JP2006144476A - Base-isolating device and building structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolating device by which the load on a damping material of the base-isolating device and the cost are reduced, and the control over the optimum input in relation to the external force is materialized. <P>SOLUTION: The base-isolating device 1 comprises a connecting member 2 arranged to be substantially horizontal, a restoration material 3 and the damping material 4 which are connected to each other and are arranged on the upper layer of the connecting member 2, and the restoration material 5 and the damping material 6 which are connected to each other and are arranged on the lower layer of the connecting member 2 in a manner that the connecting member 2 is sandwiched. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seismic isolation device in a building structure and a building structure to which the seismic isolation device is applied, for example.

  Conventionally, it has been common practice to increase the rigidity of a building structure as a countermeasure against shaking such as an earthquake, but eventually, passive vibration control or active vibration control corresponding to the vibration itself will occur. Therefore, a vibration damping device such as a hybrid type vibration damping device that combines these is used. On the other hand, seismic isolation devices that insulate the ground from the building structure so that the vibration itself is not transmitted to the building structure have been proposed.

  As shown in FIG. 9, the seismic isolation device 20 is composed of a restoring material 21 in which thin steel plates and rubber sheets are laminated in layers, and a damping material 22, thereby receiving a shake such as an earthquake. In this seismic isolation device, long-term vibration may occur due to the influence of wind and the like during normal times, which may cause strangeness to the people inside the structure. A vibration damping material 22 is provided.

As described above, seismic isolation devices or vibration control devices or combinations thereof have been known, but in these devices, a high response acceleration suppression effect against vibration is exhibited to change from a middle layer structure to a higher layer structure. For example, a seismic isolation device is installed between the ground and the structure, and a vibration control device such as a vibration damper that is controlled on and off by an on-off valve by the control device is arranged on each floor of the structure. It is known that the horizontal rigidity of the lower layers of the lower layer in a high-rise structure is made low, making it a structure close to a seismic isolation structure, and a damping device is arranged on each lower floor (See Patent Documents 1 and 2).
JP 2000-240318 A JP 11-324392 A

  However, the above-described seismic isolation device has a problem that the load required for the damping device such as a damper is large and the cost increases. Also, in order to suppress response acceleration by controlling the damping damper with a computer, the overall configuration of the control system becomes complicated, making it difficult to use alone as a seismic isolation device, and considering the vibration characteristics of the building. It is necessary to design and there is little freedom of design.

Furthermore, the lower part of the building structure is intentionally weakened in its rigidity, and the damping device is arranged in a structure close to a seismic isolation structure in order to reduce the horizontal rigidity in the design of the structure itself. A special structure is required, and there are many design restrictions and the cost of building members increases. Moreover, since the design as a seismic isolation device cannot be performed independently of the structure, the degree of freedom in design is small.
The seismic isolation device and the building structure according to the present invention have been proposed in order to solve such problems.

The gist for solving the above-mentioned problems of the seismic isolation device according to the present invention is to achieve a connection member disposed substantially horizontally and connected to the upper layer with the connection member interposed therebetween. It consists of a restoring material and a damping material, and a restoring material and a damping material that are connected to the lower layer of the connecting member.
Also,
An upper connecting member is provided on the upper surface of the upper restoring material and the damping material, and a lower connecting member is provided on the lower surface of the lower restoring material and the damping material, thereby forming a replaceable unit;
The upper damping material and the lower damping material are each connected to a control device, or one of the damping materials is connected to the control device, and vibration information of the upper and lower connecting members is fed back. A damping coefficient value of the damping material is controlled by the control device;
Is included.

The gist for solving the above-mentioned problems of the building structure according to the present invention and achieving the object is that the seismic isolation device of the present invention is disposed between the foundation of the building structure and the ground, or It is that it was arrange | positioned between the foundation part of the building structure and the ground, and one or two or more intermediate layers.
Furthermore, when the seismic isolation device is disposed in the middle layer of the building structure, the seismic isolation device is disposed at a position that becomes a node of the vibration mode in the earthquake response of the building structure.

According to the seismic isolation device of the present invention and the building structure to which the seismic isolation device is applied, by dividing the seismic isolation device into multiple layers by dividing the restoration member and the damping material provided above and below the connecting member, It is easy to make the rigidity lower than that of the seismic isolation device, and its role is shared. That is, the lower-layer restoring material and the damping material are effective for vibration caused by a large earthquake and the like, and the upper-layer damping material is effective for a smile such as a wind. Accordingly, the degree of freedom for adjusting the upper and lower layers of the damping material is increased, and it becomes easy to reduce the load on the damping member and arbitrarily reduce the response of the high frequency component.
Unitizing the seismic isolation device facilitates transportation, construction work, replacement work, etc., and links the vibration control design on the building structure side with the seismic isolation design side on the seismic isolation device side in the design. There is no need, and the degree of freedom increases.
Furthermore, by controlling the damping coefficient value of the damping material by the control device that feeds back vibration information of the upper and lower connecting members, for example, acceleration and the like, it is more effective against external inputs such as earthquakes and winds. It becomes possible to change to an appropriate damping capacity, improving seismic isolation performance.
By disposing the seismic isolation device also in the intermediate layer of the building structure, it becomes possible to insulate vibrations between the upper part and the lower part of the structure, which has a great effect on damping. Further, if the building structure is disposed at a position that is mainly a node of a vibration mode in an earthquake response, a vibration such as an earthquake is greatly attenuated, and the insulation of the vibration is ensured.

