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Assessment of the flexural behavior of reinforced concrete beams strengthened with concrete jackets

机译：钢筋混凝土护套加固钢筋混凝土梁的抗弯性能评估

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Analysis of continuous jacketed Reinforced Concrete (RC) beams requires accounting for the nonlinear behavior of the interface and the materials as well as redistribution of moments. This kind of analysis is complex and require an advanced level of knowledge and experience to perform. Engineers need simplified yet robust tools to practically predict the actual behavior of jacketed RC beams. In the current practice, slip is neglected in the analysis and monolithic behavior is assumed for the jacketed section, which result in higher estimates of stiffness and/or capacity. This paper provides a simplified method to analyze continuous jacketed RC beams taking into account the interfacial slip distribution and the actual nonlinear behavior of both concrete and steel. An iterative calculation algorithm is developed to determine the moment curvature curves of a jacketed beam at different sections. The developed method allows the evaluation of interfacial slip and shear stress distributions in ductile reinforced concrete beams. The developed method is utilized to conduct an extensive parametric study, which resulted into modification factors that can be used to calculate the capacity and deformations of a strengthened beam considering the interfacial slip.
机译：连续夹套钢筋混凝土（RC）梁的分析需要考虑界面和材料的非线性行为以及弯矩的重新分布。这种分析非常复杂，需要高级知识和经验才能执行。工程师需要简化而强大的工具来实际预测夹套RC梁的实际性能。在当前的实践中，在分析中忽略了滑移，并为夹套截面假定了整体性能，这导致了更高的刚度和/或承载力估计。考虑到混凝土和钢的界面滑移分布和实际的非线性行为，本文提供了一种简化的方法来分析连续夹套的RC梁。开发了一种迭代计算算法来确定夹套梁在不同截面的弯矩曲率曲线。所开发的方法可以评估延性钢筋混凝土梁的界面滑移和切应力分布。所开发的方法用于进行广泛的参数研究，从而得出修正系数，这些修正系数可用于计算考虑界面滑移的加固梁的承载力和变形。

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