JPS62290503A - Method of reducing pure relaxation rate of stretching material made of fiber-reinforced composite material for prestressed concrete - Google Patents
Method of reducing pure relaxation rate of stretching material made of fiber-reinforced composite material for prestressed concreteInfo
- Publication number
- JPS62290503A JPS62290503A JP61133811A JP13381186A JPS62290503A JP S62290503 A JPS62290503 A JP S62290503A JP 61133811 A JP61133811 A JP 61133811A JP 13381186 A JP13381186 A JP 13381186A JP S62290503 A JPS62290503 A JP S62290503A
- Authority
- JP
- Japan
- Prior art keywords
- tensile force
- fiber
- reinforced composite
- tension
- relaxation rate
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims description 34
- 239000003733 fiber-reinforced composite Substances 0.000 title claims description 11
- 239000011513 prestressed concrete Substances 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 9
- 210000002435 tendon Anatomy 0.000 claims description 19
- 230000007423 decrease Effects 0.000 description 7
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011208 reinforced composite material Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
３、発明の詳細な説明
（産業上の利用分野）
本発明は、プレストレストコンクリート用繊維強化複合
材料製緊張材の純レラクセーション率低減方法に関する
ものである。Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for reducing the net relaxation rate of tendons made of fiber-reinforced composite materials for prestressed concrete.
（従来技術）
近年、防食性に優れかつ高強度を有する炭素繊維やアラ
ミド１１雑などの各種繊維を用いた複合材料を、プレス
トレストコンクリートの緊張材として利用しようという
気運が高まっている。(Prior Art) In recent years, there has been a growing trend to use composite materials using various fibers such as carbon fiber and aramid 11 miscellaneous, which have excellent corrosion resistance and high strength, as tension materials for prestressed concrete.
しかし、ｍ雑強化複合材料はＰＣ鋼材と同様に、与えら
れた引張力がｖｉ間の経過と共に減少していくレラクセ
ーション特性を有しており、ｕＡ謂強１ヒ複合材料はＰ
ＣＩＪＡ材に比べてレラクセーション率が大きいと言わ
れている。そのため、このような繊維強化複合材料をプ
レストレストコンクリートに応用するに当っては、レラ
クセーションによる緊張力の大きな減少出を予め緊張力
導入時に見込む必要があるし、また時間の経過とともに
部材断面に与えられたプレストレスが徐々に減少するこ
とになる。However, similar to PC steel materials, m miscellaneous reinforced composite materials have a relaxation property in which the applied tensile force decreases with the passage of time vi, and uA so-called strong 1 h composite materials have
It is said to have a higher relaxation rate than CIJA wood. Therefore, when applying such fiber-reinforced composite materials to prestressed concrete, it is necessary to anticipate a large decrease in tension due to relaxation when introducing tension, and also to allow for a significant decrease in tension in the cross section of the member over time. The applied prestress will gradually decrease.
例えば、一方向Ｉｌ維強化プラスチック（以下、一方向
強化ＦＲＰという）の３０年後における純レラクセーシ
ョン率は１４％にも及び、その純レラクセーション曲線
は対数時間軸に対して直線状となることが報告されてい
る。即ち、レラクセージョンは時間の経過と共に進行す
ることになる。For example, the net relaxation rate of unidirectional Il fiber-reinforced plastic (hereinafter referred to as unidirectionally reinforced FRP) after 30 years is as high as 14%, and its net relaxation curve is linear with respect to the logarithmic time axis. It has been reported that this will happen. That is, relaxation progresses over time.
（発明が解決しようとする問題点）
このような繊維強化複合材料をプレストレストコンクリ
ートの緊張材の応用すると、次のような問題点が生じる
。(Problems to be Solved by the Invention) When such fiber-reinforced composite materials are applied as tendons for prestressed concrete, the following problems arise.
構造物の耐用年数終了時（例えば、３０年後、５０年後
）においても安全上必要な緊張力を維持するためには、
レラクセーシジンに伴う緊張力の大きな減少量を考慮し
て、予め大きな初期緊張力を導入する必要がある。その
ため、定着端部において支圧力に対する補強をより強固
にしなければならない問題点がある。更に、初期緊張力
の導入時においては外力に対して過分な緊張力が導入さ
れているため、緊張材もその断面が不経済な断面となら
ざるを得ない問題点があった。In order to maintain the necessary tension for safety even at the end of a structure's service life (for example, after 30 or 50 years),
In consideration of the large reduction in tension associated with Relaxesidine, it is necessary to introduce a large initial tension in advance. Therefore, there is a problem in that the fixing end must be reinforced more strongly against the bearing force. Furthermore, when the initial tension force is introduced, an excessive tension force is introduced relative to the external force, so there is a problem that the cross section of the tendon material must be an uneconomical cross section.
