JP6054101B2 - Ladder bearing wall - Google Patents

Ladder bearing wall Download PDF

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JP6054101B2
JP6054101B2 JP2012188920A JP2012188920A JP6054101B2 JP 6054101 B2 JP6054101 B2 JP 6054101B2 JP 2012188920 A JP2012188920 A JP 2012188920A JP 2012188920 A JP2012188920 A JP 2012188920A JP 6054101 B2 JP6054101 B2 JP 6054101B2
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bearing wall
ladder
cross member
stiffening
wall frame
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JP2014047469A (en
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西村 健
健 西村
大幸 市岡
大幸 市岡
前田 珠希
珠希 前田
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Daiwa House Industry Co Ltd
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この発明は、鉄骨系等の建築物に用いられるはしご形耐力壁フレームに関する。   The present invention relates to a ladder-type load-bearing wall frame used for a building such as a steel frame.

建築物に用いられる耐力壁フレームとして、2本の平行に立てられる金属製の縦材と、これら縦材間に上下に並べて架設された複数本の金属製の横材とを備えるはしご形耐力壁フレームが知られている(例えば特許文献1)。
特許文献1に開示されたはしご形耐力壁フレームでは、図7に示すように、横材23を断面H字状としてそのウェブが垂直となるように縦材22,22間に架設し、横材23のウェブに複数の塑性変形用の孔25を形成することで、前記孔25の周囲の部分を地震時の水平力により塑性変形する塑性変形部としている。また、前記孔25の周縁にはリブ(図示せず)を形成して、孔の周縁からクラックが入るのを抑制している。
As a load bearing wall frame used in a building, a ladder-shaped load bearing wall provided with two metal vertical members standing in parallel and a plurality of metal horizontal members laid up and down between the vertical members. A frame is known (for example, Patent Document 1).
In the ladder-type bearing wall frame disclosed in Patent Document 1, as shown in FIG. 7, the cross member 23 has an H-shaped cross-section and is laid between the vertical members 22 and 22 so that the web is vertical. By forming a plurality of plastic deformation holes 25 in the web 23, a portion around the holes 25 is formed as a plastic deformation portion that is plastically deformed by a horizontal force during an earthquake. Further, ribs (not shown) are formed on the periphery of the hole 25 to prevent cracks from entering from the periphery of the hole.

特開2005−325637号公報JP 2005-325637 A

上記構成のはしご形耐力壁フレームの場合、横材23の端部が溶接される縦材22の腹部において面外変形が生じ易い。特に、縦材22が角パイプでダイヤフラム等がない場合に縦材フランジで面外変形が生じ易い。この面外変形に伴う耐力・剛性の低下が問題となる。   In the case of the ladder-type bearing wall frame having the above-described configuration, out-of-plane deformation is likely to occur in the abdomen of the vertical member 22 to which the end of the cross member 23 is welded. In particular, when the vertical member 22 is a square pipe and there is no diaphragm or the like, out-of-plane deformation is likely to occur at the vertical member flange. Decrease in yield strength and rigidity associated with this out-of-plane deformation becomes a problem.

この問題を回避するための対策として、図6のように横材23の端部を、当て板24を介して縦材22の腹部に接合させることも可能であるが、この場合には製作性が低下し、またコストアップを招くという新たな問題が生じる。   As a measure for avoiding this problem, it is possible to join the end of the cross member 23 to the abdomen of the vertical member 22 via the contact plate 24 as shown in FIG. Decreases, and a new problem of increasing costs arises.

