LOCALIZED FAILURE OF CONCRETE IN COMPRESSION IDENTIFIED BY AE METHOD
LOCALIZED FAILURE OF CONCRETE IN COMPRESSION IDENTIFIED BY AE METHOD
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DOI：
10.1016/j.conbuildmat.2003.10.008
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发表时间：
2003-12
影响因子：
7.4
通讯作者：
Ken Watanabe;J. Niwa;M. Iwanami;H. Yokota
中科院分区：
文献类型：
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作者：
Ken Watanabe;J. Niwa;M. Iwanami;H. Yokota
当混凝土遭受单轴压缩时，破坏过程通常从局部区域开始。破坏的局部化控制着混凝土的结构行为。特别是荷载-变形曲线峰后区域受影响较大。因此，有必要对压缩局部破坏区域的范围进行研究。在本研究中，声发射（AE）方法用于区分混凝土的损伤程度，因为该方法可以量化混凝土结构的损伤。利用声发射活动量化压缩破坏区长度，并将其与裂纹目测值、亚克力杆法局部能耗分布和简化关系式计算的压缩破坏区长度进行比较。然后，将声发射法应用于某钢筋混凝土深梁的剪切破坏，并确定了其二维破坏区域。
When concrete is subjected to uniaxial compression, the failure process is normally initialed from a localized zone. The localization of failure governs structural behaviors of concrete. In particular, the post-peak region of load–deformation curve is greatly affected. Therefore, it is necessary to investigate the extent of the localized failure zone in compression. In this study, acoustic emission (AE) method is applied to distinguish the damage level of concrete, because the method can be applied to quantify the damage in concrete structures. The length of compressive failure zone is quantified by AE activity, which is compared with visual observation of cracks, the distribution of the local energy consumption by the acrylic rod method, and the calculated length by the simplified relation. Then, AE method is applied to a reinforced concrete deep beam which fails under shear compression, and of which two dimensional failure zone is identified.