JP7045780B2 - Reinforcement structure of wooden building - Google Patents

Description

The present invention relates to a reinforcing structure for providing seismic retrofitting and damping reinforcement to an existing wooden building.

In recent years, awareness of disaster prevention has increased with the occurrence of successive earthquakes, and the number of cases where wooden buildings have improved earthquake resistance and vibration control is increasing. Patent Document 1 describes a lower beam fixed to the upper surface of a concrete base, a pair of columns extending above the lower beam, an upper beam erected at the upper end of the columns, and an upper beam fixed to the lower surface of the upper beam. A hydraulic damper connected between the transmission member, the plate material for height adjustment fixed to the upper surface of the lower beam, the lower transmission member fixed to the upper end of the plate material, and the upper transmission member and the lower transmission member. The invention of the vibration damping device incorporated in the wall is disclosed.
However, when performing reinforcement work to give earthquake resistance and vibration control to existing wooden buildings, the walls, ceilings, wall materials and ceiling materials that make up the floor, floor materials are peeled off, columns, beams, foundations, etc. Since it is necessary to expose the frame of the building and the walls, ceiling, and floor will be re-covered after the reinforcement work is completed, there is a problem that the construction cost is high and the construction period is long.
In view of this problem, Patent Document 2 describes the studs between the left and right columns, the upper support material erected between the columns below the ceiling plate, and the columns and studs above the floor plate. Includes a lower support material erected between and, a pillar reinforcing material fixed along the pillar, a flat plate attached in the space surrounded by the upper support material, studs, the pillar reinforcing material, and the lower support material. The invention of a reinforcing structure that enables a seismic control device to be mounted in a frame of a building without peeling off the ceiling or floor by configuring a seismic control device composed of a seismic control member is disclosed.
Further, in Patent Document 3, an upper bracket is erected between the left and right pillars below the ceiling height, and a lower bracket is erected above the floor surface via a fixing plate along the pillars. The invention of a reinforcing structure incorporating a vibration control device that supports a hydraulic damper via an upper transmission member and a lower transmission member is disclosed between the upper bracket and the lower bracket.

Japanese Patent No. 5153440 Japanese Unexamined Patent Publication No. 2014-237946 Japanese Patent No. 4041743

In the reinforcing structure of Patent Documents 2 and 3, a column reinforcing material or a fixing plate is provided on the side surface of a pair of columns, and an upper support material or an upper bracket is erected inside the column reinforcing material or the upper bracket. Since the structure is such that the transmission member is fixed, it takes time and effort to attach the column reinforcing material and the fixing plate to the column, which leads to an increase in man-hours. In addition, since the upper support material and the upper bracket are fixed only to the column via the column reinforcing material, etc., the bending deformation of the column when a displacement is input to the beam cannot be suppressed, and the column may bend and break. There is a risk that displacement cannot be efficiently input to vibration control members such as dampers.

Therefore, the present invention is a wooden building that can be constructed by reducing the number of man-hours without peeling off the ceiling or floor, and can also suppress bending deformation of columns to secure necessary seismic control and seismic resistance. It is intended to provide a reinforced structure.

