JP6770329B2 - building - Google Patents

Description

The present invention relates to a building.

Buildings with a large tower ratio, such as buildings built in narrow areas and high-rise buildings, have a large overturning moment during an earthquake, so it is conceivable that a large pulling force will act on the pillar members provided in this building.

For this reason, it is necessary to use pull-out allowable rubber for the laminated rubber used in the seismic isolation device that supports the column members, or to make the first-floor beam a beam having a large cross section. Further, in the seismic isolated building disclosed in Patent Document 1, a counterweight is provided on the outer peripheral portion of the superstructure near the seismic isolated layer to reduce the pulling force acting on the column member.

JP-A-2002-54323

In consideration of such facts, it is an object of the present invention to reduce the pulling force acting on the column members during an earthquake.

The invention of the first aspect constitutes a lower layer portion of the upper structure, and has a cross-sectional area larger than the cross-sectional area of the upper pillar provided on the floor above the lower layer portion and is supported by the lower structure. A ramen frame provided with members, a beam member erected between the column members having a cross-sectional area smaller than the cross-sectional area of the upper beam provided on the floor above the lower layer portion, and a beam member provided on the beam member. The floor slab, the beam member whose ends are pin-joined to the pillar members and erected between the pillar members, and the floor slab provided on the beam members, the ends of which are rigidly joined to the pillar members. A floor composed of a beam member erected between column members and having a cross-sectional area at an end smaller than the cross-sectional area at the center, a floor slab provided on the beam member, or a floor slab erected between the column members. It is a building with a part and.

In the invention of the first aspect, the lower layer portion is configured by a heavy ramen frame including a column member having a cross-sectional area larger than the cross-sectional area of the upper column provided on the floor above the lower layer portion of the superstructure. As a result, the center of gravity of the superstructure supported on the substructure can be lowered, and the overturning moment acting on the superstructure during an earthquake can be reduced. As a result, the pulling force acting on the column member during an earthquake can be reduced.

Further, the column member having a large cross-sectional area can be made to resist the bending moment acting on the column member at the time of an earthquake.

Further, the beam member having a cross-sectional area smaller than the cross-sectional area of the upper beam provided on the floor above the lower layer and erected between the column members, and the floor slab and the column member provided on the beam member. Beam members whose ends are pin-joined and erected between column members, floor slabs provided on these beam members, and ends are rigidly joined to column members and erected between column members to reduce the cross-sectional area of the ends. By forming the floor part with a beam member smaller than the cross-sectional area of the central part and the floor slab provided on the beam member or the floor slab erected between the column members, it occurs at the end of the floor part at the time of an earthquake. The bending moment can be reduced. Therefore, the beam member that supports the floor slab can be a beam having a small beam cross section and a small beam formation, or the beam member that supports the floor slab can be eliminated.

The invention of the second aspect has a seismic isolation device installed in the substructure to support the pillar member in the building of the first aspect.

In the invention of the second aspect, in a building in which a pillar member is supported by a seismic isolation device (seismic isolation building), the overturning moment acting on the superstructure at the time of an earthquake can be reduced, and the pulling force acting on the seismic isolation device can be reduced. Can be made smaller.

In the invention of the third aspect, in the building of the first or second aspect, the substructure is a foundation part constructed on the existing foundation part.

In the invention of the third aspect, by constructing the foundation portion based on the existing foundation portion, it is possible to reduce the construction work for constructing the foundation portion, shorten the construction period, and reduce the construction cost.

Since the present invention has the above configuration, the pulling force acting on the column member during an earthquake can be reduced.

It is an elevation view which shows the building which concerns on embodiment of this invention. It is a front view which shows the building which concerns on embodiment of this invention. It is a front view which shows the conventional building. It is a front view which shows the variation of the building which concerns on embodiment of this invention. It is a front view which shows the variation of the building which concerns on embodiment of this invention.

An embodiment of the present invention will be described with reference to the drawings. First, the building according to the embodiment of the present invention will be described.

As shown in the elevation view of FIG. 1, the building 10 has a reinforced concrete foundation portion 14 as a substructure constructed in the ground 12 and a plurality of seismic isolation devices 16 installed on the foundation portion 14. It is a seismic isolated building composed of a supported reinforced concrete superstructure 18.

The foundation portion 14 is constructed on the existing foundation portion 22 of the demolition building, which is supported by the support pile 20 buried in the ground 12. That is, a new building 10 is built using the existing foundation portion 22 of the demolished building.

The superstructure 18 includes a ramen frame 24 and a floor portion 26. The rigid frame frame 24 includes a beam 28 as a reinforced concrete beam member and a column 30 as a reinforced concrete column member, and is a lower layer portion 32 of the superstructure 18 (in this example, the first floor portion of the superstructure 18). ) Is configured. The pillar 30 is supported by a seismic isolation device 16 installed on the foundation portion 14.

