JP2021134561A - Frame structure - Google Patents

Abstract

To reduce a member cross section of a column-beam frame compared to the column-beam frame in which a long-term load is born by a woody structural material.SOLUTION: A frame structure 14 includes: a first incombustible column-beam frame 100 receiving a vertical load from a slab 50; and a second woody column-beam frame 200 which covers an outer surface 102 of the first column-beam frame 100 and has horizontal rigidity larger than the first column-beam frame 100, and is provided so as to be structurally insulated from the first column-beam frame 100 and the slab 50.SELECTED DRAWING: Figure 3

Description

The present invention relates to a frame structure.

Patent Document 1 discloses a technique relating to a fire-resistant structural member used for columns and beams that support a building. In this prior art, a columnar core material that receives a load and a sheath material that covers the outer peripheral portion of the core material along the longitudinal direction are provided. The sheath material is made of wood that is integrally molded into a square tubular shape and has been subjected to a flame retardant treatment, and the outer peripheral portion of the core material is fitted to the inner peripheral portion of the square tubular sheath material.

Patent Document 2 discloses a technique relating to an unbonded synthetic axial force member of a wood and a metal member. In this prior art, wood is synthesized in an unbonded state at a position where buckling of the metal member is prevented, and both ends of the metal member protruding from the end portion of the wood are configured as input portions of axial force.

Patent Document 3 discloses a technique relating to a column-beam joint structure formed by joining a wooden hybrid column made of steel-framed concrete and a wooden panel covering the periphery thereof and a steel-framed beam. In this prior art, the wooden panels are arranged so that they do not come into direct contact with the steel beams at the column-beam joints.

Patent No. 6469925 Patent No. 3661059 Japanese Unexamined Patent Publication No. 2019-44514

In the column-beam frame whose core material is composed of flammable wood structural material, the wood core material mainly bears the long-term load. Therefore, it is necessary to make the cross section of the member larger than that of the structural material made of reinforced concrete or the like.

In addition, in the event of a fire, in order to protect the flammable wood core material, which bears a long-term load, from the heat of the fire, it is necessary to secure a sufficient thickness of the covering material that covers the core material composed of the wood fuel margin layer and the like. be.

Therefore, the column-beam frame whose core material is made of a wooden structural material has a larger member area than the frame made of a structural material such as reinforced concrete.

In view of the above facts, an object of the present invention is to reduce the cross section of a member of a column-beam frame as compared with a column-beam frame in which a long-term load is borne by a wooden structural material.

The first aspect is a nonflammable first column beam frame that receives a vertical load from a slab, and covers the outer surface of the first column beam frame, has a larger horizontal rigidity than the first column beam frame, and has the first column beam. It is a frame structure including a frame and a wooden second column beam frame structurally insulated from the slab.

In the frame structure of the first aspect, since the nonflammable first column beam frame is covered with the wooden second column beam frame, the design is improved as a wooden building. The non-combustible first column beam frame receives a vertical load from the slab, that is, the first column beam frame bears a long-term load. Since the wooden second column beam frame is structurally insulated from the first column beam frame and the slab, it receives or hardly receives the vertical load from the slab, that is, the second column beam frame bears a long-term load. No or little burden.

On the other hand, the wooden second column beam frame with high horizontal rigidity mainly bears the load during an earthquake, and the nonflammable first column beam frame structurally insulated from the second column beam frame with low horizontal rigidity during an earthquake. The load burden is small.

In this way, the nonflammable first column beam frame mainly bears the long-term load, and the wooden second column beam frame mainly bears the load during an earthquake. Further, in the event of a fire, even if the wooden second column beam frame burns and disappears, the nonflammable first column beam frame remains unburned and becomes independent.

Therefore, the first column-beam frame may have a member cross section capable of bearing a long-term load, and the second column-beam frame may have a member cross section capable of bearing a load during an earthquake, which is efficient. It can be a member cross section. Therefore, the cross section of the column-beam frame can be reduced as compared with the case where the wooden structural material bears the long-term load.

The second aspect is described in the first aspect, wherein the second column beam frame is structurally insulated from the first column beam frame and the slab by providing a gap or an insulating material. It is a frame structure.

In the frame structure of the second aspect, the second column beam frame, the first column beam frame and the slab are provided by providing a gap or an insulating material between the second column beam frame and the first column beam frame and the slab. Structurally easily insulated.

The third aspect is the frame structure according to the first aspect or the second aspect, wherein the first column-beam frame is composed of any of reinforced concrete, steel-framed reinforced concrete, and steel frame.

In the frame structure of the third aspect, the reinforced concrete, the steel-framed reinforced concrete, and the steel frame are superior to the wood material in the performance against the compressive force. Therefore, by constructing the nonflammable first column-beam frame that bears a long-term load with any of reinforced concrete, steel-framed reinforced concrete, and steel frame, the cross section of the column-beam frame can be further reduced.