In order to achieve the above object, the invention according to claim 1 has a pair of pillars, an upper horizontal member horizontally arranged on the upper side of the pillars, and horizontally arranged on the lower side of the pillars. It is a structure that reinforces the frame of a wooden building composed of lower horizontal members.
An additional horizontal member horizontally erected between a pair of columns on the upper side of the frame, and an additional horizontal member placed in the frame below the additional horizontal member and fixed to at least one of the additional horizontal member and the pair of columns. A rotation allowance portion provided at the joint between the additional horizontal member or the additional horizontal member and the column, and allowing the additional horizontal member to rotate in a direction parallel to the surface of the frame. It is characterized by including.
According to a second aspect of the present invention, in the configuration of the first aspect, the rotation allowance portion is partially formed between at least one facing surface of the additional cross member and the pair of columns, and is formed in the out-of-plane direction of the frame. It is characterized by being a continuous gap.
According to the third aspect of the present invention, in the configuration of the second aspect, the additional horizontal member is fixed by the bracket fitting in a state where the end portion of the additional horizontal member is partially in contact with the pillar, and the additional horizontal member is fixed at the end portion. It is characterized in that a gap is formed in a portion that does not come into contact with the pillar.
According to a fourth aspect of the present invention, in the configuration of the first aspect, the rotation allowance portion is formed by interposing a cushioning material between at least one facing surface of the additional horizontal member and the pair of columns. It is a feature.
According to a fifth aspect of the present invention, in the configuration of the first aspect, the rotation permitting portion connects the divided members of the additional horizontal members divided in the longitudinal direction in the longitudinal direction with a gap interposed therebetween. It is characterized by being formed by.
The invention according to claim 6 is characterized in that, in the configuration of claim 5, a cushioning material is interposed in the gap.
The invention according to claim 7 is characterized in that, in the configuration of claim 4 or 6, the cushioning material is interposed in a precompressed state.
In the invention according to claim 8, in any of the configurations of claims 1 to 7, the additional horizontal member and the pair of columns are fixed to each other via the bracket fittings, and the rotation allowance portion is the bracket fittings. It is characterized in that it is a slit formed so as to extend along at least one longitudinal direction of the additional cross member and the pair of columns.
The invention according to claim 9 is the configuration according to any one of claims 1 to 8, wherein the reinforcing body is a brace erected diagonally on one side in a frame below the additional cross member, and is allowed to rotate. The portion is characterized in that the additional cross member is provided on the end side where the brace is not erected.

According to the invention according to claim 1, an additional horizontal member or an additional horizontal member horizontally erected between a pair of pillars on the upper side of the frame is provided at a joint portion between the additional horizontal member and the pillar, and the surface of the frame. By providing a rotation allowance that allows the additional horizontal members to rotate in parallel directions, it is possible to reduce the number of steps without peeling off the ceiling or floor, and it is necessary to suppress bending deformation of columns. It is also possible to ensure good vibration control and earthquake resistance. In particular, by installing the rotation allowance portion, it is possible to effectively suppress the bending moment and the generated load applied to the column due to the rotation of the additional cross member at the time of vibration. Therefore, it is possible to easily apply seismic retrofitting and seismic retrofitting to existing wooden buildings.
According to the second aspect of the present invention, in addition to the above effects, the rotation allowance portion is partially formed between at least one facing surface of the additional cross member and the pair of columns, and is in the out-of-plane direction of the frame. Since the gap is continuous with the column, the additional horizontal member can be joined to the column in a state close to the pin joint to easily form the rotation allowance portion.
According to the third aspect of the present invention, in addition to the above effect, the additional horizontal member is fixed by the bracket fitting in a state where the end portion of the additional horizontal member is partially in contact with the pillar, and the end portion thereof. Since a gap is formed in the non-contact portion with the pillar in the above, the joining having the gap can be easily performed by using the bracket metal fittings.
According to the invention of claim 4, in addition to the above-mentioned effect, the rotation allowance portion is formed by interposing a cushioning material between at least one facing surface of the additional horizontal member and the pair of columns. The clearance between the additional cross member and the column makes it possible to obtain a state close to pin joining. In addition, the cushioning material eliminates the possibility of foreign matter entering between the facing surfaces.
According to the fifth aspect of the present invention, in addition to the above effect, the rotation allowance portion is connected in the longitudinal direction with the divided members of the additional horizontal members divided in the longitudinal direction interposed therebetween. Since it is formed by this, the additional cross member itself can be made into a structure similar to a pin joint, and the bending moment and the generated load applied to the column can be suppressed.
According to the invention of claim 6, in addition to the above-mentioned effect, the cushioning material is interposed in the gap, so that there is no possibility that foreign matter enters between the divided members.
According to the invention of claim 7, in addition to the above-mentioned effect, the cushioning material is interposed in the precompressed state, so that the possibility of falling off is reduced.
According to the invention according to claim 8, in addition to the above effect, the additional horizontal member and the pair of pillars are fixed to each other via the bracket metal fittings, and the rotation allowance portion is provided with the additional horizontal member in the bracket metal fittings. By making the slits formed so as to extend along at least one of the longitudinal directions of the pair of columns, the joints between the additional horizontal members and the columns are brought into a state close to pin joining by using the bracket metal fittings. Can be.
According to the invention of claim 9, in addition to the above effect, the reinforcing body is a brace erected diagonally on one side in the frame below the additional horizontal member, and the rotation allowance portion is added laterally. By providing the brace in the frame material on the end side where the brace is not installed, it is possible to reliably allow the rotation of the additional cross frame material at the time of vibration.

