JP3951785B2 - Damper for beam support in concrete frame - Google Patents

Damper for beam support in concrete frame Download PDF

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Publication number
JP3951785B2
JP3951785B2 JP2002120550A JP2002120550A JP3951785B2 JP 3951785 B2 JP3951785 B2 JP 3951785B2 JP 2002120550 A JP2002120550 A JP 2002120550A JP 2002120550 A JP2002120550 A JP 2002120550A JP 3951785 B2 JP3951785 B2 JP 3951785B2
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Japan
Prior art keywords
column
joint
concrete
joined
receiving
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JP2002120550A
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JP2003313945A (en
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直幹 丹羽
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鹿島建設株式会社
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Description

【0001】
【発明の属する技術分野】
この発明はコンクリートの柱とプレキャストコンクリートの梁からなる架構の柱・梁接合部において、梁の架設時に梁を支持しながら、地震時の柱・梁の相対変形時にエネルギ吸収能力を発揮するコンクリート造架構における梁受け材兼用ダンパに関するものである。
【0002】
【従来の技術及び発明が解決しようとする課題】
コンクリートの柱とプレキャストコンクリートの梁からなる架構の柱・梁接合部に、地震時の柱・梁間の相対変形時にエネルギ吸収機能を持たせようとする場合、特開平11-172761号の図6、図7のようにダンパを柱・梁間に跨って架設し、双方に接合することが行われるが、ダンパはエネルギ吸収のための専用の部材であるため、梁を柱に圧着接合する緊張材とは別にダンパを設置することが必要になり、柱・梁の架構内に設置のための特別な空間を確保しなければならない。同様のことは柱・梁の架構が鉄骨造の場合である特開2001-254436についても言える。
【0003】
ダンパを柱・梁接合部に設置する場合、架構全体では多数のダンパにエネルギを分散させて吸収させることから、ダンパの設置数が多くなるか、一個当たりのダンパの規模が大きくなる傾向があるため、ダンパが梁の下、もしくは上に突出することで、ダンパの設置が仕上げの障害になることが多い上、柱・梁からなる架構内で確保できる開口部の大きさを制限することになる。
【0004】
この発明は上記背景より、柱・梁接合部においてダンパ設置のための格別な空間を必要としない形態のダンパを提案するものである。
【0005】
【課題を解決するための手段】
本発明ではコンクリートの柱とプレキャストコンクリートの梁からなる架構において、柱の梁との接合部に接合され、梁の架設時に梁を支持する梁受け材をダンパとして兼用することにより、ダンパ設置のための格別な空間を不要にし、もしくは削減し、仕上げ上の障害の問題と、開口部への制約の問題を回避する。
【0006】
請求項1に係るコンクリート造架構における梁受け材兼用ダンパは、コンクリートの柱にプレキャストコンクリートの梁を架設するための梁受け材であり、柱に接合される柱接合部と梁に接合される梁接合部とからなるL形の形状を有し、梁の柱に対する相対変形時にエネルギを吸収するエネルギ吸収部を梁接合部に多数の孔を穿設することにより形成してあることを特徴とするものである。
梁受け材は、梁の架設後に梁に接合されることにより柱の側面と梁の下端間に跨る。梁受け材はエネルギ吸収機能を持ちながらも、梁の架設時には梁を支持する機能を有すればよいことから、少なくとも柱に接合される柱接合部と、梁に接合される梁接合部を持てばよいため、仕上げと開口部の空間へ影響を与えることがない。形態上は、柱接合部と梁接合部が共に板状で、梁受け材自体がアングル形状であるため最も単純な形となる。
【0007】
梁受け材のエネルギ吸収部は柱と梁の相対変形時に負担する引張力や曲げモーメント、またはせん断力、あるいはその組合せ応力により降伏し、弾塑性履歴吸収エネルギにより地震時のエネルギを吸収する。
【0008】
梁受け材が梁の下端側に位置することで、架構に図2−(a) に示す平常状態から水平力により(b)に示すような水平変形を生じ、梁2の下端と柱1側面との間に変位が生じたとき、エネルギ吸収部が形成される梁接合部、または連結部には引張力と曲げモーメントが作用し、エネルギ吸収部の、多数の孔以外の部分が伸び変形、もしくは曲げ変形し、降伏して塑性変形することによりエネルギを吸収する。すなわち、エネルギ吸収部は板部分に多数の孔が穿設されることにより、その他の部分より相対的に降伏耐力が低下させられた形で形成される。
【0009】
