JP2013028944A - Load-bearing wall and connection fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load-bearing wall in which horizontal displacement is allowed while maintaining a sufficient strength until achieving ultimate destruction, and a connection fitting used for the load-bearing wall.SOLUTION: Two braces 6, 7 are disposed in a frame body formed from a sill 2, a beam 5 and two posts 3, 4 which are erected on the sill 2 and support the beam. One end of each of the two braces is connected through a connection fitting 20 to an intermediate part of the first post 3. The two braces are connected with the second post 4 obliquely upward and obliquely downward from that connected part. The connection fitting is deformed to allow one end of each of the two braces and the first post to which that brace is connected, to be displaced relatively in an axial line direction of the first post. The connection fitting is formed by bending a steel plate and includes, between a post fixed part 21 fixed to the post and a brace fixed part 24 fixed to the brace, a folded part 22 which is folded and confronted with the post fixed part.

Description

  The present invention relates to a bearing wall that is provided in a wooden building and resists a horizontal force during an earthquake or the like, and a joining metal fitting used in the bearing wall.

  In the wooden structure of a frame structure, a load bearing wall is provided to resist horizontal force due to an earthquake or the like. The bearing wall is a structure in which a face material such as a structural plywood is fixed to a rectangular frame made of two pillars and two horizontal members arranged on the lower side and upper side of the pillars, and a brace in the frame. The one in which is arranged is widely used. The bearing wall using braces joins one end of the braces to the joint between the upper horizontal member and one column, and joins the other end to the joint between the lower horizontal member and the other column. Things have become commonplace. In addition, a bearing wall having a structure in which two braces are arranged in one frame, and the two braces and a column in which these braces are joined to an intermediate portion is formed in a K-shape is disclosed in, for example, Patent Document 1 or Patent Document 2.

  In these bearing walls, the first brace of the two braces has one end fixed to the joint between the upper horizontal member and one column, and the other end to the middle in the vertical direction of the other column. Fix it. The second bracing, which is the other bracing, is that one end is fixed to the joint between the lower horizontal member and one column, and the other end is connected to the middle portion of the other column. Connect and fix. Fixing brackets are used for the part where each brace is fixed at the corner of the column and the horizontal member and the part where the two braces are fixed in the middle of the column, and the tensile force and compression acting on the brace Force is transmitted to the pillar or horizontal member.

  In the bearing wall where the two braces and columns are arranged in a K shape as described above, the angle between the vertical direction and the brace axis increases, and the braces effectively resist horizontal forces. Become.

JP 2000-104342 A JP 2010-53661 A

  When a horizontal force due to an earthquake or the like is applied, a frame structure constructed using columns and horizontal members is deformed in the horizontal direction. That is, the horizontal force inclines the column, and acts to horizontally displace horizontal members such as beams and trunk differences supported on the column. The load bearing wall is constructed so as to have sufficient strength against such a horizontal force. Further, it is desirable that the bearing wall allows a large displacement while maintaining a sufficient strength until the ultimate destruction. The load bearing wall allows a large displacement until the ultimate failure, so that the structure becomes strong and it is possible to avoid a sudden failure when a horizontal force repeatedly acts as in an earthquake.

  In a bearing wall in a wooden frame structure, where the bracing and columns are arranged in a K shape as described above, the bracing with the tensile force acting on the bracing is assumed to be the ultimate failure. It is conceivable to be separated from the joint corner between the column and the column, or in a state where the end of the brace joined to the middle part of the column is displaced in the vertical direction with respect to the column and separated from the column. A structure that allows a large relative displacement in the horizontal direction while maintaining sufficient strength until reaching such a state is desired.

  The present invention has been made in view of the circumstances as described above, and the object thereof is a bearing wall in which braces and columns are arranged in a K-shape, which is sufficient to reach final destruction. It is an object to provide a bearing wall that allows a large horizontal displacement while maintaining strength and a joint fitting used in the bearing wall.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a wooden lower horizontal member that is supported substantially horizontally, and a wooden first horizontal member that is erected on the lower horizontal member at an interval. A pillar and a second pillar, a wooden upper horizontal member that is supported substantially horizontally on these pillars, and one end connected to an intermediate portion between the upper end and the lower end of the first pillar via a joint fitting The first brace joined to the second pillar at a position higher than the joining position by the joint fitting, and one end joined to the intermediate portion of the first pillar via the joint fitting. A second brace joined to the second column at a position lower than the joining position by the joining fitting, and the joining fitting is one end of the two bracings by deformation of the joining fitting. And the first column to which the braces are joined are relatively changed in the axial direction of the first column. There is provided a bearing wall, characterized in that in which allows to.

