JP2018119329A - Building base isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building base isolation structure with a base isolation layer that is less subject to constraints on building plans and that does not require complex base isolation devices, for building base isolation structures used for middle and high rise buildings.SOLUTION: A building base isolation structure having an upper structure 3 on an upper part of a base isolation layer is provided. In the base isolation layer, when the upper structure 3 of a floor FL3 immediately above the base isolation layer is viewed in a plan view, a base isolation device 8 is provided at least just below a pillar 22 of a projected corner portion 10, and an insulation space is provided just under the pillar 23 adjacent to the projected corner portion 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a building seismic isolation structure having a seismic isolation device under a building foundation or on a building intermediate floor. Specifically, it is a building seismic isolation structure in which seismic isolation devices are not installed directly under all columns, but are installed only directly under some columns including the outer peripheral columns of buildings at the corners. .

In recent years, buildings with seismic isolation devices such as laminated rubber bearings have been widely constructed in order to prevent earthquake vibrations from being transmitted to buildings. The building seismic isolation structure using the seismic isolation device ensures the safety of the building by making the seismic load acting on the building smaller than the holding strength of the building.
Patent Document 1 discloses a basic structure of a base-isolated building as shown in FIG. In this structure, a pile is provided in the lower part of each pillar 104, and the seismic isolation device is provided in the upper part of the pile.
Patent Document 2 discloses a base-isolated building including a laminated rubber bearing type base-isolation device 114a, a viscous damper 114b, and an oil damper 114c as the base-isolation mechanism 114 as shown in FIG.
As disclosed in Patent Documents 1 and 2, usually, the seismic isolation device may be provided so as to correspond to all the pillars or to be positioned at substantially equal intervals when viewed in plan. Many.

Further, Patent Document 3 discloses an intermediate floor seismic isolation structure 120 as shown in FIG. The intermediate layer seismic isolation structure 120 is supported by a plurality of lower floor pillars 121, a plurality of lower floor pillars 121 via seismic isolation devices 122, and an upper floor housing 123 that forms an upper floor, and an upper floor housing 123. A hanging portion 125 that is suspended and forms an entrance hall 124 under the second floor F2 is provided.
In the intermediate floor seismic isolation structure 120, the overhanging portion 128 is provided on the second floor F <b> 2 by a protruding large beam 127 that jumps outward from the intersection of the large beam 126.

By the way, in middle and high-rise buildings, horizontal seismic loads are repeatedly applied from multiple directions during an earthquake, so a large amount of deformation occurs in the building head, and compressive force and tensile force act alternately on the lower floor columns. Become. At that time, the concrete of the column cross section bears the compressive force, and the column main reinforcement bears the tensile force.
For example, in the seismic isolation buildings of Patent Documents 1 and 2, the seismic isolation devices are provided so as to correspond to all the columns or to be positioned at substantially equal intervals when viewed in plan. Therefore, in the outer peripheral column located at the outer corner of the outer periphery of the building, where the two walls come out in the horizontal direction, the vertical load borne by the inner column is, for example, the dominant floor It becomes about 1/4 with respect to the fixed load on the floor area supported by four pillars corresponding to the area, and the loaded load. In particular, at the time of an earthquake, in addition to the normal vertical load that is always acting, the load shaft tensile force corresponding to the load shaft compressive force generated by the horizontal seismic load and the upward force of the building in the upward direction Will work.
In order to resist this tensile force, in a middle- and high-rise base-isolated building as disclosed in Patent Documents 1 and 2, it is sufficient for a tensile force, such as a linear motion rolling bearing, at the corner of the outer periphery of the building. There may be a seismic isolation device that can resist Linear motion rolling bearings include a rail and a block that is fitted to the rail through a steel ball, and the block moves horizontally along the rail by rolling the steel ball. It corresponds to the seismic force acting on. Such seismic isolation devices that can sufficiently resist tensile force, such as linear motion rolling bearings, have a complex structure as described above compared to commonly used seismic isolation devices such as laminated rubber bearings. There are many things.
Moreover, in the seismic isolation buildings of Patent Documents 1 and 2, as described above, the seismic isolation devices are positioned so as to correspond to all the pillars or at substantially equal intervals when viewed in plan. Since many are provided, the construction period becomes longer, the construction cost becomes higher, and the restrictions on the building plan may increase.

