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基于弹性理论建立了碳纤维加固钢筋混凝土梁的界面剪应力模型,研究了四点弯曲情况下的界面黏结胶层剪应力的分布规律,明确了改变各相关参数对界面黏结剪应力的影响程度。计算结果表明,界面黏结剪应力最大值位于碳纤维的黏结端部,并且剪应力随着距离的增加呈现出非线性递减趋势,当距离超过一定长度后,碳纤维与混凝土界面间的黏结剪应力值降为很小,其值基本接近于零,因此在实际工程中应注意端部的锚固。同时发现增加梁高度、胶层厚度可以降低碳纤维与混凝土界面黏结剪应力值;增加碳纤维粘贴层数和碳纤维端部距离支点的距离可以增大碳纤维与混凝土界面黏结剪应力值,此规律应在实际加固工程中加以利用。
Based on the elastic theory, the interfacial shear stress model of RC beams strengthened with carbon fiber was established. The distribution of interfacial shear stress distribution under four-point bending condition was studied. The influence of various parameters on interfacial shear stress was clarified. The calculated results show that the maximum interfacial shear stress is located at the bonded end of the carbon fiber and the shear stress decreases nonlinearly with the increase of the distance. When the distance exceeds a certain length, the shear stress of the interfacial bond between the carbon fiber and the concrete decreases Is small, its value is almost close to zero, so in the actual project should pay attention to the end of the anchor. At the same time, it is found that increasing the beam height and the thickness of the adhesive layer can reduce the bond shear stress at the interface between the carbon fiber and the concrete. Increasing the number of carbon fiber bonding layers and the distance from the fulcrum of the carbon fiber end can increase the bond shear stress at the interface between the carbon fiber and the concrete. Strengthen the project to be used.