单轴压缩试验下混凝土性能的离散元建模

IF 1.1 Q3 ENGINEERING, CIVIL
S. Marooden, H. Rahimi
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引用次数: 0

摘要

本文采用离散元模型(DEM)对单轴压缩试验中的混凝土进行了三维(3D)模拟。本文的目的是验证所建立的数值模型,并研究混凝土的开裂起裂和破坏过程,以便更好地了解混凝土的断裂行为。采用基于筛分试验分析的算法对颗粒进行分布。为了验证数值模型与实验结果的一致性,对数值模型进行了参数设置。结果表明,含44339个球的三维模型在应力-应变响应和宏观裂纹发展方面与实验室试验基本一致。一旦球体之间的结合被打破,就会导致微观裂纹的形成,这在实验室测试中是不可见的。DEM可以帮助识别混凝土结构单元的哪一部分更容易发生微观和宏观裂缝的演变。从测试期间记录的观察结果来看,很明显DEM能够定量和定性地捕获具体行为。还可以测量存储在线性接触键和平行键中的应变能。在混凝土屈服点处,应变能以动能、摩擦滑移能、阻尼器能和局部阻尼的形式释放。这可以在以后的工作中进一步推广到裂缝能的计算中。因此,可以得出结论,DEM可以用于研究混凝土结构开裂和断裂的随机性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Discrete Element Modelling of Concrete Behaviour under Uniaxial Compressive Test
This paper presents a three-dimensional (3D) simulation of the concrete behavior in a uniaxial compressive test using Discrete Element Modelling (DEM). The aim of this paper is to validate the numerical model developed and to study the cracking initiation and failure process in order to better understand the fracture behavior of concrete. The particles were distributed using an algorithm that is based on sieve test analysis. The parameters were set up in order to validate the numerical model with the experimental result. It was observed that the three-dimensional model with 44339 spheres is in line with the laboratory test in term of stress-strain response and macroscopic cracks development. Once the bond between the spheres was broken, it lead to the formation of microscopic cracks which were not visible in laboratory test. DEM can help to identify which part of a concrete structural element is more prone to the evolution of microscopic and macroscopic cracks. From the observation recorded during the testing, it is clear that DEM is capable of capturing concrete behavior both quantitatively and qualitatively. It is also possible to measure the strain energy stored in the linear contact bond and parallel bond. At the yielding point in the concrete the strain energy is released in the form of kinetic energy, frictional slip energy, energy of dashpot and local damping. This can be extended further to calculate fracture energy in the future works. Hence, it can be concluded DEM can be used to study the random nature of the cracking and fracturing of concrete structures.
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CiteScore
2.60
自引率
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发文量
8
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