  In this bearing wall, when a horizontal force acts on the horizontal member due to an earthquake or the like, a tensile force acts on one of the two braces, and a compressive force acts on the other brace. And in the part where these braces are joined to the middle part of the column, a force is exerted between the ends of the braces and the column in a vertical direction. For this force, the joint fitting that joins the end of the brace and the column allows relative displacement between the brace and the column due to deformation of the joint fitting itself, and the joint fitting is made of metal. Therefore, even if it is deformed, it does not immediately lose the strength, that is, the strength that maintains the joining state between the column and the brace. Therefore, the frame formed of the pillar and the horizontal member has a proof strength in a state of being deformed by a horizontal force and has a tenacious structure. In addition, an effect of absorbing energy by absorbing plasticity due to plastic deformation in the joint metal and attenuating vibration by absorbing vibration energy when horizontal force repeatedly acts during an earthquake or the like can be obtained.

  The invention according to claim 2 is the load bearing wall according to claim 1, wherein the joint metal fitting is made of a continuous plate-shaped member, and is fixed to a column fixing portion that contacts and is fixed to a side surface of the column. A folding portion that is continuous with the fixing portion and is bent so as to be folded by a folding line in the vertical direction, and is opposed to the column fixing portion; continuous with the column fixing portion via the folding portion; and substantially perpendicular to the column fixing portion And a brace fixing portion fixed to the side of the brace.

  In this bearing wall, the joint fitting that joins the two braces to the middle part of the column allows relative displacement between the column fixing part fixed to the column and the bracing fixing part fixed to the brace. That is, the folded portion between the column fixing portion and the brace fixing portion and the portion adjacent to the folded portion are deformed to allow the deformation. Even when such deformation occurs, the state of maintaining the function of joining the braces and the columns is maintained. Therefore, it is possible to obtain a bearing wall having a tenacious structure by using a simple-structured joint fitting made of a continuous plate-like member, and abrupt destruction of the bearing wall is avoided.

  The invention according to claim 3 is the load bearing wall according to claim 2, wherein the bracing is fixed to the bracing fixing portion in a state in which an end surface is in contact with or in close proximity to the folded portion.

  In this bearing wall, the bent portion is inserted between the end face of the bracing and the side surface of the column to which the column fixing portion is attached, and displacement of the bent portion in the direction perpendicular to the end face of the bracing is restrained. Therefore, when a relative displacement occurs between the column fixing portion and the bracing fixing portion, a resistance force against the relative displacement is largely maintained, and a bearing wall having sufficient strength against a horizontal force can be obtained.

  The invention according to claim 4 is composed of a continuous metal plate-like member, a column fixing portion fixed in contact with a side surface in an intermediate portion from the upper end to the lower end of the column, continuous with the column fixing portion, and vertically A folded portion that is bent so as to be folded by a fold line in a direction and is opposed to the column fixing portion, is continuous with the column fixing portion via the folding portion, is substantially perpendicular to the column fixing portion, and obliquely upward and There is provided a joining bracket characterized by having a brace fixing portion fixed to a side surface of two braces that are installed obliquely downward.

  By using this joining metal fitting, it is possible to join the two braces to the middle part of the column, and to construct the bearing wall by laying these braces diagonally upward and diagonally downward. When a force that causes relative displacement in the vertical direction is generated at the joint between the brace and the column, the joint fitting is deformed, and the relative position is maintained while maintaining the state where the brace and the column are joined. General displacement can be tolerated. In other words, the deformation of the above-mentioned joining bracket is caused by the fact that the column fixing part fixed to the column and the brace fixing part fixed to the brace are continuous via the folded part, so that the folded part and the part close to the folded part The column fixing portion is firmly fixed to the column and the bracing fixing portion is firmly fixed to the bracing.

  According to a fifth aspect of the present invention, in the joint fitting according to the fourth aspect of the present invention, the second metal is bent by a second fold line that is continuous with the folded portion and is set substantially parallel to the fold line across the folded portion. A second folded portion that is bent and faces the folded portion is provided, and the brace fixing portion is continuous with the column fixing portion via the second folded portion and the folded portion.

  In this joint fitting, when a relative displacement occurs between the column fixing portion and the brace fixing portion, the folded portion, the second folded portion, and the periphery thereof are deformed. Therefore, a large relative displacement is allowed between the column fixing portion and the brace fixing portion without breaking the joining bracket, and the column fixing portion is fixed to the column, and the bracing fixing portion is fixed to the two braces. Is maintained.

