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Analysis of interfacial shear stresses in beams strengthened with bonded prestressed laminates

机译：粘结预应力层合板加固梁的界面剪应力分析

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In this paper, the problem of interfacial shear stresses in beams strengthened with bonded prestressed composite laminates is analyzed using linear elastic theory. The analysis provided a closed-form formula for calculating the critical maximum shear stress at the end of the laminate for a beam with arbitrary cross-section and material. A demonstration study on strengthening an existing steel bridge using this technique has also been conducted using FE-analysis. The results from both analyses agreed very well. Also, a parametric study is performed in order to identify the effects of various geometrical and material properties on the magnitude of interfacial shear stresses. The results show that there exists a high concentration of shear stresses at the ends of the laminate, which might result in a premature failure of the strengthening scheme at these locations. Material properties such as laminate and adhesive stiffness and the dimensions of the laminate were all found to have a marked effect on the magnitude of maximum shear stress in the composite member.
机译：本文采用线性弹性理论分析了粘结预应力复合层合板加固梁的界面剪应力问题。该分析提供了一个封闭形式的公式，用于计算具有任意横截面和材料的梁在层压板末端的临界最大剪切应力。利用有限元分析还进行了使用这种技术加固现有钢桥的示范研究。两种分析的结果都非常吻合。此外，进行了参数研究，以确定各种几何和材料特性对界面剪应力大小的影响。结果表明，在层压板的端部存在较高的切应力集中，这可能会导致这些位置处的加固方案过早失效。发现诸如层压板和粘合刚度的材料特性以及层压板的尺寸均对复合构件中的最大剪切应力的大小具有显着影响。

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