JP7052950B2 - Seismic isolated building - Google Patents

Description

The present invention relates to a seismic isolated building.

Patent Document 1 discloses a structure in which a wall-shaped plate projects downward from the tip of a roof supported by pillars via a seismic isolation device, and the plate is rotatably attached to the roof. There is. In addition, the plate and the pillar are rotatably connected to the brace. This allows the plate to follow even if there is a relative displacement between the roof and the pillars.

Japanese Unexamined Patent Publication No. 2015-15886

However, it is not considered to seismically isolate the roof that greatly overhangs from the structure such as the roof that forms a large space such as an atrium, and it is improved from the viewpoint of reducing the seismic force acting on such a roof. There is room.

In consideration of the above facts, an object of the present invention is to obtain a seismic isolated building capable of reducing the seismic force acting on the roof.

The seismic isolation building according to the present invention according to claim 1 includes a substructure provided on a support structure, an upper structure supported by the substructure via a seismic isolation device, and the superstructure. It has a roof that projects outward from the body, an atrium that is arranged adjacent to the substructure and is formed below the roof, and columns that support the roof so as to be horizontally movable.

According to the seismic isolated building according to the present invention according to claim 1, the lower structure is provided on the support structure, and the upper structure is supported by the lower structure via the seismic isolation device. In addition, the roof overhangs from the superstructure to the outside. In this way, since the roof projects from the upper structure supported by the seismic isolation device, it is possible to suppress the transmission of the seismic force input to the lower structure to the roof.

In addition, the roof is supported by columns so that it can move horizontally. As a result, even when the roof moves horizontally together with the superstructure during an earthquake, damage to the columns can be suppressed and the roof can be well supported.

The seismic isolated building according to the present invention according to claim 2 is the seismic isolated building according to claim 1, and an outer wall frame is suspended from the peripheral portion of the roof.

According to the seismic isolated building according to the present invention according to claim 2, since the outer wall frame is suspended from the peripheral edge of the roof, the outer wall frame can be seismically isolated and supported together with the roof. As a result, it is possible to suppress damage to the outer wall frame and the outer wall finish supported by the outer wall frame during an earthquake.
The seismic isolated building according to the present invention according to claim 3 is the seismic isolated building according to claim 2, and the outer wall lower frame is provided below the outer wall frame and above the support structure. The gap between the outer wall frame and the lower outer wall frame is closed.

The seismic isolated building according to the present invention according to claim 4 is the seismic isolated building according to any one of claims 1 to 3, and the upper end portion of the support column is rotatably connected to the roof. The lower end of the column is rotatably connected to the support structure.

According to the seismic isolated building according to the present invention according to claim 4 , since both the upper end and the lower end of the columns are rotatably connected, the horizontal relative between the support structure and the roof at the time of an earthquake. The strut is tilted following the movement, and damage to the strut can be suppressed.

As described above, according to the seismic isolated building according to the present invention, it is possible to reduce the seismic force acting on the roof of a large space.

It is a schematic elevation view of the seismic isolated building which concerns on embodiment. It is a schematic elevation view corresponding to FIG. 1 at the time of an earthquake. It is a perspective view which shows the roof and the outer wall frame. It is a perspective view which shows the outer wall frame. It is an enlarged view which shows the lower end part of a column enlarged. (A) is an enlarged view of the joint portion between the roof frame and the superstructure, and (B) is a cross-sectional view showing a state of being cut along line 6B-6B of FIG. 6 (A). It is a schematic elevation view which shows the modification of the seismic isolated building which concerns on embodiment.

Hereinafter, the seismic isolated building according to the embodiment of the present invention will be described with reference to the drawings. In addition, the arrow Z appropriately shown in each figure indicates a vertical direction (vertical direction), and the arrows X and Y appropriately indicated in each figure indicate two horizontal directions orthogonal to each other.

As shown in FIG. 1, the seismic isolated building 10 according to the present embodiment includes a lower structure 12, an upper structure 14, and an atrium 16. Further, the upper structure 14 is supported by the lower structure 12 via the seismic isolation device 18, whereby the seismic isolation building 10 constitutes an intermediate-story seismic isolation building.

