JP6893167B2 - Vibration control structure of wooden frame - Google Patents

Description

The present invention relates to a vibration damping structure of a wooden frame.

Patent Document 1 below shows a configuration in which a damping brace is attached to a rectangular frame structure portion of a wooden building.

Japanese Unexamined Patent Publication No. 2008-144387

If a damping brace is attached to the frame as in Patent Document 1 above in order to absorb the vibration of an earthquake in a wooden building, the portion to which the damping brace is attached cannot pass. In addition, it has a great influence on the appearance.

In view of the above facts, an object of the present invention is to provide a vibration damping structure of a wooden frame capable of absorbing the vibration of an earthquake without using a vibration damping brace.

The vibration damping structure of the wooden frame according to claim 1 is arranged on a wooden pillar, a wooden horizontal member bridged over the pillar, and a frame surface of the pillar and the frame formed of the horizontal member. A steel-framed reinforcing frame having a vertical frame along the column and a horizontal frame along the horizontal frame, and surrendered from the vertical frame and the horizontal frame arranged at a joint portion between the vertical frame and the horizontal frame. It has a low-strength portion with low strength.

According to the vibration damping structure of the wooden frame of claim 1, when a horizontal force acts on the frame during an earthquake, the columns and the horizontal members are displaced. As a result, the joint between the vertical frame and the horizontal frame of the reinforcing frame is deformed so as to open or close. At the joint between the vertical frame and the horizontal frame, a low-strength portion having a yield strength smaller than that of the vertical frame and the horizontal frame is arranged. Therefore, the joint portion is likely to be plastically deformed as compared with a configuration in which the yield strength of the joint portion between the vertical frame and the horizontal frame is equal to or higher than that of the vertical frame and the horizontal frame. Therefore, the seismic energy absorption effect is likely to be exhibited. As described above, in the vibration damping structure of the wooden frame of claim 1, vibration damping can be performed without bridging a brace over the frame surface of the frame.

In the vibration damping structure of the wooden frame of claim 2, the low-strength portion is made of low-yield point steel and is welded to the vertical frame and the horizontal frame.

According to the vibration damping structure of the wooden frame of claim 2, when a horizontal force acts on the frame during an earthquake, the low yield point steel welded to the vertical frame and the horizontal frame yields. As a result, the low yield point steel can exhibit a high seismic energy absorption effect while being plastically deformed.

In the vibration damping structure of the wooden frame of claim 3, at least the vertical frame is fixed to the pillar, or at least the horizontal frame is fixed to the horizontal member.

In the vibration damping structure of the wooden frame of claim 3, the vertical frame is fixed to the pillar. Alternatively, the horizontal frame is fixed to the horizontal member. Therefore, the vertical frame or the horizontal frame can easily follow the displacement of the frame. Therefore, the low-strength portion arranged at the joint portion of the vertical frame and the horizontal frame is easily deformed, and the seismic energy absorption effect is likely to be exhibited.

According to the vibration damping structure of the wooden frame according to the present invention, the vibration of an earthquake can be absorbed without using the vibration damping brace.

It is an elevation view which shows the vibration damping structure of the wooden frame which concerns on 1st Embodiment of this invention. It is a partially enlarged sectional view which shows the vibration damping structure of the wooden frame which concerns on 1st Embodiment of this invention. (A) is an elevational view showing a state in which the wooden frame according to the first embodiment of the present invention is deformed by seismic force, and (B) is a portion showing a state in which the joint portion between the vertical frame and the horizontal frame is deformed. It is an enlarged elevation view, and (C) is a partially enlarged elevation view showing a state in which a joint portion different from (B) is deformed. It is an elevation view which shows the vibration damping structure of the wooden frame which concerns on 2nd Embodiment of this invention. (A) is a partially enlarged cross-sectional view showing a modified example in which the vertical frame, the horizontal frame and the joint portion are formed of the same material in the vibration damping structure of the wooden frame according to the embodiment of the present invention, and (B) is a vertical frame. , Is a partially enlarged cross-sectional view showing a modified example in which a horizontal frame and a low-strength portion are formed of a square steel pipe.