In the explanatory view of the frame for seismic control reinforcement, (A) shows the front surface and (B) shows the right side surface (the pillar on the right side is omitted). In the explanatory view of the frame from which the wall material is partially removed, (A) shows the front surface, and (B) shows the right side surface (the pillar on the right side is omitted). In the explanatory view of the frame to which the upper reinforcing material is attached, in the explanatory view of the frame, (A) shows the front surface, and (B) shows the right side surface (the pillar on the right side is omitted). (A) is an enlarged view of the left side joint to which the upper reinforcing material is attached, (B) is a plan view of the upper reinforcing material, and (C) is a front view. In the explanatory view of the frame with the additional horizontal members attached to the top and bottom, (A) shows the front surface, and (B) shows the right side surface (the pillar on the right side is omitted). It is explanatory drawing which enlarges and shows the attachment part of the additional horizontal member on the upper side. In the explanatory view of the frame to which the vibration control damper is fixed, (A) shows the front surface and (B) shows the right side surface (the pillar on the right side is omitted). In the explanatory view of the frame in which the removed portion of the wall material is again closed with the wall material, (A) shows the front surface and (B) shows the right side surface (the pillar on the right side is omitted). FIGS. (A) and (B) are explanatory views showing an example of changing the shape of the end portion of the additional horizontal member. It is explanatory drawing which shows the modification example which used the cushioning material at both ends of the additional horizontal material. It is explanatory drawing which shows the modification example which used the cushioning material at one end of the additional horizontal material. (A) is an explanatory diagram showing a modified example in which an additional horizontal member is divided to form a gap, and (B) is an explanatory diagram showing a modified example in which a cushioning material is interposed between the divided members. (A) is an explanatory diagram of a modification example of the bracket metal fitting, and (B) is an explanatory diagram of a mounting portion of an additional horizontal member using the bracket metal fitting. (A) is an explanatory diagram of a modification example of the bracket metal fitting, and (B) is an explanatory diagram of a mounting portion of an additional horizontal member using the bracket metal fitting. (A) is an explanatory diagram of a modification example of the bracket metal fitting, and (B) is an explanatory diagram of a mounting portion of an additional horizontal member using the bracket metal fitting.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B are explanatory views of a frame 1 constituting a wall, FIG. 1A is a front view, FIG. 1B is a right side view, and the pillar on the right side is omitted. The frame 1 includes a beam 2 as an upper horizontal member, a base 3 as a lower horizontal member, and a pair of columns 4 and 4 erected vertically between the beam 2 and the base 3. .. Reference numeral 5 is a wall material that covers the front and back of the frame 1. The dotted line L1 indicates a ceiling surface formed by a ceiling material (not shown), and the dotted line L2 indicates a floor surface formed by a floor material (not shown).

Here, a procedure for applying vibration control reinforcement to the frame 1 will be described.
First, as shown in FIG. 2, in the wall material 5 on the front side of the frame 1, the intermediate portion 5a between the ceiling surface L1 and the floor surface L2 and between the left and right pillars 4 and 4 is removed to remove the frame. 1 The inside is exposed to the front side.

