JPH1144120A - Earthquake damping core wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake damping core wall to exhibit earthquake resistant performance by forming a corner part, an opening end part and a wall intermediate part of the core wall such as a periphery of an elevator room out of a steel frame enclosing concrete wall, and horizontally joining adjacent mutual boundaries by extremely low yielding point steel. SOLUTION: A core wall 1 such as a periphery of an elevator and a stairs room of a building is constructed as an earthquake resistant wall. The core wall 1 is joined by a boundary beam 6 by juxtaposing plural concrete earthquake resistant walls by respectively interposing an opening 5. The respective concrete earthquake resistant walls are formed of a steel frame enclosing concrete wall by enclosing a steel frame by an ordinary steel material in a corner part, an opening end part and a wall intermediate part or the like of the core wall 1 as vertical directional bending reinforcing steel 7. The boundary beam 6 is integrally joined with a bending reinforcing steel material by using extremely low yielding point steel. The concrete earthquake resistant walls rotate as a rigid body when horizontal force is applied, and the boundary beam 6 is plasticized in its early stages by receiving shearing deformation, and exhibits large energy absorbing capacity. Therefore, a wall thickness of the core wall is reduced, and a building frame work cost can be reduced.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明が属する技術分野】この発明は、建物のエレベー
タ、階段室、設備室廻り等のコア壁に水平力（地震力）
の大部分を負担させる構造形式の建物の技術分野に属
し、小地震から大地震まで広範囲に、大きなエネルギー
吸収能力を発揮する、特に鉄骨内蔵コンクリート壁によ
る制震コア壁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal force (seismic force) applied to a core wall around an elevator, a staircase, a facility room, etc. of a building.
The present invention belongs to the technical field of structural type buildings that bear most of the above, and exhibits a large energy absorption capacity in a wide range from small earthquakes to large earthquakes, and particularly relates to a seismic control core wall with a steel built-in concrete wall.

【０００２】[0002]

【従来の技術】建物内部のコア壁を鉄筋コンクリート造
（以下、ＲＣ造という。）とし、外周フレームを鉄骨造
とする混合構造物の研究が盛んである。しかし、コア壁
に水平力の大部分を負担させるため、従来の耐震設計
（地震力などの水平力に対する強度設計）ではコア壁が
大きな壁厚となり、大量の鉄筋が必要な構造となり、壁
筋が密に配筋されるので、施工性が低下し、躯体工事費
用が増大する、などの問題がある。2. Description of the Related Art Research is being actively conducted on mixed structures in which a core wall inside a building is made of reinforced concrete (hereinafter referred to as RC) and an outer frame is made of steel. However, the conventional seismic design (strength design against horizontal force such as seismic force) requires a large wall thickness and a structure requiring a large amount of rebar, because the core wall bears most of the horizontal force. However, there is a problem that the workability is reduced and the frame construction cost is increased because the reinforcing bars are densely arranged.

【０００３】特開平５ー９８７０３号公報には、建物の
コア壁の角部、開口部端の鉄筋の一部を鉄骨に置き換
え、開口を仲介にして隣合い並立するコンクリート壁同
士を境界梁で連結した鉄骨内蔵コンクリート壁の構成が
開示されている。一方、ＲＣ造コア壁の開口において
は、ＲＣ造境界梁が、両側に隣合い並立する耐震壁を連
結することになるが、この境界梁は一般的にスパン長の
小さい所謂短スパン梁となり、大きなせん断力とせん断
変形を受けるため、大量の梁主筋とせん断補強筋を必要
とし、場合によってはＸ形筋が必要になるなど、鉄筋組
み立て作業が極めて困難なものとなる。[0003] Japanese Patent Application Laid-Open No. 5-98703 discloses that a corner of a core wall of a building and a part of a reinforcing bar at an end of an opening are replaced with a steel frame, and concrete walls which are adjacent to each other side by side with an opening as a boundary beam. A configuration of a connected steel framed concrete wall is disclosed. On the other hand, in the opening of the RC structure core wall, the RC structure boundary beam connects the seismic walls adjacent to each other side by side, and this boundary beam is generally a so-called short span beam having a small span length. Since a large shear force and shear deformation are applied, a large amount of beam main reinforcement and shear reinforcement are required, and in some cases, an X-shaped reinforcement is required.

