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Experimental study on seismic behaviors of concrete columns confined by corroded stirrups and lateral strength prediction

机译：锈蚀箍筋约束混凝土柱抗震性能试验及侧向强度预测

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摘要

To understand the seismic behaviors of concrete columns confined by corroded stirrups, low-reversed cyclic loading tests were carried out on eight corroded reinforced concrete columns to study their mechanical characteristics and failure mechanisms. The influence on seismic performance indicators such as bearing capacity, hysteresis characteristics, ductility, strength degradation, stiffness degradation, and energy dissipation was analyzed comparatively based on parameters such as stirrup diameter and stirrup-spacing changes. The experimental results showed that the restraint of concrete provided by corroded stirrups is reduced, which leads to a decline in seismic performance, and with increasing stirrup corrosion, the failure limit displacement of columns decreases. The pinch phenomenon of the hysteresis curve gradually increases, the attenuation degree of strength and stiffness increases, and the ductility, and energy-dissipation capacity is reduced, while the accumulated energy increases under the same control displacement. A method for predicting the lateral strength of reinforced concrete columns confined by corroded stirrups is presented based on the axial-shear-flexure interaction approach for conventional concrete columns, with modifications to consider the effect of stirrup corrosion. There was good agreement is achieved between the test results and theoretical values. (C) 2017 Published by Elsevier Ltd.
机译：为了了解受锈蚀箍筋约束的混凝土柱的抗震性能，对八根锈蚀钢筋混凝土柱进行了低反向循环荷载试验，以研究其力学特性和破坏机理。根据箍筋直径和箍筋间距变化等参数，比较分析了对承载力，滞后特性，延性，强度退化，刚度退化和能量耗散等地震性能指标的影响。实验结果表明，受腐蚀的箍筋对混凝土的约束作用减小，导致抗震性能下降；随着箍筋腐蚀的增加，柱的破坏极限位移减小。在相同的控制位移下，磁滞曲线的收缩现象逐渐增加，强度和刚度的衰减程度增加，延展性和能量耗散能力降低，而累积的能量则增加。基于轴向-剪切-挠曲相互作用方法，提出了一种基于锈蚀箍筋约束的钢筋混凝土柱侧向强度的预测方法，并进行了修改以考虑箍筋腐蚀的影响。测试结果与理论值之间取得了很好的一致性。 （C）2017由Elsevier Ltd.发布

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