To investigate the influence of corroded steel bars on seismic performance of reinforced concrete (RC) columns, eight full-scale RC columns were designed and fabricated, which were composed of one uncorroded RC column, three RC columns with longitudinal reinforcement corrosion and four stirrup-corroded RC columns. The electrochemical test was conducted to accelerate the corrosion of steel bars in RC columns, and the low-cyclic repeated loading tests on RC columns with corrosion-damaged steel bars were carried out. The seismic behavior indicators, including the hysteretic curves, skeleton curves, displacement ductility coefficient, stiffness degradation curves and energy dissipation capacity of corroded RC columns and uncorroded columns, were compared and discussed. The experimental results show that with the increase in steel bars corrosion degree, the pinch phenomenon of the hysteretic curve gradually increases, and the energy dissipation capacity, stiffness and plastic deformation capacity of specimen reduce significantly. The ductility and energy dissipation coefficient decreased by 20% and 36%, respectively, when the stirrups corrosion ratio of specimen reaches 15.2%, and a shear failure surface was formed in the plastic hinge zone at the foot of the columns, which leads to the change of failure mode from ductile bending failure to shear failure with poor ductility under the ultimate load for corroded columns. The influence of stirrup corrosion on the failure mode of specimens is remarkable, but the effect of longitudinal reinforcement corrosion is negligible for specimens with the corrosion ratio within 14.7%. The adverse effects caused by over 15.2% stirrup corrosion should be considered in seismic design of structures in seismic zone.

中文翻译：

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低周反复荷载下锈蚀钢筋混凝土柱节点的抗震性能

为了研究锈蚀钢筋对钢筋混凝土柱抗震性能的影响，设计并制造了八根全尺寸RC柱，其中包括一根未腐蚀的RC柱，三根纵向钢筋腐蚀的RC柱和四根箍筋。钢筋混凝土柱腐蚀。进行电化学测试以加速钢筋混凝土钢筋在钢筋混凝土柱中的腐蚀，并在钢筋混凝土锈蚀混凝土柱上进行了低周反复载荷试验。比较并讨论了锈蚀RC柱和非锈蚀柱的滞回曲线，骨架曲线，位移延性系数，刚度退化曲线和能量耗散能力等指标。实验结果表明，随着钢筋腐蚀程度的增加，滞回曲线的收缩现象逐渐增加，样品的耗能能力，刚度和塑性变形能力明显降低。当试样的箍筋腐蚀率达到15.2％时，延性和能量耗散系数分别降低20％和36％，并且在柱脚的塑料铰链区中形成了剪切破坏表面，从而导致腐蚀模式下，在极限荷载下，从延性弯曲破坏变为延性差的剪切破坏的破坏模式。箍筋腐蚀对试样破坏模式的影响是显着的，但对于腐蚀率在14.7％以内的试样，纵向钢筋腐蚀的影响可以忽略。造成的不良影响超过15岁。