JP2005009307A - Reinforcing material for hybrid fiber reinforced polymer - Google Patents
Reinforcing material for hybrid fiber reinforced polymer Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
- F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
- F16B13/065—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting the screw, nail or the like
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
本発明は鉄筋コンクリート構造物を含む構造物の内部または外部に設置されて構造物に作用する外部荷重に対して構造物が軟性破壊挙動するように機能する構造物用ＦＲＰ補強材に関する。 The present invention relates to an FRP reinforcing material for a structure which is installed inside or outside a structure including a reinforced concrete structure and functions so that the structure behaves softly against an external load acting on the structure.
従来のコンクリート構造物においてコンクリートは圧縮には強いが引張には弱いので、引張応力が発生する部位に通常、鉄筋を配置させて引張応力を負担するようにしている。 即ち、コンクリートに作用する引張応力を鉄筋が負担するようにすることで、コンクリートと鉄筋、それぞれの材料的特性を最大に利用するコンクリート構造物の設計及び製作方法が利用されている。
このようなコンクリート構造物に使用される鉄筋は圧縮強度及び引張強度が大きくて、比較的に加工しやすい物性を有するので、コンクリート補強材として幅広く活用され、外部荷重によって降伏された後、追加的な応力の負担なしに変形率が増加する軟性的破壊挙動の特性を現わすので、コンクリートに配される鉄筋量を調節してコンクリート構造物の脆性破壊を防止することができる。
In conventional concrete structures, since concrete is strong against compression but weak against tension, a reinforcing bar is usually arranged at a site where tensile stress is generated so as to bear the tensile stress. That is, a concrete structure design and manufacturing method that utilizes the material properties of the concrete and the reinforcing bar to the maximum is used by making the reinforcing bars bear the tensile stress acting on the concrete.
Reinforcing bars used in such concrete structures have high compressive strength and tensile strength and are relatively easy to process. Therefore, they are widely used as concrete reinforcements, and after being yielded by external loads, additional Since it exhibits the characteristic of soft fracture behavior in which the deformation rate increases without burdening the stress, it is possible to prevent the brittle fracture of the concrete structure by adjusting the amount of reinforcing bars arranged in the concrete.
このような長所にもかかわらず、鉄筋はコンクリート被覆の損傷などの理由から外部に露出される場合、腐食が進行して構造物の耐久性が低下する恐れがあり、構造物の安全に深刻な影響をかけるだけではなく、相当の重量のため運び及び設置に多くの努力と費用が要求される問題があった。 In spite of these advantages, if the reinforcing bar is exposed to the outside due to damage to the concrete coating, the corrosion may progress and the durability of the structure may be reduced. In addition to the impact, there was a problem that a lot of effort and cost were required for transportation and installation due to its considerable weight.
よって、このような鉄筋を代替することができるコンクリート構造物の補強材の開発が要求されつつあり、このような要求を満足させることができるものの一つとして繊維強化ポリマー（Ｆｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ Ｐｏｌｙｍｅｒ）で製造された補強材（以下「ＦＲＰ補強材」と称する）である。
前記 ＦＲＰ補強材は軽量であり、腐食されず、強度が大きくて、絶縁性が優秀であるのでコンクリート補強材として多様な形態で開発され、実用化されている。 一般に、ＦＲＰ補強材に使われる複合繊維は炭素繊維、アラミド繊維、ガラスファイバーなどがある。
特にコンクリート構造物用補強材として利用される ＦＲＰ補強材の場合、その利用形態及び適用対象によって多様な適用工法が開発され、それに当たるものにはシート型、板（ｌａｍｉｎａｔｅ）型及び鉄筋のようなバー（Ｂａｒ 又は Ｒｏｄ）型 ＦＲＰ補強材などがある。
Therefore, development of a reinforcing material for a concrete structure that can replace such a reinforcing bar is being demanded, and it is manufactured with fiber reinforced polymer as one of the things that can satisfy such a demand. The reinforcing material (hereinafter referred to as “FRP reinforcing material”).
Since the FRP reinforcing material is lightweight, is not corroded, has high strength, and has excellent insulation, it has been developed and put into practical use in various forms as a concrete reinforcing material. In general, composite fibers used for FRP reinforcing materials include carbon fibers, aramid fibers, and glass fibers.
In particular, in the case of FRP reinforcements used as reinforcements for concrete structures, various application methods have been developed depending on the application form and application object, such as sheet molds, laminate molds, and reinforcing bars. There are Bar or Rod type FRP reinforcements.
