NUMERICAL SIMULATION OF FRACTURE PROCESS OF CONCRETE MODEL BY RIGID BODY SPRING METHOD
NUMERICAL SIMULATION OF FRACTURE PROCESS OF CONCRETE MODEL BY RIGID BODY SPRING METHOD
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刚体弹簧法混凝土模型断裂过程数值模拟
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Y. Kakuta
中科院分区：
文献类型：
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作者：
K. Nagai;Yasuhiko Sato;T. Ueda;Y. Kakuta
在细观层次上，混凝土由砂浆和骨料组成。刚体弹簧法是模拟断裂等离散行为的一种有效的分析方法。本文提出了细观层面的砂浆及砂浆-骨料界面本构模型，模拟了砂浆和混凝土的断裂过程。为了描述任意裂纹路径，引入了Voronoi图.混凝土是细观层次上由骨料和砂浆组成的复合材料。在该水平上评估断裂过程对于在宏观水平上量化混凝土性能是有用的，其中混凝土被假设为均质的。它被认为，此外，环境作用对混凝土的力学特性的影响，可以更精确地澄清使用细观层次上的分析方法。在细观层次上对断裂机理进行了大量的实验研究。然而，几乎没有数值分析的断裂过程中的细观水平进行。本文采用刚体弹簧法对砂浆的压拉试验和简化砂浆混凝土模型的受压试验进行了数值模拟。该分析方法可用于混凝土断裂过程的数值模拟。Saito和Hikoji（1）已经建立了钢筋混凝土结构的宏观本构模型，但还没有细观本构模型。在本研究中，砂浆，骨料和界面的细观层次上的本构模型。研究了骨料、砂浆和界面各组分的断裂过程和行为，并将宏观应力-应变曲线与试验结果进行了比较。
In meso-scopic level, concrete consists of mortar and aggregate. Rigid Body Spring Method is a useful analytical method to simulate discrete behavior like fracture. This study presents constitutive models for mortar and mortar-aggregate interface in meso level and simulates fracture process of mortar and simplified concrete model. To formulate arbitrary crack path, the Voronoi diagram is introduced. The Concrete is a composite material consisting of aggregate and mortar in meso-scopic level. Evaluation of the fracture process in this level is useful to quantify concrete properties in macro level in which the concrete is assumed homogeneous. It is considered, furthermore, that influences of environmental action on the mechanical characteristics of concrete can be clarified more precisely using the analytical approach in meso-scopic level. Many experimental studies on the fracture mechanism in meso level have been conducted. However almost no numerical analysis of the fracture process in meso level has been carried out. In this study, numerical simulation of compression and tension tests of mortar and compression tests of simplified aggregate-mortar concrete model are conducted by Rigid Body Spring Method (RBSM). This analytical method is useful to simulate the fracture process of concrete. Macro-scopic constitutive models of RC structures for RBSM have been developed by Saito and Hikosaka(1), however no constitutive model in meso level. In this study, constitutive models for mortar, aggregate and interface are presented in meso level. The fracture process and behavior of each component, aggregate, mortar and interface, are examined and the macroscopic stress-strain curves are compared with experimental results.