  In the intermediate floor seismic isolation structure of Patent Document 3, in order to expand the floor area of the second floor F2 beyond the floor area of the first floor F1, an overhanging portion 128 is provided, and an outer peripheral column 129 is provided at the tip of the overhanging portion 128. And the seismic isolation apparatus 122 was arrange | positioned at the pillar head of the 1st floor F1. However, in the seismic isolation structure of Patent Document 3, it is necessary to provide the seismic isolation device 122 below the middle portion of the protruding large beam 127 in order to support the overhanging portion 128.

Japanese Patent No. 4590300 JP 2007-332643 A Japanese Patent Laying-Open No. 2015-63819

  The problem to be solved by the present invention is to provide a seismic isolation layer for building seismic isolation structures used for middle- and high-rise buildings, which is less restrictive in building planning and does not require a complex structure seismic isolation device. It is to provide the building with seismic isolation.

The present inventors do not place the seismic isolation device directly below all the columns of the seismic isolation layer as a building seismic isolation structure provided with a seismic isolation device under the building foundation or on the intermediate floor of the building. It is not provided directly under a column adjacent to the column at the corner of the projecting corner, but only at a portion of the column including at least the column at the corner of the corner. We have invented a building seismic isolation structure with excellent structural safety performance, focusing on the fact that the lifting force generated in the building during an earthquake can be suppressed due to the force acting.
The present invention employs the following means in order to solve the above problems. That is, the present invention is a building seismic isolation structure in which an upper structure is provided on an upper part of the base isolation layer, and in the base isolation layer, when the upper structure on a floor directly above the base isolation layer is viewed in plan view In addition, there is provided a building seismic isolation structure characterized in that a seismic isolation device is provided at least immediately below the column at the projected corner and an insulating space is provided immediately below the column adjacent to the projected corner.
The seismic isolation layer where the seismic isolation device is installed is located between the pile head of the pile supporting the building and the building foundation, between the upper and lower columns of the building intermediate floor, or between the columns of the intermediate floor of the building. It may be provided in the part.
According to the configuration as described above, a seismic isolation device is provided at least immediately below the column at the protruding corner, and an isolation space is provided without a seismic isolation device immediately below the column adjacent to the protruding corner. Therefore, in addition to the vertical load borne by the column in the corner, the vertical load borne by the column adjacent to the corner is applied to the seismic isolation device installed under the column in the corner. become. As a result, the seismic isolation device installed directly under the column at the corner of the corner has a seismic isolation structure in which a high compressive axial force is applied at all times, and when a horizontal seismic load acts during an earthquake and rotational deformation occurs in the building. Even if it exists, since the compressive load as a constant load is large, the lifting force which acts directly under the column can be suppressed, and the tensile force can be prevented from acting on the seismic isolation device. Therefore, it is possible to sufficiently resist the tensile force acting on the column at the corner without using a complicated structure such as a linear motion rolling bearing directly under the column at the corner, and high damping. A building-isolated structure with performance can be realized.
In addition, since the seismic isolation device is not provided directly under the pillar adjacent to the corner, it is an insulating space, so it is possible to reduce the number of seismic isolation devices, thereby reducing the construction period and construction costs. In addition, restrictions on building planning can be reduced.

In one aspect of the present invention, the lowermost beam of the upper structure is formed of a higher beam than the upper beam positioned immediately above the lowermost beam, or high strength concrete, or high strength steel. Features.
According to the above configuration, since the lowermost beam of the upper structure has high rigidity, even if the seismic isolation device is not provided directly below the column adjacent to the protruding corner, The axial force acting on the column adjacent to the protruding corner can be reliably transmitted to the seismic isolation device provided in the other column lower portion including the portion immediately below the column of the protruding corner. Further, the upper structure can be supported without separately providing a support for supporting the upper structure in the insulating space.

In another aspect of the present invention, the upper structure includes a mega truss floor having a high-rigidity mega truss beam and a hanging portion that is suspended and supported by the mega truss beam.
According to the above configuration, the upper structure includes a high-rigidity mega-truss beam. For example, the column at the outer corner supports the mega truss floor and the upper structure, and the column adjacent to the outer corner is It can be constructed so as to be suspended and supported by the mega truss beam as a pillar constituting the suspended portion. In other words, the structure below the mega truss floor of the upper structure is constructed with a suspension structure in which the load is suspended by the mega truss floor. A large space can be realized by reducing the number of peripheral pillars. A part of the reduced load on the inner peripheral column, which should be originally borne, acts on the seismic isolation device provided under the column at the protruding corner. As a result, the seismic isolation device installed directly below the column at the corner of the exit has a structure in which a high axial force is applied at all times. The tensile force which acts on the seismic isolation device provided in can be suppressed. Therefore, it is possible to sufficiently resist the tensile force acting on the column at the corner without using a complicated structure such as a linear motion rolling bearing directly under the column at the corner, and high damping. A building-isolated structure with performance can be realized.

