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首页> 外文会议>2011 International Conference on Electric Technology and Civil Engineering >Interfacial shear stress and debonding failure in midspan of FRP strengthened RC beams
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Interfacial shear stress and debonding failure in midspan of FRP strengthened RC beams

机译：FRP加固RC梁中跨处的界面剪应力和剥离破坏

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Existing methods for predicting the shear stresses led to calculation results of great differences. In this paper, the shear stress was primarily evaluated by incorporating typical bond-slip (δ - τ) constitutive models and some test results obtained by the authors and other researchers. Then a new simplified and reliable finite element method (FEM) model named “beam segment model” is proposed and validated. Based on this model, the maximal value and distributions of interfacial shear stress in FRP strengthened beams under the influence of various parameters are calculated. The calculation results show a basic agreement with the existed experimental studies. It is indicated that the shear stress may reach the ultimate value τt even when the FRP tensile stress is at 30% of tensile strength. Based on the research results of both experimental studies and calculated analyses, it is consequently concluded that the interface shear stress should not be used to judge the debonding failures. It is also suggested that maximal relative slip between FRP and concrete may be better to be used as the debonding failure criterion.
机译：现有的预测剪应力的方法导致计算结果差异很大。在本文中，剪切应力主要通过结合典型的粘结滑移（δ-τ）本构模型以及作者和其他研究人员获得的一些测试结果进行评估。然后，提出并验证了一种新的简化可靠的有限元方法（FEM）模型，称为“梁段模型”。在该模型的基础上，计算了各种参数影响下FRP加固梁的界面剪应力的最大值和分布。计算结果与已有的实验研究基本吻合。结果表明，即使FRP拉伸应力为拉伸强度的30％时，剪应力也可能达到最终值τ t 。根据实验研究和计算分析的研究结果，得出的结论是，不应使用界面剪切应力来判断脱胶失败。还建议将FRP与混凝土之间的最大相对滑移率更好地用作脱粘破坏准则。

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