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Modeling dowel action of reinforcement bars for finite element analysis of concrete structures

机译：建模混凝土结构有限元分析的钢筋销钉作用

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A numerical model for the dowel action of reinforcement bars crossing cracks in concrete is developed for finite element analysis of concrete structures. The beam on elastic foundation theory is used to derive the dowel force dis- placement relationship, which is expressed in a smeared form in terms of dowel stress and strain in order to be com- patible with the smeared crack and smeared reinforcement models commonly used in finite element analysis. This dowel action model is incorporated in a finite element program that employs secant stiffness formulation and a displacement controlled iteration scheme for nonlinear analysis. Using the finite element program, the nonlinear behaviors of several reinforced concrete beams tested by others are analyzed well into the post-peak range. The beams are analyzed first with the dowel action neglected and then again with the dowel action incorporated. It is found that in certain cases, the dowel action can have significant effects on the shear strength and ductility of reinforced concrete beams and that the analytical results generally agree better with the experimental values when the dowel action is taken into account.
机译：建立了钢筋穿过混凝土裂缝的销钉作用的数值模型，用于混凝土结构的有限元分析。弹性地基理论上的梁用于导出销钉力-位移关系，该销钉以涂抹销的形式根据销钉应力和应变来表示，以便与通常使用的涂抹拖缝和涂抹涂抹钢筋模型兼容有限元分析。此销钉作用模型并入有限元程序中，该程序采用割线刚度公式和位移控制的迭代方案进行非线性分析。使用有限元程序，可以很好地分析在峰值后范围内其他人测试的几种钢筋混凝土梁的非线性行为。首先，在忽略销钉作用的情况下分析梁，然后在合并销钉作用的情况下再次分析梁。结果发现，在某些情况下，销钉作用可对钢筋混凝土梁的抗剪强度和延性产生显着影响，并且当考虑到销钉作用时，分析结果通常与实验值更好地吻合。

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