JP6298402B2 - Partial seismic isolation structure - Google Patents

Description

  The present invention relates to a partial seismic isolation structure in which an attenuation device is installed at a strut portion of a frame.

  As shown in FIG. 5, the building structure 1 in which the damping device 4 (oil damper, friction damper, viscoelastic damper, low yield point steel damper, brace damper, or a damper that combines these) is installed in the strut portion. It is generally called a seismic control structure. The building structure 1 is a column beam frame that supports a floor with columns 2 and beams 3. And the strut portion of the frame formed by the column 2 and the beam 3, that is, the gusset plate 5 fixed to the column beam joint where the column 2 and the beam 3 are joined, Damping devices 4 are respectively interposed between the gusset plates 6 fixed to the upper part of the beam 3.

Japanese Patent Laid-Open No. 11-50689

  However, in the conventional damping structure, since the horizontal rigidity of the column 2 to which the damping device 4 is connected is large, the seismic force (horizontal force) is almost transmitted as the shearing force of the column 2 as shown by an arrow in FIG. Therefore, it could not be transmitted as the axial force of the damping device, and the damping effect could hardly be expected.

  In addition, a technique has been proposed in which a wall column sandwiching laminated rubber is provided in a frame frame, and a damping device is expanded and contracted by horizontal deformation of the laminated rubber so as to directly control vibration of the column beam frame (for example, Patent Documents). 1). Even in this case, since a shearing force is generated in the columns constituting the column beam frame, the horizontal deformation of the laminated rubber is extremely limited, the attenuation effect disappears, and the attenuation rate cannot be increased.

  The present invention has been made in view of such problems, and an object of the present invention is to efficiently transmit the seismic force (horizontal force) as the axial force of the damping device installed in the strut portion of the frame. The point is to provide a partial seismic isolation structure that can improve the damping effect.

The partial seismic isolation structure according to the present invention is configured as follows to achieve the above object.
The present invention is a column beam structure composed of a seismic isolation column sandwiching laminated rubber, a normal column not sandwiching laminated rubber, and a beam, and the laminated rubber is interposed in each seismic isolation column for each floor. Attenuating devices are installed in the struts of the frame that is mounted and is composed of the adjacent seismic isolation columns and the upper and lower beams.
Furthermore, the present invention is characterized in that the seismic isolation column and the normal column are spaced apart by one span or more.
Furthermore, the present invention is characterized in that the seismic isolation column and the normal column are spaced apart by 6 m or more.

  The partial seismic isolation structure of the present invention can effectively transmit the seismic force (horizontal force) as the axial force of the damping device installed in the strut portion of the frame frame, and can improve the damping effect.

It is the top view and axis group figure which show the structure of embodiment of the partial seismic isolation structure which concerns on this invention. It is a shaft group figure which shows the example of installation of the damping device shown in FIG. It is a top view which shows the other structural example of embodiment of the partial seismic isolation structure which concerns on this invention. It is a shaft assembly figure showing other examples of composition of an embodiment of a partial seismic isolation structure concerning the present invention. It is a shaft group figure which shows the conventional damping structure.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Note that, in the following embodiments, the same reference numerals are given to configurations showing functions similar to those of the prior art, and a part of the description is omitted.

  As shown in FIG. 1, the building structure 10 according to the present embodiment includes a seismic isolation column 20 that sandwiches the laminated rubber 7, a normal column 2 that does not sandwich the laminated rubber 7, and a column that includes the beam 3. It is a beam frame and has a partial seismic isolation structure in which the seismic isolation column 20 and the normal column 2 are mixed. The laminated rubber 7 has a structure in which thin steel plates and rubber sheets are alternately laminated, has high vertical rigidity, and extremely low horizontal rigidity. Moreover, since the laminated rubber 7 returns to its original position even if it is deformed, it functions as a seismic isolation bearing.

  As shown in FIG. 1A, the seismic isolation column 20 and the normal column 2 are regularly arranged at intersections according to the respective axis groups, that is, grid positions on the plane, as shown in FIG. Thereby, the seismic isolation column 20 and the normal column 2 are arranged at an interval of 1 span or more (usually 6 m or more).

  Moreover, the seismic isolation column 20 and the normal column 2 are structural members connected to the ground on the first floor, as shown in FIG. 1B. In the example shown in FIG. 1 (b), a laminated rubber 7 is interposed in the seismic isolation column 20 for each floor. And the damping device 4 (oil damper, friction damper, viscoelastic damper, low yield point steel damper, brace damper or these is added to the strut portion of the frame composed of the adjacent seismic isolation columns 20 and the upper and lower beams 3. Etc.) are installed.

  FIG. 2 shows an example in which the damping device 4 is installed at a strut portion of a frame frame composed of adjacent seismic isolation columns 20 and upper and lower beams 3. In this frame, the seismic isolation column 20 includes a laminated rubber 7, an upper upper seismic isolation column 21 across the laminated rubber 7, and a lower lower seismic isolation column 22 across the laminated rubber 7. The Damping device between a gusset plate 5 fixed to a beam-to-column joint where the upper seismic isolation column 21 and the upper beam 3 are joined, and a gusset plate 6 fixed to the upper part of the substantially center of the upper beam 3 4 are respectively interposed.