また、上記構成のはしご形耐力壁フレームでは、2本の縦材22,22の間隔が広い場合、耐力・剛性の低下も問題となる。すなわち、2本の縦材22,22の間隔が広いと、架設される横材23の材長が長くなり曲げ剛性が低下する。これにより耐力壁の耐力・剛性が低下する。また、横材23は、その長さが一定以上になると曲げ降伏が支配的となるが、そこを無理にせん断降伏させようとすると、上記の横材23のウェブに設ける孔25の個数を多くする必要がある。しかし、これでは、ウェブの断面欠損が大きくなり、鋼材が経済的に使用されているとは言い難い。
上記の構成のままで、耐力・剛性をアップさせようとすると、縦材や横材の断面を大きくせざるを得ず、コストアップは免れない。
Further, in the ladder-type load-bearing wall frame configured as described above, when the distance between the two vertical members 22 and 22 is wide, a decrease in yield strength and rigidity is also a problem. That is, when the interval between the two vertical members 22 is wide, the length of the cross member 23 to be installed becomes long and the bending rigidity is lowered. As a result, the proof stress / rigidity of the load bearing wall decreases. Further, when the length of the cross member 23 becomes a certain length or more, the bending yield becomes dominant. However, when it is attempted to forcibly yield the shear, the number of holes 25 provided in the web of the cross member 23 is increased. There is a need to. However, in this case, the cross-sectional defect of the web becomes large, and it is difficult to say that steel is economically used.
If it is going to raise proof stress and rigidity with said structure, it will be necessary to enlarge the cross section of a vertical member or a transverse member, and cost increase cannot be avoided.

この発明の目的は、耐力、剛性、およびエキルギー吸収能力を向上させることができるはしご形耐力壁フレームを提供することである。   An object of the present invention is to provide a ladder-type load-bearing wall frame capable of improving yield strength, rigidity, and energy absorption capacity.

この発明のはしご形耐力壁フレームは、2本の平行に立てられる金属製の縦材と、これら縦材間に上下に並べて架設された複数本の金属製の横材とを備えるはしご形耐力壁フレームにおいて、
前記横材の両端部、それぞれこの横材を補剛する補剛部材を介して前記両縦材に接合され、前記補剛部材は、前記縦材の表面に面接触して接合される板部と、前記横材の側面にこの側面の高さ方向の全体に渡り面接触して接合される板部とを有し、この横材の側面に接して接合される板部は、前記横材の端部に剛域を形成し横材のせん断スパン比を小さくさせることができる横材長手方向の長さを有する
The ladder-type load-bearing wall frame of the present invention includes a ladder-type load-bearing wall provided with two metal vertical members standing in parallel, and a plurality of metal cross members arranged vertically between the vertical members. In the frame,
Plate opposite ends of the cross member is being respectively joined to the transverse member to the both longitudinal member via a stiffening member for stiffening the stiffening member is in surface contact with and joined to the surface of the longitudinal member parts and the crosspiece side in contact over surface throughout the height direction of the side surface of possess a plate portion joined, the plate portion joined in contact with a side surface of the lateral member, the lateral It has a length in the longitudinal direction of the cross member that can form a rigid region at the end of the material and reduce the shear span ratio of the cross member .

この構成によると、横材の両端部を、それぞれこの横材を補剛する補剛部材を介して両縦材に接合するので、横材の端部に剛域が形成され、その端部および端部近傍の耐力と剛性を確保することができる。2本の縦材の間隔が広い場合でも、上記のように補剛部材を介して横材の両端部を縦材に接合することから、横材の端部に剛域が形成されて、横材のせん断スパン比を小さくすることができ、簡易にせん断降伏させることができる。すなわち、横材が曲げ降伏する場合は、繰り返し荷重により圧縮フランジの座屈等で耐力が低下するため、せん断降伏とすることが好ましいが、せん断降伏とする場合は横材のせん断スパン比が課題となる。しかし、上記のように剛域が形成されて容易にせん断スパン比が小さくなることで、せん断降伏となる。せん断降伏となることで、曲げ降伏の場合に比べて安定したエネルギー吸収となり易い。   According to this configuration, since both ends of the cross member are joined to both vertical members via the stiffening members that stiffen the cross member, a rigid region is formed at the end of the cross member. Yield strength and rigidity in the vicinity of the end can be ensured. Even when the distance between the two vertical members is wide, both ends of the cross member are joined to the vertical member via the stiffening member as described above, so that a rigid region is formed at the end of the cross member, The shear span ratio of the material can be reduced, and shear yield can be easily achieved. In other words, when the cross member yields a bending yield, the yield strength is reduced due to the buckling of the compression flange due to repeated loading, so it is preferable to use the shear yield, but when using the shear yield, the shear span ratio of the cross member is a problem. It becomes. However, since a rigid zone is formed as described above and the shear span ratio is easily reduced, shear yielding occurs. By becoming shear yielding, it becomes easier to absorb stable energy than in the case of bending yielding.

