Time Effect of the Low Cycle Fatigue Property Degradation of Reinforcement After Electrochemical Repair and Its Influence
MAO Jianghong1,2, XUE Qianqian3, ZHANG Jun2, LUO Lin3, MA Jiaxing2
1 College of Architecture & Environment, Sichuan University, Chengdu 610065, China 2 School of Civil Engineering and Architecture, Ningbo Tech University, Ningbo 315100, Zhejiang, China 3 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Abstract: The effect of resting time on the reinforcing steel bar's fatigue performance after electrochemical repair was investigated in this work. The fatigue life, hysteresis curve, residual strength and other mechanical property indexes were obtained by experiments. And the Low-cycle fatigue constitutive model of reinforcing steel bar was established based on experimental data. The effect of resting time on the seismic performance of the bridge pier after electrochemical repair was investigated via numerical simulation. Results show that the fatigue life and total energy dissipation capacity of the reinforcing steel bar after electrochemical repair decreas by 12%—23% and 13.2%—30%, respectively. The softening stage is advanced with the current density increasing. Meanwhile, the development of plastic damage, strength and stiffness reduction rates were accelerated. The fatigue performance of reinforcing steel bar basically recovers to the level of control group after a resting time of 30 d, including the delaying of softening stage and the recovering of plastic properties. The fatigue performance degradation of reinforcing steel after electrochemical repair will lead to the energy dissipation capacity decrease and ductility degradation of reinforced concrete component which can also recover with the resting time.
毛江鸿, 薛倩倩, 张军, 罗林, 马佳星. 电化学修复后钢筋低周疲劳性能退化的时间效应及其影响[J]. 材料导报, 2022, 36(12): 21050263-7.
MAO Jianghong, XUE Qianqian, ZHANG Jun, LUO Lin, MA Jiaxing. Time Effect of the Low Cycle Fatigue Property Degradation of Reinforcement After Electrochemical Repair and Its Influence. Materials Reports, 2022, 36(12): 21050263-7.
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2022, Vol. 36 