  As shown in FIG. 1, a seismic isolation device 1 according to the present invention includes a connecting member 2 arranged substantially horizontally, and a restoration material arranged by connecting the upper and lower layers of the connecting member 2 up and down. 3 and the damping material 4, and the restoring material 5 and the damping material 6 that are connected to the lower layer of the connecting member 2. The seismic isolation device 1 is provided between the building structure 7 and the ground 8.

  The connecting member 2 connects the upper and lower restoring members 3 and 5 and the damping members 4 and 6, respectively, and is a flat plate made of steel, for example. The mass is adjusted as appropriate by making it the same as or smaller than the mass of the upper floor of the building structure.

  The restoration material 3 and the restoration material 5 are formed by laminating thin steel plates and rubber sheets, and both have the same rigidity.

  The damping material 4 and the damping material 6 are, for example, an oil damper, an elasto-plastic member, a magnetorheological fluid damper, etc. as passive damping devices. Regarding the setting of the damping coefficient of the damping material, the damping coefficient of the upper damping material 4 is made smaller than the damping coefficient of the lower damping material 6. Further, the damping coefficient of the lower-layer damping material 6 is made smaller or larger than the damping coefficient (β) of the conventional damping material 22, or appropriately set according to the design purpose, or a control device Is variable.

  When such a seismic isolation device 1 is provided between the building structure 7 and the ground 8, a horizontal deformation mode indicated by an absolute coordinate system when an earthquake is input as shown in FIG. It becomes. By making the damping coefficient of the upper damping material 4 smaller than the damping coefficient of the lower damping material 6, it is possible to sufficiently suppress fluctuation due to the influence of wind or the like.

  As shown in FIG. 3, as another embodiment, the upper layer damping material 4 and the lower layer damping material 6 are each connected to a control device (controller in the figure) 9, and the connecting member 2. The damping coefficient values of the damping materials 4 and 6 are controlled by the control device 9 that feeds back the acceleration as vibration information.

  The damping members 4 and 6 that are semi-active dampers can be set so as to most effectively suppress external forces such as seismic waves and winds by controlling the damping coefficient to be larger or smaller. is there. For example, in order to suppress the influence of wind or the like, the damping coefficient of the upper damping material 4 is set to “large”, or is set to “small” during an earthquake, or the damping coefficient of the lower damping material 6 is set to around the structure. If there is a sufficient gap with the retaining wall, set it to “small” to suppress acceleration, and conversely, if the gap with the retaining wall is small, set it to “large” to suppress displacement, and use the upper damping material 4 The attenuation coefficient is made "small" so as to suppress the acceleration.

  In some cases, one of the damping materials 4 and 6 may be connected to the control device 9 so as to be controlled. In this case, for example, the upper damping material 4 is made semi-active, and when there is a wind effect, the attenuation coefficient is set to “large”. Attenuate. In this way, the cost of the damping materials 4 and 6 can be reduced by making the damping materials 4 and 6 smaller than the damping coefficient of the damping material 22 of the conventional seismic isolation device. In addition, although the attenuation coefficient of the lower damping material 6 may be larger than the attenuation coefficient of the attenuation material 22, the cost may be increased, so that the gap between the retaining wall and the surrounding of the building structure is narrow. The design according to the severe environment is possible.

  Furthermore, as another embodiment, as shown in FIG. 4, the seismic isolation device 1 is disposed between the base portion of the building structure and the ground and at one or more intermediate levels. And when providing the said seismic isolation apparatus 1 in an intermediate | middle layer, it arrange | positions in the position used as the node 10 of the vibration mode in the earthquake response of the said building structure 7. FIG.

  As a result, for example, in the case of a high-rise building structure 7, the seismic isolation device 1 is disposed in an intermediate layer serving as a node, so that the vibration between the upper layer and the lower layer can be reliably insulated, and a large amount of control can be achieved. The vibration effect is demonstrated. FIG. 5 shows a schematic image of the horizontal deformation mode when the seismic isolation device 1 is disposed in the intermediate layer. In addition, by arranging the seismic isolation device 1 on the intermediate floor in this way, a node can be provided at an arbitrary hierarchical position of the high-rise building structure 7.

