JP3858432B2 - Vibration control method for linked structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration control method for a connected structure in which two structures having different structural characteristics are controlled using both collision phenomena.
[0002]
[Prior art]
In general, TMD and AMD that move a mass body actively or passively are known as vibration control devices for structures such as buildings, and these control moments in the horizontal direction at the top of the structure with respect to input vibration. Is supposed to be generated. However, when trying to suppress large vibrations with these devices, excessive additional mass is required to keep the mass body amplitude below the allowable stroke of the device, making it difficult to achieve this. There is also.
[0003]
Therefore, in such a case, a vibration control method for a connected structure in which vibrations are generated by connecting parallel structure systems, instead of using the inertial force of the added mass as in the above-described TMD, AMD, or the like. It is conceivable to employ (see JP-A-6-58017). In other words, the vibration control method for this connected structure uses a difference in the natural period of the vibration of the two structures, in which two parallel structures having different structural characteristics are connected by a spring and a damper to form a connected structure. To suppress vibration.
[0004]
By the way, there are five-storied pagodas in ancient buildings with excellent earthquake resistance, but multi-storied towers such as these five-storied pagoda are built around the core pillars standing in the center, and the pillars and towers are built when an earthquake occurs. It is considered that an excellent vibration control function is exhibited by causing a collision with the house. That is, the vibration is controlled by the collision phenomenon between the two structures using the difference in the shaking of the two structures (core pillar and tower house) having different structural characteristics such as mass and rigidity.
[0005]
[Problems to be solved by the invention]
However, in the conventional vibration damping method for a connected structure, the two structures that are close to each other so that a collision occurs can suppress the deformation of the structure on the side that gives the collision, but the structure has been subjected to the collision. The side structure is greatly deformed at that time as compared with the case where no collision occurs. However, the maximum response occurrence times of structure systems having different natural periods are generally different, and the maximum response displacement of a structure system that has received a collision is probabilistically reduced. The collision phenomenon can be understood as a phenomenon in which a pulse-like impact force is applied to the mutual structures. In the case of a simple collision, since the action time at the time of the collision is short, the impact force becomes very large, which may cause local damage of the collision point.
[0006]
Moreover, how to suppress the deformation distortion of a structure becomes a problem with respect to the earthquake resistance of the structure. At this time, the deformation of the structure is largely defined by the primary mode. The vibration control method by collision action is to convert the kinetic energy that fluctuates at the primary mode frequency into other high-order mode vibration energy by dispersing it into a force with a wide frequency component by impact pulse force called collision. Will be. As a result, the first-order mode amplitude component is reduced, but the other higher-order mode components are larger than before the collision, and the deformation of the structure is reduced, but the response acceleration is increased.
[0007]
Therefore, the present invention has been made in view of such conventional problems, and it is possible to lengthen the action time of a collision between two structures and to constantly absorb vibration energy between the two structures, thereby connecting the structures. An object of the present invention is to provide a vibration control method for a connected structure that can effectively absorb the energy of higher-order mode components generated at the time of collision while reducing the impact force at the time of collision.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, the vibration damping method for a connected structure according to claim 1 of the present invention includes a first structure and a first structure constructed in close proximity to each other, having different structural characteristics such as mass and rigidity. In the vibration control method for a connected structure that includes two structures and controls vibrations using the collision phenomenon of both structures that are swung by vibration input caused by an earthquake or wind, the first structure and the first structure Collision buffer means is provided in at least one of the two structures, and when the first and second structures collide, the collision buffer means acts to absorb the impact force gradually, and the first structure and the second structure. Both objects are connected by vibration energy absorbing means, and the vibration energy absorbing means is configured to constantly absorb vibration between the first and second structures . The collision buffer means includes a collision receiving plate, Collision receiving plate and first structure And a spring member that connects at least one of the second structures, and the collision receiving plate and the spring member are configured by giving a predetermined mass using the collision receiving plate as a mass body. The spring system is configured as a dynamic damper.
[0009]
Moreover, in the vibration damping method of the connection structure according to claim 2 of the present invention, of the first structure and the second structure, the upper end portion of one structure having low mass and high rigidity. In addition, a rigid flange that covers the top of the other structure with high mass and low rigidity 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. Then, while allowing the relative movement of the rigid body collar and the other structure in the horizontal direction through the sliding member, the downward pressing force acting on the rigid body collar is supported by the other structure.
