JP3338920B2 - Seismic isolation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure in which a seismic isolation device such as laminated rubber is interposed between a lower structure such as a pillar and an upper structure such as a roof.

[0002]

2. Description of the Related Art For example, as a structural type of a large-scale structure having a pillar-free large space such as an arena or a stadium, a large-span dome-shaped roof is supported by columns provided around the structure. The most common format is the most common. In recent years, in the case of such a structure, a seismic isolation such as a laminated rubber for absorbing the vibration of the roof during an earthquake is provided between the pillar as the lower structure and the roof as the upper structure supported by the lower structure. Intermediate devices are being considered

[0003]

By the way, the large-scale structure as described above has a simple and clear structure in which the rigidity of each part of the dome-shaped roof and the rigidity of each of a large number of columns are uniform. If there is, the behavior of each part during an earthquake is clear, so such a structure is desired,
The shape of the roof is not a simple circular shape but irregular, or the number of columns supporting the roof is long and short, so the rigidity of each part of the roof and the rigidity of each column are not uniform. General. In this case, during an earthquake, the whole structure does not behave uniformly, but each part behaves individually and in a complicated manner.In such a case, seismic isolation devices such as laminated rubber are uniformly applied to each part. Even if it is arranged, there is a concern that the entire structure will behave more complicatedly during an earthquake, and it is assumed that an effective seismic isolation function cannot be obtained.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method for mounting a seismic isolation device such as laminated rubber between a lower structure such as a pillar and an upper structure such as a roof. The rigidity of the seismic isolation device installed on each part of the object is determined according to the rigidity of the lower structure and the rigidity of the upper structure at the installation position.
If the rigidity is relatively lower than the position of
Highly rigid seismic isolation devices are installed, and the lower and upper
When the rigidity of the structure is relatively higher than other positions
By installing relatively low-rigid seismic isolation devices there.
Further, the seismic isolation device and the overall rigidity of the lower structure and the upper structure are equalized in each part of the seismic isolation structure. In this case, it is conceivable to use a seismic isolation device whose rigidity can be adjusted arbitrarily and set the rigidity optimally according to the installation position.

[0005]

According to the present invention, for example, when a roof as an upper structure is erected on a pillar as a lower structure, if the rigidity of each column is not uniform, a relatively low rigidity is applied to the high rigidity column. Seismic devices will be installed, and relatively rigid seismic isolation devices will be installed on low rigidity columns. Also, if the rigidity of the roof is not uniform in each part, the seismic isolation device installed in the high rigidity area should have relatively low rigidity, and the seismic isolation device installed in the low rigidity area should have relatively high rigidity. I do. In this way, the rigidity of the seismic isolation device is adjusted to correspond to the rigidity of the lower structure and the upper structure at the installation position, and the overall rigidity of the seismic isolation device, the lower structure, and the upper structure is adjusted for this structure. By setting the parts to be equal, the rigidity of each part of the structure becomes uniform as a result, and the whole becomes uniformly and simply and shows clear behavior during an earthquake.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The seismic isolation structure of the present embodiment is a large-scale arena having a substantially elliptical planar shape, and a large number of pillars 1 arranged in an oval ring around the structure.
A pillar 1 and a roof 2 are constructed by erection of a substantially oval dome-shaped roof 2 (upper structure) on the (lower structure).
A laminated rubber 3 (seismic isolation device) is interposed between the two.

Since the seismic isolation structure of this embodiment has a substantially elliptical planar shape, its structural characteristics have directionality. That is, the dome-shaped roof tends to be deformed in the direction of collapse by its own weight, and if it is a circular roof, the deformation occurs evenly over the entire circumference. Is mainly deformed so as to expand in the minor axis direction, so that a large deformation naturally occurs in the minor axis direction as compared with the major axis direction.

For this reason, in the case where the roof 2 is simply supported by the columns 1 under the same conditions without taking any special measures as in the conventional general case, the columns 1 supporting the roof 2 are The shear stress received from the second 2 is not uniform, and a difference is generated. As a result, the column 1a provided along the major axis direction has the column 1b provided along the minor axis direction.
It will be more deformed than that. In other words,
The rigidity of the column 1a along the major axis direction is higher than the column 1b along the minor axis direction.
The imbalance that is relatively low compared to the rigidity of the structure occurs, and as a result, the stress generated in each column 1a, 1b and each part of the roof 2 during the earthquake becomes uneven, and the whole structure behaves in a complicated manner. Will do.

