电化学修复后不同含氢钢筋的低周疲劳性能试验研究

doi:10.11896/cldb.20020078

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Abstract 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.

Key words： low cycle fatigue of steel electrochemical repair hydrogen content hysteresis curve fatigue life

Published: 23 March 2021

CLC number:

TU375

Fund:National Natural Science Foundation of China (51638013, 51878610, 51908496, 51820105012), the Natural Science Foundation of Zhejiang Province (LQ19E080011, LY18E080003).

About author:: Yuanjun Gong, master of architecture and civil engineering, Chongqing Jiaotong University. His research direction is durability of concrete structures and electrochemical repair.
Jun Zhang, Ph.D., lecturer. He received his Ph.D. in structural engineering from Zhejiang University in 2017. His research work mainly includes the long-term performance and promotion technology for concrete structure. He has published more than 10 SCI/EI papers at home and abroad.

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	GONG Yuanjun
	ZHANG Jun
	MAO Jianghong
	JIN Weiliang
	TAN Yu
	LUO Lin

Cite this article:

GONG Yuanjun,ZHANG Jun,MAO Jianghong, et al. Experimental Study on Low Cycle Fatigue Properties of Different Hydrogen Containing Steel Bars After Electrochemical Repair[J]. Materials Reports, 2021, 35(6): 6146-6150.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20020078 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6146

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