例えば、「特許文献１」特開昭６４−２９２７６号公報には、樹脂含浸したガラスロービングを配して引抜成型する際、ガラスロービング層の外側に樹脂硬化により一体化される有機繊維を捲層し、この有機繊維層に樹脂を含浸せしめ、金属により所定のＦＲＰパイプを引抜成型し、この ＦＲＰパイプの外側にブナのつき板を捲層点着した ＦＲＰ製バーが記載されている。
しかし、このようなＦＲＰ補強材の材料的、構造的な長所にもかかわらず、外部荷重による破壊までの挙動を図示した応力（σ）-変形率（ε） グラフである図 1のように、炭素繊維を利用した炭素繊維ＦＲＰ補強材（Ａ）、アラミド繊維を利用したアラミド繊維ＦＲＰ補強材（Ｂ）及びガラス・ファイバーを利用したガラス・ファイバーＦＲＰ補強材（Ｃ）、それぞれは弾性挙動区間（Ｅ１、Ｅ２、Ｅ３）を経由して降伏（Ｙ１、Ｙ２、Ｙ３）以後には脆性的な破壊挙動（応力曲線の急落）を示し、その利用において最大の障害物として指摘されて来た。
However, in spite of the material and structural advantages of such FRP reinforcements, as shown in Fig. 1, which is a stress (σ) -deformation rate (ε) graph illustrating the behavior up to failure due to external load, Carbon fiber FRP reinforcement using carbon fiber (A), aramid fiber FRP reinforcement using aramid fiber (B) and glass fiber FRP reinforcement using glass fiber (C), each with elastic behavior section ( After yielding (Y1, Y2, Y3) via E1, E2, E3), it showed brittle fracture behavior (sudden drop of stress curve) and has been pointed out as the largest obstacle in its use.
そこで、望ましい混成 ＦＲＰ補強材（Ｄ）の応力（σ）-変形率（ε）のグラフである図 ２のようにＦＲＰ補強材の脆性的な挙動を防止し、軟性的な挙動を確保することができる混成ＦＲＰ補強材（Ｈｙｂｒｉｄ Ｆｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ Ｐｏｌｙｍｅｒ Ｒｅｉｎｆｏｒｃｉｎｇ Ｍａｔｅｒｉａｌ）に関する技術開発が試みされた。 即ち、ＦＲＰ補強材の応力（σ）-変形率（ε）のグラフで混成ＦＲＰ補強材（Ｄ）の場合のように弾性挙動区間（Ｅ）では所定の傾きを有する直線形態で挙動するが、混成ＦＲＰ補強材の降伏（Ｙ）以後、塑性変形区間（Ｐ）には応力の変化がほとんどない水平線の形態で外部荷重に対して挙動する混成ＦＲＰ補強材の技術開発が試みされた。
図３は前記軟性的な挙動を確保することができる従来の混成ＦＲＰ補強材に関する技術を図示する。
前記、図３の混成ＦＲＰ補強材（１０）は炭素繊維などで内部が満たされた一方向内部芯材（Ｕｎｉｄｉｒｅｃｔｉｏｎａｌ Ｃｏｒｅ）を配置し、そのまわりに破断伸度が大きいアラミド繊維（またはガラス・ファイバー、１１）のような外部補強繊維（Ｅｘｔｅｒｉｏｒ Ｙａｒｎ）を螺旋形でくるむように形成されるＦＲＰ 補強バー（１０）である。
Therefore, to prevent the brittle behavior of the FRP reinforcement as shown in Fig. 2 which is a graph of stress (σ) -deformation rate (ε) of the desired hybrid FRP reinforcement (D), and ensure the flexible behavior. Technological development related to a hybrid FRP reinforcing material (Hybrid Fiber Reinforced Polymer Reforming Material) that can be used has been attempted. That is, in the FRP reinforcement stress (σ) -deformation rate (ε) graph, the elastic behavior section (E) behaves in a linear form having a predetermined inclination as in the case of the hybrid FRP reinforcement (D). After the yield (Y) of the hybrid FRP reinforcement, technical development of a hybrid FRP reinforcement that behaves in response to an external load in the form of a horizontal line with almost no change in stress in the plastic deformation section (P) was attempted.
FIG. 3 illustrates a technique related to a conventional hybrid FRP reinforcement that can ensure the soft behavior.
The hybrid FRP reinforcing material (10) shown in FIG. 3 has an unidirectional internal core (unidirectional core) filled with carbon fiber or the like, and an aramid fiber (or glass fiber) having a high elongation at break. , 11) is an FRP reinforcing bar (10) formed so that an external reinforcing fiber (Exitor Yarn) is wrapped in a spiral shape.