The lower structure 12 and the upper structure 14 are made of reinforced concrete as an example, and are built on a foundation 21 as a support structure provided in the ground 20. Further, a plurality of seismic isolation devices 18 are provided on the upper surface of the lower structure 12 (two seismic isolation devices 18 are shown in FIG. 1). In this embodiment, as an example, the seismic isolation device 18 is composed of a lead-containing laminated rubber bearing and an elastic sliding bearing. The lower structure 12 and the upper structure 14 are not limited to the reinforced concrete structure, but may be other structures such as a steel frame structure, a steel frame reinforced concrete structure, and a CFT (Concrete-Filled Steel Tube) structure. good.

Since the seismic isolation device 18 is provided between the lower structure 12 and the upper structure 14, the seismic isolation device 18 undergoes shear deformation during an earthquake, as shown in FIG. 2, and the upper structure 14 and the seismic isolation device 18 are provided. The lower structure 12 and the lower structure 12 are relatively displaced in the horizontal direction. As a result, the seismic force is suppressed from acting on the superstructure 14.

As shown in FIG. 1, the atrium 16 is formed below the roof 17 so as to be covered with the roof 17 overhanging from the superstructure 14, and is arranged next to the substructure 12.

The roof 17 projects from the upper structure 14 in the Y direction (to the right in FIG. 1), and one end of the roof 17 in the Y direction is joined to the upper structure 14. Further, the roof 17 includes a three-dimensional roof truss 22 composed of an upper chord member 22A, a lower chord member 22B, and a diagonal member 22C connecting the upper chord member 22A and the lower chord member 22B.

As shown in FIG. 3, as an example in the present embodiment, ten three-dimensional roof trusses 22 are arranged at intervals in the X direction, and these three-dimensional roof trusses 22 are connected to each other by a beam member 24. The roof 17 is configured by this. In FIG. 3, for convenience of explanation, the three-dimensional roof truss 22 is shown in a simplified manner, and the diagonal member 22C and the like are not shown.

As shown in FIG. 1, a support column connecting portion 26 is formed at an end portion of the roof 17 in the overhanging direction (right direction in FIG. 1), and a support column 28 is formed at the tip end (lower end) of the support column connecting portion 26. It is attached. As shown in FIG. 3, as an example, ten columns 28 are provided along the end portion of the roof 17 in the overhanging direction. Further, one support column 28 is also provided at one end of the roof 17 in the X direction. Each support column 28 includes a main body portion 28A and a ball joint 28B provided at an upper end portion and a lower end portion of the main body portion 28A, respectively.

The main body portion 28A is formed of a substantially cylindrical steel pipe, and extends linearly in the vertical direction (Z direction) in a normal state. The upper end of the main body 28A is connected to the column connecting portion 26 via the ball joint 28B. Further, the lower end portion of the main body portion 28A is connected to the foundation 21 via a ball joint 28B. Here, since the ball joint 28B on the upper end side and the ball joint 28B on the lower end side of the main body 28A have the same structure and are general ball joints, only the ball joint 28B on the lower end side is shown and simply shown. explain.

As shown in FIG. 5, the ball joint 28B includes a connecting portion 30 and a spherical portion 32. The connecting portion 30 is formed in a substantially conical shape, and the upper end portion of the connecting portion 30 is fixed to the main body portion 28A of the support column 28.

The spherical portion 32 is integrally formed with the connecting portion 30 at the lower end portion of the connecting portion 30, and the spherical portion 32 is rotatably connected to the receiving member 34 fixed to the foundation 21 side. The receiving member 34 is fixed to the foundation 21 by bolts or the like, and a spherical recess 34A is formed on the upper surface of the receiving member 34. The spherical portion 32 is fitted in the recess 34A. The receiving member 34 is configured so that it can be divided into upper and lower parts. After attaching the spherical portion 32 to the lower member in the divided state, the lower member and the upper member are joined to form a spherical shape. It is a structure that prevents the portion 32 from coming off.