According to the present invention, it is possible to reduce the cross section of the member of the column-beam frame as compared with the column-beam frame in which the long-term load is borne by the wooden structural material.

It is a perspective view of the first column beam frame which constitutes the frame of a building. It is a perspective view of the second column beam frame which constitutes the frame of a building. It is a perspective view of a frame and a slab constituting a building. It is a perspective view which shows the joint part of the 1st column beam frame which constitutes the frame of a building, and the vicinity thereof with a partial cross section. It is a perspective view which shows the joint part of the 2nd column beam frame which constitutes the frame of a building, and the vicinity thereof with a partial cross section. It is a perspective view which shows the joint part of the frame which constitutes a building, and the vicinity thereof with a partial cross section. FIG. 6 is a perspective view showing a slab. It is a horizontal cross-sectional view of the pillar which constitutes the frame of a building. It is a vertical cross-sectional view along the Y direction of the beam and the slab which make up the frame of a building. It is a perspective view of the frame and the slab of the first modification. It is a vertical cross-sectional view along the Y direction of the beam and the slab which form the frame of the 2nd modification.

<Embodiment>
The frame structure of one embodiment of the present invention will be described. The vertical direction is the Z direction, and the two directions orthogonal to each other in the horizontal direction orthogonal to the vertical direction are the X direction and the Y direction.

[composition]
First, the configuration of the frame of the building to which the frame structure of the present embodiment is applied will be described.

The frame 12 of the building 10 shown in FIG. 3 is composed of columns 20 (see FIG. 8) and beams 30 (see FIG. 9). The frame structure 14 of the frame 12 is a reinforced concrete first column beam frame 100 (see FIGS. 1, 4 and 6) and a wooden second column beam frame 200 (FIGS. 2, 5 and 6). 6) and.

As shown in FIG. 6, the wooden second column beam frame 200 (see FIGS. 2 and 5) covers the outer surface 102 (see FIGS. 1 and 4) of the first column beam frame 100, and the first column beam frame It has a higher horizontal rigidity than 100, and is structurally insulated from the first beam frame 100 and the slab 50 (FIGS. 3, 7, and 9) described later.

The horizontal rigidity ratio between the second column beam frame 200 and the first column beam frame 100 in the present embodiment is about 10: 1, but is not limited to this.

As shown in FIGS. 1, 4 and 6, the first column beam frame 100 is composed of a first column 120 (see FIG. 8) and a first beam 130 (see FIG. 9) made of reinforced concrete.

As shown in FIGS. 2, 5 and 6, the second column beam frame 200 is composed of a wooden second column 220 (see FIG. 8) and a second beam 230 (see FIG. 9). The wooden second pillar 220 and the second beam 230 in the present embodiment are joined by a plate (not shown) and a drift pin embedded across the second pillar 220 and the second beam 230. It is not limited.

In the present embodiment, the wood constituting the wooden second column beam frame 200 (woody second column 220 and second beam 230) has not been flame-retardant or non-flammable. A flame-retardant treatment or a non-flammable treatment may be performed.

Further, as the wood constituting the wooden second pillar beam frame 200 (woody second pillar 220 and second beam 230) of the present embodiment, solid wood, laminated wood, single plate laminated material, orthogonal laminated wood, or the like is used. be able to.

As shown in FIGS. 6 and 8, the pillar 20 is made of wood that covers the above-mentioned first pillar 120 made of reinforced concrete constituting the core material and the outer peripheral surface 122 (see FIGS. 1 and 4) of the first pillar 120. It is composed of the above-mentioned second pillar 220 and. Then, a gap 252 is formed between the outer peripheral surface 122 of the first pillar 120 (see FIGS. 1 and 4) and the inner peripheral surface 222 of the second pillar 220 (see FIGS. 2 and 5), and the gap 252 fills the gap 252. Is provided with a styrofoam material 250 as an example of an insulating material. As a result, the first pillar 120 and the second pillar 220 in the pillar 20 are structurally insulated, and they do not have oneness.

As shown in FIGS. 6 and 9, the beam 30 includes the above-mentioned first beam 130 made of reinforced concrete constituting the core material, the outer surface 131 (see also FIG. 4) of the first beam 130, and the bottom surface 132 (FIG. 4). It is composed of the above-mentioned wooden second beam 230 (see also FIG. 5) that covers the above-mentioned woody second beam 230 (see also FIG. 5). The second beam 230 has a groove shape with an opening on the upper side (see also FIG. 5).

The outer surface 131 of the first beam 130 and the inner surface 231 (see FIG. 5) of the second beam 230 are in contact with each other in a non-joined state. However, a gap 262 is formed between the bottom lower surface 132 of the first beam 130 and the bottom upper surface 232 (see FIG. 5) of the second beam 230, and the styrofoam material 260 as an example of the insulating material is formed in the gap 262. It is provided. As a result, the first beam 130 and the second beam 230 in the beam 30 are structurally insulated, and they do not have oneness.

