加载速率对锈蚀钢筋与混凝土粘结性能的影响

doi:10.11896/cldb.22100011

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Abstract To investigate the effect of loading rate on the bond capacity between corroded reinforcement and concrete, 16 RC beams (mass loss rate of 0%—8.7%) were tested under different loading rates (0.5—300 mm/min). Based on the above data, the bond strength prediction model was proposed incorporating the effect of loading rate and steel corrosion. Meanwhile, the bond capacity of corroded RC beams was numerically simulated, in which the effects of high loading rates (30—30 000 mm/min, strain rates of 10^-4—10^-1 s^-1) were analyzed. Results show that: (1) loading rates rarely influence the shape of the bond stress-slip curve of corroded RC beams, and the ratio of the bond strength over the resi-dual bond strength; (2) with the increase of loading rate, the bond strength and residual bond strength between corroded steel and concrete significantly increase, and the steel stress at peak within the bond zone obviously increases with gradually approaching the loading end; (3) the proposed bond strength prediction model incorporating the effects of loading rate and steel corrosion can be applied within the loading rates of 0.5—30 000 mm/min.

Key words： loading rate steel corrosion bond performance numerical simulation

Published: 25 April 2024 Online: 2024-04-28

CLC number:

TU528

Fund:National Natural Science Foundation of China (52108106) and the National Key R ＆ D Program of China (2019YFC1511003).

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	JIN Liu
	ZHANG Xiaowang
	GUO Li
	WU Jieqiong
	DU Xiuli

Cite this article:

JIN Liu,ZHANG Xiaowang,GUO Li, et al. Effect of Loading Rate on the Bond Capacity Between the Corroded Reinforcing Bars and Concrete[J]. Materials Reports, 2024, 38(8): 22100011-9.

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https://www.mater-rep.com/EN/10.11896/cldb.22100011 OR https://www.mater-rep.com/EN/Y2024/V38/I8/22100011

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