Strengthening of Concrete Members Using External Prestressing Fiber Sheet

体外预应力纤维板加固混凝土构件

• 批准号: 07805044
• 负责人: SHIMURA Kazunori
• 金额: $ 1.34万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07805044/
• 关键词: Fiber sheet; Prestressing sheet; Aramid fiber; Carbon sheet; Bond; Paste; Web strengthening; Peeling; ウェブ補強

The method for maintenance and strengthening reinforced concrete members using prestressing fiber sheet was investigated. Carbon sheets and aramid sheets were used as prestressing tendon. The bond behavior between concrete and sheet and flexural-shearing behavior of reinforced concrete beam pasted the web with prestressed fiber sheet were evaluated by experiments. Following conclusions were obtained from experiments.1. The effective length from load applying end toward fixed end is about 10cm.2. The effective bond area with peeling-shear failure is the right-angled triangle surrounded by diagonal crack and upper half of the lateral line of the cross section.3. As pasting with prestressing sheet, both flexural strength and shearing strength of beams improved.4. Specimens with artificial cracks showed lower strength compared with specimens without cracks, however, specimens with artificial cracks strengthened by prestressing sheet showed to improve strength up to strengthened specimen without cracks.5. The conventional prestressed concrete theory is applicable for predicting flexural strength.6. The truss theory is applicable for predicting shearing strength of member by regarding bond strength between sheet and concrete as shear strength of concrete.

研究了使用预应力纤维板维护和增强钢筋混凝土构件的方法。碳片和芳香片被用作预应力肌腱。通过实验评估了混凝土和薄板之间的粘结行为以及用预应力纤维板粘贴的钢筋混凝土束的弯曲行为。从实验中得出以下结论。1。从负载施加到固定端的有效长度约为10厘米。剥离剪切破坏的有效粘结面积是右角三角形，周围是对角线裂纹和横截面侧线的上半部分。3。随着预应力板的粘贴，梁的弯曲强度和剪切强度得到了改善。4。与没有裂缝的标本相比，具有人造裂纹的标本显示出较低的强度，但是，通过贴剂板增强了具有人造裂纹的标本，可以提高强度，从而提高强度，直至没有裂缝的增强标本。5。常规预应力的混凝土理论适用于预测弯曲强度6。桁架理论适用于通过将薄板和混凝土之间的粘结强度作为混凝土的剪切强度来预测成员的剪切强度。

项目成果

佐伯昇: "アラミドロープを用いた外ケーブルPRC桁の挙動" コンクリート工学年次論文報告集. 15. 777-782 (1993)

Noboru Saeki：“使用芳纶绳的外索 PRC 梁的行为”混凝土工程年论文集 15. 777-782 (1993)。

甄暁青: "アラミド繊維シートを緊張材として用いたPRC桁の耐力" 土木学会第51回年次学術講演会講演概要集. V. 934-935 (1996)

甄晓庆：“使用芳纶纤维片作为受拉材料的PRC梁的证明强度”日本土木工程学会第51届年会学术会议摘要V.934-935（1996）。

Zen, Xiaoqing: "Strength of PRC Beam Using Prestressing Aramid Fiber Sheet" Proc.of Annual Conference of JSCE. 5. 934-935 (1996)

曾小青：《预应力芳纶纤维板PRC梁的强度》中国建筑学会年会论文集。

Zen, Xiaoqing: "Strengthening of Prestressed Reinforced Concrete Beam with Aramid Sheet" Proc.of Hokkaido Chapter of JSCE. 52 (A). 694-699 (1996)

禅小青：“用芳纶片材加固预应力钢筋混凝土梁”日本建筑学会北海道分会论文集。

出雲健司: "アラミド繊維シートを緊張材として用いたPRC部材の曲げ・せん断補強効果" 新素材のコンクリート構造物への利用シンポジウム論文報告集. 141-146 (1996)

Kenji Izumo：“PRC构件使用芳纶纤维片作为筋的弯曲和剪切加固效果”混凝土结构新材料使用研讨会论文集141-146（1996）。