In this way, the lower end of the column 28 is rotatably connected to the foundation 21 by the ball joint 28B, and the upper end of the column 28 is rotatably connected to the roof 17 by the ball joint 28B. Therefore, the roof 17 is supported by the columns 28 so as to be horizontally movable.

As shown in FIG. 3, an outer wall frame 36 is suspended from the peripheral edge of the roof 17. As shown in FIG. 4, the outer wall frame 36 includes a vertical truss 40 extending in the vertical direction and a horizontal truss 38 extending in the horizontal direction. In FIG. 3, for convenience of explanation, the outer wall frame 36 is drawn in a simplified manner, and a part of members such as diagonal lumber is omitted.

The horizontal truss 38 is provided at two locations, an intermediate portion in the vertical direction of the outer wall frame 36 and a lower end portion of the outer wall frame 36. Further, each horizontal truss 38 is continuously formed along the outer peripheral portion of the roof 17 from one end to the other end in the horizontal direction of the outer wall frame 36. The horizontal truss 38 connects the five vertical trusses 40 in the horizontal direction.

The vertical truss 40 extends downward from the roof 17 and is provided in the area below the end of the roof 17 in the overhanging direction in the outer wall frame 36. Further, in the present embodiment, five vertical trusses 40 are provided, and the five vertical trusses 40 are connected to two horizontal trusses 38, respectively. Then, these five vertical trusses 40 are connected in the X direction at the upper end to form the vertical truss frame 41.

Further, an end truss 42 connected to the horizontal truss 38 is provided at the end of the outer wall frame 36 on the lower structure 12 side. The end truss 42 is provided at one end and the other end of the outer wall frame 36, respectively, and is a three-dimensional truss frame.

As shown in FIG. 1, an outer wall lower frame 43 is provided below the outer wall frame 36. The outer wall lower frame 43 has a shape corresponding to the outer wall frame 36, and is constructed on the foundation 21. Further, a waterproof rubber 46 is provided on the upper surface of the outer wall lower frame 43, and the gap between the finishing panel (not shown) provided on the outer surface of the outer wall frame 36 and the outer wall lower frame 43 is formed by the waterproof rubber 46. It is blocked and the water is stopped.

In this embodiment, as an example, the height of the outer wall lower frame 43 is set to be the height of the windbreak room of the outer wall lower frame 43, which is higher than that of a pedestrian. In other words, the lower end of the outer wall frame 36 is located above the pedestrian and has a height of about 4.5 m.

The outer wall frame 36 and the lower structure 12 are connected by an expansion joint 44. Therefore, as shown in FIG. 2, when the outer wall frame 36 and the outer wall lower frame 43 move relative to each other during an earthquake, the expansion joint 44 causes the horizontal relative displacement of the outer wall frame 36 and the lower structure 12 to occur. It is configured to be absorbable. Further, by deforming the waterproof rubber 46, the waterproof state between the upper surface of the outer wall lower frame 43 and the lower surface of the outer wall frame 36 is maintained.

Next, the connection portion between the roof 17 and the superstructure 14 will be described with reference to FIGS. 6 (A) and 6 (B). As shown in FIGS. 6 (A) and 6 (B), a bundle member 50 is provided on the girder 48 constituting the superstructure 14. The bundle member 50 has a closed cross section (box cross section), and is formed so that the width (length in the X direction) becomes shorter toward the upper side. Then, the upper chord member 22A of the roof 17 is joined onto the bundle member 50. Further, a pair of stiffeners 51 connecting the upper and lower flanges are provided at positions corresponding to the bundle member 50 in the girder 48.

On the other hand, a bundle member 52 is provided under the girder 48. The bundle members 52 are arranged on both sides of the upper bundle member 50, and each has a closed cross section (box cross section). Then, the lower chord member 22B of the roof 17 is joined under the bundle member 52. Further, a pair of stiffeners 53 connecting the upper and lower flanges are provided at positions corresponding to the bundle member 52 in the girder 48.