[First Embodiment]
(Wooden frame)
As shown in FIG. 1, the wooden frame according to the first embodiment of the present invention is formed of a pillar 12 and a beam 14 as a horizontal member bridged over the pillar 12 in a building 10 which is a wooden building. It is a frame that has been constructed. The building 10 is an existing temple and shrine building, and the pillar 12 is a wooden round pillar erected on a bunch of stones 16. Further, a doo 20 is installed on the top of the pillar 12 via a pedestal 18. The dougong 20 is a structure that supports the load of an eaves (not shown). The beam 14 is a structural material of the building 10 and is also referred to as a nuki, but in the present specification, it is referred to as a beam for the sake of clarity.

(Damping structure)
The vibration damping structure of the wooden frame according to the first embodiment is a seismic force absorbing mechanism applied to the structure surface H1 of the frame formed by the columns 12 and the beams 14, and is applied for seismic reinforcement of the building 10. To. The structure surface H1 is a plane along the horizontal direction (X direction) and the vertical direction (H direction) shown in FIG.

A reinforcing frame 30 is arranged in the structure surface H1. The reinforcing frame 30 is a three-sided frame-shaped reinforcing frame including a vertical frame 32, a horizontal frame 34, and a low-strength portion 36 which is a joint portion between the vertical frame 32 and the horizontal frame 34.

The vertical frame 32 is made of solid steel. Further, the vertical frame 32 is arranged in the vertical direction along the side surface (end surface in the X direction) of the pillar 12, the lower end portion 32A is in contact with the boulder 16, and the upper end portion 32B is welded to the low strength portion 36. Further, as shown in FIG. 2, the vertical frame 32 is fixed to the pillar 12 at regular intervals in the vertical direction by using the lug screw S.

Like the vertical frame 32, the horizontal frame 34 is made of solid steel. Further, the horizontal frame 34 is arranged in the lateral direction (X direction) along the lower end surface of the beam 14, and the end portions 34B on both sides are welded to the low-strength portion 36, respectively. Further, the horizontal frame 34 is fixed to the beam 14 at regular intervals in the lateral direction by using a lug screw S.

The low-strength portion 36 is formed of a solid material of low yield point steel having a yield strength smaller than that of the steel material forming the vertical frame 32 and the horizontal frame 34. The low-strength portion 36 is formed in a substantially L-shape along the entrance corner of the column 12 and the beam 14. Specifically, the low-strength portion 36 is formed of a first portion 36H along the vertical direction (H direction) and a second portion 36X along the lateral direction (X direction). The second portion 36X is formed so as to project laterally from the upper end portion of the first portion 36H. In this specification, the low-strength portion 36 is referred to as the first portion 36H on the lower side of the alternate long and short dash line shown in FIG. 2 and the second portion 36X on the upper side.

(Action / effect)
As shown in FIG. 3A, when a horizontal force P acts on the building 10 from the left side (L direction) to the right side (R direction) at the time of an earthquake or the like, the pillar 12 is displaced so as to fall in the R direction. At this time, since the vertical frame 32L is fixed to the left side surface of the pillar 12, it receives a tensile force from the pillar 12 and is displaced so as to fall in the R direction. Since the vertical frame 32R is fixed to the right side surface of the pillar 12, it receives a pressing force from the pillar 12 and is displaced so as to fall in the R direction.

Further, the horizontal force P causes the beam 14 to be displaced in the R direction. As a result, the horizontal frame 34 fixed to the beam 14 is also displaced in the R direction.

Here, the low-strength portion 36 joined to the vertical frame 32R is referred to as a low-strength portion 36R, and the low-strength portion 36 joined to the vertical frame 32L is referred to as a low-strength portion 36L. As shown in FIG. 3B, the first portion 36H and the second portion 36X in the low-strength portion 36R are deformed so as to be separated from each other (so that the mutual angle θ1 is widened). Since the low-strength portion 36R is made of low-yield point steel, it yields and undergoes plastic deformation when deformed by a certain amount. This absorbs seismic energy.

Further, as shown in FIG. 3C, the first portion 36H and the second portion 36X in the low-strength portion 36L are deformed so as to approach each other (so that the mutual angle θ2 is narrowed). Since the low-strength portion 36L is made of low-yield point steel, it yields and undergoes plastic deformation when deformed by a certain amount. This absorbs seismic energy.

