摘要
本工作通过电化学充氢试验和低周疲劳试验,分析了电化学修复后含氢钢筋的疲劳寿命、滞回曲线、剩余强度等关键力学指标。研究结果表明:钢筋试件通电时间越长、电流密度越大,钢筋内氢含量越多,且钢筋氢含量与电通量密度呈线性关系;依据氢含量与疲劳寿命的关系可将电化学修复的负面影响程度分为A、B、C三个区域;随着氢含量增大,循环剩余强度退化加快,疲劳寿命和耗能能力降低也越显著;氢含量小于1.7×10^(-6)时,1%应力幅下钢筋试件低周疲劳寿命降低小于15%;氢含量为4.3×10^(-6)时,钢筋试件低周疲劳寿命降低73.7%。本研究结果可为电化学修复技术应用于有抗震性能要求的混凝土结构提供参考。
This paper attempts to analyze the fatigue life,hysteresis curve,residual strength and other mechanical indexes of steel bars with hydrogen by virtue of experiment on electrochemical hydrogen permeation and low cycle fatigue.Results show that the longer the electrification time and the higher the current density,the more the hydrogen content in the steel.And the linear relationship between the hydrogen content and the electric flux density is established.According to the relationship between the hydrogen content and the fatigue life,the negative effects of the electrochemical repair are divided into three areas.With the increasing hydrogen content,the degradation of the cyclic residual strength accelerates,meanwhile the fatigue life and energy consumption capacity decrease significantly.When the hydrogen content is less than 1.7×10^(-6),the low-cycle fatigue life of steel specimens decreases by less than 15%with 1%strain range.When the hydrogen content is 4.3×10^(-6),the low-cycle fatigue life of the steel specimens decreases by 73.7%.This study provides a reference for the application of electrochemical repair technology on concrete structures with seismic requirements.
作者
龚园军
张军
毛江鸿
金伟良
谭昱
罗林
GONG Yuanjun;ZHANG Jun;MAO Jianghong;JIN Weiliang;TAN Yu;LUO Lin(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Ningbo Tech University,Ningbo 315100,China;Zhejiang Zhoushan North Channel Co.,Ltd.,Zhoushan 316000,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第6期6146-6150,共5页
Materials Reports
基金
国家自然科学基金(51638013,51878610,51908496,51820105012)
浙江省自然科学基金(LQ19E080011,LY18E080003)。
关键词
钢筋低周疲劳
电化学修复
氢含量
滞回曲线
疲劳寿命
low cycle fatigue of steel
electrochemical repair
hydrogen content
hysteresis curve
fatigue life
