| 包海玲.细观力学模型在混凝土层裂实验中的应用[J].安徽建筑大学学报,2017,25(5):26-29 |
| 细观力学模型在混凝土层裂实验中的应用 |
| Application of Meso-mechanical Model in Spall Tests of Concrete |
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| DOI：10.11921/j.issn.2095-8382.20170506 |
| 中文关键词: 层裂实验 细观力学模型 数值模拟 反常现象 损伤积累 |
| 英文关键词: spall test meso-mechanical model numerical simulation abnormal phenomenon damage accumulation |
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| 中文摘要: |
| 利用细观力学的方法研究了造成混凝土层裂实验中出现反射应变峰值随着传播距离增加而增加的现象（即“反常”现象）原因。提出了三维三相（基体、骨料及二者之间的界面过度层-ITZ）细观力学模型的建模方法，并通过单元重构技术克服了ITZ层太薄而难以模拟的问题。利用三相细观力学模型模拟了层裂实验的破坏形貌并对比分析了三相、两相和宏观模型在模拟“反常”现象时的优缺点。研究表明：三相细观力学模型的模拟结果与实验结果具有更好的一致性，再结合损伤云图说明了造成“反常”现象的原因是损伤积累效应。 |
| 英文摘要: |
| The reason for the phenomenon that the peak value of the reflection strain increases with the propagation distance increases ( the phenomenon of “anomaly”) is studied with the method of micromechanics. The 3D three-phase (cement mortar, aggregates and interfacial transition zone-ITZ) meso-mechanical model is developed and the difficulty of simulating the very thin ITZ layer is overcome by employing element reconstruction technique. The damage morphology in spall test of concrete is simulated by using the three-phase meso-mechanical model and the advantages and disadvantages of three-phase, twophase and macroscopic models used in simulating “abnormal” phenomenon are analyzed. It indicates that the numerical results obtained from the three-phase meso-mechanical model are in good agreement with experimental results and combined with the damage cloud image, the cause of “abnormal” phenomenon is the effect of damage accumulation. |
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