しかし、図３に図示された従来の混成ＦＲＰ補強バー（１０）の場合、破断伸率の小さな内部芯材（１２）が外部荷重によって先に破断された後、螺旋形で縒られた外部補強繊維（１１）が反復的に部分的な破断及びスリップ（ＳｌｉＰ）が発生されながら追後応力を負担する形態の力学挙動に伴うので、図４のように 前記弾性変形区間（Ｅ）から塑性変形区間（Ｐ）へ行く段階で急激な応力曲線の下降が発生して全体的な混成ＦＲＰ補強材の破壊挙動が軟性破壊挙動の形態にならないので、図２のように望ましい混成ＦＲＰ補強材（Ｄ）として利用するには適当ではないという問題があった。
本発明は、このような問題を解決するためのもので、本発明はコンクリートなどで製作される構造物の補強材として、混成ＦＲＰ補強材の降伏（Ｙ）以後、塑性変形区間（Ｐ）を通しながら急激な応力変化なしに、ほとんど水平線形態に挙動して、外部荷重に対して軟性破壊挙動の様相を示す混成ＦＲＰ補強材を提供することにその目的がある。
However, in the case of the conventional hybrid FRP reinforcing bar (10) shown in FIG. 3, the external reinforcing member wound in a spiral shape after the inner core material (12) having a small elongation at break is first broken by an external load. Since the fiber (11) is accompanied by the mechanical behavior in which the post-stress is borne while the partial fracture and slip (SliP) are repeatedly generated, the plastic deformation from the elastic deformation section (E) as shown in FIG. Since a sudden drop in the stress curve occurs at the stage of going to the section (P) and the fracture behavior of the overall hybrid FRP reinforcement does not take the form of a soft fracture behavior, a desirable hybrid FRP reinforcement (D ) Was not suitable for use.
The present invention is for solving such a problem, and the present invention provides a plastic deformation section (P) after the yield (Y) of the hybrid FRP reinforcing material as a reinforcing material for a structure made of concrete or the like. The purpose is to provide a hybrid FRP reinforcement that behaves almost in the form of a horizontal line without abrupt stress changes while passing through and exhibits an aspect of soft fracture behavior with respect to external loads.
本発明は混成ＦＲＰ補強材として内部芯材（１１０）をくるむように配置された繊維補強ポリマー体（１２０）を含んで構成するが、前記繊維補強ポリマー体（１２０）より降伏強度が低い内部芯材（１１０）がまず、外部荷重によって降伏状態に到逹すると、追加的な応力の負担なしに内部芯材の変形率が大きくなって混成ＦＲＰ補強材が軟性的に挙動するようにし、さらに内部芯材（１１０）の降伏後には繊維補強ポリマー体（１２０）が外部荷重を負担するが螺旋形で縒られる繊維補強ポリマー体（１２０）が直径方向に内部芯材（１１０）に圧力を増加させて内部芯材（１１０）が坐屈などによって断面積（または直径）が減少されると繊維補強ポリマー体（１２０）も直径方向に変形を起こして追加的な応力の負担なしに変形率のみ大きくなることによって、結局、内部芯材の降伏及び内部芯材の断面積減少によって繊維補強ポリマーが追加的な応力の負担なしに変形率が増加されて混成ＦＲＰ補強材が外部荷重に対して軟性的に挙動するようにする。
図５は前記内部芯材（１１０）と繊維補強ポリマー体（１２０）で構成された本発明の混成ＦＲＰ補強材（１００）が外部荷重を受ける場合の力学的な挙動（破壊挙動）を第１段階乃至第４段階に分けて図示した応力-変形率グラフである。
The present invention comprises a fiber reinforced polymer body (120) arranged so as to enclose the inner core material (110) as a hybrid FRP reinforcing material, but the inner core material has a lower yield strength than the fiber reinforced polymer body (120). When (110) first reaches the yield state by an external load, the deformation rate of the inner core material increases without burden of additional stress so that the hybrid FRP reinforcing material behaves softly. After the yield of the material (110), the fiber reinforced polymer body (120) bears an external load, but the fiber reinforced polymer body (120) wound in a spiral shape increases the pressure on the inner core material (110) in the diameter direction. When the cross-sectional area (or diameter) of the inner core material (110) is reduced due to buckling or the like, the fiber-reinforced polymer body (120) is also deformed in the diametrical direction, and the deformation rate can be reduced without additional stress. As a result, the yield rate of the inner core material and the reduction of the cross-sectional area of the inner core material increase the deformation rate of the fiber reinforced polymer without any additional stress, and the hybrid FRP reinforcement material is soft against the external load. To behave in a dynamic manner.
