JP3018967B2 - Reinforcement method for reinforced concrete columns - Google Patents
Reinforcement method for reinforced concrete columnsInfo
- Publication number
- JP3018967B2 JP3018967B2 JP7314203A JP31420395A JP3018967B2 JP 3018967 B2 JP3018967 B2 JP 3018967B2 JP 7314203 A JP7314203 A JP 7314203A JP 31420395 A JP31420395 A JP 31420395A JP 3018967 B2 JP3018967 B2 JP 3018967B2
- Authority
- JP
- Japan
- Prior art keywords
- reinforced concrete
- column
- reinforcing
- concrete column
- reinforced
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off
Landscapes
- Rod-Shaped Construction Members (AREA)
- Working Measures On Existing Buildindgs (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、鉄筋コンクリー
ト構造物における、主に既存の鉄筋コンクリート柱（以
下、「柱」という）の剪断耐力と曲げ耐力とを補強する
鉄筋コンクリート柱の補強方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a reinforced concrete column mainly for reinforcing an existing reinforced concrete column (hereinafter referred to as a "column") in a reinforced concrete structure.
【０００２】[0002]
【従来の技術】最近の内外の大地震により鉄筋コンクリ
ートの建物は、大きな被害を受けたが、その被害の原因
として柱の剪断破壊が第一に指摘されている。そして、
その剪断破壊を増長する原因は強震時での多数回交番繰
り返し変形であることが究明されている。一方、このよ
うな繰り返し力に対して柱が剪断破壊するのを防止し、
復元力特性の安定と粘りを確保するには、主筋によって
囲まれている部分のコンクリート（コアコンクリート）
を有効に拘束することが最適であることが最近の研究で
解明されている。2. Description of the Related Art Reinforced concrete buildings have been seriously damaged by recent large-scale earthquakes inside and outside Japan, and shear damage of columns has been pointed out first as a cause of the damage. And
It has been determined that the cause of the increase in shear rupture is a large number of alternating deformations during strong earthquakes. On the other hand, to prevent the column from shearing and breaking against such a repeated force,
To ensure the stability and the tenacity of the restoring force characteristics, the concrete (core concrete) surrounded by the main reinforcement
Recent studies have shown that it is optimal to effectively bind.
【０００３】そしてこのような考えに基いて、既存の柱
の外周に鋼板や繊維補強シートを巻き付けて柱の剪断力
を高める方法が既に実施されている。[0003] Based on this idea, a method of winding a steel plate or a fiber reinforced sheet around the outer periphery of an existing column to increase the shearing force of the column has already been implemented.
【０００４】しかし、既存の柱には、剪断耐力のみなら
ず、曲げ耐力も不足している場合が多く、曲げ耐力と剪
断耐力の同時補強が必要なときもある。[0004] However, existing columns often lack not only the shear strength but also the bending strength, and sometimes simultaneous reinforcement of the bending strength and the shear strength is necessary.
【０００５】また、たれ壁や腰壁を有する柱の場合、柱
の有効高さが小さくなるために、剪断破壊が著しいが、
単に剪断補強するだけでは耐力増強にはならず、曲げ耐
力も高めておく必要が生じる。[0005] In the case of a pillar having a back wall or a waist wall, the effective height of the pillar is reduced, so that shear failure is remarkable.
Simply strengthening by shearing does not increase the proof strength, but also needs to increase the bending proof strength.
【０００６】さらに、旧耐震基準に基づく設計では、最
近の内外の大地震に対して不充分であることが明らかに
なり、耐震基準の見直しがなされているが、それでも旧
耐震基準に基いて設計された鉄筋コンクリート建物は未
だ数多く現存するため、これらの建物の柱を効率的に補
強する必要があった。Further, it has been found that the design based on the old seismic standards is insufficient for recent large-scale earthquakes inside and outside the country, and the seismic standards have been revised. Nevertheless, the designs based on the old seismic standards still exist. Since many reinforced concrete buildings still exist, it was necessary to efficiently reinforce the pillars of these buildings.
