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Development of Bond Test Method for Continuous Fiber Sheet

连续纤维片材粘合力测试方法的开发

基本信息

批准号：
10650448
负责人：
MARUYAMA Kyuichi
金额：
$ 2.24万
依托单位：
NAGAOKA UNIVERSITY OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650448/
关键词：
Continuous Fiber Sheet Test Method for Bond Concrete Bond Stress Relative Displacement Constitutive Equation Carbon Fiber Aramid Fiber

项目摘要

In order to develop a test method for bond between continuous fiber sheet (CF Sheet) and concrete, it has been examined whether the bond properties of the sheet and concrete can be appropriately measured with use of a hexahedron block of concrete. Through the experimental work, it is found out that measurement of the strain distribution in a sheet by attached strain gages can show the bond stress distribution and peeling off with adequate accuracy during loading. In addition, the influences of the property of sheet (modulus of elasticity), properties of adhesion materials and concrete strength were evaluated quantitatively.Since the peeling off phenomenon can be defined as bond failure, concrete strength must affect the phenomenon. The test results, however, showed that the relationships between bond stress and relative displacement were almost identical while concrete strength was varied from 24 to 60 kN/mmィイD12ィエD1. It was considered that the surface properties of concrete were hardly changed in the range of above concrete strength. This was true for either case of carbon fiber and aramid fiber. However, the modulus of elasticity of adhesion resin affected greatly on the bond behavior. When the low modulus of elasticity of resin is used, the stress transfer length becomes longer and may result in fiber fracture instead of peeling off.Based on the bond stress - relative displacement relationships, it was developed how to determined the proper amount of continuous fiber sheet for strengthening the shear capacity of ordinary RC beams. The effectiveness of the proposed method was examined by comparison with test results.Through the research work it is concluded that the proposed test method for the bond of continuous fiber sheet and concrete can show sufficient as a standard test method.

为了开发连续纤维片材（CF片材）与混凝土之间的粘结的测试方法，已经研究了片材与混凝土的粘结性能是否可以使用混凝土的六面体块适当地测量。通过实验研究发现，用应变片测量薄板的应变分布，可以准确地反映加载过程中的粘结应力分布和剥离情况。此外，定量地评价了片材性能（弹性模量）、粘结材料性能和混凝土强度对粘结强度的影响，由于剥离现象可以定义为粘结破坏，因此混凝土强度必然会影响剥离现象。试验结果表明，当混凝土强度在24 ~ 60 kN/mm范围内变化时，粘结应力与相对位移的关系基本相同。认为在上述混凝土强度范围内，混凝土的表面性质基本不变。这对于碳纤维和芳纶纤维的任何一种情况都是正确的。而粘接树脂的弹性模量对粘接性能影响较大。采用低弹性模量的树脂材料时，纤维的应力传递长度变长，可能导致纤维断裂而非剥离，基于粘结应力-相对位移关系，提出了如何确定普通钢筋混凝土梁抗剪承载力的连续纤维布的合理用量。通过与试验结果的对比，验证了本文方法的有效性，认为本文方法可以作为连续纤维布与混凝土粘结强度的标准试验方法。