JP2011058264A - Buckling restraining brace - Google Patents

Buckling restraining brace Download PDF

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JP2011058264A
JP2011058264A JP2009209448A JP2009209448A JP2011058264A JP 2011058264 A JP2011058264 A JP 2011058264A JP 2009209448 A JP2009209448 A JP 2009209448A JP 2009209448 A JP2009209448 A JP 2009209448A JP 2011058264 A JP2011058264 A JP 2011058264A
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brace
buckling
reinforced concrete
beam member
concrete beam
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JP5498103B2 (en
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Keiji Masuda
圭司 増田
Daisuke Katsura
大輔 桂
Kenichi Tahara
健一 田原
Satoshi Sasaki
聡 佐々木
Tsugio Torii
次夫 鳥居
Yasuto Sasaki
康人 佐々木
Izumi Suzuki
泉 鈴木
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Fujita Corp
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Fujita Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a buckling restraining brace having a thinner and light-weight reinforced concrete stiffener as compared with a conventional brace. <P>SOLUTION: The buckling restraining brace 10 includes a brace core member 12 composed of steel member undergoing plastic deformation so as to expand/shrink under a longitudinal compression load and a tensile load, and a buckling restraining stiffener stiffening the brace core member preventing the brace core member under the longitudinal compression load from buckling. The stiffener includes a reinforced concrete beam member 14 extending in parallel with the brace core member while surrounding the circumference of the brace core member in an unbonded state relative to the brace core member. The reinforced concrete beam member 14 includes a plurality of main reinforcements 18 and a band reinforcement 20 surrounding around the circumference of the main reinforcements. The main reinforcements have a reinforcement amount in a tension reinforcement ratio pt within a range of 0.005 to 0.030, with the outer circumferential surface of the reinforced concrete beam member 14 covered with a decorative layer 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は座屈拘束ブレースに関する。   The present invention relates to a buckling restrained brace.

座屈拘束ブレースは制振ダンパの一種であり、建築構造物の骨組にブレースとして組込まれ、地震等によってその骨組に大きな変形が生じたときに、振動エネルギを吸収するように機能するダンパである。座屈拘束ブレースは１９８０年代後半から開発され、現在では数多くの製品が市販されている。座屈拘束ブレースは、長手方向の圧縮荷重及び引張荷重を受けて伸縮するように塑性変形する鋼材から成るブレース芯材と、長手方向の圧縮荷重を受けたブレース芯材が座屈するのを防止するべくブレース芯材を補剛する座屈拘束用の補剛材とを備えている。補剛材としては、ブレース芯材の側面ないし側縁に相対滑り可能に当接する鋼管等の鋼材で構成した補剛材や、ブレース芯材を囲繞する鋼管または鋼板製の収容体とこの収容体の中に充填するコンクリートやモルタルなどの硬化性の充填材とで構成し、硬化した充填材の表面がブレース芯材の表面にアンボンド状態で当接するようにした補剛材が用いられている。また更に、ブレース芯材を囲繞する補剛材を鉄筋コンクリートで構成し、そのコンクリートの表面がブレース芯材の表面にアンボンド状態で当接するようにすることも提案されている。座屈拘束ブレースを開示した先行技術文献としては、例えば以下に示す特許文献１、特許文献２などがある。   A buckling-restrained brace is a type of damping damper that is built into a framework of a building structure as a brace and functions to absorb vibration energy when large deformation occurs in the framework due to an earthquake or the like. . Buckling-restrained braces have been developed since the late 1980s, and many products are now on the market. The buckling-restrained brace prevents buckling of a brace core material made of steel that is plastically deformed so as to expand and contract in response to a longitudinal compressive load and tensile load, and a brace core material subjected to a longitudinal compressive load. And a buckling-restraining stiffener for stiffening the brace core. As the stiffener, a stiffener made of a steel material such as a steel pipe that slidably contacts the side surface or side edge of the brace core material, a steel pipe or steel plate container surrounding the brace core material, and this container body. A stiffening material is used which is composed of a curable filler such as concrete or mortar to be filled therein, and in which the surface of the cured filler comes into contact with the surface of the brace core material in an unbonded state. Furthermore, it has also been proposed that the stiffening material surrounding the brace core material is made of reinforced concrete so that the surface of the concrete abuts the surface of the brace core material in an unbonded state. Prior art documents disclosing buckling-restrained braces include, for example, Patent Document 1 and Patent Document 2 shown below.