FIG. 5 shows the first mechanical behavior (fracture behavior) when the hybrid FRP reinforcing material (100) of the present invention composed of the inner core material (110) and the fiber-reinforced polymer body (120) is subjected to an external load. 6 is a stress-deformation rate graph divided into stages to fourth stages.
第1段階は内部芯材（１１０）の降伏強度より小さな外部荷重が加えられることに伴って内部芯材（１１０）及び繊維補強ポリマー体（１２０）が線形で挙動（一定な弾性係数を有する）する直線形態の線形区間である。最終頂点（Ａ）にあたる応力が内部芯材の降伏強度である。
第２段階は内部芯材（１１０）が降伏する段階として内部芯材が降伏するに伴って追加的な応力の負担なしに、内部芯材の変形率が増加される区間である。最終頂点（Ｂ）にあたる応力は内部芯材が坐屈などによって直径方向に変形を起こす時点になる。
第３段階は内部芯材（１１０）の坐屈などのような物理的な変形によって追加的に繊維補強ポリマー体（１２０）が別途の応力の負担なしに変形が増加される区間である。即ち、内部芯材（１２０）を螺旋形態でくるんでいる繊維補強ポリマー体（１２０）が外部荷重を負担するによって内部芯材（１２０）に直径方向に圧縮応力が伝達され、これによって内部芯材（１１０）が局所的または全面的に坐屈などが発生されて断面積が減少され、これに伴って繊維補強ポリマー体（１２０）の断面積も減少されて繊維補強ポリマー体（１２０）の追加的な応力の負担なしに変形が増加される区間である。
従って、本発明の混成ＦＲＰ補強材（１００）は外部荷重に対して連続的（曲）線形態になって図２の混成ＦＲＰ補強材（Ｄ）のように外部荷重に対する十分な軟性破壊挙動を確保することができるようになる。最終頂点（Ｃ）にあたる応力は内部芯材の坐屈の終了する終点になり、この区間以後には繊維補強ポリマー体（１２０）自体が外部荷重による応力を負担することになる。
第4段階は内部芯材（１１０）の坐屈などのような物理的変形が終わった後、繊維補強ポリマー体（１２０）が外部荷重に対して応力を負担しながら最終的に破断に至る区間である。
即ち、本発明においては従来の混成ＦＲＰ補強材とは違い、内部芯材の物理的な変形によって繊維補強ポリマー体の応力の負担なしに変形が増加される区間を通すようになることで、全体的に図２のように望ましい混成ＦＲＰ補強材の外部荷重に対する応力-変形率曲線（Ｄ）を得ることができ、結果的に外部荷重に対して軟性破壊挙動で作用するようになる。
In the first stage, the internal core (110) and the fiber-reinforced polymer body (120) behave linearly (having a constant elastic modulus) when an external load smaller than the yield strength of the internal core (110) is applied. It is a linear section of a straight line form. The stress corresponding to the final vertex (A) is the yield strength of the inner core material.
The second stage is a section in which the deformation rate of the internal core material is increased without the burden of additional stress as the internal core material yields as the stage where the internal core material (110) yields. The stress corresponding to the final vertex (B) is the time when the inner core material deforms in the diameter direction due to buckling or the like.
The third stage is a section where the deformation of the fiber-reinforced polymer body (120) is increased without additional stress due to physical deformation such as buckling of the inner core (110). That is, when the fiber reinforced polymer body (120) that wraps the inner core material (120) in a spiral form bears an external load, a compressive stress is transmitted to the inner core material (120) in the diametrical direction. (110) is locally or entirely buckled, and the cross-sectional area is reduced. Accordingly, the cross-sectional area of the fiber-reinforced polymer body (120) is also reduced and the fiber-reinforced polymer body (120) is added. This is a section where the deformation is increased without burden of the typical stress.
Therefore, the hybrid FRP reinforcing material (100) of the present invention has a continuous (curved) line shape with respect to the external load, and exhibits a sufficient soft fracture behavior with respect to the external load like the hybrid FRP reinforcing material (D) of FIG. It will be possible to secure. The stress corresponding to the final vertex (C) is the end point at which the buckling of the inner core ends, and the fiber-reinforced polymer body (120) itself bears the stress due to the external load after this section.
In the fourth stage, after physical deformation such as buckling of the inner core material (110) is finished, the fiber reinforced polymer body (120) finally breaks while bearing stress against the external load. It is.
