界面弹性模量对三维双丝拉拔混凝土的力学性能影响

发布时间：2018-03-10 16:27

本文选题：界面弹性模量　切入点：双丝　出处：《土木工程与管理学报》2017年02期 　论文类型：期刊论文

【摘要】：三维条件下双丝拉拔力学性能研究是纤维增强混凝土研究的重要基础。本文考虑双丝间的耦合作用和材料各相的细观非均匀性,建立了双丝拉拔混凝土三维模型,研究了界面弹性模量对双丝拉拔混凝土力学性能的影响以及界面的作用机理,获得了试件应力分布云图、声发射演化过程图、声发射位移荷载曲线,拟合了峰值荷载、相对韧度以及声发射能量与界面弹性模量的关系曲线。研究结果表明:低弹性模量的界面有利于缓和应力集中;双丝拉拔试件的强度和韧性均随界面弹性模量的增加而降低。
[Abstract]:The study of mechanical properties of double wire drawing is an important foundation of fiber reinforced concrete under three dimensional conditions. Considering the coupling between two wires and the mesoscopic inhomogeneity of different phases of materials, a three dimensional model of double wire drawing concrete is established in this paper. The influence of interfacial elastic modulus on mechanical properties of double-wire pull-out concrete and the mechanism of interface are studied. The stress distribution cloud diagram, acoustic emission evolution process diagram, acoustic emission displacement and load curve are obtained, and the peak load is fitted. The results show that the interface of low elastic modulus is beneficial to ease the stress concentration, and the strength and toughness of double wire drawing specimens decrease with the increase of interface elastic modulus.
【作者单位】：广州大学土木工程学院;
【基金】：国家自然科学基金(51678170,51278136) 广州市科技创新平台资助项目(15180005)
【分类号】：TU528

【相似文献】