特開２００７−２９１７０４JP2007-291704A 特開２００８−００２１３３JP 2008-002133 A

上に挙げたような様々な構造の補剛材のうち、鉄筋コンクリート製の補剛材には、製作コストが低廉であるという利点がある一方で、コンクリートにひび割れが生じないだけの十分な強度を持たせようとすると、その他の構造の補剛材と比べて太さ及び重量がかなり大きくなってしまうという短所が付随していた。座屈拘束ブレースは、その補剛材の太さ及び重量が大きいと全体が大型化及び重量化するために建築構造物に組込みにくくなり、従って利用しにくくなる。そのため、鉄筋コンクリート製の補剛材を用いた座屈拘束ブレースはこれまで、その他の構造の補剛材を用いた座屈拘束ブレースほど広くは用いられていなかった。   Of the various stiffeners listed above, reinforced concrete stiffeners have the advantage of low manufacturing costs, while providing sufficient strength to prevent cracks in the concrete. Attempts to do so were accompanied by the disadvantage that the thickness and weight would be considerably greater than other stiffeners. When the thickness and weight of the stiffener is large, the buckling-restraining brace becomes large and heavy as a whole, so that it is difficult to incorporate the buckling restrained brace into a building structure, and therefore, it is difficult to use. For this reason, buckling-restrained braces using reinforced concrete stiffeners have not been used as widely as buckling-restrained braces using other stiffeners.

本発明は上記課題を解決するべくなされたものであり、本発明の目的は、従来の鉄筋コンクリート製の補剛材と比べて、より細身で軽量の鉄筋コンクリート製の補剛材を備え、それによって、より広く用いることができるようにした座屈拘束ブレースを提供することにある。   The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a stiffener made of reinforced concrete that is thinner and lighter than conventional reinforced concrete stiffeners. An object of the present invention is to provide a buckling restrained brace that can be used more widely.

本発明に係る座屈拘束ブレースは、長手方向の圧縮荷重及び引張荷重を受けて伸縮するように塑性変形する鋼材から成るブレース芯材と、長手方向の圧縮荷重を受けた前記ブレース芯材が座屈するのを防止するべく前記ブレース芯材を補剛する座屈拘束用の補剛材とを備え、前記補剛材は、前記ブレース芯材に対してアンボンド状態で前記ブレース芯材の周囲を囲繞して前記ブレース芯材と平行に延在する鉄筋コンクリート製ビーム部材から成り、該鉄筋コンクリート製ビーム部材は、該鉄筋コンクリート製ビーム部材の長手方向に延在する複数本の主筋とそれら主筋の周囲を囲繞する帯筋とを備えており、前記主筋の鉄筋量は引張鉄筋比ｐｔが０．００５〜０．０３０の範囲内となる鉄筋量であり、前記鉄筋コンクリート製ビーム部材はその外周面を被覆する化粧層を備えていることを特徴とする。   The buckling-restrained brace according to the present invention includes a brace core material made of a steel material that is plastically deformed so as to expand and contract in response to a longitudinal compressive load and a tensile load, and the brace core material that has received the longitudinal compressive load is seated. A buckling-restraining stiffening material that stiffens the brace core material to prevent bending, and the stiffener material surrounds the brace core material in an unbonded state with respect to the brace core material. The reinforced concrete beam member extends in parallel with the brace core, and the reinforced concrete beam member surrounds a plurality of main bars extending in the longitudinal direction of the reinforced concrete beam member and the periphery of the main bars. The reinforcing bar amount of the main reinforcing bar is a reinforcing bar amount in which the tensile reinforcing bar ratio pt is within the range of 0.005 to 0.030, and the reinforced concrete beam member is Characterized in that it comprises a decorative layer covering the outer peripheral surface.

前記化粧層は、前記鉄筋コンクリート製ビーム部材の外周面に塗装により形成され、前記鉄筋コンクリート製ビーム部材の外周面にひび割れが発生したときに弾性伸展し得る弾性塗膜から成るものとするとよい。   The decorative layer may be formed by coating the outer peripheral surface of the reinforced concrete beam member, and may be formed of an elastic coating that can elastically extend when cracks occur on the outer peripheral surface of the reinforced concrete beam member.