Next, as shown in FIG. 3, the upper reinforcing member 6 is attached between the beam 2 and the columns 4 and 4 slightly below the ceiling surface L1. As shown in FIG. 4, the upper reinforcing member 6 is folded back at right angles to the left and right longitudinal sides of the strip-shaped metal plate to form folded portions 7 and 7 over the entire length of the longitudinal side, and both ends in the longitudinal direction. Is an oblique member formed by diagonally bending toward the folded-back portion 7 side to form a linear main body portion 8 and mounting portions 9 and 9 at both ends thereof. Reinforcing ribs 10 are fixed to the bent portions of the mounting portions 9. However, the main body portion is not limited to the U-shaped cross section as shown in FIG. 4, and the cross section may be curved or the like. It does not have to be linear.
By fixing one of the mounting portions 9 to the lower surface of the beam 2 and the other to the inner surface of the pillar 4 with fixtures 11 such as nails and wood screws, the mounting portion 9 is mounted between the beam 2 and the pillar 4 in a cane shape. Will be. The upper reinforcing member 6 is symmetrically mounted in pairs at a position where the lower mounting portion 9 projects downward from the ceiling surface L1.

Next, as shown in FIG. 5, additional horizontal members 12 are horizontally erected between the columns 4 and 4 on the lower side of the ceiling surface L1 and the upper side of the floor surface L2. As shown in FIG. 6, the additional horizontal member 12 is an inclined surface 13 in which both left and right end surfaces are inclined diagonally so as to gradually project outward from one end in the lateral direction toward the other end. Therefore, the dimensions in the longitudinal direction change in the lateral direction. Hereinafter, when distinguishing the upper and lower additional horizontal members 12, the upper side (ceiling surface L1 side) additional horizontal member 12A and the lower side (floor surface L2 side) additional horizontal member 12B will be described. ..

The additional horizontal member 12A erected on the lower side of the ceiling surface L1 has the upper surface facing the side where the longitudinal dimension becomes longer due to the inclined surfaces 13 and 13 at both ends, and the upper surfaces are the mounting portions of the upper reinforcing members 6 and 6 on the left and right. At a height lower than 9, the inclined surfaces 13 and 13 are arranged between the columns 4 and 4 in a state where the lower ends of the inclined surfaces 13 and 13 are in contact with the side surfaces of the columns 4 and 4, respectively. Then, at the left end of the additional horizontal member 12A, an L-shaped bracket fitting 14 is applied across the side surface of the pillar 4 and the lower surface of the additional horizontal member 12A, and is fixed by the fixture 11. On the other hand, at the right end portion, the rectangular plate portion 16 parallel to the frame surface of the frame 1, the horizontal plate portion 17 bent toward the front side at the short side of the rectangular plate portion 16, and the length of the rectangular plate portion 16. The horizontal plate portion 17 is additionally fixed to the lower surface of the horizontal member 12A and the vertical plate portion 18 is fixed to the side surface of the pillar 4 by using the bracket metal fitting 15 composed of the vertical plate portion 18 which is bent toward the front side at the side. Fix with tool 11. As a result, at both the left and right ends of the additional horizontal member 12A, there are gaps 19 as rotation allowances that are continuous in the frame 1 and in the out-of-plane direction of the frame 1 and become wider as they go upward between the columns 4 and 4. 19 is formed.

On the other hand, the additional horizontal member 12B arranged above the floor surface L2 has an inclined surface 13 at a height such that the side having a long longitudinal dimension is facing up and the whole is above the floor surface L2. , 13 are arranged between the pillars 4 and 4 in a state where the upper ends of the pillars 4 and 13 are in contact with the side surfaces of the pillars 4 and 4, respectively. Then, the left and right ends are joined by the bracket fitting 14 at the right end and by the bracket fitting 15 at the left end so that the left and right ends are reversed from the upper additional horizontal member 12A. As a result, gaps 19 and 19 are formed on the left and right ends of the additional horizontal member 12B, which are continuous in the frame 1 and in the out-of-plane direction of the frame 1 and widen with the columns 4 and 4 downward. ..
At this time, the lower additional horizontal member 12B may be erected at a height such that only the upper surface is above the floor surface L2.