本発明の目的は、ｉｌ維強化複合材料製緊張材の純レラ
クセーション率を低減することができるプレストレスト
コンクリート用繊維強化複合材料製緊張材の純レラクセ
ーション率低減方法を提供することにある。An object of the present invention is to provide a method for reducing the net relaxation rate of tendons made of fiber-reinforced composite materials for prestressed concrete, which can reduce the net relaxation rate of tendons made of fiber-reinforced composite materials. .
（Ｂ照点を解決するための手段）
上記の目的を達成するための本封明のプレストレストコ
ンクリート用繊維強化複合材料製緊張材の純レラクセー
ション率低減方法は、ｌｓ維強化複合材料製緊張材に、
定着前に引張力を与え、その引張力が定着時の目標引張
力に達したら、その引張力を所定時開保持するか若しく
はその引張力をゆるめて繰返し前記目標引張力までの載
荷を与えて前記緊張材に応力履歴を予め与えることを＃
Ｉ！ｌｉとする。(Means for Solving Point B) The method for reducing the net relaxation rate of fiber-reinforced composite material tendons for prestressed concrete in order to achieve the above purpose is as follows: To the material,
A tensile force is applied before fixing, and when the tensile force reaches the target tensile force during fixing, the tensile force is kept open for a predetermined time, or the tensile force is loosened and a load is repeatedly applied up to the target tensile force. # To give a stress history to the tendon material in advance
I! Let it be li.
（作用）
このように定着前に、プレストレストコンクリート用繊
維強化複合材料製緊張材に目標引張力を与えておくと、
レラクセーションによる応力減少量が低下する。(Function) In this way, if a target tensile force is applied to the fiber-reinforced composite material tendons for prestressed concrete before fixing,
The amount of stress reduction due to relaxation decreases.
（実施例） 以下、本発明の実施例を詳細に説明する。(Example) Examples of the present invention will be described in detail below.
本実施例では、プレストレストコンクリート用ＩＩｔｓ
強化複合材料製緊張Ｖｔ＜以下、ＦＲＰ緊張材という）
の純レラクセーション率を低減するため以下のいずれか
の方法を行う。In this example, IIts for prestressed concrete
Reinforced composite material tension Vt (hereinafter referred to as FRP tension material)
Do one of the following methods to reduce the net relaxation rate of:
（Ａ）定着前にＦＲＰ緊張材に引張りを与え、その引張
力が定着時の目標引張力に達したら、その引張力を長時
間保持することにより応力履歴を予め与えた後に定菅し
、コンクリート部材にプレス（−レスを４人する。この
引張力の保持時間が長いほどレラクセーションにょるＦ
ＲＰ緊張材の応力減少量が低下する。(A) Tension is applied to the FRP tension material before fixing, and when the tensile force reaches the target tensile force at the time of fixing, the tension is maintained for a long time to give a stress history in advance, and then the concrete is fixed. 4 people press (-res) the member.The longer this tensile force is held, the more relaxation will occur.F
The amount of stress reduction in RP tendons decreases.
（Ｂ）定着前に、ＦＲＰ緊張材に定着時の目標引張力ま
で応力ａＵを予め与えておく。この応力履歴の与え方と
しては、無負向状態から目標引張力までの軟菌を緩り返
す方法が考えられ、この負向−除イ４−負荷・・・の繰
り返しによる応力履歴をＦ ＲＰ ｇ張材に与えること
によってレラクセーションによる応力の減少を低減する
ことができる。(B) Before fixing, a stress aU is applied in advance to the FRP tension material up to the target tensile force at the time of fixing. One way to give this stress history is to slowly return the soft bacteria from a non-negative state to the target tensile force, and the stress history due to the repetition of this negative direction - removal 4 - load... is FRP. By applying g to the tension material, the reduction in stress due to relaxation can be reduced.