  The invention according to claim 6 is the joining bracket according to claim 4 or claim 5, wherein the column fixing portion is provided with a plurality of small holes, and a tip portion inserted into the small holes is driven into the column or It is fixed to the pillar by a fixing member that can be screwed, and an opening is provided at a position facing the small portion of the folded portion or the folded portion and the second folded portion, Has a size that allows the tip of the fixing member to be inserted into the small hole and driven or screwed into the pillar.

  In this joining metal fitting, a folded portion is provided opposite to the column fixing portion, but a fixing member such as a nail provided with a screw, a nail, and a screw thread on the peripheral surface through an opening provided in the folded portion. Can be inserted into the small hole of the column fixing portion, and the column fixing portion can be easily fixed to the column. Moreover, even if the second folded portion is provided, the column fixing portion can be similarly fixed to the column by providing a similar opening in the second folded portion.

  The invention according to claim 7 is the joining metal fitting according to claim 6, wherein when the resistance force to the relative displacement in the vertical direction generated between the column fixing portion and the brace fixing portion is set large, the folding is performed. The horizontal or vertical dimension of the opening provided in the part or the second folded part is small, and the resistance to relative displacement in the vertical direction generated between the column fixing part and the bracing fixing part is small. When setting, the dimension of the opening provided in the said folding | returning part or the said 2nd folding | turning part shall be large set in the horizontal direction or the vertical direction.

  By providing an opening in the bent portion or the bent portion and the second bent portion, the bent portion or the second bent portion is easily deformed, and by adjusting the size of the opening, the column fixing portion and The resistance force against relative displacement between the brace fixing portions can be adjusted. Therefore, it is possible to form a bearing wall of a building by selecting a joint fitting having a different opening size according to the scale or structure of the building where the braces are provided.

As described above, the load-bearing wall according to the present invention allows a large deformation in a state having a sufficient load-bearing force against a horizontal force, and avoids a sudden breakage to make a strong load-bearing wall. be able to.
Further, by using the joint fitting according to the present invention, the ends of the two braces are joined to the middle part of the column, and the braces are laid diagonally upward and diagonally downward so that the columns and braces are K-shaped. By using the load-bearing wall, it is possible to join so as to allow relative displacement between the ends of the braces and the intermediate portion of the column in a state where a sufficient resistance is acting. Thereby, it is possible to form a strong bearing wall having sufficient yield strength.

It is a schematic front view which shows the bearing wall which is one Embodiment of this invention. It is a schematic perspective view which shows the state which fixed the end of the brace to the joining corner | angular part of the column of a bearing wall shown in FIG. 1, and a horizontal member. It is a schematic perspective view which shows the joining state of the bracing of a bearing wall shown in FIG. 1, and the intermediate part of a column. It is the schematic plan view and schematic front view which show the joining state of the bracing of a bearing wall shown in FIG. 1, and the intermediate part of a pillar. It is a schematic perspective view of the joining metal fitting used for the part which joins the bracing of a bearing wall shown in FIG. 1, and the intermediate part of a column. It is the schematic plan view, schematic side view, and schematic front view of the joining metal fitting shown in FIG. It is an arrow directional view in the AA line and BB line shown in FIG. It is the schematic which shows the function of a bearing wall shown in FIG. It is the schematic plan view, schematic side view, and schematic front view of the joining metal fittings which are other embodiments of the present invention. It is an arrow line view in the CC line shown in FIG. It is the schematic plan view and schematic front view which show the state which joined the bracing and the intermediate part of the pillar using the joining metal fitting shown in FIG. It is the schematic plan view, schematic side view, and schematic front view of the joining metal fittings which are other embodiments of the present invention. It is the schematic plan view and schematic front view which show the state which joined the bracing and the intermediate part of the pillar using the joining metal fitting shown in FIG. It is a schematic perspective view which shows the state which joined the bracing and the intermediate part of the pillar using the conventional joining metal fitting. It is a figure which shows the result of the experiment conducted in order to confirm the effect by use of the joining metal fitting which concerns on this invention. It is the schematic which shows the bearing wall which is other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a load bearing wall according to an embodiment of the present invention.
This load-bearing wall is used in a wooden structure with a frame structure, and is constructed with a base 2 as a lower horizontal member supported on a concrete cloth foundation 1 and a space above the base. A rectangular frame is formed by the two pillars 3 and 4 and the beam 5 which is an upper horizontal member supported on these pillars, and the braces 6 and 7 are provided in the frame to provide a horizontal force. Resist.
In the brace, two braces 6 and 7 are arranged in one frame, and one end of the two braces are joined to each other and an intermediate portion 3a between the upper end and the lower end of the first pillar 3 is joined. It is joined to. The other end of the first brace 6 is fixed to the joint between the second column 4 and the beam 5, and the other end of the second brace 7 is secured to the joint between the second column 4 and the base 2. Has been.
In addition, the braces 9 and 10 are similarly arranged between the third column 8 which is erected so as to be adjacent to the first column 3 on the side opposite to the second column 4, and the double strength It is a wall.

