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Analysis of the shear failure process of masonry by means of a meso-scopic mechanical modeling approach

机译:用细观力学建模方法分析砌体的剪切破坏过程

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摘要

The masonry is a complex heterogeneous material and its shear deformation and fracture is associated with very complicated progressive failures in masonry structure, and is investigated in this paper using a mesoscopic mechanical modelling, Considering the heterogeneity of masonry material, based on the damage mechanics and elastic-brittle theory, the newly developed Material Failure Process Analysis (MFPA) system was brought out to simulate the cracking process of masonry, which was considered as a three-phase composite of the block phase, the mortar phase and the block-mortar interfaces. The crack propagation processes simulated with this model shows good agreement with those of experimental observations by other researchers. This finding indicates that the shear fracture of masonry observed at the macroscopic level is predominantly caused by tensile damage at the mesoscopic level. Some brittle materials are so weak in tension relative to shear that tensile rather than shear fractures are generated in pure shear loading.
机译:砌体是一种复杂的异质材料,其剪切变形和断裂与砌体结构中非常复杂的渐进破坏相关,因此本文采用介观力学建模方法,基于损伤力学和弹性,考虑了砌体材料的异质性,对其进行了研究。脆性理论,提出了新开发的材料破坏过程分析(MFPA)系统,以模拟砌体的开裂过程,该砌体被认为是块状相,砂浆相和块状砂浆界面的三相复合体。用该模型模拟的裂纹扩展过程与其他研究人员的实验观察结果吻合良好。这一发现表明,在宏观水平上观察到的砌体的剪切断裂主要是由在中等水平上的拉伸损伤引起的。某些脆性材料相对于剪切的拉伸强度很弱,以至于在纯剪切载荷下会产生拉伸而不是剪切断裂。

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