  According to the present invention, a building seismic isolation structure having a seismic isolation layer, which is intended for building seismic isolation structures used for middle- and high-rise buildings, has less restrictions on the building plan and does not require a complex seismic isolation device. Can be provided.

It is a longitudinal cross-sectional view of the building provided with the building seismic isolation structure in embodiment of this invention. It is a plane sectional view of a base isolation layer in a building base isolation structure. It is a longitudinal cross-sectional view of the building provided with the building seismic isolation structure. FIG. It is explanatory drawing of the basic structure of the conventional seismic isolation building. It is explanatory drawing of the conventional seismic isolation building. It is explanatory drawing of the conventional intermediate floor seismic isolation structure.

The present invention relates to a building seismic isolation structure having a seismic isolation device under a building foundation or an intermediate floor of a building, and a highly rigid beam member is installed immediately above the seismic isolation device, and a projected corner installed on the beam member. It is a building seismic isolation structure in which seismic isolation devices are installed only directly below some columns, including columns at the corners, instead of installing seismic isolation devices directly below the columns adjacent to the building. Specifically, the seismic isolation device is provided only at the outer peripheral column of the outer corner, the outer peripheral column not adjacent to the outer corner column, or a part of the inner peripheral column, and the seismic isolation device is provided. It is the building seismic isolation structure (FIGS. 1-4) which has arrange | positioned the damping device under the floor part or the beam part which is not.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a building 1 having a building seismic isolation structure in the present embodiment.
The building 1 includes a lower structure 2, a seismic isolation layer 4, and an upper structure 3.
In the present embodiment, the lower structure 2 constitutes an underground floor FLG located below the ground surface GL, a first floor FL1, and a second floor FL2, and a pillar 6 erected on the foundation 5, A beam 7 is provided between the columns 6. The pillar 6 and the beam 7 of the lower structure 2 are configured by combining a reinforced concrete structure and a steel reinforced concrete structure in the basement floor FLG. In particular, a concrete-filled steel pipe is used.
A seismic isolation device 8 is provided above the lower structure 2 to form a seismic isolation layer 4.
The upper structure 3 is constructed above the seismic isolation layer 4. In the present embodiment, the upper structure 3 constitutes the third floor FL3 or more, and includes a later-described mega truss floor FLM in the middle portion. The upper structure 3 includes a column 20 and a beam 15 provided between the columns 20. The pillars 20 and the beams 15 of the upper structure 3 include the mega truss floor FLM and are below the mega truss floor FLM. In the first upper structure 3A, the steel structure is basically used. The second upper structure 3B, which is a layer above the mega truss floor FLM, is made of reinforced concrete.
Thus, the building seismic isolation structure in the present embodiment has a configuration in which the upper structure 3 is provided above the seismic isolation layer 4.

  The mega truss floor FLM is made of steel and has a highly rigid mega truss beam. That is, the mega truss floor FLM is a huge mega truss beam having a floor height in which the upper chord member 15D and the lower chord member 15C and the upper chord member 15D and the lower chord member 15C are connected by the diagonal member 16 as shown in FIG. And is arranged on a specific floor of the upper structure 3. The mega truss beam extends from the outer peripheral column 21 provided on one side surface 3a of the upper structure 3 to the outer peripheral column 21 provided on the opposite side surface 3b so as to cross the inside of the building 1. Building floor with high rigidity has been realized.