この発明において、前記補剛部材が平板形状であって、前記両板部が同一平面で続き、前記縦材における耐力壁の壁面に対して平行となる表面と、この表面と同一平面に揃えられる前記横材の前記側面とにそれぞれ接合されるようにしても良い。
この構成の場合、前記縦材の前記補剛部材が接合される箇所が、横材の長手方向に沿う表面となるため、横材の長手方向に垂直となる表面に接合する場合と異なり、縦材の接合部における面外変形の問題がなくなり、より一層、耐力,剛性が向上する。
In this invention, the stiffening member has a flat plate shape, the both plate portions continue in the same plane, and are aligned with the surface parallel to the wall surface of the load bearing wall of the vertical member and the same plane. You may make it join to the said side surface of the said cross member, respectively.
In the case of this configuration, the portion where the stiffening member of the longitudinal member is joined is a surface along the longitudinal direction of the transverse member, so that unlike the case of joining to the surface perpendicular to the longitudinal direction of the transverse member, The problem of out-of-plane deformation at the joint portion of the material is eliminated, and the yield strength and rigidity are further improved.

この発明において、前記補剛部材が、前記縦材における耐力壁の壁面に対して垂直となる表面に面接触する板部と、前記横材の前記側面に面接触する板部とでなるL字形状であっても良い。この構成の場合、縦材の壁面と平行な表面に前記補剛部材が突出せず、納まりが良くなる。   In this invention, the said stiffening member is an L-shape comprising a plate portion in surface contact with a surface perpendicular to the wall surface of the load bearing wall in the longitudinal member and a plate portion in surface contact with the side surface of the transverse member. It may be a shape. In the case of this configuration, the stiffening member does not protrude from the surface parallel to the wall surface of the vertical member, and the fit is improved.

この発明において、前記横材の両端部における、前記補剛部材との接合部から外れる箇所であってその接合部の近傍にのみ、せん断降伏誘発用の孔設けられていても良い。この場合に、前記横材の両端部となる各箇所に設けられる前記各せん断降伏誘発用の孔をそれぞれ複数であっても良い。
前記補剛部材により横材のせん断スパンが小さくなりせん断降伏し易くなっているうえに、このように横材の両端部にせん断降伏誘発用の孔を設けた場合、横材のせん断降伏をさらに助長させることができる。また、前記孔が横材の両端部に設けられていると、横材の端部に塑性ヒンジが形成され、塑性変形領域が大きくなる。その結果、大変形時における変形代を稼ぎ塑性変形能力を向上させることができる。
また、せん断降伏誘発用の孔を設けた場合、前記補剛部材の大きさの設計による横材のせん断耐力、剛性の調整に加え、前記孔の大小や数により、せん断耐力、剛性の調整が可能になる。
In the present invention, that put the two ends of the crosspiece, pre-SL only in the vicinity of its junction with a portion deviating from the joint between the stiffening member may be is provided holes for shear yield induced . In this case, the holes for the shear yield inducing provided in each portion which becomes both end portions of the crosspiece may each be plural.
In addition to reducing the shear span of the cross member by the stiffening member and facilitating the shear yield, when the holes for inducing shear yield are provided at both ends of the cross member in this way, the shear yield of the cross member is further increased. Can be encouraged. Further, when the hole is provided at both ends of the cross member, a plastic hinge is formed at the end of the cross member, and the plastic deformation region becomes large. As a result, the deformation allowance at the time of large deformation can be earned and the plastic deformation ability can be improved.
In addition, when a hole for shear yield induction is provided, in addition to adjusting the shear strength and stiffness of the cross member by designing the size of the stiffening member, the shear strength and stiffness can be adjusted depending on the size and number of the holes. It becomes possible.

