force can be supported by the other structure . For this reason, a reaction force against the pushing-down force is generated in the other structure by the support portion, and a moment opposing the bending of the one structure is generated in the rigid flange by the reaction force. Therefore, the one structure pushes the upper end portion back in the direction opposite to the bending direction by the moment at this time, so that the bending deformation of the one structure can be suppressed. Therefore, since one structure is supported by the other structure, the rigidity (resistance) can be sufficiently maintained, and the rigidity ratio can be sufficiently ensured. Can be improved.

According to a third aspect of the present invention, the collision buffering means comprises a single spring member or a single damper member,
Because it was configured as a combined body of a spring member and a damper member,
The spring member absorbs impact energy by its resilient force, while the damper member absorbs impact energy by its damping force. For this reason, in any case, the impact energy is gradually absorbed, and the operation time can be extended.

Further, in the present invention, the vibration energy absorbing means is constituted by using a damper member.
The relative displacement between the structure and the second structure is absorbed by the damping force, and the vibration energy between the first and second structures can be effectively absorbed with a simple configuration.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show one embodiment of the vibration damping method for a connected structure according to the present invention. FIG. 1 is a sectional front view showing the entire structure of the connected structure, and FIG.
FIG. 3 is an enlarged sectional plan view of a main part of the connecting structure.

That is, the connecting structure 10 of the present embodiment is configured as a one-end closing type, and as shown in FIGS. 1 and 2, a center core 12 as a first structure standing in the center,
There is an outer peripheral building 14 as a second structure standing upright so as to surround it at a predetermined close interval S, and the center core 12 and the outer peripheral building 14 have different rigidity characteristics. The center core 12 is formed to have low mass and high rigidity by using multi-story earthquake-resistant walls, while the outer peripheral building 14 is constructed as a high-mass, low rigidity high-rise building by providing multilayer floor slabs 16, 16,. The center core 12 and the outer building 14 are formed at the same height.

Since the center core 12 and the outer building 14 have different rigidity characteristics and are close to each other, they are largely rocked by a vibration input caused by a large earthquake or a strong wind. Then, a method is employed in which one of the members collides with the other due to a difference between the respective vibrations, thereby damping the vibration.

In this embodiment, as shown in FIG. 3, collision buffer means 20 are provided on both sides of the outer wall 18 surrounding the center core 12 on four sides.
At the time of collision between the building and the outer building 14, the collision buffering means 20 acts to gradually absorb the impact force, while connecting both the center core 12 and the outer building 14 with the vibration energy absorbing means 30 to absorb the vibration energy. The vibration between the center core 12 and the outer building 14 is always absorbed by the means 30.

The collision buffering means 20 is arranged at a predetermined distance from the outer wall 18 of the center core 12 and a collision receiving plate 22 is disposed around the collision receiving plate 22 in a horizontal direction. It comprises a plurality of springs 24 for connecting the plate 22 to the outer wall 18 and a damper 26 for connecting the center of the collision receiving plate 22 to the outer wall 18.

The vibration energy absorbing means 30 is composed of a normal damper 32 using a viscous fluid such as oil as a working fluid, and a cylinder 32a of the normal damper 32 is attached to the center core 12 side and a piston rod is provided. 32b is attached to the outer building 14 side. Then, a damping force is generated in the normal contact damper 32 by a change in the interval S generated due to a difference in swing between the center core 12 and the outer peripheral building 14. Further, the cylinder 32a and the piston rod 32b can be attached to the center core 12 and the outer building 14 in opposite directions.

The collision damping means 20 and the vibration energy absorbing means 30 are provided for each floor of the outer building 14, respectively.
4 can cope with the shaking accompanying any deformation.

Therefore, in the vibration damping method of the connecting structure of the present embodiment, the collision damping means 20 is provided on the outer wall 18 of the center core 12, so that the center core 12 and the outer building 14 may collide. In doing so, the collision buffer 20
Is in contact with the inner wall 28 of the outer building 14. Then, the collision receiving plate 22 moves toward the center core 12 with the compression deformation of the spring 24, and the damper 26 is pushed in with this movement. For this reason, the resilience of the spring 24 and the damping force of the damper 26 act on the collision buffer 20 to receive the collision load while gradually absorbing the collision energy at the time of collision. Therefore, the load acting time when the center core 12 and the outer building 14 collide can be lengthened.