That is, in the present invention, unlike the conventional hybrid FRP reinforcing material, by passing through the section where the deformation is increased without the burden of stress of the fiber reinforced polymer body due to the physical deformation of the inner core material, In particular, as shown in FIG. 2, a desirable stress-deformation curve (D) with respect to the external load of the hybrid FRP reinforcing material can be obtained, and as a result, it acts on the external load with a soft fracture behavior.
本発明によって降伏及び断面積（または直径）の減少が可能な内部芯材と繊維補強ポリマー体で構成された混成ＦＲＰ補強材を提供することで、既存のＦＲＰ補強材で製作されたバー（Ｂａｒ）、繊維補強板及び補強繊維シートとは違い、十分な軟性破壊挙動を確保することができて構造物の軟性破壊挙動を誘導することができるＦＲＰ補強材を提供することができる。
さらに、本発明の混成ＦＲＰ補強材を鉄筋代替用で利用する場合、鉄筋コンクリート構造物の耐久性を増進させることができ、構造物の補修、補強による経済的損失を節減することができる。
By providing a hybrid FRP reinforcement composed of an inner core material and a fiber-reinforced polymer body capable of yielding and reducing a cross-sectional area (or diameter) according to the present invention, a bar made of an existing FRP reinforcement (Bar) ), Unlike the fiber reinforced plate and the reinforced fiber sheet, it is possible to provide an FRP reinforcing material capable of ensuring a sufficient soft fracture behavior and inducing the soft fracture behavior of the structure.
Furthermore, when the hybrid FRP reinforcing material of the present invention is used for replacing reinforcing bars, the durability of the reinforced concrete structure can be improved, and economic loss due to repair and reinforcement of the structure can be reduced.
以下、図面を参照して本発明の望ましい一実施例をより詳細に説明する。
本発明の混成ＦＲＰ補強材（１００）は内部芯材（１１０）をくるむように配置された繊維補強ポリマー体（１２０）を含む構造物の補強材として、
前記内部芯材（１１０）は繊維補強ポリマー体より降伏強度が低い中空管に形成され、前記繊維補強ポリマー体（１２０）は内部芯材のまわりを繊維補強ポリマー材質の縒られた糸（Ｙａｒｎ）を利用して全体的に内部芯材を螺旋形態でくるむように配置される。
このような本発明のＦＲＰ補強材は混成繊維補強ポリマー補強材（Ｈｙｂｒｉｄ ｆｉｂｅｒ ｒｅｉｎｆｏｒｃｉｎｇ ｐｏｌｙｍｅｒ ｒｅｉｎｆｏｒｃｉｎｇ ｍａｔｅｒｉａｌ、以下 「混成ＦＲＰ補強材」）と指称する。 図６は本発明の混成ＦＲＰ補強材（１００）の一部の斜視図として全体的な形状がバー（Ｂａｒ）の形態で構成される。
前記内部芯材（１１０）は混成ＦＲＰ補強材（１００）の中央に配置され、そのまわりに形成された繊維補強ポリマー体（１２０）より降伏強度が低くて外部荷重に対して繊維補強ポリマー体（１２０）より先に降伏されて、追加的な応力の負担なしに変形率が増加される構造用鋼材の材料的な特性を有し、全体的な形状は混成ＦＲＰ補強材の利用形態によって変更できるが、望ましくは管（Ｐｉｐｅ）の形状に形成される。
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.
The hybrid FRP reinforcing material (100) of the present invention is a reinforcing material for a structure including a fiber-reinforced polymer body (120) disposed so as to surround an inner core material (110).
The inner core material (110) is formed in a hollow tube having a yield strength lower than that of a fiber reinforced polymer body, and the fiber reinforced polymer body (120) is wound around the inner core material with a yarn (Yarn) made of a fiber reinforced polymer material. ) And the inner core material is disposed so as to be spirally formed.
Such an FRP reinforcing material of the present invention is referred to as a hybrid fiber reinforced polymer reinforcing material (hereinafter referred to as “hybrid FRP reinforcing material”). FIG. 6 is a perspective view of a part of the hybrid FRP reinforcing material (100) of the present invention, and the overall shape is configured in the form of a bar.
The inner core material (110) is disposed at the center of the hybrid FRP reinforcing material (100), has a lower yield strength than the fiber reinforced polymer body (120) formed therearound, and the fiber reinforced polymer body ( 120) has the material properties of structural steel that yields before and increases the deformation rate without burdening additional stress, and the overall shape can be changed by the usage of the hybrid FRP reinforcement However, it is preferably formed in the shape of a pipe.