【０００７】この発明は、以上の要望に応えてなされた
もので、鉄筋コンクリート柱の剪断耐力および曲げ耐力
を容易に高められるようにした鉄筋コンクリート柱の補
強方法を提供することを目的とする。The present invention has been made in response to the above-mentioned demands, and has as its object to provide a method of reinforcing a reinforced concrete column capable of easily increasing the shear strength and the bending strength of the reinforced concrete column.
【０００８】[0008]
【課題を解決するための手段】この発明に係る請求項第
１項記載の鉄筋コンクリ柱の補強方法は、柱頭部と柱脚
部にそれぞれ下がり壁と腰壁を接合した鉄筋コンクリー
ト柱に複数本の補強線材を、その上、下端部をそれぞれ
下がり壁と腰壁に達するように軸芯方向に連続して取り
付け、かつ、前記鉄筋コンクリート柱に高強力繊維補強
シートを巻き付けることを特徴とする。According to a first aspect of the present invention, there is provided a method for reinforcing a reinforced concrete column, wherein a plurality of reinforced concrete columns are formed by joining a lower wall and a lumbar wall to a column head and a column base, respectively. The reinforcing wire is attached continuously in the axial direction so that the upper and lower ends thereof respectively reach the lower wall and the waist wall, and a high-strength fiber reinforced sheet is wound around the reinforced concrete column.
【０００９】この発明に係る請求項２記載のコンクリー
ト柱の補強方法は、前項において、補強線材は鉄筋コン
クリート柱の側面部にその軸芯方向に連続して形成され
た取付溝に固着することを特徴とする。According to a second aspect of the present invention, there is provided a method of reinforcing a concrete column according to the first aspect, wherein the reinforcing wire is fixed to a mounting groove formed continuously in the axial direction on the side surface of the reinforced concrete column. And
【００１０】この発明に係る請求項３記載のコンクリー
ト柱の補強方法は、１項および２項において、補強線材
は折曲して鉄筋コンクリート柱の一側面から反対側にか
けて斜めに跨設し、鉄筋コンクリート柱の中間部におい
て他の補強線材とＸ形にクロスさせて取り付けることを
特徴とする。According to a third aspect of the present invention, there is provided a method of reinforcing a concrete column according to any one of the first to second aspects, wherein the reinforcing wire is bent and laid obliquely from one side to the opposite side of the reinforced concrete column. In the middle part of the above, it is characterized by being crossed with another reinforcing wire in an X-shape.
【００１１】[0011]
【発明の実施の形態】発明の実施の形態１． 図１および図２は、この発明の実施の一形態例を示し、
図において、符号１は矩形断面形に構築された鉄筋コン
クリート構造の柱、２と３は鉄筋コンクリートによって
構築され、柱１の上端部と下端部とにそれぞれ接合され
た上階のはりと下階のはり、４と５はともに鉄筋コンク
リートによって構築され、それぞれ柱１の柱頭部ａと柱
脚部ｂに接合された下がり壁と腰壁、６は柱１の側部に
柱１の軸芯方向に連続して添え付けられ、柱１の曲げ耐
力を高める補強線材、そして、符号７は柱１の外周に巻
き付けられ、柱１を剪断補強する鋼板又は高強力繊維補
強シートである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the Invention 1 and 2 show an embodiment of the present invention,
In the drawing, reference numeral 1 denotes a column of a reinforced concrete structure constructed in a rectangular cross section, 2 and 3 are constructed of reinforced concrete, and an upper floor beam and a lower floor beam joined to the upper end and the lower end of the column 1, respectively. , 4 and 5 are both constructed of reinforced concrete, and the descending wall and the waist wall joined to the column cap a and the column base b of the column 1, respectively, and 6 are connected to the side of the column 1 in the axial direction of the column 1. A reinforcing wire rod attached to the column 1 to increase the bending strength of the column 1 and a reference numeral 7 is a steel plate or a high-strength fiber reinforced sheet wound around the column 1 to shear and reinforce the column 1.