Further, since external forces are alternately applied to the building 10 from the left and right during an earthquake, the low-strength portion 36R and the low-strength portion 36L are both deformed by repeatedly contacting and separating the first portion 36H and the second portion 36X. Seismic energy is absorbed by this deformation.

Further, in the present embodiment, as shown in FIG. 2, the vertical frame 32 and the horizontal frame 34 are fixed to the columns 12 and the beams 14 by lag screws S, respectively. Therefore, the reinforcing frame 30 can easily follow the displacement of the columns 12 and beams 14 during an earthquake. As a result, the low-strength portion 36 is easily deformed.

Further, the building 10 in the present embodiment is a temple and shrine building. In temple and shrine buildings, the openings are often larger than in buildings for other purposes. For this reason, when damping using a brace or the like, the brace is conspicuous and spoils the aesthetic appearance. On the other hand, according to the vibration damping structure according to the present embodiment, since the diagonal member such as a brace is not used, the influence on the appearance of the building 10 can be reduced. Further, since the reinforcing frame 30 has a three-sided frame shape, it is unlikely to hinder passage on the structure surface H1.

[Second Embodiment]
In the first embodiment, the reinforcing frame 30 is a three-sided frame and the horizontal frame 34 is fixed to the beam 14, but the reinforcing frame 40 in the second embodiment is a four-sided frame, and the horizontal frame 34 is a lintel 24 described later. And fixed to the threshold 28. Hereinafter, the vibration damping structure of the wooden frame according to the second embodiment will be described, but the same reference numerals will be given to the same configurations as those of the first embodiment, and the description thereof will be omitted as appropriate.

In the building 11 shown in FIG. 4, a long push 22 is bridged between the pillars 12 below the beam 14. The long press 22 is a structural material that also serves as a decorative material, and is joined to the pillar 12. A lintel 24 is joined to the lower part of the long press 22. Further, a beam (penetration) 26, which is a structural material, is bridged over the lower part of the column 12 and joined to the column 12, and a sill 28 is joined to the lower part of the beam 26.

Since the lintel 24 is joined to the long press 22, it can be displaced following the long press 22. Further, since the threshold 28 is joined to the beam 26, it can be displaced following the beam 26.

In the second embodiment, the reinforcing frame 40 is arranged on the structure surface H2 surrounded by the pillar 12, the lintel 24, and the sill 28. In the reinforcing frame 40, the horizontal frame 34 is joined to each of the lintel 24 and the sill 28. Further, the low-strength portions 36 are arranged at both ends of the respective horizontal frames 34 arranged vertically. As a result, the reinforcing frame 40 has a four-sided frame shape.

In the second embodiment, the horizontal frame 34 is not directly joined to the long push 22 and the beam 26, which are structural materials, but is joined via the lintel 24 and the sill 28. Even if the horizontal frame 34 is not directly joined to the long push 22 and the beam 26, the displacement of the long push 22 and the beam 26 can be followed in the event of an earthquake. As described above, the "horizontal material" in the present invention includes a structural material and a member joined to the structural material.

Further, in the second embodiment, the reinforcing frame 40 has a square frame shape. Therefore, the number of low-strength portions 36 is larger than that in the case of the three-sided frame shape, and the seismic energy absorption performance is high.

The horizontal frame 34 may be embedded in the threshold 28. Alternatively, by raising the floor in front of and behind the horizontal frame 34 (in the front-rear direction of the paper surface in FIG. 4), the horizontal frame 34 can be prevented from obstructing passage.

[Modification example]
In the above embodiment, as shown in FIG. 2, the vertical frame 32 is fixed to the pillar 12 with the lug screw S, but the embodiment of the present invention is not limited to this, and the vertical frame 32 is fixed to the pillar 12. It does not have to be. Even if the vertical frame 32 is not fixed to the pillar 12, the low-strength portion 36R can be displaced so as to fall when pressed from the pillar 12 by the horizontal force P as in the vertical frame 32R in FIG. 3 (A), for example. It can be transformed.