The base 2, columns 3, 4, 8, beams 5, bracing 6, 7, 9, 10 are all wooden members, and the base 2 is fixed to the fabric foundation 1 by anchor bolts 11. The second pillar 4 and the third pillar 8 are also restrained by the hole-down hardware 12 so that they do not lift from the base 2 due to lift when a large horizontal force is applied during an earthquake or the like. Similarly, the joint between the second column 4 and the beam 5 and the joint between the third column 8 and the beam 5 are similarly restrained by using the metal 13 so that the beam 5 does not float from the upper surface of the columns 4 and 8. Has been.
An inter-column 14 is erected between the two columns, and the portions intersecting the braces 6, 7, 9, 10 are connected to each other using a nail 15 or the like.

The structure in which the second bracing 7 is fixed to the joint between the second column 4 and the base 2 is, as shown in FIG. 2, a corner formed by the base 2 and the second column 4, The end face of the second bracing 7 is opposed to the joining corner, and the two faces formed so as to be substantially perpendicular to each other are joined so as to abut against the upper surface of the base 2 and the side face of the second column 4. Yes. Then, the three attachment surfaces of the brace fixing metal fitting 16 are brought into contact with the upper surface of the base 2, the side surface of the second pillar 4, and the side surface of the second brace 7, and are fixed by screws or the like, so that the base 2 And the second pillar 4 and the second brace 7 are joined to each other.
Further, the structure in which the first bracing 6 is fixed to the joint between the second column 4 and the beam 5 is also the same as upside down.

  As shown in FIGS. 3 and 4, the portion where the two braces 6, 7 are joined to the first column 3 is joined to the first brace 6 and the second brace 7 by the joint fitting 20. At the same time, the end portions of the two braces 6 and 7 are joined to the intermediate portion of the first pillar 3 through the joint fitting 20.

  As shown in FIGS. 5, 6, and 7, the joint fitting 20 is formed by bending a mild steel plate, and includes a column fixing portion 21 that is fixed to a side surface of the column 3, and a column fixing. A folded portion 22 that is folded along a first folding line 25 formed along the side of the portion 21 and faces the column fixing portion 21; and the folded portion that is folded from the folded portion 22 to a second folding line 26. The second folded portion 23 provided so as to oppose to the second folded portion 22, and the second folded portion 23 is folded along the third folding line 27 to form a vertical surface perpendicular to the column fixing portion 21. The brace fixing part 24 is provided.

  The column fixing portion 21 has a vertical surface that is in contact with the side surface of the column 3, and is provided with a plurality of small holes 21 a as shown in FIG. The small hole 21a is formed so that a distal end portion of a fixing member such as a screw, a nail, or a lag screw can be inserted and screwed or driven into the pillar 3, and the first member is formed by these fixing members. It can be fixed to the side surface of the pillar 3. This column fixing portion 21 has a portion 21b whose dimension in the vertical direction is larger than that of the folded portion 22 and the brace fixing portion 24, and can be fixed using many fixing members.

The folded portion 22 is formed by being bent by approximately 180 ° along a first fold line 25 formed in the vertical direction along the side portion of the column fixing portion 21, and is substantially parallel to the column fixing portion 21. doing. As shown in FIG. 7B, the folded portion 22 has openings 22 a and 22 b at positions facing the small holes 21 a of the column fixing portion 21. These openings correspond to the small holes 21a of the column fixing portion 21 being provided in two rows, and the first opening row 22A facing one small hole row faces the other small hole row. The size of the opening 22a is larger than that of the second opening row 22B. The size of the opening 22a is such that a screw or the like can be inserted into the small hole 21a of the column fixing portion 21 and screwed into the column. And the rigidity of the joining metal fitting 20 is adjusted by adjusting the dimension of this opening 22a in the range larger than the dimension which enables screwing of the said screw | thread. That is, the relationship between the force and the displacement when the column fixing portion 21 and the brace fixing portion 24 are relatively displaced in the vertical direction can be adjusted by the size of the opening 22a, and the relative displacement. When the resistance force is set to be large, the size of the opening 22a is set to be small, and when the resistance force to relative displacement is set to be small, the size of the opening 22a is set to be large. In the present embodiment, the horizontal dimension is longer than the vertical dimension. The openings 22b of the second opening row 22B have dimensions that allow screws or the like to be inserted into the small holes 21a of the column fixing portion 21 and screwed into the columns.
The shapes of the openings 22a and 22b are preferably such that the peripheral edges are formed with smooth curves without providing angular corners. By using a smooth curve, the stress concentration during deformation of the joint fitting 20 can be relaxed.