また、前記弾性塗膜を防水性塗膜とするのもよい。   The elastic coating film may be a waterproof coating film.

前記鉄筋コンクリート製ビーム部材は、その外周面に前記帯筋と平行に延在する目地が形成されたものとするのもよい。   The reinforced concrete beam member may be formed with a joint extending on the outer peripheral surface thereof in parallel with the band.

或いはまた、前記化粧層を、前記鉄筋コンクリート製ビーム部材の外周面に巻かれた化粧薄板から成るものとするのもよい。   Alternatively, the decorative layer may be made of a decorative thin plate wound around the outer peripheral surface of the reinforced concrete beam member.

前記ビーム芯材は横断面形状が十字形の鋼材から成るものとするのもよい。   The beam core may be made of a steel material having a cross-shaped cross section.

別法として、前記ビーム芯材を一定の厚さ及び幅を有する平鋼板の形状の鋼材から成るものとするのもよく、その場合に、前記帯筋のピッチは前記平鋼板の厚さの１０倍以下のピッチとし、前記帯筋の鉄筋量は、該帯筋が前記ブレース芯材の降伏軸力×０．０２以上の引張力を負担し得る鉄筋量とするのもよい。   Alternatively, the beam core material may be made of a steel material in the shape of a flat steel plate having a constant thickness and width, in which case the pitch of the band is 10 times the thickness of the flat steel plate. The pitch of the reinforcing bars may be set to a pitch less than double, and the reinforcing bar amount of the reinforcing bars may be the amount of reinforcing bars that can bear the tensile force of the yield axis force of the brace core material of 0.02 or more.

前記ブレース芯材の周囲に薄い鋼板が巻付けられており、該鋼板と前記ブレース芯材とが相対的に摺動することで前記ブレース芯材と前記鉄筋コンクリート製ビーム部材とがアンボンド状態とされているようにするのもよい。   A thin steel plate is wound around the brace core material, and the brace core material and the reinforced concrete beam member are unbonded by relatively sliding the steel plate and the brace core material. It is also good to be.

また、前記鉄筋コンクリート製ビーム部材が、該鉄筋コンクリート製ビーム部材の長手方向に圧縮荷重を導入するプレストレスト・コンクリート鋼線を備えているようにするのもよい。   The reinforced concrete beam member may include a prestressed concrete steel wire that introduces a compressive load in the longitudinal direction of the reinforced concrete beam member.

本発明に係る座屈拘束ブレースによれば、比較的低コストで製作することのできる鉄筋コンクリート製の補剛材を、従来のものと比べてより細身で軽量にすることができ、そのため本発明に係る座屈拘束ブレースはより広範に利用することが可能である。   According to the buckling restrained brace according to the present invention, a reinforced concrete stiffener that can be manufactured at a relatively low cost can be made thinner and lighter than conventional ones. Such a buckling restrained brace can be used more widely.

（Ａ）及び（Ｂ）は夫々、本発明の第１の実施の形態に係る座屈拘束ブレースの側面図及び横断面図である。(A) And (B) is the side view and cross-sectional view of a buckling restraint brace concerning a 1st embodiment of the present invention, respectively. 本発明の第２の実施の形態に係る座屈拘束ブレースの横断面図である。It is a cross-sectional view of the buckling restrained brace according to the second embodiment of the present invention. 本発明の第３の実施の形態に係る座屈拘束ブレースの横断面図である。It is a cross-sectional view of a buckling restrained brace according to a third embodiment of the present invention.

図１の（Ａ）及び（Ｂ）に示したのは本発明の第１の実施の形態に係る座屈拘束ブレース１０である。座屈拘束ブレース１０は制振ダンパの一種であり、建築構造物の骨組にブレースとして組込まれ、地震等によってその骨組に大きな変形が生じたときに振動エネルギを吸収するように機能する。   1A and 1B show a buckling restrained brace 10 according to the first embodiment of the present invention. The buckling-restrained brace 10 is a kind of damping damper, and is incorporated as a brace in a framework of a building structure, and functions to absorb vibration energy when a large deformation occurs in the framework due to an earthquake or the like.