前記内部芯材（１１０）は繊維補強ポリマー体（１２０）が外部荷重を負担しながら直径方向に発生して伝わる内部圧力によって局所的な坐屈などのようにその断面積が小くなる物理的な変形（直径または厚さの減少などのような断面積減少）が可能だとすると繊維補強ポリマー体（ＦＲＰ）、金属、非金属鋼材を全部含み、円形、四角形などその形状において制限がない。
望ましくはこのような内部芯材（１１０）として中が空いた円型鋼管または横長方向がもっと長い楕円形鋼管を使えば鋼材の材料的な特性及び局所坐屈のような物理的な変形を容易に確保することができるという長所がある。
本発明で内部芯材（１１０）は作用する外部荷重が内部芯材の降伏強度に到逹しながら発生される降伏段階以後、追加的な応力の負担なしに変形率が増加されることで外部荷重に対して混成ＦＲＰ補強材が軟性挙動ができるようにする役割をし、
さらに、その降伏が完了した後、内部芯材（１１０）を取り囲んでいる繊維補強ポリマー体（１２０）が作用する外部荷重を負担する段階で、内部芯材（１１０）は前記繊維補強ポリマー体（１２０）から直径方向に伝達される内部圧力によって、その厚さまたは直径が減少される物理的な変形、即ち、断面積の減少によって内部芯材（１１０）を取り囲んでいる繊維補強ポリマー体（１２０）の断面積が自然に減少されるようにすることで、繊維補強ポリマー体（１２０）が外部荷重によって応力を追加的に負担しなくても変形率が増加されるようにする役割をする。
The internal core (110) is physically reduced in cross-sectional area such as local buckling due to internal pressure generated and transmitted in a diametrical direction while the fiber reinforced polymer body (120) bears an external load. If it is possible to make various deformations (cross-sectional area reduction such as reduction in diameter or thickness), it includes all fiber-reinforced polymer bodies (FRP), metals, and non-metallic steel materials, and there are no restrictions on the shape such as circular or square.
Desirably, if such a hollow circular steel pipe or an elliptical steel pipe having a longer lateral direction is used as the inner core material (110), the material characteristics of the steel material and physical deformation such as local buckling are facilitated. There is an advantage that can be secured.
In the present invention, the internal core (110) is subjected to external deformation by increasing the deformation rate without any additional stress after the yielding stage in which the applied external load reaches the yield strength of the internal core. The role of the hybrid FRP reinforcement to allow soft behavior against the load,
Furthermore, after the yielding is completed, the inner core material (110) bears the fiber-reinforced polymer body (110) at the stage of bearing an external load on which the fiber-reinforced polymer body (120) surrounding the inner core material (110) acts. 120) a fiber-reinforced polymer body (120) surrounding the inner core (110) by a physical deformation whose thickness or diameter is reduced by an internal pressure transmitted in a diametrical direction, i.e. by reducing the cross-sectional area. ) Is naturally reduced, the fiber-reinforced polymer body (120) serves to increase the deformation rate even if the stress is not additionally imposed by an external load.
即ち、本発明の内部芯材（１１０）はその自体の材料的な特性 降伏後応力の負担なしに変形率増加及び物理的な形状変形（伝達される内部圧力による断面積または直径減少）によって混成ＦＲＰ補強材が外部荷重に対する挙動で軟性破壊挙動をするようにする機能を有する。
前記繊維補強ポリマー体（１２０）はＦＲＰ補強繊維として炭素繊維、アラミド繊維またはガラス・ファイバーなどが縒られる糸の形態（Ｙａｒｎ）で内部芯材（１１０）のまわりを全体的に螺旋形で包むように形成される。さらに、前記３種類以上の補強繊維は一つまたは二つ以上の組合で形成されることができる。
このような縒られた糸（Ｙａｒｎ） 形態の補強繊維は単純に長さ方向で直線形態に配置されるのと比べて本発明の混成ＦＲＰ補強材に加えられるせんだん力に、より效率的に対応することができ、等しい量を基準として、より大きい破断伸率を確保することができるという長所がある。
また繊維補強ポリマー体（１２０）は板の形状の内部芯材（１１０）のまわりを全体的に螺旋形で取り囲むように形成されることができ、この場合は混成ＦＲＰ補強材をシートまたは板の形態で本発明を利用する場合である。
即ち、本発明の混成ＦＲＰ補強材（１００）は板（Ｐｌａｔｅ）の形態及びバー（Ｂａｒ）の形態、その他の多くの形態で製作、利用されることができる。
That is, the inner core material (110) of the present invention is hybridized by increasing the deformation rate and deforming the physical shape (decreasing the cross-sectional area or diameter due to the transmitted internal pressure) without burdening the stress after yielding. The FRP reinforcing material has a function of causing a soft fracture behavior in response to an external load.