[0010]
Furthermore, in the vibration damping method for a connecting structure according to claim 3 of the present invention, the collision buffering means is configured as a single spring member or a combined body of a spring member and a damper member.
[0011]
Furthermore, in the vibration damping method for a connecting structure according to claim 4 of the present invention, the vibration energy absorbing means is configured using a damper member.
[0012]
The operation of the vibration damping method for a connecting structure according to the present invention having the above-described configuration will be described below. In claim 1, at least one of the first structure and the second structure is acted upon at the time of collision to apply an impact force. Since the shock absorbing means for absorbing is provided, the action time when the first structure and the second structure collide with each other is increased by this collision buffering means, so that the magnitude of the impact force can be reduced. . In addition, since vibration energy absorbing means for connecting both the first structure and the second structure and constantly absorbing vibration between the two structures is provided, it is possible to absorb higher-order mode components generated when a collision occurs. it can. Therefore, when the structural structure having different structural characteristics is caused to collide with each other and the connected structure composed of both the first and second structures is damped, the structure on the side subjected to the collision Since the impact is alleviated by the collision buffer means, the collision location can be prevented from being locally damaged. The amplitude component of the primary mode, which accounts for most of the deformation of the structure due to the collision phenomenon, is reduced while being dispersed in the amplitude component of the other higher-order modes to reduce 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. The collision buffer means includes a collision receiving plate, and a spring member that connects the collision receiving plate and at least one of the first structure and the second structure, and the collision receiving plate. Since the spring system constituted by the collision receiving plate and the spring member is configured as a dynamic damper by giving a predetermined mass as a mass body, the collision buffering means includes the first and second structures. In addition to the function of gradually absorbing the impact force at the time of collision, the spring system composed of the collision receiving plate and the spring member functions as a dynamic damper.
[0013]
Moreover, in Claim 2, the top part of the other structure having high mass and low rigidity is provided at the upper end of one structure having low mass and high rigidity among the first structure and the second structure. And a rigid member that covers the rigid body and the other structure is interposed between the rigid member and the top of the other structure via a sliding member that allows relative movement in the horizontal direction. While allowing the relative movement in the horizontal direction with the object and supporting the downward pressing force acting on the rigid body collar with the other structure, a large horizontal force is input due to a large earthquake, etc. Even if a large bending moment acts on one structure and is about to be bent and deformed, the rigid body flange moves horizontally along the top of the other structure via the sliding member, and the pressing force of the rigid body collar is reduced. It can be supported by the other structure. For this reason, a reaction force against the pressing force is generated in the other structure by the support portion, and a moment that opposes the bending of the one structure is generated in the rigid body collar due to the reaction force. For this reason, the above-mentioned one structure can push back the upper end portion in the direction opposite to the bending direction by the moment at this time, and consequently, the bending deformation of this one structure can be suppressed. Therefore, since one structure can be sufficiently supported by the other structure to maintain sufficient rigidity (resistance force) and sufficiently ensure its rigidity ratio, the vibration damping effect of the connected structure can be further increased. Can be improved.
[0014]
According to a third aspect of the present invention, since the collision buffer means is configured as a single spring member or a combined body of a spring member and a damper member, the spring member absorbs impact energy by its elastic force, while the damper member Then, the impact energy is absorbed by the damping force. For this reason, in any case, the impact energy is gradually absorbed, and the action time can be lengthened.
[0015]
Further, in the present invention, since 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 first structure is made simple. The vibration energy between the second structures can be effectively absorbed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a vibration damping method for a connecting structure according to the present invention, FIG. 1 is a sectional front view showing the overall structure of the connecting structure, and FIG. 2 is a sectional view taken along line AA in FIG. FIG. 3 is an enlarged cross-sectional plan view of the main part of the connection structure.
[0017]
That is, the connection structure 10 of the present embodiment is configured as a single building termination type, and as shown in FIGS. 1 and 2, a center core 12 as a first structure standing at the center and a predetermined area around it. And the outer peripheral building 14 as a second structure erected so as to be surrounded by the adjacent space S, and the center core 12 and the outer peripheral building 14 have different rigidity characteristics. The center core 12 is formed as a low-mass and high-rigidity using multi-layer earthquake-resistant walls, while the outer peripheral building 14 is constructed as a high-mass and low-rigidity high-rise building with multi-layered floor slabs 16, 16. The center core 12 and the outer peripheral building 14 are formed at the same height.