座屈拘束ブレース１０は、長手方向の圧縮荷重及び引張荷重を受けて伸縮するように塑性変形する細長い鋼材から成るブレース芯材１２を備えており、このブレース芯材１２は例えば低降伏点鋼などをはじめとする様々な種類の鋼材で製作される。また、図示例のブレース芯材１２は、帯板状の平鋼板を組合せて溶接して、横断面形状が十字形の鋼材としたものである。   The buckling-restrained brace 10 includes a brace core material 12 made of an elongated steel material that is plastically deformed so as to expand and contract in response to a compressive load and a tensile load in the longitudinal direction. The brace core material 12 is, for example, a low yield point steel or the like. Manufactured with various kinds of steel materials including Further, the brace core material 12 in the illustrated example is a steel material having a cross-shaped cross-sectional shape that is welded by combining strip-shaped flat steel plates.

座屈拘束ブレース１０は更に、長手方向の圧縮荷重を受けたブレース芯材１２が座屈するのを防止するべくこのブレース芯材１２を補剛する座屈拘束用の補剛材を備えており、この補剛材は鉄筋コンクリート製ビーム部材１４から成る。鉄筋コンクリート製ビーム部材１４は、ブレース芯材１２に対してアンボンド状態でブレース芯材１２の周囲を囲繞しており、ブレース芯材１２と平行に延在している。ブレース芯材１２の両端は鉄筋コンクリート製ビーム部材１４の両端から外部へ突出しており、この座屈拘束ブレース１０を建築構造物に装備する際には、ブレース芯材１２のそれら両端を例えばガセットプレート（不図示）などを介して建築構造物の骨組の柱と梁とに夫々連結するなどして取付けが行われる。   The buckling-restrained brace 10 further includes a buckling-restraining stiffener that stiffens the brace core 12 to prevent buckling of the brace core 12 that has received a longitudinal compressive load. This stiffener comprises a reinforced concrete beam member 14. The reinforced concrete beam member 14 surrounds the periphery of the brace core material 12 in an unbonded state with respect to the brace core material 12, and extends parallel to the brace core material 12. Both ends of the brace core 12 protrude outward from both ends of the beam member 14 made of reinforced concrete. When the buckling restraint brace 10 is mounted on a building structure, the both ends of the brace core 12 are, for example, gusset plates ( (Not shown) or the like is attached to each of the columns and beams of the framework of the building structure.

鉄筋コンクリート製ビーム部材１４は、この鉄筋コンクリート製ビーム部材１４の長手方向に延在する複数本の主筋１８と、それら主筋１８の周囲を囲繞する帯筋２０とを備えている。この鉄筋コンクリート製ビーム部材１４を製作する際には、例えば、型枠内に主筋１８及び帯筋２０を配筋し、また、表面にグリースなどの適当なアンボンド剤を塗布したブレース芯材１２を型枠内に適切に位置付けた上で、その型枠内にコンクリートを打設して充填するようにすればよい。尚、その他の適宜の製作工程とすることも可能である。   The reinforced concrete beam member 14 includes a plurality of main bars 18 extending in the longitudinal direction of the reinforced concrete beam member 14 and band bars 20 surrounding the main bars 18. When this reinforced concrete beam member 14 is manufactured, for example, a main brace 18 and a band 20 are arranged in a mold, and a brace core material 12 having a surface coated with a suitable unbonding agent such as grease is used as a mold. After positioning appropriately in the frame, concrete may be cast and filled in the mold. It should be noted that other appropriate manufacturing processes may be employed.

鉄筋コンクリート製ビーム部材１４の主筋１８の鉄筋量は引張鉄筋比ｐｔが０．００５〜０．０３０の範囲内となる鉄筋量としている。この鉄筋量は、鉄筋コンクリート製ビーム部材１４にひび割れが発生しても、その剛性が大きく低下することがなく、なお補剛材として充分な機能を果たすことを保証し得る鉄筋量であり、鉄筋コンクリート製ビーム部材１４にひび割れが発生するのを防止することを保証するものではない。本発明においては補剛材にひび割れが発生するのを防止することよりも、補剛材の太さ及び重量をできるだけ小さくすることの方を重視している。そして、補剛材である鉄筋コンクリート製ビーム部材１４に、また特にその外周面に、ひび割れが発生した後の外観上及び耐久性上の問題に対応するために、本発明においては、鉄筋コンクリート製ビーム部材１４の外周面を化粧層２２で被覆している。   The reinforcing bar amount of the main reinforcing bar 18 of the reinforced concrete beam member 14 is set so that the tensile reinforcing bar ratio pt is within the range of 0.005 to 0.030. This amount of reinforcing bars is the amount of reinforcing bars that can guarantee that even if cracks occur in the beam member 14 made of reinforced concrete, the rigidity of the beam member 14 does not greatly decrease and that it functions sufficiently as a stiffener. It is not guaranteed to prevent the beam member 14 from cracking. In the present invention, more importance is attached to making the thickness and weight of the stiffener as small as possible than preventing the stiffener from cracking. In order to address the problems in appearance and durability after cracks are generated in the reinforced concrete beam member 14 which is a stiffener, and particularly in the outer peripheral surface thereof, in the present invention, the reinforced concrete beam member is used. The outer peripheral surface of 14 is covered with a decorative layer 22.