【０００４】[0004]

【本発明が解決しようとする課題】従って、本発明の目
的は、コア壁を、ＲＣ造壁に比して大きな変形性能を有
する鉄骨内蔵コンクリート壁として構成し、また、短ス
パン梁となり、且つ並立する耐震壁の剛体回転（図３参
照）により大きなせん断力、せん断変形を受ける境界梁
に大きなエネルギー吸収能力を持たせて耐震性能を発揮
させる制震コア壁を提供することである。因みに、この
ような鉄骨内蔵コンクリート壁は、従来のＲＣ造壁に比
して大きな変形性能を有することは、既に実験の結果と
して知得されている（例えば日本建築学会大会学術講演
梗概集、（近畿）１９９６年９月）。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to configure a core wall as a concrete wall with a built-in steel frame having a large deformation performance as compared with a RC wall, a short span beam, and It is an object of the present invention to provide a seismic control core wall in which a boundary beam subjected to a large shear force and shear deformation has a large energy absorbing ability due to a rigid rotation of the shear walls (see FIG. 3). Incidentally, it is already known as a result of an experiment that such a steel frame built-in concrete wall has a large deformation performance as compared with a conventional RC wall (for example, Abstracts of the Technical Meeting of the Architectural Institute of Japan, ( Kinki) September 1996).

【０００５】[0005]

【課題を解決するための手段】上記の課題を解決するた
めの手段として、請求項１記載の発明に係る制震コア壁
は、建物のエレベータ、階段室、設備室廻り等のコア壁
において、コア壁を、その隅角部、開口部端及び壁中間
部に普通鋼材の鉄骨を内蔵させ鉄骨内蔵コンクリート壁
として構成すると共に、開口を仲介にして隣合い並立す
る鉄骨内蔵コンクリート壁相互の境界を極低降伏点鋼に
よる境界梁で水平に接合して成ることを特徴とする。Means for Solving the Problems As means for solving the above-mentioned problems, the damping core wall according to the first aspect of the present invention is used in a core wall around an elevator, a staircase, a facility room, or the like of a building. The core wall is constructed as a steel frame built-in concrete wall with a steel frame of ordinary steel built therein at the corner, opening end, and the middle of the wall, and the boundaries between the adjacent steel frame built-in concrete walls are arranged side by side through the opening. It is characterized by being horizontally joined by boundary beams made of extremely low yield point steel.

【０００６】請求項２記載の発明は、請求項１記載の鉄
骨内蔵コンクリート壁に、開口部端に沿って上下方向に
普通鋼材による曲げ補強鋼が内蔵され、境界梁は前記の
曲げ補強鋼と接合されていることを特徴とする。請求項
３記載の発明は、請求項２記載の鉄骨内蔵コンクリート
壁に上下方向に内蔵された普通鋼材による曲げ補強鋼の
脚部に、極低降伏点鋼が一体的構造に配置されているこ
とを特徴とする。According to a second aspect of the present invention, in the concrete wall with a built-in steel frame according to the first aspect, a bending reinforcing steel made of a normal steel material is incorporated in a vertical direction along an opening end, and a boundary beam is formed of the bending reinforcing steel. It is characterized by being joined. According to a third aspect of the present invention, an extremely low yield point steel is disposed in an integrated structure on a leg portion of a bending reinforced steel made of a normal steel material which is vertically embedded in a concrete wall with a built-in steel frame according to the second aspect. It is characterized by.

【０００７】請求項４記載の発明は、請求項１又は２記
載の境界梁に沿ってダンパー機構が設置されていること
を特徴とする。According to a fourth aspect of the present invention, a damper mechanism is provided along the boundary beam according to the first or second aspect.

【０００８】[0008]

【発明の実施形態】請求項１記載の発明に係る制震コア
壁は、図１に例示したように、建物のエレベータ、階段
室、設備室廻り等のコア壁１を、地震等の水平力の大部
分を負担させる耐震壁として構築し、外周フレーム２を
鉄骨造とする混合構造物に好適に実施される。図１中の
符号３は大スパン鉄骨梁である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a vibration damping core wall according to the first aspect of the present invention is constructed such that a core wall 1 around an elevator, a staircase room, a facility room, etc. of a building is subjected to a horizontal force such as an earthquake. This is preferably implemented for a mixed structure constructed as an earthquake-resistant wall that bears most of the above, and the outer frame 2 is made of steel. Reference numeral 3 in FIG. 1 is a large span steel beam.

