表面内嵌FRP筋混凝土粘结-滑移本构关系试验研究

玻璃钢/复合材料 ›› 2016, Vol. 0 ›› Issue (3): 5-12.

• 基础研究 • 下一篇

表面内嵌FRP筋混凝土粘结-滑移本构关系试验研究

张海霞¹,何禄源²

1.沈阳建筑大学土木工程学院,沈阳110168;
2.河南省建筑科学研究院有限公司,郑州450053

收稿日期:2015-10-08 出版日期:2016-03-28 发布日期:2016-03-28
作者简介:张海霞(1976-),博士,副教授,主要从事新型FRP混凝土结构、结构性能加固、组合结构等领域的研究,iriszhx@163.com。
基金资助:
国家自然科学基金资助项目(51208316);辽宁省高等学校优秀科技人才支持计划项目(LR2015055);住房和城乡建设部研究开发项目(2014-K2-039)

EXPERIMENTAL STUDY ON BOND-SLIP BEHAVIOR BETWEENNSM FRP BARS AND CONCRETE

ZHANG Hai-xia¹, HE Lu-yuan²

1.School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China;
2.Henan Provincial Academy of Building Research, Zhengzhou 450053, China

Received:2015-10-08 Online:2016-03-28 Published:2016-03-28

摘要/Abstract

摘要： 通过对一组表面内嵌FRP筋混凝土试件进行拉拔试验,分析表面内嵌FRP筋混凝土的受力过程和破坏模式;研究FRP筋直径、粘结长度和FRP筋类型等因素对粘结滑移性能的影响。结果表明,试件的破坏模式表现为FRP筋与结构胶界面破坏、结构胶与混凝土界面剥离、FRP筋被拉断和结构胶劈裂四种破坏模式;内嵌BFRP筋试件的粘结应力随粘结长度的增长而增大,而内嵌GFRP筋试件的粘结应力随粘结长度的增长而减小。因FRP筋泊松比的降低和剪切滞后效应,试件的粘结应力随着FRP筋直径的增大而减小。同时,对试验结果进行处理分析,建立了一种适用于表面内嵌FRP筋混凝土粘结-滑移本构关系模型,并给出模型特征点的数学表达式,将拟合曲线与试验曲线进行对比分析。结果表明,该本构关系能够较为准确地模拟表面内嵌FRP筋混凝土的粘结滑移性能。

关键词: 表面内嵌, FRP筋, 粘结-滑移, 本构关系, 拉拔试验

Abstract: Under the pullout specimens strengthened with near-surface mounted (NSM) FRP bars, the bearing capacity process and the failure mode of the specimens are analyzed, and the influence of the parameters about the diameter of FRP bars, bonded length and the type of FRP on bond-slip behavior are studied. The results show that four types of failure modes including debonding failure at the interface between FRP bars and adhesive interface, debonding failure at the interface between concrete and adhesive epoxy, rupture of FRP bars and split of adhesive epoxy are obtained. The bond stress of the specimen with NSM BFRP increases with the bonded length, on the contrary, for the specimen with NSM GFRP bars. Due to the decrease of Poisson ratio of the FRP bars and the shear lag effect, the bond stress of the specimen decreases with increasing the diameter of FRP bars. At the same time, the model of the bond-slip constitutive relationship for the specimen strengthened with NSM-FRP bars is established and the mathematic representation of the characteristic points in the model is proposed based on the analysis and fitting of test results. The comparison between the fitting curve and experimental curve illustrates that the bond-slip constitutive relationship can accurately simulate the bond-slip behavior of concrete strengthened with NSM FRP bars.

Key words: near surface mounted (NSM), FRP bars, bond-slip, constitutive relationship, pullout test

中图分类号:

张海霞,何禄源. 表面内嵌FRP筋混凝土粘结-滑移本构关系试验研究[J]. 玻璃钢/复合材料, 2016, 0(3): 5-12.

ZHANG Hai-xia, HE Lu-yuan. EXPERIMENTAL STUDY ON BOND-SLIP BEHAVIOR BETWEENNSM FRP BARS AND CONCRETE[J]. Fiber Reinforced Plastics/Composites, 2016, 0(3): 5-12.

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表面内嵌FRP筋混凝土粘结-滑移本构关系试验研究

EXPERIMENTAL STUDY ON BOND-SLIP BEHAVIOR BETWEENNSM FRP BARS AND CONCRETE

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