化粧層２２は、鉄筋コンクリート製ビーム部材１４の外周面に塗装により形成され、鉄筋コンクリート製ビーム部材１４の外周面にひび割れが発生したときに弾性伸展し得る弾性塗膜から成るものとするとよい。このような弾性被膜は、鉄筋コンクリート製ビーム部材１４の外周面に発生したひび割れを良好に隠蔽することができ、しかもこのような化粧層２２は低コストで形成することができる。また、その弾性塗膜は防水性被膜とすれば更に好ましく、そうすることで、座屈拘束ブレース１０の耐久性を更に向上させることができる。   The decorative layer 22 is preferably formed of an elastic coating film that is formed on the outer peripheral surface of the reinforced concrete beam member 14 and that can elastically extend when cracks occur on the outer peripheral surface of the reinforced concrete beam member 14. Such an elastic coating can well conceal cracks generated on the outer peripheral surface of the reinforced concrete beam member 14, and such a decorative layer 22 can be formed at low cost. Further, the elastic coating film is more preferably a waterproof coating, and by doing so, the durability of the buckling restrained brace 10 can be further improved.

また、化粧層２２を上述したような弾性被膜から成るものとする場合には、鉄筋コンクリート製ビーム部材１４の外周面に、帯筋２０と平行に延在する目地２４を形成するとよい。このような目地２４を形成することによって、鉄筋コンクリート製ビーム部材１４の外周面に発生するひび割れをその目地２４の内部に集めることができるため、ひび割れを隠蔽する効果が更に高まる。   When the decorative layer 22 is made of the elastic film as described above, a joint 24 extending in parallel with the band 20 may be formed on the outer peripheral surface of the reinforced concrete beam member 14. By forming such joints 24, the cracks generated on the outer peripheral surface of the reinforced concrete beam member 14 can be collected inside the joints 24, thereby further enhancing the effect of concealing the cracks.

別法として、化粧層２２を、鉄筋コンクリート製ビーム部材１４の外周面に巻付けられた、例えば薄い鉄板や繊維強化プラスチック板などの化粧薄板から成るものとするのもよい。このような化粧薄板は見映えがするため、それによって座屈拘束ブレース１０の外観性を更に高めることができる。  Alternatively, the decorative layer 22 may be made of a decorative thin plate such as a thin iron plate or a fiber reinforced plastic plate wound around the outer peripheral surface of the reinforced concrete beam member 14. Since such a decorative thin plate looks, the appearance of the buckling restrained brace 10 can be further enhanced thereby.

また、鉄筋コンクリート製ビーム部材１４にプレストレスト・コンクリート鋼線（ＰＣ鋼線）を装備するのもよい。その場合には、複数のＰＣ鋼線を鉄筋コンクリート製ビーム部材１４の長手方向に延在させ、それらＰＣ鋼線によって、鉄筋コンクリート製ビーム部材１４の長手方向に圧縮荷重を導入することで、補剛材である鉄筋コンクリート製ビーム部材１４を更に細身で軽量のものとすることができる。これによって本発明の効果が更に強化される。   Further, the reinforced concrete beam member 14 may be equipped with a prestressed concrete steel wire (PC steel wire). In that case, a plurality of PC steel wires are extended in the longitudinal direction of the reinforced concrete beam member 14, and a compressive load is introduced into the longitudinal direction of the reinforced concrete beam member 14 by the PC steel wires, thereby providing a stiffener. The reinforced concrete beam member 14 can be made thinner and lighter. This further enhances the effect of the present invention.