この発明のはしご形耐力壁フレームは、2本の平行に立てられる金属製の縦材と、これら縦材間に上下に並べて架設された複数本の金属製の横材とを備えるはしご形耐力壁フレームにおいて、前記横材の両端部、それぞれこの横材を補剛する補剛部材を介して前記両縦材に接合され、前記補剛部材は、前記縦材の表面に面接触して接合される板部と、前記横材の側面にこの側面の高さ方向の全体に渡り面接触して接合される板部とを有し、この横材の側面に接して接合される板部は、前記横材の端部に剛域を形成し横材のせん断スパン比を小さくさせることができる横材長手方向の長さを有するため、耐力、剛性、およびエキルギー吸収能力を向上させることができる。 The ladder-type load-bearing wall frame of the present invention includes a ladder-type load-bearing wall provided with two metal vertical members standing in parallel, and a plurality of metal cross members arranged vertically between the vertical members. In the frame, both end portions of the cross member are joined to the vertical members via stiffening members that stiffen the cross member, and the stiffening members are joined in surface contact with the surface of the vertical member. a plate portion that is, the crosspiece side in contact over surface throughout the height direction of the side surface of possess a plate portion joined, the plate portion joined in contact with a side surface of the crossmember Since it has a length in the longitudinal direction of the cross member that can reduce the shear span ratio of the cross member by forming a rigid region at the end of the cross member, it is possible to improve proof stress, rigidity, and energy absorption capacity .

(A)はこの発明の一実施形態に係るはしご形耐力壁フレームの正面図、(B)は同側面図である。(A) is a front view of the ladder-type bearing wall according to one embodiment of the present invention, (B) is a side view of the same. 同はしご形耐力壁フレームの一施工例を示す正面図である。It is a front view which shows one construction example of the ladder type bearing wall frame. 同はしご形耐力壁フレームにおける縦材と横材の接合部の正面図、平面図、側面図および背面図である。It is the front view, top view, side view, and rear view of the junction part of the vertical member and cross member in the ladder-shaped bearing wall. 同はしご形耐力壁フレームの横材における孔位置の違いによる塑性変形能力の変化を示す説明図である。It is explanatory drawing which shows the change of the plastic deformation capability by the difference in the hole position in the cross member of the ladder-shaped bearing wall. この発明の他の実施形態にかかるはしご形耐力壁フレームにおける縦材と横材の接合部の正面図、平面図、側面図および背面図である。It is the front view, top view, side view, and rear view of the junction part of the vertical member and cross member in the ladder-shaped load-bearing wall frame concerning other embodiment of this invention. 従来例における縦材と横材の接合部での補剛構造の一例の斜視図である。It is a perspective view of an example of the stiffening structure in the junction part of the vertical member and horizontal member in a prior art example. 従来のはしご形耐力壁フレームの正面図である。It is a front view of the conventional ladder-shaped bearing wall.

この発明の一実施形態を図1ないし図4と共に説明する。図1(A),(B)は、このはしご形耐力壁フレームの正面図および側面図である。このはしご形耐力壁フレーム1は、2本の平行に立てられる金属製の縦材2,2と、これら縦材2,2間に上下に並べて架設された複数本の金属製の横材3とを備える。図示の例では、4本の横材3を上下に等間隔に並べて架設した例を示している。縦材2には角形鋼管が用いられ、横材3には溝形鋼が用いられている。溝形鋼からなる横材3は、図3(C)に示すように、そのウェブ部3aが垂直となる姿勢で両縦材2,2間に架設され、ウェブ部3aの外面となる側面が縦材2の耐力壁背面側の表面2aと同一平面に揃えられる。溝形鋼からなる横材3は、そのウェブ部3aでせん断力を負担し、フランジ部3bで曲げモーメントを負担する。   An embodiment of the present invention will be described with reference to FIGS. FIGS. 1A and 1B are a front view and a side view of the ladder-type bearing wall frame. The ladder-shaped load-bearing wall frame 1 includes two parallel vertical metal members 2 and 2, and a plurality of horizontal metal members 3 arranged vertically between the vertical members 2 and 2. Is provided. In the example shown in the figure, an example is shown in which four cross members 3 are laid up and down at equal intervals. A square steel pipe is used for the vertical member 2 and a grooved steel is used for the cross member 3. As shown in FIG. 3C, the cross member 3 made of channel steel is constructed between the vertical members 2 and 2 in a posture in which the web portion 3a is vertical, and the side surface which is the outer surface of the web portion 3a is formed. The longitudinal members 2 are aligned with the surface 2a on the back side of the bearing wall. The cross member 3 made of channel steel bears a shearing force at the web portion 3a and bears a bending moment at the flange portion 3b.