  The laminated rubber 7 is disposed between the upper seismic isolation column 21 and the lower seismic isolation column 22. Accordingly, the horizontal rigidity at the connection point of the damping device 4, that is, the column beam joint between the upper seismic isolation column 21 and the upper beam 3, is reduced, and the shearing force can be eliminated. Thereby, as indicated by arrows in FIG. 2, the seismic force (horizontal force) can be transmitted as the axial force (damping force) of the damping device 4 and the column axial force of the upper seismic isolation column 21. That is, since the shearing force at the beam-column joint between the upper seismic isolation column 21 and the upper beam 3 is deleted, the seismic force (horizontal force) is transmitted as the axial force of the damping device 4, and The vertical reaction force is transmitted as the column axial force of the upper seismic isolation column 21. In addition, since the laminated rubber 7 has high vertical rigidity, the column axial force transmitted to the upper seismic isolation column 21 is transmitted to the lower seismic isolation column 22 and the damping imparting effect is greatly improved.

  The building structure 10 is different from a normal seismic isolation structure in which the entire base portion of the building structure is separated from the ground by a laminated rubber bearing, and a seismic isolation column 20 in which a part of a column of a high-rise building is supported by the laminated rubber 7. This is a partial seismic isolation structure that forms a highly damped vibration system by installing the damping device 4 in the vicinity of the seismic isolation column 20. This partial seismic isolation structure is a structural system for relatively high-rise buildings. By changing the attenuation coefficient of the attenuation device 4, the primary natural period of the building structure 10 can be greatly changed at the same time. Therefore, the natural period is a relatively long period (2 seconds or more), and an attenuation rate of 15% or more can be given. As a result, it is possible to make earthquake-resistant high-rise buildings against long-period ground motion, and it is possible to greatly reduce the building response acceleration against irregular disturbances such as ground motion. Can also be prevented. In the partial seismic isolation structure, since all the columns are not the seismic isolation columns 20 (there are ordinary columns 2), there is no need to limit deformation against strong winds, and the structure is stable even when used in relatively high-rise buildings.

  In the present embodiment, the example in which the normal pillars 2 are arranged at the four corners at the grid position of 4 * 4 = 16 and the other 12 are the seismic isolation pillars 20 has been described. The normal column 2 and the seismic isolation column 20 only need to be regularly arranged. For example, as shown in the building structure 11 shown in FIG. Four may be normal pillars 2 and the other 12 may be seismic isolation columns 20. Moreover, the ratio of the number of the normal pillar 2 and the seismic isolation pillar 20 can be suitably set according to the structural strength and the natural frequency which are calculated | required. For example, as in the building structure 12 shown in FIG. 3B, the number of normal columns 2 may be eight and the other 12 may be seismic isolation columns 20 at a grid position of 4 * 5 = 20.

Moreover, it is not necessary to install the laminated rubber 7 in the seismic isolation column 20 and install the damping device 4 in each floor, and the floor where the laminated rubber 7 is installed in the seismic isolation column 20 and the damping device 4 is installed It can be set appropriately. For example, as in the building structure 13 shown in FIG. 4, it may be interposed laminated rubber 7 only odd floors.

As described above, the present embodiment is a column beam frame composed of the seismic isolation column 20 sandwiching the laminated rubber 7, the normal column 2 not sandwiching the laminated rubber 7, and the beam 3. The damping device 4 is installed in the strut portion of the frame that is composed of the adjacent seismic isolation columns 20 with the rubber 7 interposed therebetween and the upper and lower beams 3.
With this configuration, since the shearing force at the connection point of the damping device 4 can be eliminated, the seismic force (horizontal force) can be efficiently transmitted as the axial force of the damping device installed at the streak portion of the frame and the damping effect is improved. be able to

Furthermore, in this Embodiment, the seismic isolation column 20 and the normal pillar 2 are arrange | positioned at intervals of 1 span or more (normally 6 m or more).
With this configuration, the connecting portion shearing force of the damping device 4 can be eliminated without being affected by the horizontal rigidity of the normal column 2.

  Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in practicing the present invention. In each figure, the same numerals are given to the same component.

DESCRIPTION OF SYMBOLS 1 Building structure 2 Column 3 Beam 4 Damping device 5, 6 Gusset plate 7 Laminated rubber 10, 11, 12, 13 Building structure 20 Seismic isolation column 21 Upper seismic isolation column 22 Lower seismic isolation column

Claims (3)

It is a column beam structure composed of a seismic isolation column with laminated rubber, a normal column without laminated rubber, and a beam.
The MenShinhashira the laminated rubber is interposed each floor in, that said MenShinhashira fit Ri next to the attenuation device muscle違部fraction of Frames frame constituted by the top and bottom of the beam is installed Partial seismic isolation structure characterized by   The partial seismic isolation structure according to claim 1, wherein the seismic isolation column and the normal column are spaced apart by one span or more.   The partial seismic isolation structure according to claim 1, wherein the seismic isolation column and the normal column are spaced apart by 6 m or more.

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