  The second folded portion 23 is folded at a second folding line 26 set in the vertical direction along the side portion opposite to the side portion where the first folding line 25 of the folded portion 22 is provided. , Provided to face the folded portion 22. The second folded portion 23 may be provided so as to be parallel to the folded portion 22, but in the present embodiment, the second folded portion 23 is provided so as to face the folded portion 22 with a slight inclination. The second folded portion 23 is also provided with an opening 23 a at a position facing the small hole 21 a of the column fixing portion 21, and the opening 23 a provided in the second folded portion 23 and the folded portion 22 are provided. The fixing member can be inserted into the small hole 21a of the column fixing portion 21 through the provided opening 22b, and the column fixing portion 21 can be fixed to the first column 3.

  The bracing fixing portion 24 is bent at a third fold line 27 set in a vertical direction along a side portion of the second folding portion 23 opposite to the side portion continuous with the folding portion 22 to fix the column. It is formed so as to be substantially perpendicular to the portion 21. The bracing fixing portion 24 is fixed in contact with the side surfaces of the braces 6 and 7, and can be screwed or driven into the braces 6 and 7 by inserting a fixing member such as a screw, a nail or a lag screw. A plurality of small holes 24a are provided.

  As shown in FIG. 4, such a joint fitting 20 abuts the column fixing portion 21 on the side surface of the first column 3, and fixes a fixing member such as a screw 17, a nail or a lag screw from the small hole 21 a to the first. It is fixed by screwing or driving into the pillar 3. Further, the braces 6 and 7 are machined so that the end surfaces thereof have two surfaces, a vertical surface and a horizontal surface. The vertical surfaces abut on the folded-back portion 22 and the side surfaces thereof become the bracing fixing portion 24. Abutted. At this time, the horizontal end surfaces of the two braces 6 and 7 are brought into contact with each other. Then, a fixing member such as a screw 18, a nail or a lag screw is inserted into a small hole 24 a provided in the bracing fixing portion 24, and each of the two bracings 6, 7 is joined by screwing or driving into the bracing 6, 7. It is fixed to the metal fitting 20. As a result, the two braces 6 and 7 and the intermediate portion of the column 3 are joined via the joint fitting 20.

  As shown in FIG. 8, when the horizontal force acts in the direction of the arrow A, the load bearing wall provided with the two bracings 6 and 7 has a tensile force acting on the first bracing 6, A compressive force acts on the second brace 7. In the portion 3 a where the two braces 6, 7 and the middle portion of the first pillar 3 are joined, the end portions of the braces 6, 7 tend to move upward along the side surface of the first pillar 3. A force (indicated by B in FIG. 8) acts. When a horizontal force acts in the opposite direction, a compressive force acts on the first brace 6 and a tensile force acts on the second brace 7. In the portion 3 a where the two braces 6, 7 and the intermediate portion of the first pillar 3 are joined, the end portions of the braces 6, 7 tend to move downward along the side surface of the first pillar 3. Force acts. The joint fitting 20 is deformed by the force acting between the end portions of the braces 6 and 7 and the first column 3, and the end portions of the braces 6 and 7 move upward or downward with respect to the columns. To do. In other words, the column fixing portion 21 and the brace fixing portion 24 of the joint fitting 20 are continuous via the folded portion 22 and the second folded portion 23, and the folded portion 22, the second folded portion 23, and their surroundings The column fixing portion 21 and the brace fixing portion 24 are displaced relative to each other in the vertical direction, and the relative displacement between the bracings 6 and 7 and the first column 3 is allowed. Along with such relative displacement, the first pillar 3, the second pillar 4 and the beam 5 are deformed as indicated by broken lines in FIG. At this time, the joint fitting 20 is deformed between the column fixing portion 21 and the bracing fixing portion 24, but the state of being firmly fixed to the first column 3 and the bracing 6, 7 is maintained, and the end portions of the bracing 6, 7 are maintained. The displacement is allowed while maintaining the resistance against the relative displacement between the first column 3 and the first column 3. Therefore, the other ends of the braces 6 and 7 are separated from the joint between the second column 4 and the base 2 or the beam 5, or the braces 6 and 7 are joined at the joint between the braces 6 and 7 and the first column 3. Is allowed to be deformed from the side wall of the first pillar 3 before the frame body composed of the pillars 3 and 4 and the horizontal members 2 and 5 is deformed. The deformation that the frame allows until the breakage is remarkably increased as compared with the load bearing wall using the conventional joining metal fitting in which the steel plate is bent into an L shape as shown in FIG. It is hard to occur and becomes a strong bearing wall.

