表层嵌入预应力碳纤维筋混凝土梁抗弯试验研究

徐平; 曾宪桃; 丁亚红; 王兴国

doi:10.13204/j.gyjz201203015

表层嵌入预应力碳纤维筋混凝土梁抗弯试验研究

doi: 10.13204/j.gyjz201203015

1.
河南理工大学土木工程学院,河南焦作 454003

基金项目:

国家自然科学基金项目(51108161);河南省重点科技攻关项目(082102240009);河南省教育厅自然科学研究计划项目(2011A560004);河南理工大学青年基金(Q2006-12)

详细信息

作者简介:
徐平，男，1981年出生，硕士，讲师。E-mail:xuping@hpu.edu.cn

计量
- 文章访问数: 63
- HTML全文浏览量: 6
- PDF下载量: 90
- 被引次数: 0
出版历程
- 收稿日期: 2011-05-30
- 刊出日期: 2012-03-20

EXPERIMENTAL RESEARCH ON FLEXURAL BEHAVIOR OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH NEAR SURFACE MOUNTED PRESTRESSED CFRP TENDONS

1.
School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China

摘要

摘要: 为了充分发挥碳纤维增强塑料(CFRP)筋的高强性能,更有效提高加固梁的力学性能,通过在混凝土梁受弯区表层开20 mm20 mm的槽后,对直径为7 mm的CFRP筋施加不同水平的预应力并嵌入开好的槽中,并用专用结构胶填充槽道,待结构胶固化后进行加固梁的抗弯试验。通过对9根表层嵌入预应力CFRP筋加固梁和1根未加固梁的抗弯加载试验,初步研究了加固梁的刚度、特征荷载、延性及梁的裂缝发展与破坏模式。研究表明,预应力CFRP筋的高强性能得到充分发挥,加固梁的刚度显著提高,开裂荷载最大提高了303.17%,极限承载能力最大提高237.92%,延性基本能满足抗震要求,破坏模式表现为3种形式。
- CFRP筋 /
- 加固 /
- 预应力 /
- 混凝土梁
Abstract: In order to make full use of the high-strength performance of CFRP tendons,the different prestress was applied to 7 mm diameter CFRP tendons put on to 20 mm20 mm grooves opened on the concrete surface of the tensile region of concrete beams.Flexural behavior of nine RC beams strengthened with prestressed near surface mounted CFRP tendons applied different levels of prestress and that of one unstrengthened RC beam were studied.In these tests,stiffness,characteristic load,crack development and ductility of test specimens were carried out.Experimental results show that the high-strength performance of CFRP is fully used,the stiffness of strengthened beams is risen notably,the maximal crack load is increased by 303.17%,the maximal ultimate load is increased by 237.92%,the ductility of beams can approximately meet the requirements of anti-earthquake design,and failure has three expressional forms.
- CFPR tendons /
- reinforcement /
- prestress /
- concrete beam

HTML全文

参考文献(16)

赵稼祥. 2008世界碳纤维前景会[J].高科技纤维与应用,2008,(05):1-6.

Taljsten B,Cordin H. Concrete Structures Strengthened with Near-Surface Mounted Reinforcement of CFRP[J].Advances inStructural Engingeering,2002,(03):201-213.

岳清瑞,李庆伟,杨勇新. 纤维增强复合材料嵌入式加固技术[J].工业建筑,2004,(04):1-4.

周朝阳,李毅卉,贺学军. T形截面钢筋混凝土梁内嵌FRP加固后抗弯承载力计算[J].铁道科学与工程学报,2005,(04):50-53.

王兴国. 预应力纤维片材加固混凝土梁抗弯性能研究[D].长沙:中南大学,2007.

王天稳,尹志强. FRP筋NSM加固混凝土构件二次受力时抗弯承载力计算方法[J].武汉大学学报(工学版),2005,(04):55-58.

成香莉. 内嵌碳纤维增强塑料板条抗弯加固混凝土梁试验研究[D].焦作:河南理工大学,2006.

张雪丽. 嵌入碳纤维增强塑料板条加固混凝土梁抗剪性能试验研究[D].焦作:河南理工大学,2006.

Bob Sweet. Composites Past,Present and Future[M].CompositesTechnology,2002.

Parretti R,Nanni A. Strengthening of RC Members Using Near-Surface Mounted FRP Composites Design Overview[J].Advancesin Structural Engineering,2004,(05):469-483.

Adili Al Mayah,Khaled A Soudk. Experimental and AnalyticalInvestigation of a Stainless Steel Anchorage for CFRP PrestressingTendons[J].PCI Journal,2001,(3-4):88-100.

Almayah A,Soudki K. Mechanical Behavior of CFRP RodAnchors Under Tensile Loading[J].Journal of Composites forConstruction,2001,(05):128-135.

蒋田勇,方志. CFPR预应力夹片式锚具的试验研究[J].土木工程学报,2008,(02):60-69.

丁亚红. 内嵌预应力筋材加固混凝土梁弯曲性能研究[D].焦作:河南理工大学,2009.

徐平. 内嵌预应力CFRP筋混凝土梁抗弯试验及其锚固体系研究[D].焦作:河南理工大学,2009.

混凝土结构设计规范[S].2002.

施引文献

资源附件(0)

访问统计