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首页> 外文会议>SP-230; International Symposium on Fiber-Reinforced Polymer(FRP) Reinforcement for Concrete Structures; 20051106-09; Kansas City,MI(US) >Static and Fatigue Bond Characteristics of interfaces between CFRP Sheets and Frost Damage Experienced Concrete
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Static and Fatigue Bond Characteristics of interfaces between CFRP Sheets and Frost Damage Experienced Concrete

机译：CFRP板与冻害混凝土界面的静，疲劳粘结特性

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摘要

Both short and long-term performances of repaired or strengthened concrete structures using external FRP bonding are greatly affected by states of bonding substrates, which are covercrete and may have experienced various damages. One of them is frost damage in cold regions. This paper intends to investigate how the initial frost damages in concrete influence the static and fatigue bond performances of CFRP/concrete interfaces. Concrete specimens were exposed to freeze and thaw cycles before being bonded with CFRP sheets. The initial frost damage of concrete was controlled approximately at three different levels in terms of its relative dynamic modulus of elasticity, which was 100% (non frost damage), 85% and 70%, respectively. Test results showed that failure modes of CFRP/concrete bonded joints with initial frost damage in concrete were the delamination of covercrete. By contrast the joints without initial frost damage failed in a thin concrete layer as usual. Moreover, CFRP/concrete joints with and without initial frost damage showed different manners in their interface bonding strength and stiffness. If the initial frost damage existed in concrete substrate the effective bond length of CFRP/concrete joints was increased due to the decrease of the bonding stiffness and interfacial fracture energy. Fatigue testing results indicated that the linear slopes of S-N curves of CFRP/concrete bonded joints were not influenced by the initial frost damage. The initial frost damage did not shorten the fatigue life of CFRP/concrete joints if a same relative tensile stress level was kept in the FRP sheets, where the relative tensile stress level was defined as a ratio of the applied tensile force in FRP sheets forthe fatigue tests to the maximum static pullout one achieved in each test series.
机译：使用外部FRP粘结修复或加固的混凝土结构的短期和长期性能都受粘结基底状态的影响，粘结基底是覆盖混凝土的，可能会遭受各种损坏。其中之一是寒冷地区的霜冻破坏。本文旨在研究混凝土的初始霜冻破坏如何影响CFRP /混凝土界面的静力和疲劳粘结性能。在将混凝土标本与CFRP板粘合之前，要使其经受冻融循环。就其相对动态弹性模量而言，混凝土的初始霜冻破坏大约控制在三个不同的水平，分别为100％（无霜冻破坏），85％和70％。试验结果表明，CFRP /混凝土粘结节点的破坏模式具有混凝土的初始霜冻破坏是覆盖层混凝土的分层。相比之下，没有初始霜冻破坏的接缝照常在薄混凝土层中失效。此外，有或没有初始霜冻破坏的CFRP /混凝土接头在界面粘结强度和刚度方面表现出不同的方式。如果混凝土基质中存在最初的霜冻损害，则由于粘结刚度和界面断裂能的降低，CFRP /混凝土接头的有效粘结长度会增加。疲劳测试结果表明，CFRP /混凝土粘结节点的S-N曲线的线性斜率不受初始霜冻破坏的影响。如果在FRP板上保持相同的相对拉伸应力水平，则最初的霜冻破坏不会缩短CFRP /混凝土接头的疲劳寿命，其中相对拉伸应力水平定义为FRP板中疲劳施加的拉伸力之比测试每个测试系列达到的最大静态拉拔。

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