図２は本発明の第２の実施の形態に係る座屈拘束ブレース３０の横断面図であり、図３は本発明の第３の実施の形態に係る座屈拘束ブレース５０の横断面図である。これら座屈拘束ブレース３０、５０は、図１に示した座屈拘束ブレース１０のブレース芯材１２とは横断面形状の異なるブレース芯材３２、５２を備えている。その他の点については、これら座屈拘束ブレース３０、５０は図１の座屈拘束ブレース１０と同じ構造を有しており、夫々が鉄筋コンクリート製ビーム部材３４、５４から成る補剛材を備え、それら鉄筋コンクリート製ビーム部材３４、５４は、複数本の主筋３８、５８とそれら主筋３８、５８の周囲を囲繞する帯筋４０、６０とを備えている。   FIG. 2 is a transverse sectional view of a buckling restrained brace 30 according to the second embodiment of the present invention, and FIG. 3 is a transverse sectional view of a buckling restrained brace 50 according to the third embodiment of the present invention. is there. These buckling restraint braces 30, 50 are provided with brace core members 32, 52 having a different cross-sectional shape from the brace core member 12 of the buckling restraint brace 10 shown in FIG. In other respects, these buckling constraining braces 30, 50 have the same structure as the buckling constraining brace 10 of FIG. 1, and each includes stiffeners made of reinforced concrete beam members 34, 54, and The reinforced concrete beam members 34 and 54 include a plurality of main bars 38 and 58 and band bars 40 and 60 surrounding the main bars 38 and 58.

図２及び図３の座屈拘束ブレース３０、５０のブレース芯材３２、５２は、一定の厚さ及び幅を有する平鋼板の形状の鋼材から成り、図２の実施の形態ではそのような１本の鋼材でブレース芯材３２を構成している。図３の実施の形態ではそのような鋼材を２本並設してそれら鋼材の両端においてそれら鋼材を結合してブレース芯材５２を構成している。ブレース芯材３２、５２は、横断面形状が扁平であるため、厚さ方向に局部座屈を生じようとする傾向を有している。そこで、それらブレース芯材３２、５２の局部座屈を防止するために、帯筋４０、６０のピッチをブレース芯材の厚さの１０倍以下のピッチとし、また、帯筋４０、６０の鉄筋量を、それら帯筋４０、６０がブレース芯材３２、４２の降伏軸力×０．０２以上の引張力を負担し得る鉄筋量としており、それら帯筋４０、６０によって局部座屈を防止するようにしている。また更に、帯筋４０、６０によってブレース芯材３２、４２の局部座屈を防止するためには鉄筋コンクリート製ビーム部材３４、５４が少なくとも２組の帯筋群を備えているようにすることが好ましい。   The brace core members 32 and 52 of the buckling-restrained braces 30 and 50 shown in FIGS. 2 and 3 are made of a steel material in the form of a flat steel plate having a certain thickness and width. In the embodiment shown in FIG. The brace core material 32 is composed of a steel material. In the embodiment of FIG. 3, two such steel materials are arranged side by side, and the steel materials are joined at both ends of the steel materials to constitute the brace core material 52. Since the cross-sectional shape is flat, the brace core materials 32 and 52 have a tendency to cause local buckling in the thickness direction. Therefore, in order to prevent local buckling of the brace core materials 32 and 52, the pitch of the strips 40 and 60 is set to a pitch not more than 10 times the thickness of the brace core material. The amount of the reinforcing bars 40 and 60 is the amount of reinforcing bars that can bear the tensile force of the yield axial force of the brace cores 32 and 42 x 0.02 or more, and the local reinforcing bars 40 and 60 prevent local buckling. I am doing so. Still further, in order to prevent local buckling of the brace core members 32 and 42 by the straps 40 and 60, it is preferable that the reinforced concrete beam members 34 and 54 have at least two sets of straps. .