Next, as shown in FIG. 7, a vibration control damper 30 as a reinforcing body is installed in the inner frame 20 composed of the left and right columns 4 and 4 and the upper and lower additional horizontal members 12A and 12B. The vibration damping damper 30 is a viscoelastic damper in which a viscoelastic body (not shown) is bonded between the outer cylinder 31 and the inner cylinder 32 which are coaxially overlapped, and the outer end of the outer cylinder 31 and the outer end of the inner cylinder 32. The extension timbers 33 and 33 fixed on the extension lines to the portions are attached to the rectangular plate portion 16 of the bracket fitting 15 located at the joint between the pillar 4 and the additional horizontal member 12A, and the pillar 4 and the additional horizontal member are attached to the rectangular plate portion 16. By fixing each of the rectangular plate portions 16 of the bracket metal fittings 15 located at the joint portion with the 12B with the fixtures 11, they are erected in a brace shape in the inner frame 20.

When installing the vibration control damper 30, after fixing the additional horizontal members 12A and 12B with the bracket metal fittings 14 and the bracket metal fittings 15, the extension timbers 33 and 33 of the vibration control damper 30 are inserted into the back side of the rectangular plate portion 16. When joining the additional horizontal members 12A and 12B, the vibration damping damper 30 is first placed in the inner frame 20 before the bracket metal fittings 15 and 15 are attached, and then each joint is used. Work of arranging bracket metal fittings 15 and 15 in the portion and fixing the bracket metal fitting 15 (work of fixing the rectangular plate portion 16 to the extension timber 33 and work of fixing the horizontal plate portion 17 to the additional horizontal members 12A and 12B). And the work of fixing the vertical plate portion 18 to the pillar 4) may be performed at the end.
Then, as shown in FIG. 8, if the space between the ceiling surface L1 and the floor surface L2 and the space between the left and right pillars 4 and 4 are closed again with the wall material 5b, the construction of the seismic control reinforcement is completed.

Therefore, in this frame 1, when the frame 1 is vibrated in the horizontal direction due to an earthquake or the like and deformed to the left or right, compressive force and tensile force are alternately input to the vibration control damper 30 in the inner frame 20, and the outer cylinder 31 and the inner cylinder 31 are inner. The viscoelastic body adhered to the cylinder 32 is sheared and deformed to attenuate the vibration energy.
At this time, in the frame 1, since the upper reinforcing member 6 is provided between the beam 2 and the additional horizontal member 12A, the bending deformation of the columns 4 and 4 is suppressed, the bending fracture is less likely to occur, and the damping is suppressed. Axial force to the seismic damper 30 is efficiently input. In particular, since both ends of the additional horizontal members 12A and 12B form a gap 19 between the inclined surfaces 13 and 13 and the column 4 and are in a state close to pin joining, bending moments and generations applied to the column 4 are generated. The load is suppressed by rotating both ends of the additional cross members 12A and 12B in a direction parallel to the surface of the frame 1, and the risk of damage to the pillar 4 is reduced.

As described above, according to the reinforcing structure of the wooden building of the above-mentioned form, the additional horizontal members 12A and 12B and the additional horizontal members 12A that are horizontally erected between the pair of columns 4 and 4 at the top and bottom of the frame 1. , 12B, the vibration control damper 30 arranged on the inner frame 20 and fixed to the additional horizontal members 12A and 12B and the pair of pillars 4 and 4, and the combination of the additional horizontal members 12A and 12B and the pillar 4. By including a rotation allowance portion (gap 19) provided in the mouth portion and allowing the additional horizontal members 12A and 12B to rotate in a direction parallel to the surface of the frame 1, the ceiling and the floor are not peeled off. It is possible to reduce the number of steps and perform construction, and it is also possible to suppress bending deformation of columns 4 and 4 and secure necessary seismic control and seismic resistance. In particular, by installing the rotation allowable portion (gap 19), it is possible to effectively suppress the bending moment and the generated load applied to the columns 4 and 4 due to the rotation of the additional horizontal members 12A and 12B at the time of vibration. Therefore, it is possible to easily apply seismic retrofitting and seismic retrofitting to existing wooden buildings.