梁受け材兼用ダンパは請求項1に記載のように柱に接合される柱接合部と、梁に接合される梁接合部のみを持つ場合と、請求項2〜4に記載のように柱接合部と梁接合部の他、両接合部間に跨る連結部を持つ場合があり、前者の場合、エネルギ吸収部は梁接合部に形成され、後者の場合は梁接合部と連結部のいずれかに形成される。
【0011】
エネルギ吸収部が連結部に形成される場合、連結部は例えば両端において柱接合部と梁接合部に接合される板状に形成される。この場合、連結部は梁の側面に平行に配置される場合と、それに直交した形で配置される場合がある。
【0012】
連結部が板状の場合、連結部を1枚の板から構成する場合もあるが、請求項に記載のように複数枚の板から構成し、各板の降伏応力を変化させる等により調整することで、連結部全体としての降伏時の応力を多段階に設定することができる他、エネルギ吸収量を自由に設定することも可能になる。
【0013】
【発明の実施の形態】
この発明は図1に示すようにコンクリートの柱1とプレキャストコンクリートの梁2からなる架構において、柱1の梁2との接合部に接合され、梁2の架設時に梁2を支持し、梁2の架設後に梁2に接合され、梁2の柱1に対する相対変形時にエネルギを吸収するエネルギ吸収部30を有する梁受け材兼用ダンパ(以下梁受け材)3である。柱1はプレキャストコンクリートの場合と現場打ちコンクリート造、または両者の複合構造や、SRC造等の場合がある。
【0014】
柱1と梁2は中実断面材であるか中空断面材であるかを問わず、架構は接合部において図示するように柱1が貫通する形式であるか梁2が貫通する形式であるかを問わない。柱1と梁2は断面形状に応じ、PC鋼棒等の鋼材を用いた圧着接合の他、接合部への配筋とコンクリートの打設により接合される。
【0015】
梁受け材3は図3−(a) に示すように基本的に柱1に接合される柱接合部31と、梁2に接合される梁接合部32からL形の形状をし、(b)に示すように柱接合部31と梁接合部32間に連結部33が跨り、双方に接合された形をする場合もある。前者の場合、エネルギ吸収部30は梁接合部31に、後者の場合は柱接合部31、または連結部33に形成される。図3中、点を付した部分がエネルギ吸収部30を示す。
【0016】
柱接合部31と梁接合部32にはそれぞれ柱1と梁2に接合されるためのボルト孔が形成され、各ボルト孔にボルト4,5が付属する。梁受け材3は予め柱接合部31においてボルト4により柱1に接合され、柱1,1間に梁2が架設され、梁接合部32上に梁2が載置されたときに梁接合部32がボルト5により梁2に接合される。
【0017】
図4は図3−(a) に示す形の具体的な例として梁接合部32のエネルギ吸収部30を多数の孔3aを穿設することにより形成した場合を示す。図4−(a) は図3−(a) の詳細を、(b)はその底面を示す。梁接合部32のエネルギ吸収部30はボルト5との干渉が生じない部分に形成される。
【0018】
孔3aの形状は問われないが、図2−(b) に示す架構の変形により梁接合部32に梁2の軸方向に引張力が作用したとき、梁接合部32の孔3a以外の部分が曲げモーメントによって降伏することから、孔3aは孔3a以外の部分が均等に降伏し、効率的にエネルギを吸収するよう、図4−(b)に示すように梁2の軸方向に複数列配列し、各列の孔3aは千鳥状に配置される。
【0019】
図5は図3−(b) に示す形の具体的な例として連結部33が柱接合部31と梁接合部32のそれぞれの面に垂直な面をなして双方に接合される板である場合を示す。連結部33である板33aの形状、枚数は問われないが、板33aは梁接合部32に作用する梁2の軸方向の引張及び回転によって降伏するように配置される。
【0020】
図5では平板状の板33aの両端間距離を稼ぐために板33aの両側を曲線状に切断した上で、板33aを梁2の側面に平行な面をなして配置し、また連結部33全体としてのエネルギ吸収効果を上げるために複数枚(2枚)の板33a,33aを梁2の幅方向に平行に配置しているが、板33a自体を曲面状に加工し、図5の場合の板33aに直交する面をなして配置する場合もある。いずれの場合も、板33aはボルト4,5との干渉が生じないように配置され、梁接合部32に梁2の軸方向に引張及び回転が発生したときの引張力と曲げモーメントにより降伏する。
【0021】
図5のように連結部33をエネルギ吸収部30として利用し、1枚、もしくは複数枚の板33aから構成する場合、板33aに図4と同様の多数の孔3aを形成し、塑性変形能力を高めることもある。
【0022】
この他、連結部33は梁2の軸方向の引張力と曲げモーメントによって降伏すればよいことから、連結部33自体を棒状その他の形状に形成することもある。
【0023】
【発明の効果】
コンクリートの柱とプレキャストコンクリートの梁からなる架構において、柱の梁との接合部に接合され、梁の架設時に梁を支持する梁受け材をダンパとして兼用するため、ダンパ設置のための格別な空間が不要になるか削減され、仕上げ上の障害の問題と、開口部への制約の問題が回避される。
【0024】
また、柱接合部と梁接合部が共に板状で、梁受け材自体が最も単純なアングル形状であるため、仕上げ上の問題と、開口部への問題が最小に抑えられる。
【0025】
請求項では連結部を複数枚の板から構成するため、連結部全体としての降伏時の応力を多段階に設定することができる上、エネルギ吸収量を自由に設定することもできる。
【図面の簡単な説明】
【図1】柱・梁の架構と梁受け材との関係を示した立面図である。
【図2】 (a) は平常時の柱・梁接合部を示した立面図、(b)は水平力作用時の柱・梁接合部を示した立面図である。