【０００９】前記コア壁１の構造概要は、図２及び図３
に示したように、平面的に見ると角筒を形成する複数の
コンクリート耐震壁４…が、それぞれ開口５を仲介にし
て隣合い（又は開口５を隔てて）並立し、これら並立す
る耐震壁４、４相互の境界を、開口５を渡る水平な境界
梁６で接合した構成とされている。しかも各コンクリー
ト耐震壁４は、図２或いは図４に示したように、コア壁
１の隅角部、開口部端及び壁中間部などに、普通鋼材に
よる鉄骨を、上下方向の曲げ補強鋼７及び水平方向の繋
ぎ梁８として内蔵させ、更にひび割れの分散を目的とし
た細径のメッシュ筋９を配筋した構造形式の鉄骨内蔵コ
ンクリート壁として構成されている。そして、各層の境
界梁６には、降伏点強度が低い、所謂極低降伏点鋼を使
用し、これを前記の曲げ補強鋼７と一体的に接合した構
成とされている。因みに境界梁６の構造形式は、図５Ａ
に例示したように、当該梁の全断面を極低降伏点鋼で作
る場合と、図５Ｂに例示したようにフランジを例えばＳ
Ｍ４９Ｄのような普通鋼材で作り、ウエブを極低降伏点
鋼で作り、ウエブのせん断降伏によるエネルギー吸収に
期待する場合とがある。The outline of the structure of the core wall 1 is shown in FIGS.
As shown in FIG. 2, a plurality of concrete earthquake-resistant walls 4 forming a rectangular tube when viewed in a plane are adjacent to each other (or across the opening 5) with the opening 5 interposed therebetween. The boundary between the four and the four is joined by a horizontal boundary beam 6 that crosses the opening 5. In addition, as shown in FIG. 2 or FIG. 4, each concrete earthquake-resistant wall 4 is provided with a steel frame made of ordinary steel at the corners, opening ends, and intermediate portions of the core wall 1, and vertically bent reinforcing steel 7. And, it is built in as a connecting beam 8 in the horizontal direction, and furthermore, it is configured as a steel wall with a built-in concrete structure having a structure in which small-diameter mesh bars 9 are arranged for the purpose of dispersing cracks. For the boundary beam 6 of each layer, a so-called extremely low yield point steel having a low yield point strength is used, and this is integrally joined to the bending reinforcing steel 7. Incidentally, the structural form of the boundary beam 6 is shown in FIG.
As shown in FIG. 5B, when the entire cross section of the beam is made of a very low yield point steel, and as shown in FIG.
In some cases, the web is made of a very low yield point steel, such as M49D, and the web is expected to absorb energy by shear yielding of the web.

【００１０】上記構成のコンクリート耐震壁４は、水平
力を受けると、図６に示したように剛体回転し、境界梁
６は大きなせん断変形を受ける。その境界梁６が極低降
伏点鋼で作られているため、小地震や強風時の水平力、
或いは大地震の水平力まで、あらゆる状況に応じて境界
梁６の塑性化が早期に発生し、同梁の履歴エネルギー吸
収により大きなエネルギー吸収能力を発揮するので、こ
のコア壁１は制震コア壁となる。コア壁１は、鉄骨内蔵
コンクリート壁でもあるから、壁厚を小さくでき、鋼材
量も少なくしても、従来のＲＣ造コア壁と同等以上の耐
震性能を発揮するものとなる。When the concrete earthquake-resistant wall 4 having the above structure receives a horizontal force, it rotates rigidly as shown in FIG. 6, and the boundary beam 6 undergoes a large shear deformation. Because the boundary beam 6 is made of extremely low yield point steel, the horizontal force during small earthquakes and strong winds,
Alternatively, until the horizontal force of a large earthquake, plasticization of the boundary beam 6 occurs at an early stage depending on various situations, and the beam has a large energy absorbing ability due to the hysteretic energy absorption of the beam, so that the core wall 1 is a seismic control core wall. Becomes Since the core wall 1 is also a concrete wall with a built-in steel frame, the wall thickness can be reduced, and even if the amount of steel material is reduced, the core wall 1 exhibits seismic performance equal to or higher than that of the conventional RC core wall.

【００１１】上述したように大きなせん断変形を受ける
境界梁６の力学状況に着眼すると、この境界梁６の長手
方向に沿ってダンパー機構（図示は省略した）を付設す
ると、エネルギー吸収総量が一層大きな制震コア壁とし
て実施することができる（請求項４の発明）。また、図
６に示したコンクリート耐震壁（鉄骨内蔵コンクリート
壁）４の剛体回転に着眼すると、同コンクリート耐震壁
４に内蔵された上下方向の曲げ補強鋼７の脚部に極低降
伏点鋼１０を設置すると、前記の回転変位に伴ってこの
極低降伏点鋼１０の塑性化が早期に発生し、同鋼材の履
歴エネルギー吸収により大きなエネルギー吸収能力を発
揮して、やはり制震コア壁の性能が向上する（請求項３
記載の発明）。When focusing on the mechanical condition of the boundary beam 6 subjected to a large shear deformation as described above, if a damper mechanism (not shown) is provided along the longitudinal direction of the boundary beam 6, the total energy absorption is further increased. It can be implemented as a vibration control core wall (the invention of claim 4). When focusing on the rigid rotation of the concrete shear wall (concrete wall with a built-in steel frame) 4 shown in FIG. 6, the extremely low yield point steel 10 When the steel is installed, the plasticization of the extremely low yield point steel 10 occurs at an early stage due to the rotational displacement described above, and the steel material exhibits a large energy absorbing ability due to the hysteretic energy absorption. Is improved (claim 3
Described invention).

