混凝土破坏全过程分析的扩展内嵌裂缝模型

发布时间：2018-01-17 13:38

本文关键词：混凝土破坏全过程分析的扩展内嵌裂缝模型　出处：《水利水电科技进展》2016年01期 　论文类型：期刊论文

【摘要】：为解决传统内嵌裂缝模型仅能考虑定常位移跳跃而导致的应力闭锁问题,并保证裂缝张开位移在相邻单元间的连续性,基于强不连续问题位移场的多尺度统一表述,选取具有明确物理意义的裂缝节点(裂缝与单元边的交点)位移跳跃作为增强自由度,提出了适用于混凝土等准脆性材料和结构破坏全过程分析的扩展内嵌裂缝模型,并给出了其有限元实现方法。对楔入劈拉试验Ⅰ型和单边缺口梁混合型破坏等混凝土标准试验进行了数值分析,得到的裂缝路径和荷载-位移曲线均与试验结果或文献结果吻合良好,验证了模型理论的有效性,同时分析结果也表明该模型具有较高的粗网格精度和良好的数值健壮性。
[Abstract]:In order to solve the problem of stress locking caused by steady displacement jump in the traditional embedded crack model, the continuity of crack opening displacement between adjacent elements can be ensured. Based on the multi-scale unified representation of the displacement field of the strongly discontinuous problem, the displacement jump of the crack node (the intersection of the crack and the element edge) is selected as the enhanced degree of freedom. In this paper, a model of propagation inlay crack is proposed, which is suitable for the analysis of the whole process of failure of concrete and other quasi brittle materials. The finite element method is given and the concrete standard tests such as wedge splitting tensile test type I and mixed failure of one-sided notched beam are analyzed numerically. The obtained crack paths and load-displacement curves are in good agreement with the experimental results or the literature results, which verifies the validity of the model theory. The results also show that the model has high coarse mesh accuracy and good numerical robustness.
【作者单位】：浙江大学建筑工程学院;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金优秀青年科学基金(51222811) 浙江省重点科技创新团队项目(2010R50034) 亚热带建筑科学国家重点实验室自主研究课题(2015ZB24)
【分类号】：TU528
【正文快照】： 混凝土在高层建筑、高速铁路、高速公路、水工结构、桥梁涵隧等重大土木工程结构中应用十分广泛。作为典型的准脆性材料,混凝土裂缝的非线性演化和扩展是导致结构完整性降低甚至发生破坏的罪魁祸首,因此,保证混凝土结构安全服役必须全面地掌握裂缝,并客观准确地反映裂缝非线性

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