The joint between the first column 120 and the first beam 130 and the joint between the second column 220 and the second beam 230 may have any joint structure, for example, pin joint, semi-rigid joint and rigid. Any joint structure may be used.

As shown in FIGS. 3, 7, and 9, a reinforced concrete slab 50 is provided on the beam 30 of the frame 12 of the building 10.

As shown in FIGS. 7 and 9, the slab 50 is joined to the upper surface 133 of the first beam 130 made of reinforced concrete. However, in the slab 50, a gap 272 is formed between the slab 50 and the upper surface 233 of the second wooden beam 230, and the styrofoam material 270 as an example of the insulating material is provided in the gap 272. As a result, the reinforced concrete first beam 130 constituting the beam 30 receives the load of the slab 50, and the wooden second beam 230 constituting the beam 30 is structurally insulated from the slab 50, and both have integrity. Not.

The slab 50 is not specified as a reinforced concrete structure. The slab 50 may be made of, for example, a lightweight cellular concrete panel, a wooden board, or the like.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

In the frame 12 of the building 10, since the nonflammable first column beam frame 100 is covered with the wooden second column beam frame 200, the design is improved as the wooden building 10.

Further, the non-combustible first column beam frame 100 receives a vertical load from the slab 50, that is, the first column beam frame 100 bears a long-term load.

However, since the wooden second column beam frame 200 is structurally insulated from the first column beam frame 100 and the slab 50, it receives or hardly receives the vertical load from the slab 50, that is, the second column beam. The frame 200 bears little or little long-term load.

By sufficiently securing a gap 272 between the upper surface 133 of the second beam 230 constituting the second beam frame 200 and the slab 50, it is possible to receive or hardly receive the vertical load from the slab 50. Further, the gap 272 that can receive or hardly receive the vertical load from the slab 50 can be obtained by calculating the deflection of the slab 50.

On the other hand, the wooden second column beam frame 200 having high horizontal rigidity mainly bears the load during an earthquake, and the nonflammable first column beam frame 100 structurally insulated from the second column beam frame 200 with low horizontal rigidity. Has less load during an earthquake.

Here, the seismic load borne by the second column beam frame 200 and the first column beam frame 100 is basically a horizontal rigidity ratio. In the present embodiment, the horizontal rigidity ratio between the second column beam frame 200 and the first column beam frame 100 is about 10: 1, so that the earthquake borne by the second column beam frame 200 and the first column beam frame 100 The load ratio is also about 10: 1.

The seismic load borne by the second column beam frame 200 and the first column beam frame 100 is not determined only by the horizontal rigidity ratio. For example, it is also affected by the joint structure of the first column 120 and the first beam 130 and the joint structure of the second column 220 and the second beam 230, for example, pin joint, semi-rigid joint, rigid joint and the like.

As described above, the nonflammable first column beam frame 100 mainly bears the long-term load, and the wooden second column beam frame 200 mainly bears the load during an earthquake. Further, in the event of a fire, even if the wooden second column beam frame 200 burns and disappears, the nonflammable first column beam frame 100 remains unburned and the building 10 becomes independent.

Therefore, the first column beam frame 100 may have a member cross section capable of bearing a long-term load. In other words, the first column 120 and the first beam 130 may have a member cross section capable of bearing a long-term load.

On the other hand, the second column beam frame 200 may have a member cross section capable of bearing a load during an earthquake. In other words, the second pillar 220 and the second beam 230 need only have a member cross section that can bear the load during an earthquake.

Therefore, in the first column beam structure 100 and the second column beam structure 200, in other words, the first column 120, the first beam 130, the second column 220, and the second beam 230 have efficient member cross sections, respectively. This makes it possible to reduce the cross section of the members of the frame 12, that is, the cross sections of the members of the columns 20 and the beams 30, as compared with the case where the core material bears the long-term load by the combustible wood structural material.

Further, since the first column 120 and the first beam 130 constituting the first column beam frame 100 are made of reinforced concrete, which has better performance against compressive force than the wood material, the first column beam frame bears a long-term load. The member cross section of 100 can be reduced.

Further, by providing the foamed styrol materials 250, 260, and 270 in the gaps 252, 262, and 272 between the second column beam frame 200 and the first column beam frame 100 and the slab 50, the second column beam frame 200 can be obtained. , The first column beam frame 100 and the slab 50 can be easily structurally insulated.

[Modification example]
Next, a modified example of this embodiment will be described.

(First modification)
In the frame structure 15 of the frame 13 of the first modified example shown in FIG. 10, a square cane 280 is provided on the second column beam frame 200. Specifically, a square cane 280 joined to the second pillar 220 and the second beam 230 forming the frame structure 15 is provided in the vicinity of the joint portion.