That is, the above-mentioned collision phenomenon can be considered as a phenomenon in which a pulse-like impact force is applied to each building. The impact force at this time is P, the action time is Δt, and the mass m 1 of the center core 12 is Changes in the velocity response of the system before and after the collision of the mass m2 of the
Assuming that x2, P = (m1..DELTA.x1 + m2..DELTA.x2) /
Δt... Therefore, the provision of the collision buffer means 20 makes it possible to lengthen (increase) the action time Δt of the collision phenomenon, and accordingly, the impact force P decreases.

On the other hand, a constant damper 32 provided between the center core 12 and the peripheral building 14 constantly controls the amplitude components of higher modes dispersed by the collision action between the center core 12 and the peripheral building 14. Since it can be absorbed, the response acceleration increased by the higher-order mode component can be reduced.

Therefore, in the case where the two structures 12, 14 collide with each other by using the difference in the swing of the structural characteristics of the center core 12 and the peripheral building 14 which are formed as the connecting structures, and the vibration is damped, Since the impact on the structure on the side of the collision is reduced by the collision buffering means 20, the collision location can be prevented from being locally damaged. The amplitude component of the first-order mode, which accounts for most of the deformation of the structure due to the collision phenomenon, is reduced while dispersing to other higher-order mode components, thereby reducing the deformation of the structure. Since the component can be easily absorbed by the normal contact damper 32, an increase in response acceleration can be suppressed.

In the present embodiment, since the spring 24 and the damper 26 are used as the collision buffering means 20, the impact energy can be reduced with a simple structure by adjusting the resilient force and the damping force in advance. It becomes possible to absorb gradually under optimal conditions. Also,
In this case, the collision buffering means 20 is configured by using both the spring 24 and the damper 26. However, the present invention is not limited to this, and may be configured by only the spring 24 or only the damper 26. Furthermore, the case where the collision buffering means 20 is provided on the outer wall 18 of the center core 12 is disclosed. However, the present invention is not limited thereto, and the collision buffering means 20 may be provided on the inner wall 28 of the outer peripheral building 14. Can also be provided.

Further, since the vibration energy absorbing means 30 is constituted by the normal damper 32, the relative displacement between the center core 12 and the peripheral building 14 can be effectively absorbed with a damping force, and the structure is simplified. be able to.

Incidentally, the collision buffering means 20 uses the collision receiving plate 22 as a mass body to give a predetermined mass so that a spring system composed of the collision receiving plate 22 and the spring 24 serves as a dynamic damper. It is possible to further improve the vibration damping effect of the structure on the side where the collision buffering means 20 is provided.

FIG. 4 is a cross-sectional front view of the overall structure of a connecting structure showing another embodiment. In this embodiment, the same components as those in the above embodiment are denoted by the same reference numerals, and redundant description will be omitted. .

That is, in the connecting structure 10a of this embodiment, the outer peripheral building 14 is attached to the upper end of the center core 12.
Truss 40 as a rigid flange covering top 14a
The lower surface of the hat truss 40 and the outer building 1
A sliding member 42 that allows horizontal movement between the two and the top 14a is interposed. And these sliding materials 4
2, allows the horizontal movement of the hat truss 40 and the outer peripheral building 14 in the horizontal direction, while supporting a downward pressing force acting on the hat truss 40.

The hat truss 40 is integrally mounted on the top of the center core 12 as a rectangular parallelepiped solid truss having a predetermined thickness. Even when a moment that resists the bending deformation of the center core 12 acts, It is configured to have rigidity capable of maintaining its shape. In this case, it is desirable to dispose the sliding material 42 at a position where the pillar 17 of the outer peripheral building 14 is formed.

Of course, in this embodiment, as in the above embodiment, the collision buffer 20 and the vibration energy absorbing unit 30 are provided in the gap S between the center core 12 and the outer building 14 as shown in FIG. Is provided.

Therefore, in the method for damping a connected structure according to the present embodiment, a large horizontal force P is input to the connected structure 10 due to a large earthquake or the like, whereby the center core 12 is largely bent and deformed. If the center core 12
The hat truss 40 provided at the upper end of the outermost building 14 moves horizontally along the top 14a of the outer peripheral building 14 via the sliding material 42, and generates a downward pushing force F. Since the pushing force F is supported by the outer building 14 via the sliding material 42, a reaction force R to the pushing force F is generated in the outer building 14 by the supporting portion. A moment M opposing the bending of the center core 12 is generated. For this reason, the upper end portion of the center core 20 is pushed back in the direction opposite to the bending direction by the moment M at this time, so that the bending deformation of the center core 20 can be suppressed.

Therefore, the center core 12 is supported by the outer peripheral building 14, thereby maintaining a sufficient rigidity (resistance) and a sufficient rigidity ratio. For this reason, the vibration damping effect of the connection structure 10 configured as one building closing type can be significantly improved in combination with the vibration damping effect of the collision buffering means 20 and the vibration energy absorbing means 30.