For this reason, in the present embodiment, such imbalance is eliminated by adjusting the rigidity of the laminated rubber 3 interposed between the column 1 and the roof 2, and each part of this structure behaves uniformly. Shall do. That is, in the present embodiment, the rigidity of the laminated rubber 3 interposed between each column 1 and the roof 2 is not made uniform, but the rigidity of the laminated rubber 3a installed on the column 1a along the long side direction is increased. Is set relatively high,
The rigidity of the laminated rubber 3b installed on the pillar 1b along the short side direction is set relatively low. In other words, the high rigidity laminated rubber 3a is arranged on the substantially low rigidity column 1a, and the low rigidity laminated rubber 3b is arranged on the high rigidity column 1b. The rigidity is equalized. As a result, in the structure of this embodiment, the rigidity of each part is equal,
Even in the event of an earthquake, a simple and clear structure is realized in which all parts behave uniformly.

By the way, the rigidity of the laminated rubber 3 is determined not only by the elastic coefficient of the rubber used but also by FIG.
The diameter D and the height H (the number of rubber laminating steps) shown in FIG. 4 vary depending on the diameter D or the height H, and the number of laminated rubbers 3 having the same specification increases. The rigidity increases as they are added. Therefore, the rigidity can be freely set to a desired value by arbitrarily setting the diameter D and the height dimension H. Therefore, not only the two kinds of laminated rubbers 3a and 3b are used but also the installation position. It is only necessary to use the corresponding laminated rubber 3 having an arbitrary rigidity, and it is sufficient to appropriately adjust the number of the laminated rubbers to be installed.

In the present invention, not only the laminated rubber 3 but also another type of seismic isolation device, for example, a steel damper 4 as shown in FIG. 4 can be used. The steel damper 4 absorbs vibration energy by plastically deforming the plurality of steel rods 5. In this case, as the length L of the steel rod 5 is reduced, the number of the steel rods 5 is increased. The rigidity increases as the distance increases, so that they may be appropriately adjusted according to the installation position.

Further, a seismic isolation device capable of freely adjusting the rigidity, for example, a seismic isolation device using an electrorheological fluid having a property that the viscosity changes when a voltage is applied is adopted and installed. At this time, the rigidity may be set to be optimal according to the installation position.

Further, the present invention is applicable not only to facilities such as arenas and stadiums, but also to various uses and various scale structures in general. When the seismic isolation device is interposed between a pillar and a roof, It goes without saying that the present invention can be applied not only to the case where it is provided between a foundation as a lower structure and a frame on an upper floor as an upper structure, for example.

[0014]

As described above, according to the present invention, the rigidity of the seismic isolation device interposed between the lower structure and the upper structure corresponds to the rigidity of the lower structure and the rigidity of the upper structure at the installation position. Decide on the lower structure and upper
When the rigidity of the structure is relatively lower than other positions
Installed a relatively high-rigidity seismic isolation device there.
The rigidity of the structure and superstructure is relatively higher than other positions
If it is difficult to install seismic isolation devices with relatively low rigidity,
The seismic isolation device and the overall rigidity of the lower structure and the upper structure are made uniform in each part of this seismic isolation structure, so that each part behaves uniformly even during an earthquake. A simple and clear structure is realized, and an excellent seismic isolation effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arena which is an embodiment of a seismic isolation structure of the present invention.

FIG. 2 is a partial elevational view of the same.

FIG. 3 is a view showing a laminated rubber which is an example of a seismic isolation device used in the present invention.

FIG. 4 is a view showing the same steel damper.

[Explanation of symbols]

 1 Pillar (lower structure) 2 Roof (upper structure) 3 Laminated rubber (seismic isolation device) 4 Steel damper (seismic isolation device).

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-257323 (JP, A) JP-A-5-306547 (JP, A) JP-A-4-14543 (JP, A) 66117 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 9/02 301 E04B 1/36

Claims (2)

(57) [Claims] A seismic isolation structure in which a seismic isolation device such as laminated rubber is interposed between a lower structure such as a pillar and an upper structure such as a roof, and is installed at each part of the seismic isolation structure. The rigidity of the seismic isolation device
It has been determined according to the rigidity of the rigidity and the superstructure of a lower structure in the installed position, the lower structure and upper structure
When the rigidity of the structure is relatively lower than other positions
Has a relatively high rigidity seismic isolation device installed
The rigidity of the structure and superstructure is relatively higher than other positions
If it is difficult to install a seismic isolation device with relatively low rigidity,
By being location, seismic isolation structure overall rigidity thereof isolator and the lower structure and upper structure is characterized by comprising evenly set in each part of the seismic isolation structure. 2. The seismic isolation structure according to claim 1, wherein the rigidity of the seismic isolation device is adjustable.