Debonding along the FRP–concrete interface under combined pulling/peeling effects
Debonding along the FRP–concrete interface under combined pulling/peeling effects
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DOI：
10.1016/j.engfracmech.2006.01.022
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发表时间：
2007
影响因子：
5.4
通讯作者：
Jinlong Pan;C. Leung
中科院分区：
文献类型：
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作者：
Jinlong Pan;C. Leung
纤维增强塑料（FRP）板或板与混凝土梁的粘结已被发现是一种有效的抗弯加固技术。在钢筋混凝土梁中，跨内的主要弯/剪裂缝可能引起脱粘。在此条件下，主裂缝两侧存在相对竖向位移。FRP同时受到拉力和剥离力的作用，导致沿FRP/混凝土界面产生剪切滑动和开口位移的组合。在本研究中，采用一种新的实验装置，研究了复合拉伸/剥离对FRP脱粘的影响。提出了一种新的理论模型，用于这种情况下的脱粘分析。在该模型中，界面行为由四个参数描述，其中一个参数是界面剪切强度，它受最大界面正应力的影响。该模型利用两个试件的一组参数，能够描述不同厚度、不同剥离程度的试件的FRP脱粘行为。从而证明了所提出的分析方法对实际材料体系中拉扯/剥离联合作用下界面脱粘的适用性。
The bonding of fiber reinforced plastics (FRP) plates or sheets to the concrete beams has been found to be an effective technique for flexural strengthening. In a reinforced concrete beam, debonding may be induced by a major flexural/shear crack in the span. Under such condition, there is relative vertical displacement on the two sides of the major crack. The FRP is then under both pulling and peeling forces, resulting in a combination of shear sliding and opening displacement along the FRP/concrete interface. In this investigation, using a novel experimental set-up, the effect of combined pulling/peeling on FRP debonding is studied. A new theoretical model for debonding analysis under such a situation is developed. In the model, the interfacial behavior is described by four parameters, with one of them, the interfacial shear strength, affected by the maximum interfacial normal stress. With a set of parameters obtained from two of the specimens, the model is able to describe the debonding behavior of FRP for various specimens with different thickness and under various degrees of peeling effect. The applicability of the proposed analytical approach to the analysis of interfacial debonding under combined pulling/peeling effects in real material systems is hence demonstrated.