Further, the pillar 30 of the ramen frame 24 has a cross-sectional area larger than the cross-sectional area of the upper pillar (for example, the pillar 34 provided on the third floor of the superstructure 18) provided on the floor above the lower layer portion 32. However, the beam 28 of the ramen frame 24 has a cross-sectional area larger than the cross-sectional area of the upper beam (for example, the beam 36 provided on the third floor of the superstructure 18) provided on the floor above the lower layer portion 32. are doing. As a result, the rigid frame frame 24 is heavier than the column-beam frame for the first floor provided on the floor above the lower layer 32 (for example, the column-beam frame 38 provided on the third floor of the superstructure 18). It has become.

As shown in the front view of FIG. 2, the floor portion 26 is formed on a beam 40 as a beam member made of H-shaped steel and a beam 40 which is erected between the columns 30 by pin-joining the ends to the columns 30. It is configured to have a reinforced concrete floor slab 42 provided.

Next, the operation and effect of the building according to the embodiment of the present invention will be described.

In the building 10 of the present embodiment, as shown in FIG. 1, the weight is provided with the pillar 30 having a cross-sectional area larger than the cross-sectional area of the pillar 34 provided on the floor above the lower layer portion 32 of the superstructure 18. By constructing the lower layer portion 32 by the heavy ramen frame 24 of the above, the center of gravity of the upper structure 18 supported on the foundation portion 14 can be lowered, and the overturning moment acting on the upper structure 18 at the time of an earthquake can be reduced. ..

As a result, the pulling force acting on the pillar 30 and the seismic isolation device 16 at the time of an earthquake can be reduced. Further, the column 30 having a large cross-sectional area can be made to resist the bending moment acting on the column 30 at the time of an earthquake.

Further, in the building 10 of the present embodiment, as shown in FIG. 2, the floor portion 26 is provided on the beam 40 and the beam 40 erected between the columns 30 by pin-joining the ends to the columns 30. By having the floor slab 42 made of reinforced concrete, the bending moment generated at the end of the floor 26 at the time of an earthquake can be reduced.

As a result, the beam 40 supporting the floor slab 42 can be made into a beam having a small beam cross section and a small beam formation, and the seismic isolation pit level (in the example of FIG. 2, the height of the upper surface of the foundation portion 14) is increased. be able to. For example, when building a building 10 using the existing foundation portion 22 as in the present embodiment, the dismantling range of the existing foundation portion 22 may be reduced, or the stance of the pillar 30 (seismic isolation device 16 supporting the pillar 30) may be reduced. The installation interval) can be increased to make the ramen frame 24 into a frame type that is advantageous against the overturning of the superstructure 18.

As shown in the front view of FIG. 3, in the conventional building 44, since the foundation beam 46 having a large beam cross section and a large beam formation was used, the seismic isolation pit level (in the example of FIG. 3, the upper surface of the foundation portion 48). Since the height) becomes low and a retaining wall having a predetermined thickness must be provided around the seismic isolation pit, the installation interval of the seismic isolation device 16 becomes narrow.

On the other hand, in the building 10 of the present embodiment, as shown in FIG. 2, by making the beam 40 a beam having a small beam cross section and a small beam formation, the retaining wall provided around the seismic isolation pit is thin or unnecessary. Therefore, the stance of the pillar 30 (the installation interval of the seismic isolation device 16 supporting the pillar 30) can be increased. As a result, the tower ratio of the building 10 is reduced, and the pulling force acting on the columns 30 and the seismic isolation device 16 at the time of an earthquake can be reduced.

Further, in the building 10 of the present embodiment, as shown in FIG. 2, by constructing the foundation portion 14 of the building 10 based on the existing foundation portion 22, the construction time for constructing the foundation portion 14 is reduced, and the construction period is reduced. It can be shortened and the construction cost can be reduced.

The embodiment of the present invention has been described above.

In the present embodiment, as shown in FIG. 1, an example in which the superstructure 18 is made of reinforced concrete is shown, but the superstructure 18 is made of reinforced concrete, steel frame, steel-framed reinforced concrete, or CFT (Concrete-). It may have various structures and scales such as Filled Steel Tube (filled steel pipe concrete structure) and a mixed structure thereof.

Further, in the present embodiment, as shown in FIG. 1, an example is shown in which the rigid frame frame 24 constitutes the lower layer portion 32 of the upper structure 18, but the lower layer portion of the upper structure is a seismic isolation layer. The effect of this embodiment (lowering the center of gravity of the superstructure and reducing the overturning moment acting on the superstructure during an earthquake to a predetermined value or less by forming the lower layer of the supported superstructure and being composed of the rigid frame frame. Means one or more floors from which) is obtained. For example, the first floor or the first and second floors of the superstructure supported by the foundation portion are the lower layers of the superstructure.

Further, in the present embodiment, as shown in FIG. 1, the ramen frame 24 includes a column 30 having a cross-sectional area larger than the cross-sectional area of the column 34 and a beam 28 having a cross-sectional area larger than the cross-sectional area of the beam 36. Although the example provided is shown, the ramen frame has a cross-sectional area larger than the cross-sectional area of the upper column provided on the floor above the lower layer portion 32, and is provided on the floor above the lower layer portion 321. It may be heavier than the column-beam frame for each floor. For example, the rigid frame frame 24 may have a plurality of spans.

