混凝土破坏全过程分析的扩展内嵌裂缝模型
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TU311.4; O346

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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)


Extended embedded crack finite element method for modeling localized failures in concrete structures
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    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:

    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.

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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,2016,36(1):53-59.(WU Jianying, LI Fengbo, XU Shilang. Extended embedded crack finite element method for modeling localized failures in concrete structures[J]. Advances in Science and Technology of Water Resources,2016,36(1):53-59.(in Chinese))

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  • 在线发布日期: 2016-01-25
  • 出版日期: 2016-01-05