[0018]
The center core 12 and the outer peripheral building 14 have different rigidity characteristics and are close to each other. Therefore, when each of the center core 12 and the outer peripheral building 14 is greatly swung by a vibration input caused by a large earthquake or strong wind, A method is adopted in which vibration is controlled by one of the two colliding with the other due to the difference in vibration.
[0019]
Here, in the present embodiment, as shown in FIG. 3, collision buffer means 20 is provided on both sides of the outer wall 18 surrounding the four sides of the center core 12, and when the center core 12 and the outer peripheral building 14 collide, the collision buffer 20 is provided. While the means 20 acts to absorb the impact force gradually, the center core 12 and the outer peripheral building 14 are both connected by the vibration energy absorbing means 30, and the vibration energy absorbing means 30 connects the center core 12 and the outer peripheral building 14. It is designed to absorb vibrations at all times.
[0020]
The collision buffering means 20 is arranged with a collision receiving plate 22 arranged at a predetermined interval from the outer wall 18 of the center core 12 and arranged around the collision receiving plate 22 in the horizontal direction. A plurality of springs 24 coupled to the outer wall 18 and a damper 26 connecting the central portion of the collision receiving plate 22 and the outer wall 18 are configured.
[0021]
The vibration energy absorbing means 30 is composed of a constant damper 32 using a viscous fluid such as oil as a working fluid. A cylinder 32a of the constant damper 32 is attached to the center core 12 side, and a piston rod 32b is arranged on the outer periphery. It is attached to the building 14 side. A damping force is generated in the permanent damper 32 due to a change in the interval S caused by the difference in the shaking between the center core 12 and the outer peripheral building 14. The cylinder 32a and the piston rod 32b can be attached to the center core 12 and the outer peripheral building 14 in the opposite directions.
[0022]
By the way, the collision buffering means 20 and the vibration energy absorbing means 30 are provided for each floor of the outer building 14 so as to be able to cope with any deformation of the center core 12 and the outer building 14 with any deformation. .
[0023]
Therefore, in the vibration damping method for a connected structure according to the present embodiment, the collision buffer means 20 is provided on the outer wall 18 of the center core 12, so that the center core 12 and the outer peripheral building 14 are about to collide. The collision receiving plate 22 of the collision buffer means 20 is brought into contact with the inner wall 28 of the outer peripheral building 14. Then, the collision receiving plate 22 moves in the direction of 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 elastic force of the spring 24 and the damping force of the damper 26 act on the collision buffering means 20 to receive the collision load while gradually absorbing the collision energy at the time of the collision. Therefore, the load acting time when the center core 12 and the outer peripheral building 14 collide can be lengthened.
[0024]
That is, the above-mentioned collision phenomenon can be regarded as a phenomenon in which a pulse-like impact force is applied to each other's buildings. At this time, the impact force is P, the action time is Δt, the mass m1 of the center core 12 and the outer peripheral building. Let Δx1 and Δx2 be the change in the velocity response of the system before and after the collision of 14 mass m2.
P = (m 1 · Δx 1 + m 2 · Δx 2) / Δt (1) Accordingly, 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.
[0025]
On the other hand, the continuous damper 32 provided between the center core 12 and the outer peripheral building 14 always absorbs the higher-order mode amplitude component dispersed by the collision action between the center core 12 and the outer peripheral building 14. Therefore, the response acceleration increased by the higher-order mode component can be reduced.
[0026]
Therefore, when the center core 12 configured as a connected structure and the peripheral building 14 are used for vibration suppression by causing the structures 12 and 14 to collide with each other by using the difference in the structural characteristics, the collision is received. Since the impact of the structure on the other side is mitigated by the collision buffering means 20, the collision location can be prevented from being locally damaged. The amplitude component of the primary mode, which accounts for most of the deformation of the structure due to the collision phenomenon, is reduced while being dispersed in the other higher-order mode components to reduce the deformation of the structure. Since the component can be easily absorbed by the constant damper 32, the response acceleration can be suppressed from increasing.