【００１２】柱１とはり２、３および下がり壁４と腰壁
５は、ともに在来の慣用鉄筋コンクリート設計法によっ
て構築されている。なお、柱１は六角形等の多角形断面
又は円形断面に構築されてもよい。The column 1, the beams 2, 3 and the down wall 4 and the lumbar wall 5 are both constructed by a conventional conventional reinforced concrete design method. In addition, the pillar 1 may be constructed in a polygonal section such as a hexagon or a circular section.
【００１３】補強線材６は鉄筋、ＰＣ鋼棒、ＰＣ鋼より
線又はＦＲＰ筋などから形成され、かつ、柱１の各側面
部に柱１の軸芯方向に連続して取り付けられ、その上下
両端６ａは下がり壁４と腰壁５に達している。この場
合、補強線材６は柱１の各側面部に柱１の軸芯方向に連
続して形成された所定深さの取付溝１ａ内に高強力樹脂
性接着材によって固着されている。The reinforcing wire 6 is formed of a reinforcing bar, a PC steel bar, a PC stranded wire, an FRP bar, or the like, and is attached to each side surface of the column 1 continuously in the axial direction of the column 1. 6a reaches the falling wall 4 and the waist wall 5. In this case, the reinforcing wire 6 is fixed with a high-strength resinous adhesive in a mounting groove 1 a having a predetermined depth formed continuously on each side surface of the pillar 1 in the axial direction of the pillar 1.
【００１４】なお、補強線材６の径、本数、ピッチおよ
び定着長さは、場所に応じて適宜決められている。ま
た、取付溝１ａは在来の切削機により形成するものとす
る。The diameter, the number, the pitch and the fixing length of the reinforcing wires 6 are appropriately determined according to the location. The mounting groove 1a is formed by a conventional cutting machine.
【００１５】また、補強線材６は柱１の軸芯方向に連続
して取り付け、かつ、その両端をはり２と３にそれぞれ
定着してもよい。The reinforcing wire 6 may be continuously attached in the axial direction of the column 1 and both ends may be fixed to the beams 2 and 3, respectively.
【００１６】鋼板又は高強力繊維補強シート７は柱１の
外周に一回、又は必要に応じて二回ないしそれ以上巻き
付けられている。また、必要に応じて一定の張力が導入
されている。また、鋼板又は高強力繊維補強シート７は
柱１の軸芯方向に連続するスパイラル状又は単に鉢巻き
状（テープ状）に巻き付けられている。さらに、高強力
繊維補強シート７に硬化性合成樹脂材を塗着又は含浸さ
せて硬化させることにより柱１と高強力繊維補強シート
７との一体化を図ると共に、その後の柱の仕上げをし易
くしてある。The steel plate or the high-strength fiber reinforced sheet 7 is wound around the outer periphery of the column 1 once, or twice or more as necessary. Also, a constant tension is introduced as needed. Further, the steel plate or the high-strength fiber reinforced sheet 7 is wound in a spiral shape or simply a headband shape (tape shape) continuous in the axial direction of the column 1. Further, by hardening the high-strength fiber-reinforced sheet 7 by coating or impregnating a curable synthetic resin material, the column 1 and the high-strength fiber-reinforced sheet 7 are integrated, and the finishing of the subsequent columns is facilitated. I have.
【００１７】以上の構成によって補強された柱１は、補
強線材６が柱１のコンクリート中に配筋された主筋の一
部をなすことにより曲げ耐力が著しく高められ、また、
鋼板又は高強力繊維補強シート７のコンファインド効果
によって剪断耐力が著しく高められる。In the column 1 reinforced by the above configuration, the reinforcing wire 6 forms a part of the main reinforcing bars arranged in the concrete of the column 1 so that the bending strength is remarkably increased.
The shear strength is significantly increased by the confined effect of the steel sheet or the high-strength fiber reinforced sheet 7.
【００１８】発明の実施の形態２. 図３は、この発明の実施の他の形態を示し、補強線材６
は折曲して柱１の一側面から反対側面にかけて斜めに跨
設され柱１の中間部において他の補強線材６とＸ形状に
クロスさせて取り付けられている。その他の構成は、発
明の実施の形態１とほぼ同じである。Embodiment 2 of the Invention FIG. 3 shows another embodiment of the present invention.