The fiber-reinforced polymer body (120) is wrapped around the inner core material (110) in a spiral shape in the form of yarn (Yarn) in which carbon fiber, aramid fiber, glass fiber or the like is wound as FRP reinforcing fiber. It is formed. Further, the three or more types of reinforcing fibers may be formed of one or two or more combinations.
Such a woven yarn-shaped reinforcing fiber is more effective to the force applied to the hybrid FRP reinforcing material of the present invention than simply being arranged in a linear shape in the length direction. There is an advantage that a larger elongation at break can be secured based on the same amount.
The fiber-reinforced polymer body (120) may be formed so as to surround the inner core (110) in the form of a plate as a whole in a spiral manner, in which case the hybrid FRP reinforcement is attached to the sheet or plate. This is a case where the present invention is used in a form.
That is, the hybrid
図７は本発明の混成ＦＲＰ補強材（１００）はバー（Ｂａｒ）の形態で所定の長さを有するように製作し、まるで鉄棒または鋼燃線を含む ＰＳＣ（Ｐｒｅｓｔｒｅｓｓｅｄ Ｃｏｎｃｒｅｔｅ） 鋼材のように両端部が油圧のジャッキのような引張手段によって引張された後、固定手段（２００）によって構造物（３００）に固定された状態を図示する。 FIG. 7 shows that the hybrid FRP reinforcement (100) of the present invention is manufactured to have a predetermined length in the form of a bar, and both ends are like a PSC (Prestressed Concrete) steel material including a steel bar or a steel fuel wire. A state in which the part is pulled by a pulling means such as a hydraulic jack and then fixed to the structure (300) by the fixing means (200) is shown.
この時、前記混成ＦＲＰ補強材（１００）の両端部は固定する手段（２００）を構成するコーン形状のウェッジ（２１０）によって固定具（２２０）に固定される。 本発明の混成ＦＲＰ補強材（１００）の内部芯材（１１０）は中空管形態に形成されて、前記固定時、端部に応力が局所的に集中されて結果的に内部芯材（１１０）の端部の破損される現象が発生する恐れがある。本発明ではそれを防止するため、内部芯材（１１０）の両端部に形成された中空に充填材（１３０）を形成させる。
前記充填材（１３０）は金属製または非金属製の棒を利用するか、或いは比較的に直径が小さな内部芯材の中空管に充填が容易くなるようにゲルの形態で存在していて、時間の経過、または加熱によって硬化される材料を利用することができ、望ましくはフッ素樹脂（ＰＴＦＥ（Ｐｏｌｙ Ｔｅｔｒａ Ｆｌｕｏｒｏ Ｅｔｈｙｌｅｎｅ）、ＦＥＰ（Ｆｌｏｕｒｉｎａｔｅｄ Ｅｔｈｙｌｅｎｅ Ｐｒｏｐｈｙｌｅｎｅ）、ＰＦＡ（Ｐｅｒ Ｆｌｕｏｒｏ Ａｌｋｏｘｙ））のような材質の充填材を利用することが望ましい。
At this time, both ends of the hybrid FRP reinforcing material (100) are fixed to the fixture (220) by a cone-shaped wedge (210) constituting the fixing means (200). The inner core material (110) of the hybrid FRP reinforcing material (100) of the present invention is formed in a hollow tube shape, and stress is locally concentrated at the end during the fixing, resulting in an inner core material (110). ) May be damaged. In the present invention, in order to prevent this, the filler (130) is formed in the hollow formed at both ends of the inner core (110).
The filler (130) may be a metal or non-metallic rod, or may be present in the form of a gel so that the hollow tube of the inner core having a relatively small diameter can be easily filled. A material that is cured over time or by heating can be used, and preferably a material such as fluororesin (PTFE (Poly Tetra Fluoro Ethylene), FEP (Florated Ethylene Prophylene), PFA (Per Fluoro Alkyoxy)). It is desirable to use a filler.
以上、本発明の実施例によって詳細に説明したが、本発明はこれに限定されず本発明が属する技術分野において通常の知識を有するものであれば本発明の思想と精神を離れることなく、本発明を修正または変更できる。 As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited thereto, and the present invention can be used without departing from the spirit and spirit of the present invention as long as it has ordinary knowledge in the technical field to which the present invention belongs. The invention can be modified or changed.