【図3】 (a) は梁接合部にエネルギ吸収部を形成した場合の梁受け材を示した図1の破線円部分の拡大図、(b)は連結部にエネルギ吸収部を形成した場合の梁受け材を示した図1の破線円部分の拡大図である。
【図4】 (a) は図3−(a) の具体例を示した拡大図、(b)は(a) の底面図である。
【図5】 (a) は図3−(b)の具体例を示した拡大図、(b)は(a) の底面図である。
【符号の説明】
1……柱、2……梁、3……梁受け材、30……エネルギ吸収部、31……柱接合部、32……梁接合部、3a……孔、33……連結部、33a……板、4,5……ボルト。
[0001]
BACKGROUND OF THE INVENTION
The present invention provides a concrete structure that exhibits energy absorption capability in the case of relative deformation of a column / beam during an earthquake while supporting the beam when the beam is installed in a column / beam joint of a frame consisting of a concrete column and a precast concrete beam. The present invention relates to a beam receiving material combined damper in a frame.
[0002]
[Prior art and problems to be solved by the invention]
In the case where an energy absorbing function is to be given to a column / beam joint of a frame consisting of a concrete column and a precast concrete beam at the time of relative deformation between the columns and beams during an earthquake, FIG. 6 of JP-A-11-172761 As shown in FIG. 7, a damper is installed between the pillar and the beam and joined to both. However, since the damper is a dedicated member for absorbing energy, In addition, it is necessary to install a damper separately, and a special space for installation must be secured in the column / beam frame. The same can be said for Japanese Patent Application Laid-Open No. 2001-254436, in which the column / beam frame is a steel structure.
[0003]
When installing dampers at column / beam joints, energy is distributed and absorbed by a large number of dampers in the entire frame, which tends to increase the number of dampers installed or increase the size of each damper. Therefore, because the damper protrudes under or above the beam, the installation of the damper often becomes an obstacle to finishing, and limits the size of the opening that can be secured in the frame composed of columns and beams Become.
[0004]
In view of the above background, the present invention proposes a damper in a form that does not require a special space for installing a damper at a column / beam joint.
[0005]
[Means for Solving the Problems]
In the present invention, in a frame composed of a concrete column and a precast concrete beam, the beam receiving material that is joined to the joint of the column beam and supports the beam when the beam is installed is also used as a damper. This eliminates or reduces the extra space, avoiding problems with finishing and constraining openings.