In particular, here, the rotation allowance portion is partially formed between the facing surfaces of the additional horizontal members 12A and 12B and the columns 4 and 4, and the gaps 19 and 19 are continuous in the out-of-plane direction of the frame 1. The additional horizontal members 12A and 12B can be joined to the column 4 in a state close to pin joining to easily form a rotation allowance portion.
Further, the additional horizontal members 12A and 12B are fixed by the bracket fitting 14 in a state where the ends of the additional horizontal members 12A and 12B are partially in contact with the pillar 4, and the ends thereof are not in contact with the pillar 4. Since the gap 19 is formed in the portion, the joining having the gap 19 can be easily performed by using the bracket metal fitting 14.
Further, the reinforcing body is a brace (vibration control damper 30) erected on one diagonal line in the inner frame 20 between the additional horizontal members 12A and 12B, and the rotation allowable portion is the additional horizontal members 12A and 12B. Since the brace is provided on the end side where the brace is not erected, the rotation of the additional horizontal members 12A and 12B at the time of vibration can be reliably allowed.

In the above embodiment, the entire left and right end faces of the additional horizontal member are used as inclined surfaces to form a gap between the additional horizontal members and the pillars. A flat surface 21 parallel to the side surface of the pillar 4 may be provided without inclining the lower portion of the end surface of the horizontal member 12A (the upper portion in the additional horizontal member 12B), and the upper portion may be used as the inclined surface 13 to provide a gap 19. .. The ratio between the flat surface 21 and the inclined surface 13 can be appropriately changed.
Further, even if the entire end surface is an inclined surface, as shown in FIG. 9B, inclined surfaces 13a and 13b that are inclined upside down are formed in the upper portion and the lower portion to form a chevron-shaped end portion. , Only the central portion in the vertical direction of the end portion may be fixed in contact with the side surface of the pillar 4, and gaps 19 and 19 may be provided above and below. It may be an arcuate curved surface instead of an inclined surface.
Further, in the above embodiment, the gaps 19 and 19 are formed at the left and right ends of the additional horizontal member 12, but the inclined surface 13 and the like are not provided at the end on the bracket fitting 15 side to which the vibration damping damper 30 is joined. It is also possible to form an inclined surface 13 or the like only on the opposite end portion to provide a gap 19.

On the other hand, the rotation allowable portion is not limited to the gap, and as shown in FIG. 10, for example, the dimension in the longitudinal direction of the additional horizontal member 12 is made shorter than the internal dimension of the columns 4 and 4, and the additional horizontal member 12 is used. It is also possible to form a rotation allowance portion by interposing a cushioning material 22 such as rubber or sponge in a precompressed state between both ends of the column and the facing surfaces of the columns 4 and 4.
In this way, even if the rotation allowance portion is formed by interposing the cushioning material 22 between the facing surfaces of the additional horizontal member 12 and the columns 4 and 4, the additional horizontal member 12 and the columns 4 and 4 can be formed. A state close to pin joining can be obtained by the clearance between them. Further, the cushioning material 22 eliminates the possibility of foreign matter entering between the facing surfaces. In particular, if the cushioning material 22 is interposed in a precompressed state, the risk of falling off is reduced.
Further, as shown in FIG. 11, the cushioning material 22 may be provided only at the end portion on the side opposite to the end portion on the bracket metal fitting 15 side to form the rotation allowable portion. In this modification, the bracket metal fitting 14a is connected to the side view U-shaped upper metal fitting 23 that covers the end portion of the additional horizontal member 12, and the horizontal portion 25 at the upper end is connected to the lower surface of the upper metal fitting 23 to be vertical at the lower end. The portion 26 is composed of an inverted L-shaped lower metal fitting 24 attached to the side surface of the pillar 4.

In the above-mentioned form and the modified example, the rotation allowance portion is formed at the joint portion between the additional horizontal member and the pillar. For example, as shown in FIG. 12 (A), the additional horizontal member 12 is provided in the central portion. Assuming that it is composed of two dividing members 40, 40 which are divided by and divided in the longitudinal direction, the ends of each dividing member 40 on the pillar 4 side are fixed to the pillars 4 and 4 by the bracket metal fittings 14 and the bracket metal fittings 15, respectively. Alternatively, a gap 41 serving as a rotation allowable portion may be formed between the facing surfaces of the divided members 40 and 40. In this case, the ends of the split members 40, 40 facing each other are vertically arranged across the split members 40, 40, and both ends are fixed to the split member 40 by the fixture 11. , 42 are joined. Therefore, the gap 41 is continuous in the out-of-plane direction of the frame 1.