Further, one end portion (lower end portion) of the brace 54 is joined to the bundle member 52. The other end (upper end) of the brace 54 is joined to the floor slab 56 of the upper structure 14, so that the stress of the lower chord member 22B can be smoothly transmitted to the upper structure 14 by the brace 54. It is configured.

Further, a reinforcing member 55 that vertically connects the upper chord member 22A and the lower chord member 22B is joined to the base end portion of the roof 17.

(Action)
Next, the operation of the seismic isolated building according to this embodiment will be described.

In the seismic isolated building 10 according to the present embodiment, as shown in FIG. 1, the upper structure 14 is seismically supported by the lower structure 12 via the seismic isolation device 18, and the roof from the upper structure 14 17 is overhanging. In this way, since the roof 17 projects from the superstructure 14 supported by the seismic isolation device 18, the roof 17 is seismically isolated and supported integrally with the superstructure 14 in the event of an earthquake. As a result, it is possible to suppress the seismic force input to the substructure 12 from being transmitted to the roof 17.

Further, the roof 17 is supported by a plurality of columns 28 so as to be horizontally movable. Both the upper end portion and the lower end portion of the support column 28 are rotatably connected by a ball joint 28B. As a result, as shown in FIG. 2, even when the roof 17 moves horizontally together with the superstructure 14 at the time of an earthquake, the pillar 28 is tilted following the horizontal movement of the roof 17, so that the pillar 28 is tilted. The damage of 28 can be suppressed, and the roof 17 can be well supported. This makes it possible to reduce the seismic force acting on a large-scale roof that forms a large space such as an atrium.

Further, since the outer wall frame 36 is suspended from the peripheral edge of the roof 17, the outer wall frame 36 can be seismically supported together with the roof 17. As a result, damage to the outer wall frame 36 and the outer wall finish can be suppressed during an earthquake. At this time, in FIG. 2, the lower end of the outer wall frame 36 is located above the pedestrian. This prevents the outer wall frame 36 from coming into contact with pedestrians and the like around the atrium 16 even when the outer wall frame 36 and the roof 17 move relative to each other during an earthquake.

Furthermore, in the present embodiment, as shown in FIGS. 3 and 4, the outer wall frame 36 includes a vertical truss 40 extending in the vertical direction and a horizontal truss 38 connecting the vertical trusses. As a result, when a horizontal force acts on the outer wall frame 36 due to a strong wind or the like, the horizontal force is transmitted from the horizontal truss 38 to the vertical truss 40, and further, the horizontal force is transmitted from the vertical truss 40 to the superstructure 14 via the roof 17. Can be communicated.

In particular, in the present embodiment, since the horizontal truss 38 is continuously formed along the outer peripheral portion of the roof 17, the horizontal force acting on the outer wall frame 36 is surely applied from the roof 17 to the upper structure via the vertical truss 40. It can be transmitted to the body 14.

Further, an end truss 42 is provided at a connection portion of the outer wall frame 36 with the seismic isolated building 10, and the end truss 42 is provided at one end and the other end of the outer wall frame 36, respectively. As a result, the horizontal force input to the horizontal truss 38 can be transmitted from the end truss 42 to the structure. As a result, the horizontal force acting on the outer wall frame 36 due to strong wind or the like can be dispersed into a route for transmitting the horizontal force from the roof 17 to the upper structure 14 and a route for transmitting the horizontal force from the end truss 42 to the upper structure 14.

In particular, as shown in FIG. 4, the horizontal force acting in the overhanging direction (Y direction) of the roof 17 is transmitted from the horizontal truss 38 to the end truss 42, and is transmitted from the end truss 42 to the superstructure 14. Will be done. On the other hand, of the horizontal forces acting in the direction intersecting the overhanging direction (X direction) of the roof 17, the force acting on the vertical truss 40 side is transmitted from the horizontal truss 38 to the vertical truss 40, and the vertical truss 40 transmits the force to the roof. It is transmitted to the superstructure 14 via 17. Further, of the horizontal forces acting in the direction intersecting the overhanging direction (X direction) of the roof 17, the force acting on the end truss 42 side is transmitted from the end truss 42 to the superstructure 14. In this way, it is possible to reduce the outer wall frame 36 from shaking due to a strong wind or the like.

