Identification and validation of a discrete element model for concrete
Identification and validation of a discrete element model for concrete
复制标题
DOI：
10.1061/(asce)0733-9399(2004)130:6(709
复制
发表时间：
2004-06-01
影响因子：
3.3
通讯作者：
Donzé, FV
中科院分区：
文献类型：
--
作者：
Hentz, S;Daudeville, L;Donzé, FV
本文提出用三维离散单元法（DEM）研究混凝土结构在动荷载作用下的动力响应。本文的目的是验证模型首先在准静态域，其次在动态压缩，在样本规模。一种特殊的生长技术被用来设置一个任意大小的球形颗粒相互作用的密集组装，代表混凝土。与只考虑接触相互作用的经典DEM的一个重要区别是使用了相互作用范围。首先，通过准静态单轴压缩和拉伸试验，正确识别了DEM模型的参数，以模拟弹性和非线性变形，包括损伤和破裂。显示了填料的影响。该模型产生的杨氏模量，泊松系数，抗压和抗拉强度的混凝土的强度和变形特性的定量匹配。通过动态试验验证了该方法的有效性。的.模拟显示了混凝土复杂的宏观行为，例如应变软化、由整个组件中广泛的微裂纹引起的断裂以及应变率依赖性。
The use of a three-dimensional discrete element method (DEM) is proposed to study concrete structures submitted to dynamic loading. The aim of this paper is to validate the model first in the quasistatic domain, and second in dynamic compression, at the sample scale. A particular growing technique is used to set a densely packed assembly of arbitrarily sized spherical particles interacting together, representing concrete. An important difference from classical DEMs where only contact interactions are considered, is the use of an interaction range. First, the correct identification of parameters of the DEM model to simulate elastic and nonlinear deformation including damage and rupture is made through quasistatic uniaxial compression and tension tests. The influence of the packing is shown. The model produces a quantitative match of strength and deformation characteristics of concrete in terms of Young's modulus, Poisson's coefficient, and compressive and tensile strengths. Then, its validity is extended through dynamic tests. The. simulations exhibit complex macroscopic behaviors of concrete, such as strain softening, fractures that arise from extensive microcracking throughout the assembly, and strain rate dependency.