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Analysis of localized fracture in 3D reinforced concrete structures using volume averaging technique

机译:使用体积平均技术分析3D钢筋混凝土结构中的局部断裂

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In this paper, the propagation of localized damage in reinforced concrete structures is investigated in three dimensional domain. A mesoscale approach is employed whereby the material is perceived as a composite medium comprising two constituents, i.e. concrete matrix and steel reinforcement. The response at the macroscale is obtained via a homogenization procedure that incorporates the volume averaging. After the onset of cracking in concrete, a traction-separation law is introduced for the fractured zone, in which the Timoshenko beam theory is used to assess the stiffness characteristics in the presence of reinforcement. A general 3D scheme for tracing the crack geometry is incorporated, which employs a smoothening algorithm. The mathematical formulation is implemented in Abaqus user subroutine UMAT to verify the performance of the proposed methodology against the available experimental data. A number of numerical examples are given that examine the crack pattern formation and the associated fracture mechanism in concrete beams at different intensity of reinforcement.
机译:在本文中,研究了钢筋混凝土结构中局部损伤的传播,并在三维范围内进行了研究。采用中尺度方法,由此将材料视为包括两种成分即混凝土基质和钢筋的复合介质。宏的响应是通过均化程序获得的,该程序包含了体积平均。混凝土开裂开始后,针对断裂区域引入了牵引分离法则,其中使用Timoshenko梁理论来评估存在钢筋时的刚度特性。引入了用于跟踪裂纹几何形状的通用3D方案,该方案采用了平滑算法。在Abaqus用户子程序UMAT中实现了数学公式,以根据可用的实验数据验证所提出方法的性能。给出了许多数值示例,研究了在不同强度的钢筋混凝土梁中的裂纹模式的形成以及相关的断裂机理。

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