In this case, if a bending moment or stress concentration is generated in the column 4 when the column 4 is vibrated, the connecting plates 42, 42 joining the dividing members 40, 40 are plastically deformed, and the dividing members 40, 40 are the surfaces of the frame 1. Allows to rotate in a direction parallel to. As a result, bending moment and stress concentration are suppressed.
In this way, if the rotation allowance portion is formed by connecting the divided members 40, 40 of the additional horizontal member 12 divided in the longitudinal direction in the longitudinal direction with the gap 41 interposed therebetween, the additional lateral member is formed. The frame member 12 itself can have a structure similar to that of a pin joint, and the bending moment and the generated load applied to the column 4 can be suppressed.
The shapes of the ends of the divided members 40 and 40 are not limited to the above-mentioned shapes, and can be appropriately changed, for example, to have a chevron shape shown in FIG. 9B, a semicircular shape, or the like. Further, as shown in FIG. 12B, the cushioning material 43 may be filled between the facing surfaces of the ends of the dividing members 40, 40 in a precompressed state.

Further, the rotation allowance portion is not limited to the case where it is provided at the joint portion between the additional horizontal member and the pillar or the additional horizontal member itself, but can also be provided at the bracket metal fitting.
FIG. 13A shows a bracket metal fitting 50 provided with a rotation allowance portion, and the bracket metal fitting 50 has a first rectangular plate 51 having a horizontal plate portion 52 bent on the upper short side and a right side. It is composed of a second rectangular plate 53 in which a vertical plate portion 54 is bent and formed on a long side. The first rectangular plate 51 has a longer length in the longitudinal direction than the second rectangular plate 53, and two elliptical plates extending in the left-right direction in parallel with the horizontal plate portion 52 are formed below the horizontal plate portion 52. The slits 55 and 55 are arranged side by side in a straight line in the left-right direction.

As shown in FIG. 13B, in the bracket metal fitting 50, the horizontal plate portion 52 is attached to the additional horizontal member 12 in a state where the first rectangular plate 51 and the second rectangular plate 53 are overlapped with the lower ends aligned with each other. , The vertical plate portion 54 is fixed to the pillar 4, respectively. Both rectangular plates 51 and 53 are fixed to, for example, the extension wood 33 of the vibration control damper 30 with a fixing tool 11 penetrating them. In this state, the second rectangular plate 53 does not overlap the slits 55 and 55 that serve as rotation allowances.
Therefore, when a bending moment or stress concentration is generated in the column 4 when the column 4 is vibrated to the frame 1, the formed portions of the slits 55 and 55 in the first rectangular plate 51 of the bracket metal fitting 50 are plastically deformed, and the additional cross member 12 is attached to the frame. Allows rotation in a direction parallel to the plane of 1.

The slits 55 and 55 are not limited to the case where they are formed along the additional horizontal member 12, and as shown in FIG. 14, the slits 55 and 55 may be provided in parallel with the vertical plate portion 54 near the long side of the second rectangular plate 53. Alternatively, as shown in FIG. 15, it may be provided on both the first and second rectangular plates 51 and 53. The number can be increased or decreased. Further, the bracket metal fitting 50 itself is not limited to the structure formed from two rectangular plates, and may be formed from one metal plate.
As described above, if the rotation allowance portion is a slit 55 formed in the bracket fitting 50 so as to extend along at least one longitudinal direction of the additional cross member 12 and the pillar 4, the bracket fitting 50 is used. The joint portion between the additional horizontal member 12 and the pillar 4 can be brought into a state close to a pin joint. Therefore, the bending moment and stress concentration are suppressed, and the risk of damage to the column 4 is reduced.
Each reinforcing structure in which the rotation allowance portion is provided in the bracket metal fitting can also be used in combination with the embodiment in which the rotation allowance portion such as a gap is provided in the additional horizontal member described above.