Further, in the above embodiment, as shown in FIG. 2, the horizontal frame 34 is fixed to the beam 14 with the lug screw S, but the embodiment of the present invention is not limited to this, and the horizontal frame 34 is attached to the beam 14. It does not have to be fixed. Even if the horizontal frame 34 is not fixed to the beam 14, both end portions 34B of the horizontal frame 34 are welded to the low-strength portion 36, so that the horizontal frame 34 is displaced by the horizontal force P as in the horizontal frame 34 in FIG. To do.

As described above, the vertical frame 32 and the horizontal frame 34 are arbitrarily fixed, but from the viewpoint of vibration damping performance, it is preferable to fix at least one of the vertical frame 32 and the horizontal frame 34 to the column 12 or the beam 14. Further, it is more preferable to fix at least the vertical frame 32 to the pillar 12.

Further, the method of fixing the vertical frame 32 and the column 12 and the method of fixing the horizontal frame 34 and the beam 14 are not limited to the lug screw, and a bolt or an adhesive may be used. Further, the fixing interval does not necessarily have to be constant, and the fixing location may be only one location.

Further, in the above embodiment, low yield point steel is used as the low strength portion 36, but the embodiment of the present invention is not limited to this. For example, as in the reinforcing frame 50 shown in FIG. 5A, the vertical frame 52, the horizontal frame 54, and the low-strength portion 56 may be formed by using the same steel material. In this case, the cross-sectional dimensions of the low-strength portion 56 (dimensions W1 and W2 shown in FIG. 5A) are made smaller than the cross-sectional dimensions of the vertical frame 52 and the horizontal frame 54. As a result, the low-strength portion 56 is more easily plastically deformed than the vertical frame 52 and the horizontal frame 54.

Further, as in the reinforcing frame 60 shown in FIG. 5B, the vertical frame 62 and the horizontal frame 64 are formed of square steel pipes P1 and P2, respectively, and the low-strength portion 66 is formed of steel pipes P3 and P4. May be good. The steel pipe P3 and the steel pipe P4 are formed to be thinner and have lower strength than the steel pipe P1 and the steel pipe P2. The contact surface E1 between the steel pipe P1 and the steel pipe P3 is welded, the contact surface E2 between the steel pipe P2 and the steel pipe P4 is welded, and the contact surface E3 between the steel pipe P3 and the steel pipe P4 is welded. As a result, the low-strength portion 66 is more easily plastically deformed than the vertical frame 62 and the horizontal frame 64.

Furthermore, although the reinforcing frames 30, 40, 50, and 60 of the above-described embodiment are used for seismic retrofitting of an existing building, the embodiment of the present invention is not limited to this. For example, when constructing a new building, it may be arranged on a structure surrounded by columns and beams. Further, the reinforcing frames 30, 40, 50 and 60 do not necessarily have to be exposed to the outside. For example, it may be covered with gypsum board or the like and embedded inside the wall body. As described above, the present invention can be carried out in various aspects.

12 pillars 14 beams (horizontal material)
24 Kamoi (horizontal material)
28 Shikii (horizontal material)
30 Reinforcement frame 32 Vertical frame 34 Horizontal frame 36 Low-strength part 40 Reinforcement frame 50 Reinforcement frame 56 Low-strength part 60 Reinforcement frame 66 Low-strength part H1 Structure surface H2 Structure surface

Claims (3)

With wooden pillars
The wooden horizontal members that were hung over the pillars,
A steel-framed reinforcing frame arranged on the structural surface of the frame formed of the column and the horizontal member and having a vertical frame along the column and a horizontal frame along the horizontal member.
A low-strength portion arranged at a joint portion between the vertical frame and the horizontal frame and having a yield strength smaller than that of the vertical frame and the horizontal frame.
Vibration control structure of a wooden frame equipped with. The vibration damping structure of the wooden frame according to claim 1, wherein the low-strength portion is made of low yield point steel and is welded to the vertical frame and the horizontal frame. The vibration damping structure of a wooden frame according to claim 1 or 2, wherein at least the vertical frame is fixed to the pillar, or at least the horizontal frame is fixed to the horizontal member.

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