FIG. 2 is a plan sectional view (AA portion) of the seismic isolation layer 4 in which the seismic isolation device 8 in the building seismic isolation structure shown in FIG. 1 is arranged. FIG. 1 is a longitudinal sectional view of the BB portion of FIG. Moreover, FIG. 3 is a longitudinal cross-sectional view of the building 1 provided with the building seismic isolation structure which shows CC part of each of FIG. 1, FIG.
As shown in FIG. 2, the upper structure 3 of the building 1 has a shape including a plurality of protruding corner portions 10 and a plurality of entering corner portions 11 when viewed in plan. The protruding corner portion 10 is a corner portion formed by the two outer walls 9 projecting outward in the horizontal direction, and the entering corner portion 11 is a corner portion formed by the two outer walls 9 projecting inward in the horizontal direction. is there.
In FIG. 2, the seismic isolation device 8 and the column 20 of the upper structure 3 provided on the seismic isolation layer 4 are shown in corresponding positions. The column 20 of the upper structure 3 includes an outer peripheral column 21 that is the outermost column of the building 1 that is in contact with the outer wall 9 of the upper structure 3 of the building 1, and an inner column provided inside the building 1 with respect to the outer column 21. A peripheral column 26 is provided.
The outer peripheral column 21 includes an outer corner column (protruding corner column) 22 located in the outer corner portion 10 and an outer corner column adjacent to the outer corner column (protruding corner portion). Adjacent column) 23 and other columns, that is, at least the protruding corner adjacent outer peripheral column 23 between the outer corner column 22 in the middle of the outer wall 9 provided to form a continuous plane. A wall outer peripheral column 25 that is a column provided without being adjacent to the protruding corner outer peripheral column 22 is provided at a position sandwiching the outer peripheral column.
In FIG. 2, the protruding corner adjacent outer peripheral column 23 is indicated by a broken line.

In FIG. 2, the seismic isolation device 8 is indicated by a white circle. In this embodiment, all the seismic isolation devices 8 are laminated rubber bearings.
The seismic isolation device 8 is provided below a part of the column 20 of the upper structure 3 so as to support an axial force acting on the column 20. More specifically, the seismic isolation device 8 is provided under the outer corner column 22, the wall column 25, and the inner column 26. On the other hand, the seismic isolation device 8 is not provided under the outer corner column 23 adjacent to the protruding corner.
That is, in the seismic isolation layer 4, when the upper structure 3 of the third floor FL 3 that is directly above the seismic isolation layer 4 is viewed in plan, at least directly under the outer corner column 22 that is the column of the outer corner 10. The base structure 2 and the upper structure 3 are insulated immediately below the outer corner adjacent outer peripheral column 23 provided with the seismic isolation device 8 and adjacent to the outer corner 10. The insulation space S shown in FIG.

The outer corner column 22 or the wall outer column 25 that supports the mega truss floor FLM shown in FIGS. 1 and 3 is the outer corner column 22 or the wall outer column that is the lowest end of the upper structure 3. 25, a seismic isolation device 8 is provided, and axial force is transmitted to the lower structure 2 via the seismic isolation device 8, and thus, the outer corner column 22, the wall outer column 25, And it is supported by the inner peripheral column 26. The mega truss floor FLM is formed with high rigidity as described above, and supports the axial force of the second upper structure 3B located above the mega truss floor FLM, and this axial force is used as the first upper structure. In 3A, it is comprised so that it may transmit to the protrusion outer peripheral column 22, the wall outer peripheral column 25, and the inner peripheral column 26 which support the mega truss floor FLM. In this way, the load of the upper structure 3 is supported by the outer corner column 22, the wall column 25, and the inner column 26.
On the other hand, the seismic isolation device 8 is not provided directly below, and the outer corner column adjacent outer peripheral column 23 in which the insulating space S is formed with the lower structure 2 is suspended on the mega truss floor FLM. It is supported. Floor slabs (not shown) provided on each floor of the first upper structure 3A are supported by the outer peripheral column 22, the wall outer peripheral column 25, and the inner peripheral column 26, and the outer corner adjacent peripheral column 23. Is supported by hanging.
As described above, the upper structure 3 is constructed as a suspended structure including a suspended portion that is suspended and supported by the mega truss floor FLM. Thereby, in the hierarchy located below the mega truss floor FLM of the first upper structure 3A, many inner peripheral columns 26 are not required, and a large space is realized by extending the column 20 span.

FIG. 4 is an enlarged view of a portion indicated by an arrow D in FIG. 3 and illustrates the structure of the seismic isolation layer 4. The seismic isolation layer 4 is provided between the lower structure 2 and the upper structure 3, more specifically, the uppermost end beam 7 </ b> A provided at the uppermost position of the lower structure 2 and the lowermost position of the upper structure 3. Are provided between the lowermost beams 15A.
The lowermost beam 15A of the upper structure 3 is formed of a higher beam than the upper beam 15B located immediately above the lowermost beam 15A shown in FIG. 1, FIG. 3, or the like, high strength concrete, or high strength steel. ing.

