Numerical study of mixed-mode fracture in concrete
Numerical study of mixed-mode fracture in concrete
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DOI：
10.1023/a:1022886127806
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发表时间：
2002-11-01
影响因子：
2.5
通讯作者：
Reinhardt, HW
中科院分区：
文献类型：
--
作者：
Ozbolt, J;Reinhardt, HW
本文采用基于混凝土微平面模型的有限元程序，分析了典型的混合模几何结构：单侧缺口梁、双侧缺口试件和榫盘试件。进行了局部涂抹断裂有限元分析。作为正则化过程，采用裂纹带法。该研究的主要目的是研究涂抹断裂有限元程序是否能够在没有优化材料模型参数的情况下预测混凝土的混合模式断裂。实验结果与数值计算结果的比较表明，所采用的程序能较好地预测结构的响应和裂缝形态。结果表明：裂纹萌生时以混合模式断裂为主，但随着裂纹长度的增加，ⅰ型断裂逐渐成为主导断裂模式，试样最终以ⅰ型断裂失效。
In the present paper, a finite element code based on the microplane model for concrete is used for the analysis of typical mixed-mode geometries: a Single-Edge-Notched beam, a Double-Edge-Notched specimen and a Dowel-Disk specimen. A local smeared fracture finite element analysis is carried out. As a regularization procedure, the crack band method is used. The principal objective of the study was to investigate whether the smeared fracture finite element code is able to predict mixed-mode fracture of concrete with no optimisation of the material model parameters. Comparison between experimental and numerical results shows that the used code predicts structural response and crack patterns realistically for all cases investigated. Moreover, it is shown that for most of the studied geometries a mixed-mode fracture mechanism dominates at crack initiation, however, with increase of the crack length mode-I fracture becomes dominant and the specimens finally failed in mode-I fracture.