碳纤维与混凝土界面粘结应力计算方法

程永春; 李春良; 刘寒冰; 王波

碳纤维与混凝土界面粘结应力计算方法

吉林大学交通学院, 吉林长春 130022

基金项目:

交通部联合攻关项目 2003353322100

吉林省科技攻关项目 20040511

详细信息

作者简介:
程永春(1961-), 男, 吉林长春人, 吉林大学教授, 从事路面材料研究

中图分类号: U441.5;TU377
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- 文章访问数: 279
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- PDF下载量: 264
- 被引次数: 0
出版历程
- 收稿日期: 2006-12-11
- 刊出日期: 2007-04-25

Computation method of interfacial stresses between CFRP and concrete

School of Transportation, Jilin University, Changchun 130022, Jilin, China

More Information

Author Bio:
Cheng Yong chun(1961-), male, professor, +86-431-85095446, chengyc@jlu.edu.cn

摘要

摘要: 为了确定碳纤维加固混凝土结构承载过程中胶层部位的剪应力分布规律, 判别碳纤维与混凝土界面间是否发生剥离破坏, 进行了碳纤维布加固混凝土构件的拉伸试验, 基于弹性理论, 推导了已知力作用下的任意点胶层界面剪应力与碳纤维正应力的计算方法。计算结果表明碳纤维与混凝土界面的剪应力、正应变的分布规律与试验结果相吻合, 计算方法有较高的精度, 计算得出胶层部位的极限剪切强度为3.96 MPa, 在实际工程中, 为防止剥离破坏的发生, 应确保胶层剪切应力小于此值。
- 桥梁工程 /
- 碳纤维 /
- 剥离破坏 /
- 粘结应力 /
- 拉伸试验
Abstract: In order to study the shear stress distribution law of adhesive layer and determine the debonding failure on CFRP (carbon fibre reinforced plastic) and concrete interface in concrete strengthened structure with CFRP, a tensile test with CFRP reinforced concrete specimen was maked out, and a calculation model of arbitrary point interfacial shear stress and strain was put forward based on elasticity theory.Computation result indicates that the computation result of stresses is coincidence with the test result, the model is feasible; the computation value of interfacial ultimate shear strength is 3.96 MPa, so the shear stress should be less than the value in order to prevent the debonding failure.
- bridge engineering /
- CFRP /
- debonding failure /
- interfacial stresses /
- tensile test

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图 1 试件

Figure 1. Specimen

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图 2 胶接部分的结构

Figure 2. Structure of cementation part

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图 3 受力状态

Figure 3. Mechanical states

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图 4 受力分析模型

Figure 4. Mechanical analysis model

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图 5 荷载与应变曲线

Figure 5. Curve of load and strain

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图 6 位置与应变曲线

Figure 6. Curve of location and strain

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图 7 结果对比曲线

Figure 7. Comparison curves of results

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表 1 材料性能

Table 1. Performances of materials

种类	厚度/mm	抗拉强度/MPa	弹性模量/GPa	剪切模量/GPa
CFRP	0.167	3500	235	—
环氧树脂	—	47.1	3.1	1.2

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表 2 拉应变

Table 2. Tensile strain με

载荷/kN	位置/mm
载荷/kN	0	40	80	120	160	200
6	1	12	16	17	25	113
8	3	19	24	25	39	159
10	8	28	32	35	54	219
12	16	43	56	88	112	381
14	80	99	90	132	242	667
16	95	117	120	202	281	1459

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