用混合有限-离散元法模拟混凝土断裂

IF 2.9 4区 工程技术 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Concrete Pub Date : 2021-04-01 DOI:10.12989/CAC.2021.27.4.297
D. Elmo, A. Mitelman
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引用次数: 3

摘要

有限-离散元(FDEM)混合方法结合了有限元和离散元与断裂力学原理,因此它非常适合准脆性材料的真实模拟。尽管如此,在文献中,它对混凝土分析的应用是相当有限的。本文采用自主开发的FDEM代码ELFEN对不同尺寸的单轴压缩和间接拉伸(巴西试验)下的混凝土试件进行建模。结果表明,该方法能够捕捉到尺寸效应和应变速率影响等现象。此外,本文还建立了一种板坯受动力剪切冲孔作用的初步模型。由此产生的受冲击板的破裂模式与实际坍塌的观察结果相似。
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Modeling concrete fracturing using a hybrid finite-discrete element method
The hybrid Finite-Discrete Element (FDEM) approach combines aspects of both finite elements and discrete elements with fracture mechanics principles, and therefore it is well suited for realistic simulation of quasi-brittle materials. Notwithstanding, in the literature its application for the analysis of concrete is rather limited. In this paper, the proprietary FDEM code ELFEN is used to model concrete specimens under uniaxial compression and indirect tension (Brazilian tests) of different sizes. The results show that phenomena such as size effect and influence of strain-rate are captured using this modeling technique. In addition, a preliminary model of a slab subjected to dynamic shear punching due to progressive collapse is presented. The resulting fracturing pattern of the impacted slab is similar to observations from actual collapse.
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来源期刊
Computers and Concrete
Computers and Concrete 工程技术-材料科学:表征与测试
CiteScore
8.60
自引率
7.30%
发文量
0
审稿时长
13.5 months
期刊介绍: Computers and Concrete is An International Journal that focuses on the computer applications in be considered suitable for publication in the journal. The journal covers the topics related to computational mechanics of concrete and modeling of concrete structures including plasticity fracture mechanics creep thermo-mechanics dynamic effects reliability and safety concepts automated design procedures stochastic mechanics performance under extreme conditions.
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