A composite crack model for concrete based on meshless method
A composite crack model for concrete based on meshless method
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DOI：
10.12989/sem.2006.23.3.217
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发表时间：
2006-06
影响因子：
2.2
通讯作者：
Xinzheng Lu;Jian-Jing Jiang;L. Ye
中科院分区：
文献类型：
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作者：
Xinzheng Lu;Jian-Jing Jiang;L. Ye
本文提出了一种基于无网格法的混凝土断裂裂纹模型。根据裂缝宽度的不同，将混凝土中的裂缝分为宏观裂缝和微观裂缝，并采用不同的数值计算方法。微裂纹用弥散裂纹法表示，而宏观裂纹用由附加节点和边界组成的离散裂纹表示。采用无网格伽辽金法代替有限元法对混凝土进行建模，使无网格法中节点布置方便，便于实现离散裂纹法。旋转裂纹模型比固定裂纹模型具有更好的网格偏移性能，是该复合裂纹模型中较好的弥散裂纹模型。数值算例表明，该复合裂纹模型既能利用离散方法和离散方法的优点，又能克服离散方法的某些缺点。
A crack model for the fracture in concrete based on meshless method is proposed in this paper. The cracks in concrete are classified into micro-cracks or macro-cracks respectively according to their widths, and different numerical approaches are adopted for them. The micro-cracks are represented with smeared crack approach whilst the macro-cracks are represented with discrete cracks that are made up with additional nodes and boundaries. The widely used meshless method, Element-free Galerkin method, is adopted instead of finite element method to model the concrete, so that the discrete crack approach is easier to be implemented with the convenience of arranging node distribution in the meshless method. Rotating-Crack-Model is proved to be preferred over Fixed-Crack-Model for the smeared cracks of this composite crack model due to its better performance on mesh bias. Numerical examples show that this composite crack model can take advantage of the positive characteristics in the smeared and discrete approaches, and overcome some of their disadvantages.