基于压磁效应的钢筋疲劳损伤试验研究

发布时间：2018-04-22 22:23

本文选题：压磁效应 + 钢筋疲劳损伤　；参考：《浙江大学学报(工学版)》2017年09期

【摘要】：对17个HRB400热轧钢筋加工的标准试件进行轴向拉伸疲劳试验,并通过实时记录试件周围的压磁信号,研究疲劳过程中压磁信号的演变规律.结果表明:HRB400钢筋的压磁信号对疲劳损伤很敏感,相比应力-应变滞回曲线更能反映疲劳损伤过程;在静力加载与循环加载过程中,压磁信号曲线都存在一个相对稳定的极值比;不同疲劳阶段的压磁滞回曲线存在显著差别,根据滞回曲线极值点的变化可预测疲劳失效;比较2个磁探头信号的曲线特征可初步判断失效的位置;试验得到的压磁信号演化过程符合疲劳三阶段规律,据此提出一个预测钢筋剩余疲劳寿命的方法.
[Abstract]:Axial tensile fatigue tests were carried out on 17 standard specimens processed by HRB400 hot rolled steel bar. The evolution of piezomagnetic signals during fatigue was studied by recording the piezomagnetic signals around the specimens in real time. The results show that the piezomagnetic signal of the rebar is sensitive to fatigue damage and can reflect the fatigue damage process better than the stress-strain hysteretic curve, and that there is a relatively stable extreme value ratio in the piezomagnetic signal curve during static loading and cyclic loading. There are significant differences in the hysteresis curves in different fatigue stages. Fatigue failure can be predicted according to the change of the extreme point of hysteresis curve, and the location of failure can be preliminarily judged by comparing the curve characteristics of two magnetic probe signals. The evolution process of the ferromagnetic signals obtained from the test accords with the three-stage fatigue law, and a method for predicting the residual fatigue life of steel bars is proposed.
【作者单位】：浙江大学结构工程研究所;浙江大学宁波理工学院;
【基金】：国家自然科学基金资助项目(51278459,51638013) 宁波市科技创新团队资助项目(2011B81005)
【分类号】：TU375

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