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喷射FRP-混凝土界面黏结力学性能试验研究

160 Industrial Construction Vol .48,No .4,2018工业建筑 2018年第48卷第4期复材结构

喷射FRP -混凝土界面黏结力学性能试验研究*

杨 曌 李佳佳 刘 勇

(武汉科技大学城市建设学院,武汉 430065)

摘 要:为研究喷射FRP 与混凝土界面的黏结力学性能,对7个试件进行了双面剪切试验,分析其界面的破坏形态、极限承载力、剪力与剪切变形关系及应力、应变等力学性能指标,并对喷射FRP 材料的纤维体积率、黏结长度、厚度等界面性能影响因素展开了研究。试验结果表明:喷射FRP 厚度和黏结长度对界面黏结力学性能影响较大,而纤维体积率对界面黏结力学性能影响较小。增加喷射FRP 厚度可有效提高界面的极限承载力和初始黏结刚度,但厚度超过6mm 后,初始黏结刚度增大不明显;黏结长度越长,界面极限承载力越大、延性越好;界面的剥离始自喷射FRP 加载端;达到极限承载力时,传力区域长度为120~140mm 。

关键词:喷射纤维增强复合材料(喷射FRP );混凝土;黏结性能;影响因素

DOI :10.13204/j .gyjz201804030

EXPERIMENTAL RESEARCH ON BONDING MECHANICAL PROPERTIES BETWEEN SPRAYED FRP AND CONCRETE SUBSTRATES

YANG Zhao LI Jiajia LIU Yong (College of Urban Construction ,Wuhan University of Science and Technology ,Wuhan 430065,China )

Abstract :In order to clarify the interface bonding mechanical properties between sprayed FRP and concrete ,seven specimens were tested in double -lap shear experiments .The failure mode ,the ultimate shear capacity ,load -deformation relationship ,stress ,strain and other mechanical properties were analyzed .And the influence factors such as fiber volume fraction ,bond length and thickness of sprayed FRP material were investigated .The experimental results showed that the thickness and bond length of sprayed FRP had a great influence on the bonding mechanical properties of the interface ,while the fiber volume fraction had little effect on the bonding performance .Increasing the thickness of sprayed FRP could effectively improve the ultimate bearing capacity and initial bond stiffness of the interface .However ,the initial bond stiffness increased very few when the thickness exceed 6mm .The longer the bond length ,the greater the ultimate bearing capacity and the better ductility .The debonding of the interface started from the sprayed FRP loading end ;when the ultimate bearing capacity was reached ,the force transmission area was about 120mm to 140mm in length .Keywords :sprayed fiber reinforced polymer (sprayed FRP );concrete ;bonding performance ;influencing factors *国家自然科学基金项目(51678457);武汉市城建委科技计划项目(201552)。第一作者:杨曌,男,1977年出生,博士。通信作者:李佳佳,767551793@qq .com 。收稿日期:2017-10-15 近年来,纤维增强复合材料(FRP )凭借其强度

高、自重轻、耐久性好等优点广泛应用于混凝土结构

加固[1-2]。目前,FRP 加固的主要形式是将FRP 片

材或板材通过黏结剂粘贴在被加固构件表面。该加

固形式需要被加固构件提供平整且连续的加固面,

同时,需根据构件受力方向定向粘贴FRP 。当用于

梁柱节点等表面形态不规则、受力复杂的构件时,存

在施工复杂、黏结质量难以保证、约束效果差等

问题[3-4]。

为解决上述问题,喷射纤维增强复合材料(喷射FRP )加固技术逐步得到人们的重视和发展。喷射FRP 加固法,即指通过专用设备采用喷射施工方法,使被切短的纤维与专用黏结剂(聚酯树脂、环氧万方数据

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