また、図２及び図３の座屈拘束ブレース３０、５０では、ブレース芯材３２、５２の横断面形状が比較的単純であることから、ブレース芯材３２、５２と鉄筋コンクリート製ビーム部材３４、５４とをアンボンド状態とする手段として、ブレース芯材３４、４４の表面にアンボンド剤を塗布する替わりに、ブレース芯材３４、５４の周囲に薄い鋼板を巻付け、その鋼板とブレース芯材３４、５４とが相対的に摺動することでブレース芯材３２、５２と鉄筋コンクリート製ビーム部材３４、５４とがアンボンド状態となるようにするのもよい。   Further, in the buckling restrained braces 30 and 50 shown in FIGS. 2 and 3, since the cross-sectional shape of the brace core members 32 and 52 is relatively simple, the brace core members 32 and 52 and the reinforced concrete beam members 34 and 54 are used. As a means for unbonding, instead of applying an unbonding agent to the surfaces of the brace core members 34 and 44, a thin steel plate is wound around the brace core members 34 and 54, and the steel plate and the brace core members 34 and 54 are wound. And the brace core members 32 and 52 and the reinforced concrete beam members 34 and 54 may be in an unbonded state.

以上の説明から明らかなように、本発明に係る座屈拘束ブレースによれば、比較的低コストで製作することのできる鉄筋コンクリート製の補剛材を、従来のものと比べてより細身で軽量にすることができ、そのため本発明に係る座屈拘束ブレースはより広範に利用することが可能である。   As is clear from the above description, according to the buckling restrained brace according to the present invention, a reinforced concrete stiffener that can be manufactured at a relatively low cost is made thinner and lighter than conventional ones. Therefore, the buckling restrained brace according to the present invention can be used more widely.

１０ 座屈拘束ブレース
１２ ブレース芯材
１４ 鉄筋コンクリート製ビーム部材（補剛材）
１８ 主筋
２０ 帯筋
２２ 化粧層
２４ 目地
３０ 座屈拘束ブレース
３２ ブレース芯材
３４ 鉄筋コンクリート製ビーム部材（補剛材）
３８ 主筋
４０ 帯筋
５０ 座屈拘束ブレース
５２ ブレース芯材
５４ 鉄筋コンクリート製ビーム部材（補剛材）
５８ 主筋
６０ 帯筋 10 Buckling restraint brace 12 Brace core 14 Reinforced concrete beam member (stiffener)
18 Main reinforcement 20 Belt reinforcement 22 Makeup layer 24 Joint 30 Buckling restraint brace 32 Brace core 34 Reinforced concrete beam member (stiffening material)
38 Main bar 40 Band bar 50 Buckling restraint brace 52 Brace core material 54 Reinforced concrete beam member (stiffener)
58 main muscle 60

Claims (9)