[0006]
The damper for a beam receiver in a concrete structure according to claim 1 is a beam receiver for laying a precast concrete beam on a concrete column, and a beam connected to the column joint and the beam joined to the column. It has an L-shape consisting of a joint part, and an energy absorption part that absorbs energy at the time of relative deformation with respect to a beam column is formed by drilling a number of holes in the beam joint part. Is.
The beam receiving material is straddled between the side surface of the column and the lower end of the beam by being joined to the beam after the beam is installed. Also the beam receiving material while having an energy absorbing function, since it you have a function of supporting the beam at the time of erection of the beam less and a pillar joining portion joined to the column even Joints to be joined to the beam So that it does not affect the finish and the space of the opening. In terms of form, both the column joint portion and the beam joint portion are plate-like, and the beam receiving material itself is an angle shape, so that the shape is the simplest.
[0007]
The energy absorbing portion of the beam receiving material yields by a tensile force, a bending moment, a shearing force, or a combination stress imposed when the column and the beam are relatively deformed, and absorbs the energy at the time of earthquake by the elastic-plastic hysteresis energy absorption.
[0008]
When the beam receiving material is located on the lower end side of the beam, horizontal deformation as shown in (b) occurs from the normal state shown in Fig. 2- (a) to the frame by horizontal force. When a displacement occurs between the energy absorbing portion, the tensile force and the bending moment act on the beam joint portion where the energy absorbing portion is formed, or the connecting portion, and the portions other than the numerous holes of the energy absorbing portion are stretched and deformed. Alternatively, the energy is absorbed by bending deformation, yielding, and plastic deformation. That is, the energy absorbing part is formed in a form in which the yield strength is relatively lowered as compared with other parts by making a large number of holes in the plate part.
[0009]
The beam receiving material combined damper has a column joint portion joined to the column as described in claim 1 and a beam joint portion joined only to the beam, and a column joint as claimed in claims 2 to 4. In some cases, the energy absorption part is formed in the beam joint part, and in the latter case, either the beam joint part or the connection part. Formed.
[0011]
If the energy absorbing portion is formed in the connecting portion, the connecting portion is formed in a plate shape which is joined to the pillar junction and Joints at both ends, for example. In this case, the connecting portion may be arranged in parallel to the side surface of the beam, or may be arranged in a shape orthogonal thereto.
[0012]
In the case where the connecting portion is plate-shaped, the connecting portion may be constituted by a single plate, but it is constituted by a plurality of plates as described in claim 3 and adjusted by changing the yield stress of each plate, etc. By doing so, it is possible to set the yield stress as a whole of the connecting portion in multiple stages and to set the energy absorption amount freely.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the present invention is a structure comprising a concrete column 1 and a precast concrete beam 2 and is joined to a joint portion between the column 1 and the beam 2 to support the beam 2 when the beam 2 is installed. This is a beam receiving material combined damper (hereinafter referred to as a beam receiving material) 3 having an energy absorbing portion 30 which is joined to the beam 2 after the construction of the beam 2 and absorbs energy when the beam 2 is deformed relative to the column 1. The pillar 1 may be precast concrete, cast-in-place concrete, a composite structure of both, SRC, or the like.
[0014]
Whether the column 1 and the beam 2 are solid cross-section members or hollow cross-section members, whether the frame is a form in which the columns 1 penetrate or a form in which the beams 2 penetrate as shown in the joint. It doesn't matter. The column 1 and the beam 2 are joined by a bar arrangement to the joint and placement of concrete, in addition to a crimp joint using a steel material such as a PC steel bar, according to the cross-sectional shape.
[0015]
As shown in FIG. 3 (a), the beam receiving member 3 basically has an L shape from a column joint 31 joined to the column 1 and a beam joint 32 joined to the beam 2. ), The connecting portion 33 may straddle between the column joint portion 31 and the beam joint portion 32 and may be joined to both. In the former case, the energy absorbing portion 30 is formed in the beam joint portion 31, and in the latter case, the energy absorbing portion 30 is formed in the column joint portion 31 or the connecting portion 33. In FIG. 3, the part with a dot indicates the energy absorbing unit 30.
