预应力芳纶纤维布加固混凝土梁抗弯性能试验及理论分析

邓宗才; 李建辉

doi:10.13204/j.gyjz200710027

预应力芳纶纤维布加固混凝土梁抗弯性能试验及理论分析

doi: 10.13204/j.gyjz200710027

1.
北京工业大学建筑工程学院北京 100022

基金项目:

国家自然科学基金资助项目(50678011);北京市教委资助项目(KM20010005007)

详细信息

作者简介:
邓宗才男 1961年12月出生教授博士生导师

中图分类号: TU375.1
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- 文章访问数: 67
- HTML全文浏览量: 8
- PDF下载量: 43
- 被引次数: 0
出版历程
- 收稿日期: 2006-11-13
- 刊出日期: 2007-10-20

EXPERIMENT AND THEORETICAL RESEARCH ON FLEXURAL PERFORMANCE OF RC BEAMS STRENGTHENED WITH PRESTRESSED AFRP SHEETS

1.
School of Civil Engineering,Beijing University of Technology Beijing 100022

摘要

摘要: 预应力技术是充分发挥FRP复合材料高强性能的一条有效途径。通过对预应力芳纶纤维布加固混凝土梁抗弯的试验,对预应力水平对梁抗弯承载力、刚度、延性的影响进行分析。结果表明:预应力水平为55%~65%时,预应力芳纶纤维布加固梁的开裂、屈服、极限荷载比非预应力芳纶纤维布加固梁分别提高约147%~165%、28%~50%、13%~31%,表明预应力芳纶纤维布能显著地提高混凝土梁的抗弯性能。承载力极限状态时,预应力梁为纤维布的断裂破坏,非预应力梁发生布与混凝土间局部脱粘破坏。在试验研究的基础上,采用弹塑性截面分析法计算梁的承载力,理论计算值与试验值吻合良好。
- 芳纶纤维布 /
- 预应力 /
- 力学性能 /
- 混凝土
Abstract: Prestress technology is an effective way to use the high strength of FRP composite. The experimental study onflexural performance of strengthening RC beams using prestressed aramid fiber reinforced plastic (AFRP) sheets isconducted, and the effects of different prestress level on the propertiesof flexural load, stiffness and ductility are analyzed.Results show that, when prestress level is 55%～ 65%, the cracking load, yield load and ultimate load of RC beamsstrengthened with prestressed AFRP sheets are 147%～ 165%, 28%～ 50%, 13%～ 31% larger than that of RC beamsstrengthened with non -prestressed AFRP sheets, validating the effectiveness of prestressed AFRP sheet retrofit.The failurepattern of prestressed AFRP sheets is fracture, but that of non-prestressed AFRP sheets is debonding.Based on theexperimental study, an elastoplastic section analysis method is conducted to predict the loads of beams, the results from thetheoretical predictions and the experiment agree well.
- AFRP sheets /
- prestressed /
- mechanical properties /
- concrete

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参考文献(7)

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.张建伟, 邓宗才, 杜修力, 等. 芳纶纤维布加固钢筋混凝土梁的抗弯性能. 特种结构, 2005, 22(4): 90-92

.张建伟, 杜修力, 邓宗才, 等. 预应力芳纶纤维布加固混凝土梁的受弯性能研究. 建筑结构学报, 2006,27(5 ): 101-109

.王文炜, 盛波, 李果. 玻璃纤维布加固的钢筋混凝土梁延性分析. 东南大学学报, 2005, 35(4): 569-573

.邓宗才. 碳纤维布增强钢筋混凝土梁抗弯力学性能研究. 中国公路学报, 2001, 14(2): 45-51

.GB 50010 -2002 混凝土结构设计规范

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