  As another embodiment, as shown in FIG. 6, an upper connection lid member 11 is provided on the upper surfaces of the upper restoration material 3 and the attenuation material 4, and the lower connection lid member 12 is provided on the lower surfaces of the lower restoration material 5 and the attenuation material 6. To provide a seismic isolation device 1a formed in a replaceable unit. The planar shape of the unit-type seismic isolation device 1a may be rectangular or circular. The upper and lower connecting lid members 11 and 12 are made of steel, for example.

  With such a unit-type seismic isolation device 1a, it is possible to freely calculate the number of units required to control the seismic isolation target building structure 7 with respect to the earthquake input. Design is possible, and by preparing a plurality of types of standard seismic isolation devices 1a corresponding to the magnitude of earthquakes in advance, it is possible to respond quickly to architectural design. The unitization also facilitates the transportation and transportation of the seismic isolation device, and the installation work of the seismic isolation device at the site becomes efficient.

The result in the Example compared with the seismic isolation apparatus 1 which concerns on this invention, and the conventional seismic isolation apparatus is shown. FIG. 7 shows a model of a building structure 7 to which the seismic isolation device 1 of the present invention is applied.
In the figure,
The symbol Cg0 is a damping coefficient of the lower damping material 6,
Reference sign Cg1 is an attenuation coefficient of the upper damping material 4,
The symbol Kg0 is the stiffness coefficient of the lower restoration material 5,
The symbol Kg1 is the stiffness coefficient of the restoring material 3 in the upper layer,
The symbol mg is the mass of the connecting member 2,
The symbols m1 to m12 are the masses of each floor,
Respectively.

For example, the result of comparing the acceleration of the roof with the conventional example when a Kobe earthquake of the Great Hanshin-Awaji Earthquake was input to this experimental model is the characteristic curve shown in FIG. In the conventional seismic isolation device 20 shown in FIG. 9, the same as the stiffness coefficient Kg of the restoring material 21, and the damping coefficient of the damping material 22 is β,
9A shows an example in which Cg0 = β × 1.4, Cg1 = β × 0.4, Kg1 = Kg0 = Kg (conventional example), and mg = m1 / 6.
FIG. 5B shows an example in which Cg0 = β × 1.6, Cg1 = β × 0.4, Kg1 = Kg0 = Kg (conventional example), and mg = m1 / 6.
FIG. 6C shows an example in which Cg0 = β × 2.0, Cg1 = β × 0.4, Kg1 = Kg0 = Kg (conventional example), and mg = m1 / 6. It can be seen that the acceleration of the seismic isolation device 1 (solid line) of the present invention is significantly suppressed as compared with the conventional seismic isolation device 20 (broken line in the figure).

1 is a schematic configuration diagram of a seismic isolation device 1 according to the present invention. This shows the shaking of the building structure 7 when the seismic isolation device 1 of the present invention is used. It is a schematic block diagram which shows the other Example which concerns on this invention. It is related with the other Example of this invention, and is a schematic block diagram at the time of arrange | positioning the seismic isolation apparatus 1 in an intermediate | middle layer. It is a schematic block diagram of the other Example. It is a longitudinal cross-sectional view of the seismic isolation apparatus 1a which concerns on the other Example. It is a schematic block diagram of the experimental model of the seismic isolation apparatus 1 which concerns on this invention. Although the experimental data are shown in the figure, they are characteristic curve diagrams (A), (B), and (C). It is a schematic block diagram of the example which uses the seismic isolation apparatus 20 which concerns on a prior art example.

Explanation of symbols

1,1a Seismic isolation device,
2 connecting members,
3 Upper layer restoration material,
4 Upper damping material,
5 Underlying restoration material,
6 Lower damping material,
7 Building structures,
8 Ground,
9 Control device (controller)
Tenth verse.
11 Upper connecting lid member,
12 Lower connecting lid member,
20 Conventional seismic isolation device,
21 Restoration material,
22 Damping material.

Claims (5)

A connecting member disposed substantially horizontally; a restoring material and a damping material disposed by being connected to an upper layer of the connecting member; a restoring material disposed to be connected to a lower layer of the connecting member; Consisting of damping material,
A seismic isolation device. An upper connecting member is provided on the upper surface of the upper layer restoring material and the damping material, and a lower connecting member is provided on the lower surface of the lower layer restoring material and the damping material, and is formed in a replaceable unit.
The seismic isolation device according to claim 1. The upper damping material and the lower damping material are connected to the control device, respectively, or one of the damping materials is connected to the control device, and the vibration information of the connecting member is fed back. A damping coefficient value of the damping material is controlled by a device;
The seismic isolation device according to claim 1 or 2. The seismic isolation device according to any one of claims 1 to 3 is disposed between the foundation portion of the building structure and the ground, or between the foundation portion and the ground of the building structure, or one or two. Arranged in the middle of the above,
A building structure characterized by When the seismic isolation device is arranged in the middle of the building structure, it is arranged at a position that becomes a node of the vibration mode in the earthquake response of the building structure,
The building structure according to claim 4.

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