纵向受拉钢筋锈蚀钢筋混凝土梁的抗剪性能

发布时间：2017-12-31 15:18

本文关键词：纵向受拉钢筋锈蚀钢筋混凝土梁的抗剪性能　出处：《上海交通大学学报》2016年11期 　论文类型：期刊论文

【摘要】：对纵向受拉钢筋锈蚀钢筋混凝土梁的抗剪性能展开实验研究.实验梁根数为12根,实验变量为纵向受拉钢筋锈蚀程度以及剪跨比(a/d),采用电化学加速法模拟纵向受拉钢筋锈蚀,并通过3点加载实验调查锈蚀钢筋混凝土梁的抗剪性能.实验结果表明,纵向受拉钢筋锈蚀导致的粘结退化会引起锈蚀梁的承载机制发生变化,最终影响到梁的抗剪承载力.具体表现在:锈蚀引起主斜裂缝向加载点移动,"拱机制"增强导致混凝土承担剪力增加,但和主斜裂缝相交的屈服箍筋数量减小导致"桁架机制"承担的剪力下降.上述承载机制迁移现象不仅与纵向受拉钢筋锈蚀程度有关,同时也受剪跨比的影响.
[Abstract]:The experimental results show that the number of experimental beams is 12, and the experimental variables are corrosion degree of longitudinal tensile bars and shear span ratio (a / d). The corrosion behavior of corroded steel bars subjected to longitudinal tension was simulated by electrochemical acceleration method and the shear behavior of corroded reinforced concrete beams was investigated by three point loading experiments. The bond degradation caused by the corrosion of longitudinal tensile steel bar will cause the change of the bearing mechanism of the corroded beam and ultimately affect the shear bearing capacity of the beam. The concrete performance is that the corrosion causes the main oblique crack to move to the loading point. The reinforcement of "arch mechanism" leads to the increase of shear force of concrete. However, the decrease of the number of yield stirrups intersecting with the main oblique cracks leads to the decrease of the shear force assumed by the truss mechanism, which is not only related to the corrosion degree of the longitudinal tensile steel bars, but also affected by the shear span ratio.
【作者单位】：厦门大学建筑与土木工程学院;
【基金】：福建省自然科学基金项目(2013J01207)
【分类号】：TU375.1
【正文快照】： 钢筋混凝土(RC)结构处于氯离子侵蚀和混凝土碳化的单独或耦合作用时,钢筋锈蚀是导致其结构性能劣化甚至发生破坏的严重劣化现象之一[1].对于钢筋锈蚀RC梁,纵向受拉钢筋锈蚀对其抗弯性能的影响已经得到广泛的研究并取得一定的成果[2-4],然而关于抗剪性能影响的研究相对较少.RC

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