(Modification example)
Next, a modified example of the seismic isolated building will be described with reference to FIG. 7.

As shown in FIG. 7, in this modification, the lower part of the structure 60 that supports the upper structure 14 for seismic isolation is buried in the ground 20 to form the underground structure 61, and is above the structure 60. The portion is the lower structure 12. Further, the underground structure 61 is a support structure. The upper structure 14 is supported by the lower structure 12 via the seismic isolation device 18.

A roof 17 projects from the upper structure 14 in the Y direction, and a support column 28 is attached to an end portion of the roof 17 in the projecting direction (right direction in FIG. 1). The support column 28 includes a main body portion 28A and ball joints 28B provided at the upper end portion and the lower end portion of the main body portion 28A, respectively.

The main body portion 28A is formed in a substantially cylindrical shape, and extends linearly in the vertical direction (Z direction) in a normal state. The upper end of the main body 28A is connected to the column connecting portion 26 via the ball joint 28B. Further, the lower end portion of the main body portion 28A is connected to the ceiling portion upper surface 62 of the underground structure 61 via a ball joint 28B.

In the modified example, it is possible to reduce the seismic force acting on the large-scale roof forming a large space as in the embodiment.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these embodiments and modifications, and can be carried out in various embodiments without departing from the gist of the present invention. Of course. For example, in the present embodiment, as shown in FIG. 3, 11 columns 28 for supporting the roof 17 of the atrium 16 are provided, but the present invention is not limited to this, and may be appropriately changed depending on the size of the roof 17 and the like. good. Further, the arrangement of the columns 28 may be changed as appropriate.

Further, in the present embodiment, the ball joints 28B are provided at the upper end and the lower end of the support column 28, but the present invention is not limited to this, and if the roof 17 can be supported so as to be movable in the horizontal direction, another structure may be adopted. good. For example, a sliding mechanism or the like may be provided at the upper end and the lower end of the support column 28 to support the roof 17, or the ball joint 28B and the sliding mechanism may be combined.

Furthermore, in the present embodiment, as shown in FIG. 4, the outer wall frame 36 is configured by including the vertical truss 40, the horizontal truss 38, and the end truss 42, but the outer wall frame 36 is not limited to this, and the vertical truss 40 and the like. An outer wall frame without a horizontal truss 38 may be used.

Further, in the present embodiment, the support structure is the foundation 21, and in the modified example, the support structure is the underground structure 60, but the present invention is not limited to this. That is, as long as it is a structure that can support the lower structure 12, another structure may be adopted as the support structure.

Further, in FIG. 1, the foundation 21 that supports the lower structure 12 and the foundation 21 to which the lower ends of the columns 28 are connected may be separated from each other. For example, the lower structure 12 may be supported by the foundation 21, and the lower end of the support column 28 may be connected to the ceiling portion of the underground structure.

Furthermore, in FIG. 7, the lower end of the column 28 may be connected to an underground structure different from the underground structure 61 that supports the lower structure 12.

10 Seismic isolation building 12 Substructure 14 Superstructure 17 Roof 18 Seismic isolation device 21 Foundation (support structure)
28 Pillar 36 Outer wall frame 60 Underground structure (support structure)

Claims (4)

The substructure provided on the support structure and
An upper structure supported by the lower structure via a seismic isolation device, and
The roof overhanging from the superstructure and
An atrium arranged adjacent to the substructure and formed below the roof,
A support column that supports the roof so that it can be moved horizontally,
Seismic isolation building with. The seismic isolated building according to claim 1, wherein an outer wall frame is suspended from the peripheral edge of the roof. An outer wall lower frame is provided below the outer wall frame and above the support structure.
The seismic isolated building according to claim 2, wherein the gap between the outer wall frame and the lower outer wall frame is closed. The one according to any one of claims 1 to 3, wherein the upper end portion of the support column is rotatably connected to the roof, and the lower end portion of the support column is rotatably connected to the support structure. Seismic isolated building.

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