横材3の両端部は、それぞれこの横材3を補剛する補剛部材4を介して縦材2に接合されている。ここでは補剛部材4として矩形の平板形状の鋼板が用いられる。具体的には、図3(A)〜(D)に横材3の端部の縦材2への接合部の正面図、平面図、側面図および背面図を示すように、平板形状の補剛部材4は、耐力壁の壁面と平行になる垂直姿勢とされて、その左右の板部4a,4bのうちの一方の板部4aが、縦材2の壁面と平行な表面2aに面接触して溶接により接合される。他方の板部4bは、横材3の側面となる前記ウェブ部3aの外面に、この外面の高さ方向の全体に渡り面接触して溶接により接合される。前記他方の板部4bは、前記横材3の端部に剛域を形成し横材3のせん断スパン比を小さくさせることができる横材長手方向の長さを有する。
Both ends of the cross member 3 are joined to the vertical member 2 via stiffening members 4 that stiffen the cross member 3. Here, a rectangular flat plate-shaped steel plate is used as the stiffening member 4. Specifically, as shown in FIGS. 3A to 3D, a front view, a plan view, a side view, and a rear view of the joining portion of the end portion of the cross member 3 to the longitudinal member 2 are used as flat plate-shaped auxiliary members. The rigid member 4 is in a vertical posture parallel to the wall surface of the load bearing wall, and one of the left and right plate portions 4a and 4b is in surface contact with the surface 2a parallel to the wall surface of the longitudinal member 2. And joined by welding. The other plate portion 4b is joined to the outer surface of the web portion 3a serving as a side surface of the cross member 3 by welding in contact with the entire surface in the height direction of the outer surface . The other plate portion 4b has a length in the longitudinal direction of the cross member that can form a rigid region at the end of the cross member 3 and reduce the shear span ratio of the cross member 3.

横材3の両端部には、ウェブ部3aにおける前記補剛部材4との接合部から外れる箇所に、せん断降伏誘発用の孔5が設けられている。横材3の両端部となる各箇所に設けられるせん断降伏誘発用の孔5は、それぞれ複数とされ、ここでは、2つの孔5を縦に並べて設けている。なお、孔5は、1つでも3つ以上でも良く、また必ずしも設けなくても良い。   At both ends of the cross member 3, holes 5 for inducing shear yielding are provided at locations where the web portion 3a is removed from the joint with the stiffening member 4. There are a plurality of shear yield inducing holes 5 provided at the respective ends which are both ends of the cross member 3, and here, two holes 5 are provided side by side. The number of the holes 5 may be one or three or more, and it is not always necessary to provide them.

このはしご形耐力壁フレーム1は、例えば図2のように、鉄骨系のラーメン構造の建物Aにおいて、隣合う柱10,10間の任意の箇所において、基礎11と1階の梁12との間に配置される。はしご形耐力壁フレーム1は、建物Aの各階層の上側の梁と下側の梁との間に配置しても良く、また複数の階層の渡る高さとしても良い。前記建物Aは、戸建て住宅であっても、集合住宅や事務所、商業施設となる建物であっても良く、また、2階建て、3階建て、それ以上、または1階建など、任意の階層の建物であっても良い。
はしご形耐力壁フレーム1の幅は、例えば、建物Aのモジュールを1Pとすると、0.5Pや1Pの幅とされる。上記モジュールは、例えば、910mm、1000mmなど、モジュール設計仕様によって任意の長さに設計される。
For example, as shown in FIG. 2, the ladder-type load-bearing wall frame 1 is provided between a foundation 11 and a first-floor beam 12 at an arbitrary position between adjacent columns 10 and 10 in a steel-framed ramen structure building A. Placed in. The ladder-shaped load-bearing wall frame 1 may be disposed between the upper beam and the lower beam of each level of the building A, or may have a height across a plurality of levels. The building A may be a detached house, an apartment house, an office, a building that becomes a commercial facility, or any two-story, three-story, more, or one-story building. It may be a hierarchical building.
For example, when the module of the building A is 1P, the width of the ladder-shaped load-bearing wall frame 1 is 0.5P or 1P. The module is designed to have an arbitrary length according to a module design specification such as 910 mm and 1000 mm, for example.

