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首页> 外文期刊>International journal of multiscale computational engineering >A MULTISCALE/MULTIDOMAIN MODEL FOR THE FAILURE ANALYSIS OF MASONRY WALLS: A VALIDATION WITH A COMBINED FEM/DEM APPROACH
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A MULTISCALE/MULTIDOMAIN MODEL FOR THE FAILURE ANALYSIS OF MASONRY WALLS: A VALIDATION WITH A COMBINED FEM/DEM APPROACH

机译：砌体墙失效分析的多尺度/多域模型：组合有限元/ DEM方法的验证

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摘要

An accurate and fast failure simulation for masonry walls is still an active field of research, due to its fundamental role in predicting the overall response of masonry structures under seismic and other extreme natural and manoriginated events. Multiscale models have been successfully exploited for achieving this task, being characterized by high computational efficiency, especially in the presence of strong nonlinearities due to multiple microcrack initiation and propagation. In this paper, a novel multiscale/multidomain approach for nonlinear analysis of masonries is presented, based on a couple-stress homogenization for undamaged regions and an adaptive strategy for triggering the macro-to-micro switching operations. An extended validation of the proposed approach is presented, via suitable comparisons with a micromechanical model, here regarded as a benchmark model, that finely describes the microstructure, based on the combined finite/discrete element method (FEM/DEM). A critical discussion of the obtained numerical results has shown the efficacy of the proposed models as well as their limits of application.
机译：由于砌体墙在预测地震和其他极端自然和人为事件下砌体结构的整体响应中所起的基本作用，因此，对砌体墙进行准确，快速的破坏模拟仍然是一个活跃的研究领域。多尺度模型已经成功地用于实现该任务，其特点是计算效率高，尤其是在由于多个微裂纹的萌生和传播而存在强烈的非线性的情况下。在本文中，提出了一种新颖的多尺度/多域方法，用于砌体的非线性分析，该方法基于对未损坏区域的耦合应力均化和触发宏观到微观转换操作的自适应策略。通过与微机械模型（在这里被视为基准模型）进行适当的比较，提出了该方法的扩展验证，该模型基于有限元/离散元方法（FEM / DEM）来精细地描述了微结构。对获得的数值结果的严格讨论已经表明了所提出模型的有效性及其应用范围。

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