  In addition, the relationship between the horizontal amount acting on the bearing wall and the deformation amount of the bearing wall, that is, the level of the horizontal force when a predetermined amount of displacement occurs varies depending on the structure and scale of the building. Sometimes. On the other hand, it can respond by selecting suitably the dimension of the opening 22a provided in the folding | returning part 22 of the joining metal fitting 20. FIG. That is, when the bearing wall is difficult to deform with respect to the horizontal force, a joint fitting having a small size of the opening 22a of the folded portion 22 is selected, and when the bearing wall is easily deformed with respect to the horizontal force, the folded portion 22 A joint fitting having a large size of the opening 22a can be selected.

Next, the joining metal fitting which is other embodiment of this invention is demonstrated.
As shown in FIGS. 9, 10, and 11, the joint fitting 30 is formed by bending a mild steel plate material, and includes a column fixing portion 31 that is fixed to a side surface of the column 3, and a column fixing. A fold portion 32 that is continuous with the portion 31 and is bent at a first fold line 34 in the vertical direction and is opposed to the column fixing portion 31; and a column is fixed by being bent at a second fold line 35 in the vertical direction from the fold portion 32. A bracing fixing portion 33 that is substantially perpendicular to the portion 31 is provided.

The column fixing portion 31 is in contact with the side surface of the column 3 and is provided with small holes 31a and 31b as shown in FIG. 10, and a plurality of these small holes 31a and 31b are arranged in the vertical direction. Thus, two rows are provided in the horizontal direction. A fixing member such as a screw 17, a nail or a lag screw is inserted into these small holes 31a and 31b, and fixed to the pillar 3 by screwing or driving into the pillar 3 as shown in FIG. 11 (a). It is possible to do.
The folded portion 32 is bent at the first fold line 34 and faces the column fixing portion 31 in substantially parallel. The folded portion 32 is provided with a plurality of openings 32a, and each opening 32a is provided with one small hole 31a of the first small hole row 31A provided in the column fixing portion 31, and the second small hole row. It is a long hole in the lateral direction so as to face one small hole 31b of 31B. These openings 32a adjust the rigidity against deformation by adjusting the dimensions, similarly to the joint fitting 20 shown in FIG.
The bracing fixing portion 33 is provided with a plurality of small holes 33a for inserting fixing members such as screws, nails or lag screws, abuts against the side surfaces of the bracings 6 and 7, and braces 6 by the fixing members. , 7.

  Such a joint fitting 30 can be used to join the ends of the two braces 6 and 7 to the middle part of the first column 3 in the load bearing wall shown in FIG. Then, as shown in FIG. 11, the column fixing portion 31 is fixed to the first column 3 by a fixing member such as a screw 17, a nail or a lag screw, and the braces 6 and 7 are in contact with the folded-back portion 32. The side faces are in close contact with each other, and are fixed by screws 18 or the like while contacting the brace fixing portion 33. Further, the two braces 6 and 7 are brought into contact with each other via the brace fixing portion 33 while abutting the end surfaces in the horizontal direction. Thus, in the load-bearing wall in which the braces 6 and 7 and the first pillar 3 are joined via the joint fitting 30, the braces 6 and 7 are deformed by deformation of the folded portion 32 and its periphery when a horizontal force is applied. Relative displacement in the vertical direction is allowed between the first column 3 and the first column 3. In addition, even if the joint fitting 30 is deformed, it is not immediately destroyed, and the displacement is allowed while the state having a resistance against such a displacement is maintained. Therefore, it becomes a strong bearing wall as in the case of using the joint fitting 20 shown in FIG.

Moreover, it replaces with the joining metal fitting shown in FIG. 5, and the joining metal fitting 40 as shown in FIG.12 and FIG.13 can also be used for the load-bearing wall shown in FIG.
This joining fitting 40 is also formed by bending a mild steel plate material in the same manner as the joining fitting shown in FIG. 5 and is continuous with the column fixing portion 41 fixed to the side surface of the column 3 and the column fixing portion 41. The folded portion 42 is bent at the first folding line 44 in the vertical direction and is opposed to the column fixing portion 41, and is bent at the second folding line 45 in the vertical direction from the folded portion 42 to be substantially the same as the column fixing portion 41. A bracing fixing portion 43 having a right angle is provided.