【００１２】[0012]

【本発明が奏する効果】本発明に係る制震コア壁は、小
地震から大地震までの広範囲において大きなエネルギー
吸収能力を発揮して優れた制震性を期待できるほか、コ
ア壁の壁厚の縮小化、鉄筋組み立ての面倒さを解決し
て、躯体工事費の低減、内部有効居住面積の増大などに
寄与するのである。[Effects of the present invention] The vibration-damping core wall according to the present invention exerts a large energy absorption capacity over a wide range from a small earthquake to a large earthquake, and can be expected to have excellent vibration-damping properties. By reducing the size and the trouble of assembling the rebar, it contributes to the reduction of the frame construction cost and the increase of the internal effective living area.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の制震コア壁を採用した建物の概略図で
ある。FIG. 1 is a schematic view of a building employing a damping core wall of the present invention.

【図２】本発明の制震コア壁の立面図である。FIG. 2 is an elevation view of a vibration damping core wall according to the present invention.

【図３】本発明の制震コア壁の平面図である。FIG. 3 is a plan view of a damping core wall according to the present invention.

【図４】鉄骨内蔵コンクリート壁の断面図である。FIG. 4 is a sectional view of a concrete wall with a built-in steel frame.

【図５】Ａ，Ｂは境界梁の断面図である。5A and 5B are cross-sectional views of a boundary beam.

【図６】耐震壁の剛体回転の説明図である。FIG. 6 is an explanatory view of rigid rotation of a shear wall.

【符号の説明】[Explanation of symbols]

１ コア壁 ５ 開口 ４ コンクリート耐震壁 ７ 曲げ補強鋼 ８ 繋ぎ梁 ６ 境界梁 １０ 極低降伏点鋼 DESCRIPTION OF SYMBOLS 1 Core wall 5 Opening 4 Concrete shear wall 7 Bending steel 8 Connecting beam 6 Boundary beam 10 Extremely low yield point steel

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 建物のエレベータ、階段室、設備室廻り
等のコア壁において、 コア壁を、その隅角部、開口部端及び壁中間部に普通鋼
材の鉄骨を内蔵させ鉄骨内蔵コンクリート壁として構成
すると共に、開口を仲介にして隣合い並立する鉄骨内蔵
コンクリート壁相互の境界を極低降伏点鋼による境界梁
で水平に接合して成ることを特徴とする制震コア壁。1. A core wall for an elevator, a staircase, a facility room, or the like around a building, wherein the core wall is a concrete wall with a built-in steel frame in which a steel frame of ordinary steel is built in the corner, opening end, and middle of the wall. A seismic control core wall which is constructed, and wherein the boundaries between adjacent steel-concrete built-in concrete walls which are adjacent to each other via an opening are horizontally joined by boundary beams made of extremely low yield point steel. 【請求項２】 請求項１記載の鉄骨内蔵コンクリート壁
には、開口部端に沿って上下方向に普通鋼材による曲げ
補強鋼が内蔵され、境界梁は前記の曲げ補強鋼と接合さ
れていることを特徴とする制震コア壁。2. The steel frame with a built-in steel frame according to claim 1, wherein a bending reinforcing steel made of a normal steel material is built in a vertical direction along an end of the opening, and a boundary beam is joined to the bending reinforcing steel. Characterized by a damping core wall. 【請求項３】 請求項２記載の鉄骨内蔵コンクリート壁
に上下方向に内蔵された普通鋼材による曲げ補強鋼の脚
部に、極低降伏点鋼が一体的構造に配置されていること
を特徴とする制震コア壁。3. An extremely low yield point steel is disposed in an integrated structure on a leg portion of a bending steel reinforced with a normal steel material which is vertically embedded in a concrete wall with a built-in steel frame according to claim 2. Damping core wall. 【請求項４】 請求項１又は２記載の境界梁に沿ってダ
ンパー機構が設置されていることを特徴とする制震コア
壁。4. A damping core wall provided with a damper mechanism along the boundary beam according to claim 1 or 2.