[0027]
By the way, in the present embodiment, the spring 24 and the damper 26 are used as the collision buffering means 20, so that the impact energy and the damping force are adjusted in advance, so that the impact energy can be optimally adjusted with a simple configuration. It becomes possible to absorb gradually down. In this case, the collision buffering means 20 is constituted by the combined use of the spring 24 and the damper 26. However, the present invention is not limited to this, and it can be constituted by only the spring 24 or only the damper 26. Furthermore, although the case where the collision buffering means 20 is provided on the outer wall 18 of the center core 12 has been disclosed, the present invention is not limited to this, and it may be provided on the inner wall 28 of the outer peripheral building 14. It can also be provided.
[0028]
Further, since the vibration energy absorbing means 30 is constituted by the permanent damper 32, the relative displacement between the center core 12 and the outer peripheral building 14 can be effectively absorbed with a damping force, and the configuration can be simplified. .
[0029]
By the way, the collision buffer means 20 configures a spring system composed of the collision receiving plate 22 and the spring 24 as a dynamic damper by giving a predetermined mass using the collision receiving plate 22 as a mass body. Therefore, the vibration damping effect of the structure on the side where the collision buffer means 20 is provided can be further improved.
[0030]
FIG. 4 is a cross-sectional front view of the overall configuration of a connection structure showing another embodiment. This embodiment will be described with the same reference numerals assigned to the same components as those of the above-described embodiment, without redundant description.
[0031]
That is, in the connection structure 10a of this embodiment, a hat truss 40 is provided as a rigid saddle that covers the top 14a of the outer peripheral building 14 at the upper end of the center core 12, and the lower surface of the hat truss 40 and the outer peripheral building are provided. Between the top 14a of 14, a sliding material 42 that allows horizontal movement between the two is interposed. Then, the downward pressing force acting on the hat truss 40 is supported while allowing the horizontal movement of the hat truss 40 and the outer peripheral building 14 through the sliding material 42 in a horizontal direction.
[0032]
The hat truss 40 is integrally attached to the top of the center core 12 as a rectangular solid truss having a predetermined thickness. Even when a moment that resists bending deformation of the center core 12 acts, the hat truss 40 has a sufficient shape. It is configured with rigidity that can be held. In this case, it is desirable to arrange the sliding material 42 corresponding to the formation position of the pillar 17 of the outer peripheral building 14.
[0033]
Of course, also in this embodiment, the collision buffer means 20 and the vibration energy absorbing means 30 are provided in the gap S between the center core 12 and the outer peripheral building 14 as shown in FIG. .
[0034]
Therefore, in the vibration damping method for a connection structure according to the present embodiment, when a large horizontal force P is input to the connection structure 10 due to a large earthquake or the like, and the center core 12 is about to be greatly bent and deformed by this, The hat truss 40 provided at the upper end portion of the center core 12 moves horizontally along the top portion 14a of the outer peripheral building 14 via the sliding material 42, and generates a downward pressing force F. Since the pressing force F is supported by the outer peripheral building 14 via the sliding material 42, a reaction force R against the pressing force F is generated in the outer peripheral building 14 by the supporting portion, and the reaction force R causes the hat truss 40 to A moment M opposite to the bending of the center core 12 is generated. For this reason, 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.
[0035]
Accordingly, the center core 12 is supported by the outer peripheral building 14 so that the rigidity (resistance force) is sufficiently maintained, and the rigidity ratio can be sufficiently secured. For this reason, the vibration damping effect of the connecting structure 10 configured as a single building termination type can be remarkably improved in combination with the vibration damping effect by the collision buffer means 20 and the vibration energy absorbing means 30.
[0036]
【The invention's effect】
As described above in detail, according to the present invention, the following excellent effects can be obtained.
[0037]
The vibration damping method for a connected structure according to claim 1 is provided with at least one of the first structure and the second structure constituting the connected structure provided with a collision buffer means that acts at the time of collision and absorbs the impact force. Since the vibration energy absorbing means is provided to connect both the first structure and the second structure and always absorb the vibration between them, the first structure and the second structure are separated by the collision buffer means. The action time at the time of collision can be lengthened, and hence the magnitude of impact force can be reduced, and higher-order mode components generated at the time of collision can be absorbed by the vibration energy absorbing means. Therefore, when the structural structure having different structural characteristics is caused to collide with each other and the connected structure composed of both the first and second structures is damped, the structure on the side subjected to the collision Since the impact is alleviated by the collision buffer means, the collision location can be prevented from being locally damaged. The amplitude component of the primary mode, which accounts for most of the deformation of the structure due to the collision phenomenon, is reduced while being dispersed in the other higher-order mode components to reduce the deformation of the structure. Since the component can be easily absorbed by the vibration energy absorbing means, an increase in response acceleration can be suppressed. The collision buffer means includes a collision receiving plate, and a spring member that connects the collision receiving plate and at least one of the first structure and the second structure, and the collision receiving plate. Since the spring system constituted by the collision receiving plate and the spring member is configured as a dynamic damper by giving a predetermined mass as a mass body, the collision buffering means includes the first and second structures. In addition to the function of gradually absorbing the impact force at the time of collision, the spring system composed of the collision receiving plate and the spring member functions as a dynamic damper.