[0036]

As described in detail above, according to the present invention, the following excellent effects can be obtained.

According to a first aspect of the present invention, there is provided a vibration damping means for acting on at least one of the first structure and the second structure constituting the connection structure at the time of collision to absorb an impact force. And a vibration energy absorbing means for connecting both the first structure and the second structure and constantly absorbing vibration therebetween is provided. Therefore, the first structure and the second structure are connected by the collision damping means. The action time when an object collides can be lengthened, and the magnitude of the impact force can be reduced, and by the vibration energy absorbing means,
Higher-order mode components generated upon collision can be absorbed. Therefore, in the case where the structures having different structural characteristics are caused to collide with each other by using the difference in swing, and the connected structure including the first and second structures is damped, the structure on the side which has been subjected to the collision is used. Since the impact is alleviated by the collision buffer, it is possible to prevent the collision location from being locally damaged. The amplitude component of the first-order mode, which accounts for most of the deformation of the structure due to the collision phenomenon, is reduced while dispersing to other higher-order mode components, thereby reducing the deformation of the structure. Since the component can be easily absorbed by the vibration energy absorbing means, it is possible to suppress an increase in response acceleration.

According to a second aspect of the present invention, one of the first structure and the second structure having a low mass and high rigidity is provided at an upper end portion of the other structure having a high mass and low rigidity. A rigid flange that covers the top of the object is provided, and a sliding member that allows relative movement in the horizontal direction is interposed between the rigid flange and the top of the other structure. Since the downward pressing force acting on the rigid flange is supported by the other structure while allowing the relative movement in the horizontal direction with the other structure, the rigid flange is moved through the sliding member. The horizontal structure can move horizontally along the top of the other structure while supporting the pressing force of the rigid flange by the other structure. Therefore, since bending deformation of one structure can be suppressed, one structure can be sufficiently supported by the other structure to maintain a sufficient rigidity (resistance) and a sufficient rigidity ratio. As a result, the vibration damping effect of the connection structure can be further improved.

Further, in the third aspect, the collision buffer means may be a single spring member or a single damper member, or
Because it was configured as a combined body of a spring member and a damper member,
The spring member absorbs impact energy by its resilient force, while the damper member absorbs impact energy by its damping force. For this reason, in any case, the impact energy is gradually absorbed, and the operation time can be extended.

Furthermore, in claim 4, the vibration energy absorbing means is constituted by using a damper member.
The relative displacement between the first structure and the second structure is absorbed by the damping force, and the vibration energy between the first and second structures can be effectively absorbed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of an overall configuration of a connecting structure showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1 showing one embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional plan view of a main part of a connection structure showing one embodiment of the present invention.

FIG. 4 is a cross-sectional front view of the entire configuration of a connecting structure showing another embodiment of the present invention.

[Explanation of symbols]

 10, 10a connecting structure 12 center core (first structure) 14 outer peripheral building (second structure) 14a top 20 collision buffer 22 collision receiving plate 24 spring 26 damper 30 vibration energy absorbing means 32 constant damper 40 hat truss (Rigid flange) 42 Sliding material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16F 15/02 F16F 15/02 K 15/04 15/04 A

Claims (4)

[Claims] The present invention comprises a first structure and a second structure which are different in structural characteristics such as mass and rigidity and which are constructed close to each other, and oscillate by a vibration input caused by an earthquake, a wind or the like. A method of damping a connected structure using a collision phenomenon of both structures, wherein at least one of the first structure and the second structure is provided with a collision buffer, and the first and second structures are provided. At the time of collision of the object, the collision buffer acts to gradually absorb the impact force, and both the first structure and the second structure are connected by the vibration energy absorbing means. And a vibration damping method for a connected structure, wherein the vibration between the second structures is constantly absorbed. 2. An upper end of one of the first structure and the second structure having low mass and high rigidity,
A rigid flange is provided to cover the top of the other structure having high mass and low rigidity, and a sliding member that allows horizontal relative movement is interposed between the rigid flange and the top of the other structure, While allowing relative movement of the rigid flange portion and the other structure in the horizontal direction through the sliding member, a downward pressing force acting on the rigid flange portion is supported by the other structure. The method for damping a connected structure according to claim 1. 3. The control structure according to claim 1, wherein the collision buffering means is configured as a single spring member, a single damper member, or a combination of a spring member and a damper member. Shaking method. 4. The method according to claim 1, wherein the vibration energy absorbing means includes a damper member.