Of the joints between the uppermost end beam 7 </ b> A of the lower structure 2 and the columns 6, the joints located below the wall outer peripheral column 25 and the inner peripheral column 26 of the upper structure 3 surround the joints. Thus, the reinforced concrete lower footing 12 is formed in a substantially rectangular parallelepiped shape. As shown in FIGS. 1 and 3, the lower cornering 12 is also formed in the joint portion located below the outer corner column 22 of the protruding corner.
At the joint between the lowermost beam 15A of the upper structure 3 and the outer peripheral column 25 and the inner peripheral column 26, a reinforced concrete upper footing 13 is formed in a substantially rectangular parallelepiped shape so as to surround the joint. ing. As shown in FIGS. 1 and 3, the upper footing 13 is also formed at the joint with the lowermost end beam 15 </ b> A in the protruding corner outer peripheral column 22.
The seismic isolation device 8 has a structure in which a laminated rubber portion 8a in which a plurality of steel plates are laminated with rubber sandwiched therebetween is sandwiched between a lower flange 8b and an upper flange 8c, and the lower flange 8b is an upper surface of the lower footing 12. Further, the upper flange 8 c is provided on the lower surface of the upper footing 13 so as to face each other, and is fixed to the lower footing 12 and the upper footing 13.

The uppermost end beam 7A of the lower structure 2 and the lowermost end beam 15A of the upper structure 3 are joined via a damper 17 in addition to the seismic isolation device 8. The damper 17 is an isolation between the lower structure 2 and the younger brother 1 upper structure 3A having the mega truss floor FLM in the plan sectional view of the seismic isolation layer shown in FIG. 2 and the longitudinal sectional views shown in FIGS. In the seismic layer 4, the seismic layer 4 is disposed under the floor portion or the beam portion where the inner peripheral column 26 is not provided.
In addition, in the first upper structure 3A, the vertical load transmitted to the lower structure 2 via the inner peripheral column 26 is small by being supported by being suspended from the mega truss beam supported by the outer peripheral column 21, As shown in FIGS. 2 and 4, the inner peripheral column in the first upper structure 3 </ b> A is located at the position where the inner peripheral column 26 is installed in the lower structure 2 or the second upper structure 3 </ b> B. 26 is not provided, and the column 20 member is long spanned, and a column beam frame is formed by the wall outer peripheral column 25 and the protruding corner outer peripheral column 22. Specifically, in FIG. 4, an inner peripheral column 26B indicated by a two-dot chain line indicates a position of the inner peripheral column 26 in the second upper structure 3B located above the first upper structure 3A. In the first upper structure 3A, the inner peripheral column 26 is not actually provided at this position.
The uppermost end beam 7A of the lower structure 2 includes a damper support portion 7a having a connection surface 7d formed on the upper surface 7b so as to be perpendicular to the upper surface 7b. Further, the lowermost end beam 15A of the upper structure 3 includes a damper support portion 15a having a connection surface 15d formed on the lower surface 15c so as to be perpendicular to the lower surface 15c.
The connection surface 7d of the damper support portion 7a of the uppermost beam 7A and the connection surface 15d of the damper support portion 15a of the lowermost beam 15A are provided so as to face each other, and the damper 17 has one end 17a supported by the damper. The other end 17b is joined to the connection surface 7d of the damper support portion 15a, and the other end 17b is joined to the connection surface 7d of the portion 7a.

  Next, the operation and effect of the above-mentioned building seismic isolation structure will be described.

According to the above configuration, the seismic isolation device 8 is provided at least directly below the outer corner column 22 of the corner and the seismic isolation device 8 is not provided immediately below the outer column 23 adjacent to the corner. Therefore, the seismic isolation device 8 provided under the outer corner outer peripheral column 22 has an adjacent outer corner adjacent outer peripheral column 23 in addition to the vertical load borne by the outer corner outer peripheral column 22. Part of the vertical load borne by
Further, the upper structure 3 includes a high-rigidity mega truss beam FLM, the outer corner column 22 supports the mega truss floor FLM and the upper structure 3, and the outer corner column 23 adjacent to the outer corner 23 has a hanging portion. It is suspended and supported by a mega truss beam as a pillar. That is, below the mega truss floor FLM of the upper structure 3 is constructed by a suspension structure in which a load is suspended by a mega truss beam, so that the inner peripheral column 26 is compared with a case of constructing by a normal structure other than the suspension structure. A large space can be realized by reducing the number of A part of the reduced vertical load that should be originally borne by the inner peripheral column 26 also acts on the seismic isolation device 8 provided under the outer corner column 22.
The above effects are synergistic, and the seismic isolation device 8 provided immediately below the outer corner column 22 has a seismic isolation structure to which a high compressive axial force is applied at all times, and a horizontal seismic load acts on the building 1 during an earthquake. Even when rotational deformation occurs, the compressive load as a constant load is large, so that the lifting force acting directly below the column 20 can be suppressed and the tensile force acting on the seismic isolation device 8 can be suppressed. Therefore, it is possible to sufficiently resist the tensile force acting on the outer corner column 22 without using a seismic isolation device having a complicated structure, such as a linear rolling support, just below the outer corner column 22. A building seismic isolation structure with high damping performance can be realized.