Is bent and obliquely straddled from one side surface to the opposite side surface of the column 1, and is attached to the middle portion of the column 1 so as to cross another reinforcing wire 6 in an X shape. Other configurations are almost the same as those of the first embodiment.
【００１９】この実施の形態によれば、補強線材６は曲
げ補強材として働くだけでなく、剪断補強材としても働
くのできわめて合理的な設計を行えるなどの効果があ
る。According to this embodiment, since the reinforcing wire 6 functions not only as a bending reinforcing material but also as a shear reinforcing material, there is an effect that an extremely rational design can be performed.
【００２０】[0020]
【発明の効果】この発明に係る鉄筋コンクリート柱の補
強方法は以上説明した構成からなり、鉄筋コンクリート
柱に複数本の補強線材をその軸芯方向に連続して取り付
け、かつ、前記鉄筋コンクリート柱に高強力繊維補強シ
ートを巻き付けることにより、柱の曲げ耐力および剪断
耐力をきわめて効率的かつ簡単に高めることができ、特
に下がり壁や腰壁を有する柱に対しては、補強線材を数
多く取り付けることにより剪断耐力以上に曲げ耐力を高
めることができるので、強震時の柱の耐力を確実に向上
させることができる。The method of reinforcing a reinforced concrete column according to the present invention has the above-described structure, and a plurality of reinforcing wires are continuously attached to a reinforced concrete column in the axial direction thereof, and a high-strength fiber is attached to the reinforced concrete column. By wrapping the reinforcing sheet, the bending strength and shear strength of the column can be increased very efficiently and easily. Especially for columns with falling walls and waist walls, the shear strength can be increased by attaching a large number of reinforcing wires. Since the bending strength can be increased, the strength of the column during a strong earthquake can be reliably improved.
【００２１】また、補強線材は鉄筋コンクリート柱の側
面部にその軸芯方向に連続して形成された取付溝に取り
付けられているので、補強線材を柱の側部に確実にかつ
きわめて簡単に定着できる効果がある。Further, since the reinforcing wire is attached to the mounting groove formed continuously on the side surface of the reinforced concrete column in the axial direction thereof, the reinforcing wire can be reliably and extremely easily fixed to the side of the column. effective.
【００２２】さらに、補強線材は鉄筋コンクリート柱の
中間部においてＸ形状にクロスさせて取り付けることに
より、補強線材を曲げ補強材としてだけでなく、剪断補
強材としても利用できるので、きわめて合理的な設計が
できる効果がある。Furthermore, since the reinforcing wire is attached to the middle part of the reinforced concrete column by crossing it in an X shape, the reinforcing wire can be used not only as a bending reinforcing material but also as a shearing reinforcing material. There is an effect that can be done.
【図１】補強線材および高強力繊維補強シートの設置状
態を示す鉄筋コンクリート柱の側面図である。FIG. 1 is a side view of a reinforced concrete column showing a state in which a reinforcing wire and a high-strength fiber reinforced sheet are installed.
【図２】(a) は図１におけるａ−ａ線断面図、(b) は図
１におけるｂ−ｂ線断面図である。2A is a sectional view taken along line aa in FIG. 1, and FIG. 2B is a sectional view taken along line bb in FIG.
【図３】他の実施の態様を示す鉄筋コンクリート柱の側
面図である。FIG. 3 is a side view of a reinforced concrete column showing another embodiment.
１…鉄筋コンクリート構造の柱、２…上階のはり、３…
下階のはり、４…下がり壁、５…腰壁、６…補強線材、
７…鋼板又は高強力繊維補強シート。1 ... pillar of reinforced concrete structure 2 ... beam on upper floor 3 ...