なお、前記（Ａ）（Ｂ）で述べたように、定着前にＦＲ
Ｐ緊張材に長時間の持続引張力を与えたり、繰返しの応
力履歴を与えるに際しては、現場においてコンクリート
部材中にＦＲＰｗ４張材を配置後の定着作業前に行って
もよく、或いは予め出荷前等に行ってもよい。In addition, as mentioned in (A) and (B) above, the FR
When applying a long-term sustained tensile force or repeated stress history to the P tension material, it may be done at the site before the fixing work after placing the FRPw4 tension material in the concrete member, or it may be done in advance before shipping. You can go to
本発明の方法の効果を確めるため純レラクセーション試
験を行った。この試験は、３つに大別でき、全試験ケー
スを示すと表−１のようになる。A pure relaxation test was conducted to confirm the effectiveness of the method of the present invention. This test can be roughly divided into three categories, and all test cases are shown in Table 1.
表−１
なお、載荷パターン（イ）は第１図に示し、載荷パター
ン（ロ）は第２図に示し、載荷パターン（ハ２は第３図
に示す。これらの図において、Ｐｉは目標引張力、Ｔ（
１１は載荷時間、７ ｂは引張力保持＆ｉ間である。第
３図における載荷パターン（ハ）における載荷・除狗速
度は、第１図及び第２図における載荷パターン（イ）及
び（ロ）ど同じである。また、ｆｉ−１におけるＰｉ
／Ｐｕは（目標引張力）／（緊張材の引張耐力）、ＡＦ
ＲＰはアラミド繊維強化複合材料、ＣＦＲＰは炭素繊維
強化複合材料である。Table-1 The loading pattern (A) is shown in Figure 1, the loading pattern (B) is shown in Figure 2, and the loading pattern (C2 is shown in Figure 3). In these figures, Pi is the target tensile strength. Power, T (
11 is the loading time, and 7b is the tensile force holding period &i. The loading/removal speed in the loading pattern (c) in FIG. 3 is the same as in the loading patterns (a) and (b) in FIGS. 1 and 2. Also, Pi in fi-1
/Pu is (target tensile force)/(tensile strength of tendon), AF
RP is an aramid fiber reinforced composite material, and CFRP is a carbon fiber reinforced composite material.
次に、引張力保持時間を０分及び１０分とした時のＡＦ
ＲＰ緊張材及びＣＦＲＰ％ｌ張材に対するレラクセーシ
ョン試験（試験Ｎ０．１）の結果を第４図及び第５図に
示す。第４図の場合の引張保持時間Ｔｈは０分、第５図
の場合の引張保持時間Ｔｈは１０分である。第４図より
ＣＦＲＰ緊張材においても、ＡＦＲＰ緊張材においても
、定着（Ｓ定開始）ｉｌｌｏ分間程度におけるレラクセ
ーション率は大きいことがわかる。しかし、第５図に示
すように引張力を１０分間保持することにより、レラク
セーション率を小さくできることがわかる。従って、本
発明のように、ＦＲＰ緊張材に与える引張力が目標引張
力に達した侵、その引張力を長時間保持するか或はその
目標引張力を繰返し与えることは、ＦＲＰ緊張材の純レ
ラクセーション率を低減する上で有効な方法である。Next, the AF when the tensile force holding time was set to 0 minutes and 10 minutes.
The results of the relaxation test (test No. 1) for the RP tension material and the CFRP%l tension material are shown in FIGS. 4 and 5. The tension holding time Th in the case of FIG. 4 is 0 minutes, and the tension holding time Th in the case of FIG. 5 is 10 minutes. From FIG. 4, it can be seen that both the CFRP tendon material and the AFRP tendon material have a large relaxation rate in about 10 minutes when fixing (S constant start). However, as shown in FIG. 5, it can be seen that the relaxation rate can be reduced by maintaining the tensile force for 10 minutes. Therefore, as in the present invention, when the tensile force applied to the FRP tendon reaches the target tensile force, maintaining that tensile force for a long time or repeatedly applying the target tensile force is a This is an effective method for reducing the relaxation rate.
次に、ＡＰＲＰＭ張材を用いて目標引張力と引張耐力と
の比ｐ＋ ／Ｐｕを５０％とした時の試験Ｎ００２及び
３の場合の結果と、試験Ｎ００１においｒｐｉ ／Ｐｕ
−５０％、Ｔｈ −０の場合の結果を併せて第６図に示
す。試験Ｎ００２及び３の試験と試験Ｎ０８１における
Ｔｈ −０分の場合の結果との比較より、ＦＲＰ緊張材
に応力履歴を予め与えておくことが純レラクセーション
率の低減に有効であることがわかる。Next, we will show the results of tests N002 and 3 when the ratio p+ /Pu between target tensile force and tensile strength is 50% using APRPM tensile material, and the results of rpi /Pu in test N001.