この構成のはしご形耐力壁フレーム1によると、横材3の両端部を、この横材3の側面に面接触して接合されて横材3を補剛する補剛部材4を介し、縦材2に接合したので、その端部および端部近傍の耐力と剛性を確保することができる。また、補剛部材4は平板形状であって、縦材2の前記補剛部材4が接合される箇所が、横材3の長手方向に沿う表面2aとなるため、横材3の長手方向に垂直となる表面に従来の図6の例のように当て板24で接合する場合と異なり、縦材2の接合部における縦材フランジの面外変形の問題がなくなり、より一層、耐力が向上する。図6の当て板24では、その周囲の全周溶接が必要となるが、この実施形態の補剛部材4では、全周溶接の回避によって製作性を向上させ、コストダウンを図ることができる。   According to the ladder-type bearing wall frame 1 having this configuration, both ends of the cross member 3 are joined in surface contact with the side surface of the cross member 3 and the stiffener member 4 for stiffening the cross member 3 is used to connect the vertical member. Since it joined to 2, the proof stress and rigidity of the edge part and edge part vicinity can be ensured. Further, the stiffening member 4 has a flat plate shape, and the portion where the stiffening member 4 of the longitudinal member 2 is joined becomes the surface 2a along the longitudinal direction of the transverse member 3, so that the longitudinal direction of the transverse member 3 is increased. Unlike the case of joining to the vertical surface with the contact plate 24 as in the conventional example of FIG. 6, there is no problem of out-of-plane deformation of the longitudinal member flange at the joining portion of the longitudinal member 2, and the proof stress is further improved. . In the contact plate 24 of FIG. 6, all-around welding around it is necessary. However, in the stiffening member 4 of this embodiment, the productivity can be improved by avoiding the all-around welding, and the cost can be reduced.

また、平行に立てられる2本の縦材2の間隔が広い場合でも、上記したように補剛部材4を介して横材3の両端部を縦材2に接合していることから、横材3の端部近傍に剛域が設けられて、横材3のせん断スパンを小さくすることができ、簡易にせん断降伏させることができる。これにより、震動等に対する安定したエネルギー吸収が行える。
すなわち、曲げ降伏型では、横材3の上下フランジ部3b,3bのうちの圧縮側フランジ部の座屈や溶接部での震動エネルギー吸収により、ループを繰り返しすうちにエネルギー吸収能力が低下していく。一方、ウェブ部3aのせん断降伏型では、板要素の降伏が支配的となるため、安定したエネルギー吸収と成り易い。
Further, even when the interval between the two vertical members 2 standing in parallel is wide, both ends of the horizontal member 3 are joined to the vertical member 2 via the stiffening member 4 as described above. A rigid region is provided in the vicinity of the end portion of 3, the shear span of the cross member 3 can be reduced, and the shear yield can be easily performed. Thereby, the stable energy absorption with respect to a vibration etc. can be performed.
That is, in the bending yield type, the energy absorption capacity decreases while the loop is repeated due to buckling of the compression side flange portion of the upper and lower flange portions 3b, 3b of the cross member 3 and vibration energy absorption at the welded portion. Go. On the other hand, in the shear yield type of the web portion 3a, the yield of the plate element is dominant, and thus stable energy absorption is likely to occur.

また、この実施形態では、上記したように補剛部材4の介在で横材3のせん断スパンが小さくなりせん断降伏し易くなっているうえに、横材3の両端部にせん断降伏誘発用の孔5を設けたので、横材3のせん断降伏をさらに助長させることができる。せん断降伏誘発用の孔5は、せん断力を負担する横材3のウェブ部3aに設けられているので、せん断降伏の助長により効果的である。また、孔5の周辺に塑性域が形成されることから、最大耐力後の塑性変形能力が高められる。
また、前記孔5が横材3の両端部に設けられているため、横材3の両端部に塑性ヒンジが形成され、塑性変形領域が大きくなる。その結果、大変形時における変形代を稼ぎ、塑性変形能力を向上させることができる。
Further, in this embodiment, as described above, the shear span of the cross member 3 is reduced by the interposition of the stiffening member 4 to facilitate shear yielding, and shear yield inducing holes are formed at both ends of the cross member 3. Since 5 is provided, the shear yield of the cross member 3 can be further promoted. Since the shear yield inducing hole 5 is provided in the web portion 3a of the cross member 3 that bears the shearing force, it is more effective in promoting shear yield. Further, since a plastic region is formed around the hole 5, the plastic deformation ability after the maximum proof stress is enhanced.
Further, since the holes 5 are provided at both end portions of the cross member 3, plastic hinges are formed at both end portions of the cross member 3, and the plastic deformation region becomes large. As a result, a deformation allowance at the time of large deformation can be earned and the plastic deformation ability can be improved.