本発明の繊維補強ポリマー体及び内部芯材を含む混成ＦＲＰ補強材はコンクリート構造物を建設する時、鉄筋または鋼燃線を代替することができる補強材として利用され、特にコンクリート構造物（ビーム、桁、補強板など）に引張応力が発生する部分に一定な収容溝を形成させ、収容溝の内部に本発明のＦＲＰ補強材を埋め立てた後、エポキシ樹脂などのような充填材で締めくくったり、コンクリート構造物の下部面に本発明の混成ＦＲＰ補強材を付着させる方式を利用すると、コンクリート構造物に外部荷重が作用して特定部位に引張応力が発生する場合、前記混成ＦＲＰ補強材が引張応力を負担するようになり、その破壊挙動を軟性破壊挙動に誘導することができる。さらに、本発明の混成ＦＲＰ補強材はコンクリート構造物のたわみが発生して、このようなたわみを補償することができる構造物の補強材として利用することが可能である。 The hybrid FRP reinforcing material including the fiber reinforced polymer body and the inner core material of the present invention is used as a reinforcing material capable of replacing a reinforcing bar or a steel fuel wire when constructing a concrete structure, and particularly, a concrete structure (beam, A constant accommodation groove is formed in a portion where tensile stress is generated in a girder, a reinforcing plate, etc., and the FRP reinforcing material of the present invention is buried in the inside of the accommodation groove, and then tightened with a filler such as an epoxy resin, When the hybrid FRP reinforcing material of the present invention is applied to the lower surface of a concrete structure, when the external load acts on the concrete structure and a tensile stress is generated at a specific part, the hybrid FRP reinforcing material has a tensile stress. The fracture behavior can be induced to the soft fracture behavior. Furthermore, the hybrid FRP reinforcing material of the present invention can be used as a reinforcing material for a structure capable of compensating for such a deflection when a deflection of the concrete structure occurs.
１００ 混成ＦＲＰ補強材
１１０ 内部芯材
１２０ 繊維補強ポリマー体
１３０ 充填材
２００ 固定手段
２１０ ウェッジ
２２０ 固定具
３００ 構造物
DESCRIPTION OF
Claims (3)
前記内部芯材は繊維補強ポリマー体より降伏強度が低い中空管に形成され、
前記繊維補強ポリマー体は内部芯材のまわりを繊維補強ポリマー材質の縒られた糸（Ｙａｒｎ）を利用して全体的に内部芯材を螺旋形態でくるむように配置されることを特徴とする混成繊維補強ポリマー補強材。 As a reinforcing material for a structure including a fiber-reinforced polymer body arranged so as to surround an inner core material,
The inner core is formed in a hollow tube having a lower yield strength than the fiber-reinforced polymer body,
The fiber reinforced polymer body is arranged so that the inner core material is entirely wrapped in a spiral shape by using a yarn (Yarn) made of a fiber reinforced polymer material around the inner core material. Reinforced polymer reinforcement.
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| WO2008108053A1 (en) * | 2007-03-02 | 2008-09-12 | Sumitomo (Sei) Steel Wire Corp. | Strand |
| JP2008248675A (en) * | 2007-03-02 | 2008-10-16 | Sumitomo Denko Steel Wire Kk | Strand |
| US7886490B2 (en) | 2007-03-02 | 2011-02-15 | Sumitomo (Sei) Steel Wire Corp. | Strand |
| JP2009114596A (en) * | 2007-11-09 | 2009-05-28 | Sumitomo Denko Steel Wire Kk | Tubular strand and method for producing the same |
| JP2009138365A (en) * | 2007-12-04 | 2009-06-25 | Sumitomo Denko Steel Wire Kk | Polygonal strand and its manufacturing process |
| JP2012117324A (en) * | 2010-12-02 | 2012-06-21 | Shimizu Corp | Junction method between concrete structures |
| CN104060765A (en) * | 2014-06-16 | 2014-09-24 | 四川航天五源复合材料有限公司 | Steel-continuous-fiber composite bar and preparation method thereof |
| CN104060767A (en) * | 2014-06-19 | 2014-09-24 | 四川航天五源复合材料有限公司 | Method of industrially preparing steel-continuous-fiber composite bar |
| CN104060768A (en) * | 2014-06-19 | 2014-09-24 | 四川航天五源复合材料有限公司 | Industrial preparation method of steel-continuous-fiber composite bar with rib texture |
| WO2018008652A1 (en) * | 2016-07-06 | 2018-01-11 | 三菱重工業株式会社 | Composite material, pultrusion device, and pultrusion method |
| US11752710B2 (en) | 2016-07-06 | 2023-09-12 | Mitsubishi Heavy Industries, Ltd. | Composite material, pultrusion device, and pultrusion method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100535217B1 (en) | 2005-12-08 |
| KR20040108231A (en) | 2004-12-23 |
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