The column fixing portion 41 is in contact with the side surface of the column 3 and has a plurality of small holes 41a and can be fixed to the column 3 with a fixing member such as a screw 17, a nail or a lag screw. It has become a thing.
The folded portion 42 is formed by being bent along a first folding line 44 set in the vertical direction, and is opposed to the column fixing portion 41 in an inclined state. The horizontal dimension of the folded portion 42 is smaller than the horizontal dimension of the column fixing portion 41 and faces only one of the two rows of small holes provided in the column fixing portion 41. . And the opening 42a is provided in the part facing these small holes 41a. These openings 42a have a circular shape that allows a fixing member such as a screw 17, a nail or a lag screw to be inserted into the small hole 41a of the column fixing portion to fix the column fixing portion 41 to the column 3. .
Further, the bracing fixing portion 43 is bent at a second folding line 45 in the vertical direction set on the side portion of the folding portion 42, and is provided substantially at right angles to the column fixing portion 41. A plurality of small holes 43a are provided.

  As shown in FIG. 13, such a joint fitting 40 has a column fixing portion 41 fixed to the first column 3 by a fixing member such as a screw 17, a nail or a lag screw, and a bracing fixing portion 43 that is brazed. It abuts against the side surfaces of 6 and 7 and is fixed by screws 18 or the like. At this time, the vertical portions formed on the end faces of the bracings 6 and 7 are in contact with or in close proximity to the column fixing portion 41, and the horizontal portions are abutted with each other and fixed to the bracing fixing portion 43. Thus, even in the load bearing wall where the bracings 6 and 7 and the first column 3 are joined via the joint fitting 40, the bracing 6 and 6 are deformed by deformation of the folded portion 42 and its periphery when a horizontal force is applied. The relative displacement between the column 7 and the column 3 is allowed, and the resistance to the displacement is maintained, so that a strong bearing wall can be obtained.

Next, when the joining metal fitting 20 of the above-described embodiment is used for joining the bracings 6 and 7 and the middle part of the first pillar 3, the upper and lower portions generated between the first pillar 3 and the bracings 6 and 7. The result of investigating the relationship between the directional force and the relative displacement will be described.
The experiment is performed by applying a force in a direction that causes a relative displacement between the column fixing portion 21 and the brace fixing portion 24 of the joint fitting 20 and measuring the displacement. The measurement was performed when using the joint fitting 20 shown in FIG. 5 (specimen 1) and when using the joint fitting 50 used in the conventional bearing wall shown in FIG. 14 (specimen 2). Compare. In addition, the conventional joining metal fitting 50 is obtained by bending a steel plate material into an L shape as shown in FIG. 14, and the bent one surface is applied to the column 3 and the other surface is applied to the side surfaces of the braces 6 and 7. It is in contact and fixed with screws or the like.

  As a result of the experiment, as shown in FIG. 15, in the experiment using the joining metal fitting 20 of the present invention, when the joining metal fitting 20 is elastically deformed, the displacement increases almost proportionally as the acting force increases. Thereafter, plastic deformation occurs, and the displacement increases while maintaining the force resisting the displacement. And, it has almost the same proof stress as when using the conventional joint metal fitting 50, and allows a significantly larger displacement than the conventional joint metal fitting until final breakage. ing.

In addition, this invention is not limited to embodiment described above, The shape of a joining metal fitting can be changed suitably and used within the scope of the present invention. Moreover, the material which comprises a joining metal fitting can use low yield point steel etc., and the metal etc. which a big plastic deformation by the time of a fracture | rupture can be used.
On the other hand, the bearing wall of the present invention is not limited to one in which two braces are arranged inside one frame surrounded by two columns and two horizontal members, as shown in FIG. As shown in FIG. 4, it is possible to arrange three braces, or four braces.

The bearing wall shown in FIG. 16A fixes one end of the first brace 61 to the joint between the second column 4 and the beam 5, and the other end of the first brace 61 and the second brace 62. One end is fixed to the middle part of the first pillar 3. Also, the other end of the second brace 62 and one end of the third brace 63 are fixed to the middle part of the second column 4, and the other end of the third brace 63 is fixed between the first column 3 and the base 2. It is fixed to the joint. And the part 64 which joins the 1st bracing 51 and the 2nd bracing 52 to the intermediate part of the 1st pillar 3, and the 2nd bracing 62 and the 3rd bracing 63 are the middle of the 2nd pillar 4. For the portion 65 to be joined to the part, the joining fitting of the present invention, for example, the joining fitting 20, 30, 40 shown in FIG. 5, FIG. 9 or FIG. 12 is used.
On the other hand, the bearing wall shown in FIG. 16 (b) is arranged with four braces, and the first brace 71 and the second brace 72 are joined to the upper middle part of the first pillar 3, The second brace 72 and the third brace 73 are joined to the intermediate part of the second column 4, and the third brace 73 and the fourth brace 74 are joined to the lower intermediate part of the first pillar 3. Yes. And the joining bracket of this invention is used for the part 75,76,77 which butts two said braces and joins to the intermediate part of the pillars 3 and 4. FIG.