The results in the case of -50% and Th -0 are also shown in FIG. Comparing the results of Tests N002 and 3 with the results of Test N081 in the case of Th -0 minutes, it can be seen that giving a stress history to the FRP tendons in advance is effective in reducing the pure relaxation rate. .
（発明の効果）
以上説明したように本発明では、ＦＲＰ緊張材に応力履
歴を与えるようにしたので、該ＦＲＰ緊張材のレラクセ
ーションによる応力の減少口を低減することができる。(Effects of the Invention) As explained above, in the present invention, since a stress history is given to the FRP tendon material, it is possible to reduce the decrease in stress due to relaxation of the FRP tendon material.
このため、初期プレストレス導入時に、ＦＲＰ緊張材に
与える緊張力を小さくでき、ＦＲＰ緊張材の有する高強
度を有効に利用することができる。更に、本発明によれ
ば、初期緊張力を小さくできるため、その反力を受ける
定着部の補強も簡素化できる利点がある。Therefore, it is possible to reduce the tension force applied to the FRP tendon material when introducing initial prestress, and it is possible to effectively utilize the high strength of the FRP tendon material. Further, according to the present invention, since the initial tension force can be reduced, there is an advantage that the reinforcement of the fixing section that receives the reaction force can be simplified.
第１図乃至第３図は本発明の方法での３種の載荷パター
ンの例を示す説明図、第４図及び第５図は引張力保持時
間が０分と１０分の場合の各レラクセーション曲線図、
第６図は応力履歴の有無の場合の変化を示すレラクセー
ション曲線図である。
特 許 出 願 人 五洋建設株式会社第４図
第５図
１１０１０２ （三）FIGS. 1 to 3 are explanatory diagrams showing examples of three types of loading patterns in the method of the present invention, and FIGS. 4 and 5 show each relaxation when the tensile force holding time is 0 minutes and 10 minutes. sation curve diagram,
FIG. 6 is a relaxation curve diagram showing changes with and without stress history. Patent applicant: Pentayo Construction Co., Ltd. Figure 4 Figure 5 110102 (3)
Claims (1)
その引張力が定着時の目標引張力に達したら、その引張
力を所定時間保持するか若しくはその引張力をゆるめて
繰返し前記目標引張力までの載荷を与えて前記緊張材に
応力履歴を予め与えることを特徴とするプレストレスト
コンクリート用繊維強化複合材料製緊張材の純レラクセ
ーション率低減方法。Tensile force is applied to the tension material made of fiber-reinforced composite material before it is fixed.
When the tensile force reaches the target tensile force during fixing, the tensile force is maintained for a predetermined period of time, or the tensile force is loosened and a load is repeatedly applied up to the target tensile force to give the tension material a stress history in advance. A method for reducing the net relaxation rate of tendons made of fiber-reinforced composite materials for prestressed concrete, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61133811A JPS62290503A (en) | 1986-06-11 | 1986-06-11 | Method of reducing pure relaxation rate of stretching material made of fiber-reinforced composite material for prestressed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61133811A JPS62290503A (en) | 1986-06-11 | 1986-06-11 | Method of reducing pure relaxation rate of stretching material made of fiber-reinforced composite material for prestressed concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62290503A true JPS62290503A (en) | 1987-12-17 |
Family
ID=15113591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61133811A Pending JPS62290503A (en) | 1986-06-11 | 1986-06-11 | Method of reducing pure relaxation rate of stretching material made of fiber-reinforced composite material for prestressed concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62290503A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS481811A (en) * | 1971-05-20 | 1973-01-11 | ||
| JPS503417A (en) * | 1973-05-16 | 1975-01-14 | ||
| JPS5014456A (en) * | 1973-06-11 | 1975-02-15 |
-
1986
- 1986-06-11 JP JP61133811A patent/JPS62290503A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS481811A (en) * | 1971-05-20 | 1973-01-11 | ||
| JPS503417A (en) * | 1973-05-16 | 1975-01-14 | ||
| JPS5014456A (en) * | 1973-06-11 | 1975-02-15 |
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