図4(A)は、前記せん断降伏誘発用の孔5(ここでは孔5が1つの例を示す)を両端部に設けた横材3と、その場合に形成される塑性ヒンジの模式図とを示している。図4(B)は、前記せん断降伏誘発用の孔5を中央部に設けた横材3と、その場合に形成される塑性ヒンジの模式図とを示している。これらの図からわかるように、横材3の両端部に前記孔5を設けた図4(A)の場合には、横材3の両端部に塑性ヒンジが形成されて大変形時の変形代を稼ぐことができる。横材3の中央部に前記孔5を設けた図4(B)の場合には塑性変形領域が限定的となり、図4(A)の場合に比べて塑性変形能力が劣る。   FIG. 4A is a schematic diagram of a cross member 3 provided with both ends of the shear yield inducing hole 5 (here, one example of the hole 5), and a plastic hinge formed in that case. Is shown. FIG. 4B shows a cross member 3 in which the shear yield-inducing hole 5 is provided in the center, and a schematic view of a plastic hinge formed in that case. As can be seen from these drawings, in the case of FIG. 4A in which the holes 5 are provided at both ends of the cross member 3, plastic hinges are formed at both ends of the cross member 3, so that the deformation allowance at the time of large deformation is large. Can earn. In the case of FIG. 4 (B) in which the hole 5 is provided in the center of the cross member 3, the plastic deformation region is limited, and the plastic deformation ability is inferior to that in the case of FIG. 4 (A).

図5は、この発明の他の実施形態を示す。このはしご形耐力壁フレーム1では、図1〜図4に示した先の実施形態において、横材3を補剛する補剛部材4Aとして、縦材2の、耐力壁の壁面に対して垂直となる表面2bに面接触する板部4Aaと、横材3の側面となるウエブ部3aの外面に面接触する板部4AbとでなるL字形状のものが用いられる。補剛部材4Aは、アングル材であっても、鋼板の曲げ加工品であっても良い。図5(A)〜(D)は、この場合の横材3の端部の縦材2への接合部の正面図、平面図、側面図および背面図を示す。その他の構成、例えば縦材2および横材3として用いられる鋼材、横材3の姿勢などの構成は、先の実施形態の場合と同様である。また、作用についても、この実施形態では縦材2の面外変形の防止の効果は先の実施形態に比べて低く、かつ縦材2の壁面と平行な表面に補剛部材4Aが突出なくて納まりが良くなるという効果が得られるが、その他の作用効果は先の実施形態と同様に得られる。   FIG. 5 shows another embodiment of the present invention. In this ladder-shaped bearing wall 1, in the previous embodiment shown in FIGS. 1 to 4, the vertical member 2 is perpendicular to the wall of the bearing wall as the stiffening member 4 </ b> A for stiffening the cross member 3. An L-shaped member is used that includes a plate portion 4Aa that is in surface contact with the surface 2b and a plate portion 4Ab that is in surface contact with the outer surface of the web portion 3a that is the side surface of the cross member 3. The stiffening member 4A may be an angle member or a bent product of a steel plate. FIGS. 5A to 5D show a front view, a plan view, a side view, and a rear view of the joint portion of the end of the cross member 3 to the vertical member 2 in this case. Other configurations, for example, the steel material used as the vertical member 2 and the cross member 3, the posture of the cross member 3, and the like are the same as those in the previous embodiment. As for the action, in this embodiment, the effect of preventing out-of-plane deformation of the longitudinal member 2 is lower than that of the previous embodiment, and the stiffening member 4A does not protrude from the surface parallel to the wall surface of the longitudinal member 2. Although the effect that the accommodation is improved is obtained, other functions and effects are obtained in the same manner as in the previous embodiment.

