水利水电科技进展Issue(1)：53-59,7.DOI:10.3880/j.issn.1006-7647.2016.01.010
混凝土破坏全过程分析的扩展内嵌裂缝模型
Extended embedded crack finite element method for modeling localized failures in concrete structures
摘要
Abstract
A novel extended embedded crack finite element method ( XE-FEM) is proposed for modeling localized failures in concrete-like quasi-brittle materials and structures. Based on the unified multi-scale kinematics recently developed by the authors, the displacement jumps at the cracking nodes, where cracks intersect with the element edges, are selected as the elemental enrichment parameters. In addition to constant displacement jumps induced by relative translations of rigid bodies, linear deformation modes caused by rigid body rotation and self-stretching are consistently accounted for in the kinematics, so that the spurious stress locking can be removed. The enrichment parameters, which are shared by neighboring elements, can be regarded as global variables in the numerical implementation. Thus, the continuity of the displacement jumps can be guaranteed along the crack propagation path. Two benchmark tests of concrete structures, i. e. , the wedge-splitting test with mode-I failure and the single-edge notched beam with mixed-mode failure, were numerically simulated to validate the suggested method. The calculated response of load versus displacement and crack paths were compared to available experimental data and numerical results obtained from other methods. It is shown that the suggested method is stable and robust, with a high resolution in regard to coarse meshes.关键词
混凝土/损伤与破坏/内嵌裂缝模型/应力闭锁/有限元方法Key words
concrete/damage and failure/embedded crack model/stress locking/finite element method分类
建筑与水利引用本文复制引用
吴建营,李锋波,徐世烺..混凝土破坏全过程分析的扩展内嵌裂缝模型[J].水利水电科技进展,2016,(1):53-59,7.基金项目
国家自然科学基金优秀青年科学基金(51222811) （51222811）
浙江省重点科技创新团队项目(2010R50034) （2010R50034）
亚热带建筑科学国家重点实验室自主研究课题(2015ZB24) （2015ZB24）