[0016]
Bolt holes for joining the column 1 and the beam 2 are formed in the column joint 31 and the beam joint 32, respectively, and bolts 4 and 5 are attached to each bolt hole. The beam receiving member 3 is previously joined to the column 1 by the bolt 4 at the column joint 31, the beam 2 is installed between the columns 1 and 1, and the beam 2 is placed on the beam joint 32. 32 is joined to the beam 2 by a bolt 5.
[0017]
FIG. 4 shows a case where the energy absorbing portion 30 of the beam joint portion 32 is formed by drilling a large number of holes 3a as a specific example of the shape shown in FIG. Fig. 4- (a) shows the details of Fig. 3- (a), and (b) shows the bottom. The energy absorbing portion 30 of the beam joint portion 32 is formed in a portion where no interference with the bolt 5 occurs.
[0018]
The shape of the hole 3a is not limited, but when tensile force acts on the beam joint 32 in the axial direction of the beam 2 due to the deformation of the frame shown in FIG. 2- (b), the part other than the hole 3a of the beam joint 32 Since the hole 3a yields due to the bending moment, the holes 3a are arranged in a plurality of rows in the axial direction of the beam 2 as shown in FIG. The holes 3a in each row are arranged in a staggered manner.
[0019]
FIG. 5 shows a specific example of the shape shown in FIG. 3- (b), in which the connecting portion 33 forms a surface perpendicular to the respective surfaces of the column joint portion 31 and the beam joint portion 32 and is joined to both. Show the case. The shape and the number of the plates 33a which are the connecting portions 33 are not limited, but the plates 33a are arranged so as to yield by the axial tension and rotation of the beam 2 acting on the beam joint portion 32.
[0020]
In FIG. 5, in order to increase the distance between both ends of the flat plate 33a, both sides of the plate 33a are cut in a curved shape, and then the plate 33a is arranged in a plane parallel to the side surface of the beam 2, and the connecting portion 33 In order to increase the energy absorption effect as a whole, a plurality of (two) plates 33a, 33a are arranged in parallel to the width direction of the beam 2, but the plate 33a itself is processed into a curved shape, as shown in FIG. In some cases, the plate 33a is arranged on a plane orthogonal to the plate 33a. In any case, the plate 33a is arranged so as not to interfere with the bolts 4 and 5, and yields due to the tensile force and bending moment when the beam joint 32 is pulled and rotated in the axial direction of the beam 2. .
[0021]
When the connecting portion 33 is used as the energy absorbing portion 30 as shown in FIG. 5 and is composed of one or a plurality of plates 33a, a number of holes 3a similar to those shown in FIG. May increase.
[0022]
In addition, since the connecting portion 33 has only to yield by the tensile force and bending moment of the beam 2 in the axial direction, the connecting portion 33 itself may be formed in a bar shape or other shapes.
[0023]
【The invention's effect】
In a frame structure consisting of concrete columns and precast concrete beams, it is joined to the joints of the columns and the beam receiving material that supports the beams when they are installed is also used as a damper. Is eliminated or reduced, avoiding problems with finishing and constraining openings.
[0024]
In addition, since both the column joint and the beam joint are plate-like and the beam receiving member itself has the simplest angle shape, problems in finishing and problems with the opening can be minimized.
[0025]
According to the third aspect of the present invention , since the connecting portion is composed of a plurality of plates, it is possible to set the stress at the time of yielding as the whole connecting portion in multiple stages and to set the energy absorption amount freely.
[Brief description of the drawings]
FIG. 1 is an elevation view showing a relationship between a column / beam frame and a beam receiving member.
2A is an elevation view showing a column / beam joint in a normal state, and FIG. 2B is an elevation view showing the column / beam joint when a horizontal force is applied.
3A is an enlarged view of a broken line circle portion of FIG. 1 showing a beam receiving material when an energy absorbing portion is formed at a beam joint portion, and FIG. 3B is a case where an energy absorbing portion is formed at a connecting portion. It is the enlarged view of the broken-line circle | round | yen part of FIG.
4A is an enlarged view showing a specific example of FIG. 3-A, and FIG. 4B is a bottom view of FIG.
5A is an enlarged view showing a specific example of FIG. 3B, and FIG. 5B is a bottom view of FIG.