In the above embodiment and the modified example, the additional horizontal member is also provided on the lower side (floor surface side), but this may be omitted and the additional horizontal member may be provided only on the upper side (ceiling surface side). .. The upper reinforcing material can also be omitted.
Further, as a reinforcing body, a vibration control damper composed of a viscoelastic damper and an extended wood is erected diagonally, but the present invention is not limited to this, and a laminated type composed of a plurality of steel plates and a viscoelastic body bonded between them. It can be changed as appropriate, such as using a vibration control damper or a K-type vibration control damper. Furthermore, a hydraulic damper or the like can be adopted instead of a viscoelastic damper, and a simple wooden or metal brace can be adopted instead of a damper. In this case, it is desirable that the brace is installed diagonally on one side in the lower frame of the additional cross member, and the rotation allowance portion is provided on the end side of the additional cross member where the brace is not installed. By providing the rotation allowance portion on the end side where the brace of the additional horizontal member is not erected in this way, it is possible to reliably allow the rotation of the additional horizontal member at the time of vibration.

1 ... Frame, 2 ... Beam, 3 ... Base, 4 ... Pillar, 5 ... Wall material, 6 ... Top reinforcement, 11 ... Fixture, 12 (12A, 12B) ... Additional horizontal Lumber, 13,13a ... Inclined surface, 14 ... Bracket metal fittings, 15,50 ... Bracket metal fittings, 19,41 ... Gap, 20 ... Inner frame, 22,43 ... Cushioning material, 30 ... Seismic control Damper, 31 ... outer cylinder, 32 ... inner cylinder, 33 ... extension wood, 40 ... split member, 51 ... first rectangular plate, 53 ... second rectangular plate, 55 ... slit, L1 ... Ceiling surface, L2 ... floor surface.

Claims (9)

Reinforces the frame of a wooden building composed of a pair of pillars, an upper horizontal member horizontally arranged on the upper side of the pillar, and a lower horizontal member horizontally arranged on the lower side of the pillar. It is a structure that
An additional horizontal member horizontally erected between the pair of columns on the upper side of the frame, and
A reinforcing body arranged in the frame below the additional cross member and fixed to at least one of the additional cross member and the pair of columns.
A rotation allowance portion provided at the joint portion between the additional horizontal member or the additional horizontal member and the pillar and allowing the additional horizontal member to rotate in a direction parallel to the surface of the frame.
Reinforced structure of a wooden building characterized by containing. The claim is characterized in that the rotation allowance portion is partially formed between at least one facing surface of the additional horizontal member and the pair of columns, and is a continuous gap in the out-of-plane direction of the frame. Reinforcing structure of the wooden building described in 1. The additional horizontal member is fixed by the bracket fitting in a state where the end portion of the additional horizontal member is partially in contact with the pillar, and the gap is formed in the non-contact portion of the end portion with the pillar. The reinforcing structure of the wooden building according to claim 2, characterized in that. The wooden building according to claim 1, wherein the rotation allowance portion is formed by interposing a cushioning material between at least one facing surface of the additional horizontal member and the pair of columns. Reinforced structure. The first aspect of the present invention is characterized in that the rotation allowance portion is formed by connecting the divided members of the additional horizontal member divided in the longitudinal direction in the longitudinal direction with a gap interposed therebetween. Reinforcing structure of wooden buildings. The reinforcing structure for a wooden building according to claim 5, wherein a cushioning material is interposed in the gap. The reinforcing structure of a wooden building according to claim 4 or 6, wherein the cushioning material is interposed in a precompressed state. The additional horizontal member and the pair of columns are fixed to each other via bracket fittings, and the rotation allowance portion is the longitudinal length of at least one of the additional horizontal member and the pair of columns in the bracket metal fittings. The reinforcing structure for a wooden building according to any one of claims 1 to 7, wherein the slit is formed so as to extend along a direction. The reinforcing body is a brace mounted diagonally on one side in the frame below the additional cross member, and the rotation allowance portion is an end side of the additional cross member on which the brace is not erected. The reinforcing structure of a wooden building according to any one of claims 1 to 8, wherein the structure is provided in the above.

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