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.
金浏, 张晓旺, 郭莉, 吴洁琼, 杜修力. 加载速率对锈蚀钢筋与混凝土粘结性能的影响[J]. 材料导报, 2024, 38(8): 22100011-9.
JIN Liu, ZHANG Xiaowang, GUO Li, WU Jieqiong, DU Xiuli. Effect of Loading Rate on the Bond Capacity Between the Corroded Reinforcing Bars and Concrete. Materials Reports, 2024, 38(8): 22100011-9.
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