By providing the square cane 280 on the second column beam frame 200 in this way, the horizontal rigidity of the second column beam frame 200 is increased. Therefore, it is possible to increase the load at the time of an earthquake that can be borne by the second column beam frame 200 while suppressing the cross section of the member.

(Second modification)
In the frame structure 19 of the frame 17 of the second modified example shown in FIG. 11, the first beam 330 constituting the first column beam frame 101 is composed of a steel frame and H-shaped steel in the present modified example. The first column 120 (see FIG. 1) constituting the first column beam frame 101 is made of reinforced concrete.

The beam 31 constituting the frame 17 is composed of the first beam 330 made of the above-mentioned H-shaped steel, the second beam 230 made of wood, and the beam side portion 350.

The first beam 330 made of H-shaped steel supports the load of the slab 50 on the upper surface 333 of the upper flange 332. A stud or the like to be embedded in the slab 50 may be provided on the upper surface 333 of the flange 332 on the upper side of the first beam 330.

Further, a gap 262 is formed between the lower surface 331 of the flange 332 on the lower side of the first beam 330 and the bottom upper surface 232 of the second beam 230, and the styrofoam material 260 as an example of the insulating material is formed in the gap 262. It is provided.

The beam side portion 350 is provided between the upper and lower flanges 332 on both sides of the web 334 of the first beam 330 made of H-shaped steel, and is used for concrete, cement, mortar, gypsum, gypsum board, caucal plate, rock wool, etc. It is composed of heat resistant material.

In this way, by providing the beam side portions 350 made of heat-resistant material between the upper and lower flanges 332 on both sides of the web 334 of the first beam 330, the fire resistance performance of the first beam 330 made of H-shaped steel can be improved. improves.

<Others>
The present invention is not limited to the above embodiment.

For example, in the above embodiment, the nonflammable first column beam frame 100 is made of reinforced concrete, but is not limited thereto. It may be a steel-framed reinforced concrete structure or a steel-framed structure. Alternatively, it may be composed of a non-combustible material other than reinforced concrete, steel-framed reinforced concrete and steel-framed reinforced concrete. From another point of view, the first beam frame 100 may be replaced with another material as long as the nonflammability and the support of the vertical load can be guaranteed. Further, the first pillar and the first beam may be made of different materials. The above-mentioned second modification is an example in which the first column and the first beam are made of different materials.

Here, when at least one of the first column and the first beam constituting the first column beam frame 100 is made of a steel frame material, the steel frame material may require a fireproof coating or the like. The beam side portion 350 of the second modification described above functions as a fireproof coating.

Further, for example, in the above embodiment, the firing styrol materials 250, 260, and 270 are provided in the gaps 252, 262, and 272 between the second beam frame 200 and the first beam frame 100 and the slab 50. The second column beam frame 200 and the first column beam frame 100 and the slab 50 are structurally insulated, but the present invention is not limited thereto. An insulating material other than the styrofoam material 250, 260, 270, for example, urethane sponge or the like may be used.

Further, only gaps 252, 262, and 272 are provided between the second column beam frame 200 and the first column beam frame 100 and the slab 50, and the second column beam frame 200, the first column beam frame 100, and the slab 50 are provided. And may be structurally insulated. In short, the structure may be such that the load is hardly or hardly transmitted between the second column-beam frame 200 and the first column-beam frame 100 and the slab 50.

Further, it can be carried out in various embodiments without departing from the gist of the present invention. The embodiments, modifications, and the like can be combined and implemented as appropriate.

10 Building 12 Frame 13 Frame 14 Frame Structure 15 Frame Structure 17 Frame 19 Frame Structure 20 Pillar 30 Beam 31 Beam 50 Slab 100 First Pillar Beam Frame 101 First Pillar Beam Frame 102 Outer Surface 120 First Pillar 130 First Beam 200 Second Beam Beam frame 220 Second pillar 230 Second beam 250 Foamed styrol material (an example of insulating material)
252 Gap 260 Styrofoam material (an example of insulating material)
262 Gap 270 Styrofoam material (an example of insulating material)
272 Gap 280 Square Wand 330 First Beam

Claims (3)

A non-combustible first column beam frame that receives a vertical load from the slab,
A wooden second column beam frame that covers the outer surface of the first column beam frame, has higher horizontal rigidity than the first column beam frame, and is structurally insulated from the first column beam frame and the slab. When,
Frame structure with. The second column beam frame is structurally insulated from both of the first column beam frame and the slab by providing a gap or an insulating material.
The frame structure according to claim 1. The first column-beam frame is composed of any of reinforced concrete, steel-framed reinforced concrete, and steel frame.
The frame structure according to claim 1 or 2.

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