座屈拘束ブレースにおいて、
長手方向の圧縮荷重及び引張荷重を受けて伸縮するように塑性変形する鋼材から成るブレース芯材と、長手方向の圧縮荷重を受けた前記ブレース芯材が座屈するのを防止するべく前記ブレース芯材を補剛する座屈拘束用の補剛材とを備え、
前記補剛材は、前記ブレース芯材に対してアンボンド状態で前記ブレース芯材の周囲を囲繞して前記ブレース芯材と平行に延在する鉄筋コンクリート製ビーム部材から成り、該鉄筋コンクリート製ビーム部材は、該鉄筋コンクリート製ビーム部材の長手方向に延在する複数本の主筋とそれら主筋の周囲を囲繞する帯筋とを備えており、
前記主筋の鉄筋量は引張鉄筋比ｐｔが０．００５〜０．０３０の範囲内となる鉄筋量であり、
前記鉄筋コンクリート製ビーム部材の外周面は化粧層で被覆されている、
ことを特徴とする座屈拘束ブレース。 In buckling restraint braces,
A brace core material made of a steel material that undergoes plastic deformation so as to expand and contract in response to a longitudinal compressive load and a tensile load, and the brace core material to prevent buckling of the brace core material subjected to the longitudinal compressive load. And a stiffening material for buckling restraint that stiffens
The stiffener comprises a reinforced concrete beam member that surrounds the periphery of the brace core material in an unbonded state with respect to the brace core material and extends in parallel with the brace core material. A plurality of main reinforcing bars extending in the longitudinal direction of the reinforced concrete beam member, and strips surrounding the main reinforcing bars;
The reinforcing bar amount of the main reinforcing bar is the reinforcing bar amount in which the tensile reinforcing bar ratio pt is in the range of 0.005 to 0.030,
The outer peripheral surface of the reinforced concrete beam member is covered with a decorative layer,
A buckling restrained brace characterized by that. 前記化粧層は、前記鉄筋コンクリート製ビーム部材の外周面に塗装により形成され、前記鉄筋コンクリート製ビーム部材の外周面にひび割れが発生したときに弾性伸展し得る弾性塗膜から成ることを特徴とする請求項１記載の座屈拘束ブレース。   The said decorative layer is formed of an outer peripheral surface of the reinforced concrete beam member by coating, and is made of an elastic coating film that can be elastically extended when a crack occurs on the outer peripheral surface of the reinforced concrete beam member. The buckling restraint brace according to 1. 前記弾性塗膜は防水性塗膜であることを特徴とする請求項２記載の座屈拘束ブレース。   The buckling restrained brace according to claim 2, wherein the elastic coating film is a waterproof coating film. 前記鉄筋コンクリート製ビーム部材は、その外周面に前記帯筋と平行に延在する目地が形成されていることを特徴とする請求項２記載の座屈拘束ブレース。   The buckling-restrained brace according to claim 2, wherein the reinforced concrete beam member has a joint formed on an outer peripheral surface thereof in parallel with the band. 前記化粧層は、前記鉄筋コンクリート製ビーム部材の外周面に巻かれた化粧薄板から成ることを特徴とする請求項１記載の座屈拘束ブレース。   The buckling-restraining brace according to claim 1, wherein the decorative layer is made of a decorative thin plate wound around an outer peripheral surface of the reinforced concrete beam member. 前記ビーム芯材は横断面形状が十字形の鋼材から成ることを特徴とする請求項１記載の座屈拘束ブレース。   The buckling-restraining brace according to claim 1, wherein the beam core is made of a steel material having a cross-shaped cross section. 前記ビーム芯材は一定の厚さ及び幅を有する平鋼板の形状の鋼材から成り、前記帯筋のピッチは前記平鋼板の厚さの１０倍以下のピッチであり、前記帯筋の鉄筋量は、該帯筋が前記ブレース芯材の降伏軸力×０．０２以上の引張力を負担し得る鉄筋量であることを特徴とする請求項１記載の座屈拘束ブレース。   The beam core material is made of a steel material in the form of a flat steel plate having a constant thickness and width, and the pitch of the strip is not more than 10 times the thickness of the flat steel plate. 2. The buckling-restrained brace according to claim 1, wherein the band reinforcement has a reinforcing bar amount capable of bearing a tensile force of yield strength x 0.02 or more of the brace core material. 前記ブレース芯材の周囲に薄い鋼板が巻付けられており、該鋼板と前記ブレース芯材とが相対的に摺動することで前記ブレース芯材と前記鉄筋コンクリート製ビーム部材とがアンボンド状態とされていることを特徴とする請求項７記載の座屈拘束ブレース。   A thin steel plate is wound around the brace core material, and the brace core material and the reinforced concrete beam member are unbonded by relatively sliding the steel plate and the brace core material. The buckling restrained brace according to claim 7, wherein 前記鉄筋コンクリート製ビーム部材は、該鉄筋コンクリート製ビーム部材の長手方向に圧縮荷重を導入するプレストレスト・コンクリート鋼線を備えていることを特徴とする請求項１記載の座屈拘束ブレース。   The buckling-restrained brace according to claim 1, wherein the reinforced concrete beam member includes a prestressed concrete steel wire that introduces a compressive load in a longitudinal direction of the reinforced concrete beam member.
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CN102605874A (en) * 2012-04-06 2012-07-25 北京工业大学 Steel and recycled concrete combined energy dissipation brace and manufacturing method thereof
CN110284655A (en) * 2019-07-02 2019-09-27 中冶建筑研究总院有限公司 Steel column can be restored using the prestressing force that clamping hoop type round tube constrains

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JPH0430046A (en) * 1990-05-25 1992-02-03 Shimizu Corp Earthquake-proof reinforced k-type brace
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* Cited by examiner, † Cited by third party
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CN102605874A (en) * 2012-04-06 2012-07-25 北京工业大学 Steel and recycled concrete combined energy dissipation brace and manufacturing method thereof
CN110284655A (en) * 2019-07-02 2019-09-27 中冶建筑研究总院有限公司 Steel column can be restored using the prestressing force that clamping hoop type round tube constrains

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