[Explanation of symbols]
1 ... Column, 2 ... Beam, 3 ... Beam receiving material, 30 ... Energy absorbing part, 31 ... Column joint, 32 ... Beam joint, 3a ... Hole, 33 ... Connecting part, 33a ...... Plate, 4, 5 ... Bolt.

Claims (4)

  1. コンクリートの柱プレキャストコンクリートの梁を架設するための梁受け材であり、前記柱に接合される柱接合部と前記梁に接合される梁接合部とからなるL形の形状を有し、前記梁の前記柱に対する相対変形時にエネルギを吸収するエネルギ吸収部を前記梁接合部に多数の孔を穿設することにより形成してあることを特徴とするコンクリート造架構における梁受け材兼用ダンパ。 A beam receiving material for laying a precast concrete beam on a concrete column , having an L-shape formed by a column joint joined to the column and a beam joint joined to the beam, beam receiving member combined damper in concrete Frames, characterized in that is formed by drilling a number of holes of the energy absorbing unit that absorbs energy during relative variations to the pillar of the beam to the beam joint portion.
  2. コンクリートの柱にプレキャストコンクリートの梁を架設するための梁受け材であり、前記柱に接合される柱接合部と前記梁に接合される梁接合部とからなるL形の形状を有し、さらに前記柱接合部と前記梁間に跨る連結部を有し、前記連結部を梁の柱に対する相対変形時にエネルギを吸収するエネルギ吸収部としたことを特徴とするコンクリート造架構における梁受け材兼用ダンパ。A beam receiving material for laying a precast concrete beam on a concrete column, and having an L shape comprising a column joint joined to the column and a beam joint joined to the beam, A damper for a beam receiving material in a concrete frame, characterized in that it has a connecting part straddling between the column joint and the beam, and the connecting part is an energy absorbing part that absorbs energy when the beam is deformed relative to the column.
  3. 前記連結部は両端において前記柱接合部と前記梁接合部に接合される複数枚の板から構成されていることを特徴とする請求項2記載のコンクリート造架構における梁受け材兼用ダンパ。3. The damper for a beam receiving material in a concrete structure according to claim 2, wherein the connecting portion is composed of a plurality of plates joined at both ends to the column joint portion and the beam joint portion.
  4. コンクリートの柱にプレキャストコンクリートの梁を架設するための梁受け材であり、前記柱に接合される柱接合部と前記梁に接合される梁接合部とからなるL形の形状を有し、さらに前記柱接合部と前記梁間に跨る連結部を有し、梁の柱に対する相対変形時にエネルギを吸収するエネルギ吸収部を前記連結部に多数の孔を穿設することにより形成してあることを特徴とするコンクリート造架構における梁受け材兼用ダンパ。A beam receiving material for laying a precast concrete beam on a concrete column, and having an L shape comprising a column joint joined to the column and a beam joint joined to the beam, It has a connecting portion straddling between the column joint and the beam, and an energy absorbing portion that absorbs energy at the time of relative deformation with respect to the column of the beam is formed by drilling a large number of holes in the connecting portion. This is a damper for both beam supports in concrete frames.
JP2002120550A 2002-04-23 2002-04-23 Damper for beam support in concrete frame Expired - Fee Related JP3951785B2 (en)

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JP4602693B2 (en) * 2004-04-28 2010-12-22 株式会社熊谷組 Damping structure
JP6393476B2 (en) * 2013-12-25 2018-09-19 株式会社竹中工務店 Column beam connection structure

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JPH0841985A (en) * 1994-07-28 1996-02-13 Fudo Kenken Kk Method of binding precast beam to column
JPH11172761A (en) * 1997-12-12 1999-06-29 Takenaka Komuten Co Ltd Rc-based vibration control structure
JP4181680B2 (en) * 1998-11-02 2008-11-19 新日本製鐵株式会社 Damping brace damper, energy absorber used therefor, and design method thereof
JP3842484B2 (en) * 1999-05-19 2006-11-08 積水ハウス株式会社 Column and beam joint structure and building having the same
JP3629638B2 (en) * 2000-03-09 2005-03-16 新日本製鐵株式会社 Steel column and steel beam joint structure for steel structure with high rigidity and excellent damage controllability

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