BEHAVIOR OF CRACK IN CONCRETE REINFORCED BY GRID-TYPE CARBON FIBER NET

网格型碳纤维网增强混凝土的裂缝行为

• 批准号: 05650436
• 负责人: MAKIZUMI Tatsunori
• 金额: $ 1.34万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650436/
• 关键词: Carbon fiber; Continuous fiber reinforcement; Crack; Control of cracking; Anchorage; Effect of grid; コンクリート; 繊維補強材; 炭素繊維ネット

(1) Method for tensile test to examine the properties of Carbon Fiber NetTo examine the bihavior of crack in concrete reinforced by Carbon Fiber Net, it is necessary to understand the characteristics of materials and anchorage mechanism of fiber reinforcement. So the methods of bending test using beams with notch at the center of specimen was examined to understand them. As the results, it was possible to understand the characteristics of the materials and the anchorage mechanism by using the testing method like the case of direct tensile tests.(2) Study on distribution of strain of Carbon Fiber Net in concreteStrain characteristics of Carbon Fiber Net was studied by the above method under tensile loads. At first, strain gauges were attached to the center of longitudinal fiber within some meshes. In order to measure the resistance force in the transverse fibers, the longitudinal fiber strain in each mesh was measured. While the load was increasing, the changes of fiber strain were meas … More ured.As the results are as follows :a) Resistance forces were transferred to next transverse fiber in order.b) The existence of transverse fibers that aren't necessary for anchoring don't influence the behavior of strain.c) If fiber reinforcements have the scattering of strains, they rupture with keeping the scattering.(3) Expression of equation that shows the anchorage mechanism of Carbon Fiber NetThe properties of strains were tried to understand quantitatively by using elastic spring model that express the effect of the grid. In this paper, to express correctly the real properties with reference to elastic spring model that suggested in the study of the past, the resistance of transverse fiber was used to the model. And this study made the following condition "If the resistance exceeds the ultimate, a displacement of grid's intersection point grow". That condition made it possible to calculate the strain that reduced like a stair. In future, we will investigate the calculating crack width by using this theory. Less

(1)用拉伸试验检验碳纤维网性能的方法为了检验碳纤维网加固混凝土的裂缝行为，需要了解材料的特性和纤维加固的锚固机理。因此，对使用试样中心有缺口的梁进行弯曲试验的方法进行了研究，以了解它们。结果表明,采用与直接拉伸试验类似的试验方法可以了解材料的特性和锚固机理。(2)碳纤维网在混凝土中应变分布的研究采用上述方法研究了碳纤维网在拉伸荷载作用下的应变特性。首先，将应变计连接到一些网格内的纵向纤维的中心。为了测量横向纤维中的阻力，测量每个网格中的纵向纤维应变。当载荷增加时，测量纤维应变的变化。结果如下：a) 阻力按顺序传递到下一个横向纤维。b) 锚固不需要的横向纤维的存在不影响应变行为。c) 如果纤维增强材料存在应变分散，则在保持分散的情况下破裂。(3) 显示碳纤维网锚固机制的方程表达式 试图通过使用表达网格效应的弹性弹簧模型来定量地理解应变的特性。本文为了正确表达真实性能，参考以往研究中提出的弹性弹簧模型，在模型中采用了横向纤维的阻力。本研究提出了“如果阻力超过极限，网格交点的位移就会增大”的条件。这种条件使得计算像楼梯一样减小的应变成为可能。今后我们将研究利用该理论计算裂缝宽度。较少的

项目成果

長島玄太郎: "格子状炭素繊維補強材のコンクリート中でのひずみ性状" 平成6年度土木学会西部支部研究発表会講演概要集. 712-713 (1995)

Gentaro Nagashima：“混凝土中晶格状碳纤维增强材料的应变特性”1994 年日本土木工程师学会西部分会研究报告摘要 712-713 (1995)。

長島玄太郎: "格子状炭素繊維補強材のコンクリート中でのひずみ性状" 平成5年度土木学会西部支部研究発表会講演概要集. 712-713 (1995)

Gentaro Nagashima：“混凝土中晶格状碳纤维增强材料的应变特性”1993 日本土木工程师学会西部分会研究报告摘要 712-713 (1995)。

丸目一弘: "丸鋼モデルによる炭素繊維ネットの定着性状に関する検討" 土木学会第49回年次学術講演会講演概要集. 第5部. 900-901 (1994)

Kazuhiro Marume：“使用圆钢模型研究碳纤维网的锚固性能”第49届日本土木工程学会学术年会摘要第5部分。900-901（1994）。

Kazuhiro MARUME: "STUDY ON PROPERTIES OF ANCHORAGE OF CARBON FIBER NET USING MODEL OF STEEL BAR" Proceedings of the annual meeting, JSCE Seibu-branch. 840-841 (1994)

Kazuhiro MARUME：“使用钢棒模型研究碳纤维网锚固性能”年会记录，JSCE 西武分会。

Hiroaki, TSURUTA: "EXPERIMENTAL STUDY ON BEHAVIOR OF SHARE TENSILE FORCE BY USING CARBON FIBER NET" Proceedings of the Japan Concrete Institute. Vol.16, No.1. 1191-1196 (1994)

Hiroaki, TSURUTA：“使用碳纤维网进行共享张力行为的实验研究”日本混凝土协会会议录。