1: cloth foundation, 2: foundation (horizontal material), 3: first pillar, 4: second pillar, 5: beam (horizontal material), 6: first bracing, 7: second bracing 8: third pillar 9, 10: brace, 11: anchor bolt, 12: hole down hardware, 13: hardware, 14: stud, 15: nail, 16: brace fixing bracket, 17, 18: screw,
20: Joining fitting, 21: Column fixing part, 22: Folding part, 23: Second folding part, 24: Bracing fixing part, 25: First folding line, 26: Second folding line, 27: Third Fold line,
30: Joining fitting, 31: Column fixing part, 32: Folding part, 33: Bracing fixing part, 34: First folding line, 35: Second folding line,
40: Joining fitting, 41: Column fixing part, 42: Folding part, 43: Bracing fixing part, 44: First folding line, 45: Second folding line,
50: joint fitting 61: first brace, 62: second brace, 63: third brace,
71: first bracing, 72: second bracing, 73: third bracing, 74: fourth bracing,

Claims (7)

A wooden lower horizontal member supported almost horizontally,
Wooden first pillar and second pillar erected on the lower horizontal member at an interval;
A wooden upper frame supported almost horizontally on these columns;
One end is joined to a middle portion between the upper end and the lower end of the first pillar via a joining bracket, and the other end is joined to the second pillar at a position higher than the joining position by the joining bracket. With bracing
A second brace having one end joined to the intermediate portion of the first column via the joining bracket and the other end joined to the second column at a position lower than the joining position by the joining bracket; Have
The joint fitting allows one end of two braces and the first column to which the braces are joined to be relatively displaced in the axial direction of the first pillar by deformation of the joint fitting. Bearing wall characterized by being. The joint fitting is composed of a continuous plate-shaped member,
A column fixing portion fixed in contact with a side surface of the column;
A folding portion that is continuous with the column fixing portion and is bent so as to be folded by a folding line in a vertical direction and is opposed to the column fixing portion;
2. The bracing fixing portion that is continuous with the column fixing portion via the folded portion and has a bracing fixing portion that is substantially perpendicular to the column fixing portion and is fixed to a side surface of the bracing. The bearing wall described.   3. The bearing wall according to claim 2, wherein the bracing is fixed to the bracing fixing portion in a state in which an end surface is in contact with or in close proximity to the folded portion. It consists of a continuous metal plate-like member,
A column fixing portion fixed in contact with a side surface in an intermediate portion from the upper end to the lower end of the column;
A folding portion that is continuous with the column fixing portion and is bent so as to be folded by a folding line in a vertical direction and is opposed to the column fixing portion;
A bracing fixing portion that is continuous with the column fixing portion via the turn-up portion, is substantially perpendicular to the column fixing portion, and is fixed to the side surfaces of two bracings that are installed obliquely upward and obliquely downward. A joint fitting characterized by that. A second folded portion that is continuous with the folded portion and is folded so as to be folded by a second folding line that is set substantially parallel to the folding line across the folded portion, and faces the folded portion;
The joint fitting according to claim 4, wherein the bracing fixing part is continuous with the column fixing part via the second folded part and the folded part. The column fixing portion is provided with a plurality of small holes, and is fixed to the column by a fixing member capable of driving or screwing a tip portion inserted into the small holes into the column,
An opening is provided at a position facing the small hole in the folded portion or the folded portion and the second folded portion,
The joint fitting according to claim 4 or 5, wherein the opening has a size that allows a distal end portion of the fixing member to be inserted into the small hole and driven or screwed into the pillar. . When the resistance force against the relative displacement in the vertical direction generated between the column fixing part and the brace fixing part is set to be large, the horizontal direction or the vertical direction of the opening provided in the folding part or the second folding part When the direction dimension is small and the resistance force to the relative displacement in the vertical direction generated between the column fixing part and the brace fixing part is set to be small, it is provided in the folding part or the second folding part. The joint fitting according to claim 6, wherein the horizontal or vertical dimension of the opening is set large.

Images