Lower beam, 4 ... falling wall, 5 ... waist wall, 6 ... reinforcement wire,
7 ... steel plate or high-strength fiber reinforced sheet.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−83768（ＪＰ，Ａ) 特公 昭48−22098（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) E04G 23/02 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-64-83768 (JP, A) JP-B-48-22098 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) E04G 23/02
Claims (3)
壁を接合した鉄筋コンクリート柱に複数本の補強線材
を、その上、下端部をそれぞれ下がり壁と腰壁に達する
よう軸芯方向に連続して取り付け、かつ、前記鉄筋コン
クリート柱に高強力繊維補強シートを巻き付けることを
特徴とする鉄筋コンクリート柱の補強方法。1. A plurality of reinforcing wires are reinforced on a reinforced concrete pillar having a lower wall and a lower wall joined to a column head and a column base, respectively, and the upper and lower ends thereof are respectively lowered in the axial direction so as to reach the lower wall and the lower wall. A method for reinforcing a reinforced concrete column, comprising continuously attaching and wrapping a high-strength fiber reinforced sheet around the reinforced concrete column.
にその軸芯方向に連続して形成された取付溝に固着する
ことを特徴とする請求項１記載の鉄筋コンクリート柱の
補強方法。2. The method for reinforcing a reinforced concrete column according to claim 1, wherein the reinforcing wire is fixed to a mounting groove formed continuously in the axial direction on a side surface of the reinforced concrete column.
の一側面から反対側面にかけて、斜めに跨設し、鉄筋コ
ンクリート柱の中間部において他の補強線材とＸ形にク
ロスさせて取り付けることを特徴とする請求項１記載の
鉄筋コンクリート柱の補強方法。3. The reinforcing wire rod is bent and laid obliquely from one side to the opposite side of the reinforced concrete column, and is attached in a middle portion of the reinforced concrete column so as to cross the other reinforcing wires in an X-shape. The method for reinforcing a reinforced concrete column according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7314203A JP3018967B2 (en) | 1995-12-01 | 1995-12-01 | Reinforcement method for reinforced concrete columns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7314203A JP3018967B2 (en) | 1995-12-01 | 1995-12-01 | Reinforcement method for reinforced concrete columns |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09151612A JPH09151612A (en) | 1997-06-10 |
| JP3018967B2 true JP3018967B2 (en) | 2000-03-13 |
Family
ID=18050518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7314203A Expired - Fee Related JP3018967B2 (en) | 1995-12-01 | 1995-12-01 | Reinforcement method for reinforced concrete columns |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3018967B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2977075B2 (en) * | 1996-07-05 | 1999-11-10 | 株式会社フジタ | Seismic retrofit method for existing reinforced concrete buildings |
| FR2792355B1 (en) * | 1999-04-16 | 2007-10-12 | Lefevre Sa M | METHOD FOR REINFORCING A BUILDING ELEMENT |
| KR20030037117A (en) * | 2001-11-02 | 2003-05-12 | 한국건설기술연구원 | Structure strengthening method which is made of shear key and fiber sheet |
| JP4084618B2 (en) * | 2002-08-30 | 2008-04-30 | 三井住友建設株式会社 | Concrete reinforcement method |
| KR100498247B1 (en) * | 2002-09-02 | 2005-07-01 | 김원기 | Seismic upgrading method of concrete column and concrete column reinforced thereby |
| JP5213248B2 (en) * | 2008-12-15 | 2013-06-19 | 前田建設工業株式会社 | Seismic reinforcement structure for existing buildings |
| JP5626663B2 (en) * | 2012-04-25 | 2014-11-19 | 一般社団法人 レトロフィットジャパン協会 | Reinforced structure of extremely brittle columns |
| CN103726506B (en) * | 2014-01-13 | 2015-12-30 | 中衡设计集团股份有限公司 | Wooden construction suspension column and foundation connection structure |
| CN104389438B (en) * | 2014-12-10 | 2017-03-01 | 华北水利水电大学 | A kind of seismic hardening mechanism of concrete column and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4822098B1 (en) * | 1969-01-20 | 1973-07-03 | ||
| JPS6483768A (en) * | 1987-09-25 | 1989-03-29 | Mitsubishi Chem Ind | Method of reinforcing existing structure |
-
1995
- 1995-12-01 JP JP7314203A patent/JP3018967B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09151612A (en) | 1997-06-10 |
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