  In addition, since the seismic isolation device 8 is not provided immediately below the outer peripheral column 23 adjacent to the protruding corner, and the insulating space S is provided, the number of the seismic isolation devices 8 can be reduced. Costs can be constrained and restrictions on building plans can be reduced.

The lowermost beam 15A of the upper structure 3 is made of a higher beam than the upper beam 15B located immediately above the lowermost beam 15A, or is made of high-strength concrete or high-strength steel, and has high rigidity. Therefore, even if the seismic isolation device 8 is not provided directly under the outer corner adjacent outer peripheral column 23 and is the insulating space S, the axial force acting on the outer corner adjacent outer peripheral column 23 is reliably ensured. It can transmit to the seismic isolation apparatus 8 provided in other parts, such as the pillar 22. Further, the upper structure 3 can be supported without providing a separate support for supporting the upper structure 3 in the insulating space S.
In addition, the damper 17 provided in the seismic isolation layer 4 is disposed under the floor portion where the outer peripheral column 23 adjacent to the outer peripheral column 22 of the protruding corner portion 10 or the inner peripheral column 26 is not provided, or under the beam portion. A damping effect can be exerted on the amount of horizontal deformation acting on the seismic isolation device 8 immediately below the column 22 at the corner 10. Moreover, even if it is damper apparatus, such as a marketed product, the damper 17 can be easily arrange | positioned without receiving restrictions on arrangement | positioning by providing under the floor part and beam part which do not arrange | position the seismic isolation apparatus 8. FIG.

The building seismic isolation structure of the present invention is not limited to the above-described embodiment described with reference to the drawings, and various other modifications are conceivable within the technical scope thereof. For example, in the above embodiment, the building 1 has the intermediate floor seismic isolation structure in which the seismic isolation layer 4 is provided on the second floor FL2. However, the present invention is not limited to this, and the building 1 is exempted under or on the foundation of the building. It may be a basic seismic isolation structure with a seismic layer. Moreover, even if it is a middle-floor seismic isolation structure, the seismic isolation layer 4 is provided between the upper and lower floor pillars of the building middle floor as in the above embodiment. May be provided.
Other than this, as long as the gist of the present invention is not deviated, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 1 Building 15C Lower chord material 2 Lower structure 15D Upper chord material 3 Upper structure 17 Damper 3A 1st upper structure 20 Column 3B (upper structure) 2nd upper structure 21 Outer pillar 4 Seismic isolation layer 22 Outer corner outer circumference Pillar (pillar in the corner)
6 Column (of lower structure) 23 Outer corner adjacent outer peripheral column (column adjacent to the projected corner)
7 Beam (outer structure) 25 Outer wall column 7A Top end beam 26 Inner column 8 Seismic isolation device FL1 First floor 9 Outer wall FL2 Second floor 10 Out corner FL3 Third floor (directly above floor)
11 Corner corner FLM Mega truss floor 15 (upper structure) beam FLG Basement floor 15A Bottom end beam S Insulating space 15B Upper beam

Claims (3)

It is a building seismic isolation structure with an upper structure above the seismic isolation layer,
In the seismic isolation layer, when the upper structure on the floor immediately above the seismic isolation layer is viewed in plan, a seismic isolation device is provided at least directly below the column at the exit corner and is adjacent to the exit corner. A base-isolated structure characterized by an insulating space directly under the pillar.   The lowermost beam of the upper structure is formed of a higher beam than the upper beam located immediately above the lowermost beam, high strength concrete, or high strength steel. Building seismic isolation structure. 3. The building seismic isolation structure according to claim 1, wherein the upper structure includes a mega truss floor having a high-rigidity mega truss beam and a suspension part supported by being suspended from the mega truss beam. .

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