Fatigue pull-out failure of deformed bars in concrete under the effect of liquid water
Fatigue pull-out failure of deformed bars in concrete under the effect of liquid water
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DOI：
10.1016/j.cemconcomp.2018.05.007
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发表时间：
2018-08-01
影响因子：
10.5
通讯作者：
Nagai, Kohei
中科院分区：
文献类型：
--
作者：
Matsumoto, Koji;Yamaguchi, Hirofumi;Nagai, Kohei
为了研究在同时存在液态水的情况下承受疲劳载荷的变形杆的拔出行为，进行了疲劳拔出试验。实验参数是存在/不存在液态水，基质类型，加载模式，和存在的机械锚固。结果表明，在液态水和疲劳的复杂作用下，变形钢筋附近的基体转变为油泥，变形钢筋发生拔出破坏，但没有伴随宏观裂纹，导致疲劳寿命显著降低。拔出故障与污泥的形成发生在一个相对较低的负荷水平，并往往发生在水灰比高，并在反向加载。另一个发现是，机械锚固具有减少转化为污泥的效果，并具有防止拔出故障的有益效果。
To investigate the pull-out behavior of deformed bars subjected fatigue loading in the simultaneous presence of liquid water, fatigue pull-out tests were carried out. Experimental parameters were the presence/absence of liquid water, matrix type, loading pattern, and the presence of a mechanical anchorage. It was found that the matrix in the vicinity of the deformed bar was converted into sludge by the complex interaction of liquid water and fatigue, and pull-out failure of the deformed bar occurred without accompanying macro cracks, resulting in significantly reduced fatigue life. Pull-out failure associated with the formation of sludge occurred at a comparatively low load level, and tended to occur when the water-cement ratio was high and under reversal loading. A further finding is that mechanical anchorages have the effect of reducing the conversion to sludge and have the beneficial effect of preventing pull-out failure.