1…はしご形耐力壁フレーム
2…縦材
2a,2b…表面
3…横材
3a…ウェブ部
4,4A…補剛部材
4a,4b,4Aa,4Ab…板部
5…せん断降伏誘発用の孔
DESCRIPTION OF SYMBOLS 1 ... Ladder-shaped load-bearing wall frame 2 ... Vertical member 2a, 2b ... Surface 3 ... Cross member 3a ... Web part 4, 4A ... Stiffening member 4a, 4b, 4Aa, 4Ab ... Plate part 5 ... Hole for shear yield induction

Claims (5)

2本の平行に立てられる金属製の縦材と、これら縦材間に上下に並べて架設された複数本の金属製の横材とを備えるはしご形耐力壁フレームにおいて、
前記横材の両端部、それぞれこの横材を補剛する補剛部材を介して前記両縦材に接合され、前記補剛部材は、前記縦材の表面に面接触して接合される板部と、前記横材の側面にこの側面の高さ方向の全体に渡り面接触して接合される板部とを有し、この横材の側面に接して接合される板部は、前記横材の端部に剛域を形成し横材のせん断スパン比を小さくさせることができる横材長手方向の長さを有するはしご形耐力壁フレーム。
In a ladder-shaped load-bearing wall frame comprising two parallel metal vertical members, and a plurality of metal cross members laid side by side between the vertical members,
Plate opposite ends of the cross member is being respectively joined to the transverse member to the both longitudinal member via a stiffening member for stiffening the stiffening member is in surface contact with and joined to the surface of the longitudinal member parts and the crosspiece side in contact over surface throughout the height direction of the side surface of possess a plate portion joined, the plate portion joined in contact with a side surface of the lateral member, the lateral A ladder-shaped load-bearing wall frame having a length in the longitudinal direction of the transverse member that can form a rigid region at the end of the member and reduce the shear span ratio of the transverse member .
請求項1に記載のはしご形耐力壁フレームにおいて、前記補剛部材が平板形状であって、前記両板部が同一平面で続き、前記縦材における耐力壁の壁面に対して平行となる表面と、この表面と同一平面に揃えられる前記横材の前記側面とにそれぞれ接合されるはしご形耐力壁フレーム。   The ladder-type bearing wall frame according to claim 1, wherein the stiffening member has a flat plate shape, the two plate portions continue in the same plane, and are parallel to the wall surface of the bearing wall in the longitudinal member. Ladder-type load-bearing wall frames that are respectively joined to the side surfaces of the cross member that are flush with the surface. 請求項1に記載のはしご形耐力壁フレームにおいて、前記補剛部材が、前記縦材における耐力壁の壁面に対して垂直となる表面に面接触する板部と、前記横材の前記側面に面接触する板部とでなるL字形状であるはしご形耐力壁フレーム。   2. The ladder-type bearing wall frame according to claim 1, wherein the stiffening member faces a surface of the vertical member in contact with a surface perpendicular to a wall surface of the bearing wall, and faces the side surface of the transverse member. A ladder-shaped load-bearing wall frame that is L-shaped with a plate part in contact. 請求項1ないし請求項3のいずれか1項に記載のはしご形耐力壁フレームにおいて、前記横材の両端部における、前記補剛部材との接合部から外れる箇所であってその接合部の近傍にのみ、せん断降伏誘発用の孔設けられたはしご形耐力壁フレーム。 In ladder bearing walls frame according to any one of claims 1 to 3, that put the two ends of the crosspiece, the junction a portion deviating from the junction of the front Symbol stiffening member in the vicinity of only ladder bearing wall frame holes are provided for shear yield induced. 請求項4に記載のはしご形耐力壁フレームにおいて、前記横材の両端部に設けられる前記せん断降伏誘発用の孔それぞれ複数であるはしご形耐力壁フレーム。 The ladder-type bearing wall frame according to claim 4, wherein there are a plurality of shear yield-inducing holes provided at both ends of the cross member.
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