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Simulation of damage in concrete structures using multiscale models

机译:使用多尺度模型模拟混凝土结构的损伤

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In this paper an adaptive heterogeneous multiscale model that couples two substructures with different length scales within one numerical model is introduced for the simulation of damage in concrete. In the presented approach the initiation, propagation and coalescence of microcracks is simulated using a mesoscale model, which explicitly represents the heterogeneous material structure of concrete. The mesoscale model is restricted to the damaged parts of the structure, whereas the undamaged regions are simulated on the macroscale. As a result an adaptive enlargement of the mesoscale model during the simulation is necessary. In this paper the generation of the mesoscopic geometry of concrete, the finite element model and the used nonlocal isotropic damage model are briefly described. The main focus is on the adaptive multiscale approach. Indicators for the model adaptation are introduced and the adaptive enlargement of the mesoscale substructure is presented.
机译:本文提出了一种自适应异质多尺度模型,该模型在一个数值模型中耦合了具有不同长度尺度的两个子结构,以模拟混凝土的损伤。在提出的方法中,使用中尺度模型模拟了微裂纹的萌生,传播和合并,该模型明确表示了混凝土的异质材料结构。中尺度模型仅限于结构的受损部分,而未损坏区域则在宏观尺度上进行模拟。结果,在仿真过程中必须适度扩大中尺度模型。本文简要介绍了混凝土介观几何的生成,有限元模型和所用的非局部各向同性损伤模型。主要重点是自适应多尺度方法。介绍了模型适应性的指标,并提出了中尺度子结构的适应性扩大。

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