Further, in the present embodiment, as shown in FIG. 2, the floor portion 26 is made of a beam 40 erected between the columns 30 by pin-joining the ends to the columns 30 and a reinforced concrete structure provided on the beams 40. An example of the configuration with the floor slab 42 is shown. For example, the column 30 has a cross-sectional area smaller than the cross-sectional area of the upper beam provided on the floor above the lower layer 32 of the superstructure 18. A floor portion may be formed by having a beam as a beam member erected between them and a floor slab 42 provided on the beam.

Further, for example, as in the building 50 shown in the front view of FIG. 4, the end portion is rigidly joined to the pillar 52 as a pillar member constituting the ramen frame 54 and erected on the pillar 52, and the cross-sectional area of the end portion is the center. The floor portion 58 may be formed by having a beam 56 made of H-shaped steel as a beam member smaller than the cross-sectional area of the portion and a floor slab 42 provided on the beam 56. That is, in the floor portion 58, the end portion of the beam 56 has a haunch shape.

In the floor portion 58, since the end portion of the beam 56 is rigidly joined to the column 52, the stress load on the column 52 is reduced, and the cross section of the column 52 can be reduced. Further, since the end portion of the beam 56 has a haunch shape, the average rigidity of the beam 56 can be increased while increasing the installation level of the seismic isolation device 16.

Further, for example, the floor portion may be formed by having a reinforced concrete floor slab (so-called flat slab) erected between the columns 30. That is, the floor portion may be composed of only the floor slab.

Even if the floor portion is configured as described above, the bending moment generated at the end portion of the floor portion during an earthquake can be reduced. Therefore, the beam member that supports the floor slab can be made into a beam having a small beam cross section and a small beam formation, or the beam member that supports the floor slab can be eliminated.

Further, in the present embodiment, as shown in FIG. 2, an example in which the beam 40 constituting the floor portion 26 is formed of H-shaped steel is shown, but the beams constituting the floor portion are made of reinforced concrete, steel-framed reinforced concrete, or the like. It may have any structure.

Further, in the present embodiment, as shown in FIG. 1, an example in which the building 10 is a seismic isolated building is shown, but the building may be a building without a seismic isolation device. In this case, it is possible to reduce the pulling force acting on the support piles that support the column members constituting the rigid frame frame during an earthquake.

Further, in the present embodiment, as shown in FIG. 2, an example in which the foundation portion 14 is constructed on the existing foundation portion 22 of the demolished building is shown, but the demolished building is as shown in the front view of FIG. The foundation unit 60 may be newly installed without using the existing foundation unit of the above.

Further, in the present embodiment, as shown in FIG. 1, the building 10 is a foundation seismic isolation building in which the superstructure 18 is supported by the seismic isolation device 16 installed on the foundation portion 14 as the substructure. Although an example is shown, the building may be a middle-rise seismic isolated building. That is, the substructure is the structure below the intermediate seismic isolation layer of the intermediate layer seismic isolation building, and the lower part of the upper structure supported by the seismic isolation device installed on this substructure is a heavy ramen. It may be configured by a frame.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

10, 50, 62 Buildings 14, 60 Foundations (substructures)
16 Seismic isolation device 18 Superstructure 22 Existing foundation 24, 54 Rahmen frame 26, 58 Floor 30, 52 Pillars (pillar members)
32 Lower layer 34 Pillars (upper pillars)
36 beam (upper beam)
40 beam (beam member)
42 Floor slab 56 Beam (beam member)

Claims (4)

Substructure and
An upper structure that is supported by the lower structure and has a ramen frame in which the cross-sectional area of the column members in the lower layer portion is larger than the cross-sectional area of the upper pillars provided on the floor above the lower layer portion.
The floor erected at the lower end of the pillar member and
With
The floor is
A beam member erected between the column members and having a smaller cross-sectional area than the upper beam erected on the upper column, and a floor slab provided on the beam member.
Beam members erected between the column members and whose ends are pin-joined to the column members and floor slabs provided on the beam members.
A beam member erected between the column members and rigidly joined to the column member having a cross-sectional area smaller than the cross-sectional area of the central portion, and a floor slab provided on the beam member.
Or a floor slab erected between the pillar members,
A building that is either. Substructure and
An upper structure that is supported by the lower structure and has a ramen frame in which the cross-sectional area of the column members in the lower layer portion is larger than the cross-sectional area of the upper pillars provided on the floor above the lower layer portion.
The floor and
With
The floor is
Bridges the said post member, a floor slab provided on said pillars bridged been cross-sectional area is smaller beam member and the beam member on from the upper beam, building. The building according to claim 1 or 2 , which is installed in the substructure and has a seismic isolation device for supporting the pillar member. The building according to any one of claims 1 to 3, wherein the substructure is a foundation portion constructed on an existing foundation portion.

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