[0038]
Moreover, in Claim 2, the top part of the other structure having high mass and low rigidity is provided at the upper end of one structure having low mass and high rigidity among the first structure and the second structure. And a rigid member that covers the rigid body and the other structure is interposed between the rigid member and the top of the other structure via a sliding member that allows relative movement in the horizontal direction. Since the downward pressing force acting on the rigid body collar is supported by the other structure while allowing relative movement in the horizontal direction with the object, the rigid body collar is supported by the other structure via the sliding member. While moving horizontally along the top of the object, the pressing force of the rigid body collar can be supported by the other structure. Accordingly, since bending deformation of one structure can be suppressed, one structure can be sufficiently supported by the other structure to sufficiently maintain rigidity (resistance force) and ensure a sufficient rigidity ratio. This can further improve the vibration damping effect of the connected structure.
[0039]
Further, in the present invention, since the collision buffer means is configured as a single spring member or a combined body of the spring member and the damper member, the spring member absorbs impact energy by its elastic force, while the damper member Then, the impact energy is absorbed by the damping force. For this reason, in any case, the impact energy is gradually absorbed, and the action time can be lengthened.
[0040]
Furthermore, in claim 4, since the vibration energy absorbing means is configured by using a damper member, the relative displacement between the first structure and the second structure is absorbed by the damping force, and a simple configuration is achieved. The vibration energy between the first and second structures can be effectively absorbed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view of the overall configuration of a connection structure showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 showing an embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional plan view of a main part of a connection structure showing an embodiment of the present invention.
FIG. 4 is a cross-sectional front view of the overall configuration of a connection structure showing another embodiment of the present invention.
[Explanation of symbols]
10, 10a Connection structure 12 Center core (first structure)
14 Perimeter building (second structure)
14a Top 20 Collision buffering means 22 Collision receiving plate 24 Spring 26 Damper 30 Vibration energy absorbing means 32 Constant damper 40 Hat truss (rigid buttocks)
42 Sliding material

Claims (4)

Both structures having different structural characteristics such as mass and rigidity, and having a first structure and a second structure constructed close to each other, and oscillating by vibration input caused by earthquakes, winds, etc. In a vibration control method for a connected structure that uses the collision phenomenon of
Collision buffer means is provided in at least one of the first structure and the second structure, and when the first and second structures collide, the collision buffer means acts to absorb the impact force gradually and The first structure and the second structure are both connected by vibration energy absorbing means, and the vibration energy absorbing means is configured to constantly absorb vibration between the first and second structures ,
The collision buffer means is
Collision catcher, and
A spring member connecting the collision receiving plate and at least one of the first structure and the second structure;
A damping system for a connected structure, characterized in that a spring system constituted by the collision receiving plate and the spring member is configured as a dynamic damper by giving a predetermined mass using the collision receiving plate as a mass body. Method.   Of the first structure and the second structure, a rigid body covering the top of the other structure having high mass and low rigidity is provided at the upper end of the one structure having low mass and high rigidity. In addition, a sliding member allowing relative movement in the horizontal direction is interposed between the rigid body collar and the top of the other structure, and the horizontal relative between the rigid body collar and the other structure is interposed via the sliding member. 2. The vibration damping method for a connected structure according to claim 1, wherein the downward pressing force acting on the rigid body collar is supported by the other structure while allowing the movement. The method for damping a connected structure according to claim 1 or 2, wherein the collision buffer means is configured as a single spring member or a combined body of a spring member and a damper member.   The method for damping a connected structure according to claim 1 or 2, wherein the vibration energy absorbing means is configured using a damper member.

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