摘要
为探究加载速率对锈蚀钢筋与混凝土粘结性能的影响,开展16根RC梁(质量损失率0%~8.7%)在不同加载速率(0.5~300 mm/min)下的粘结性能测试,据此提出考虑加载速率和钢筋锈蚀影响的粘结强度计算公式,并开展锈蚀钢筋混凝土梁粘结力学行为的数值模拟,分析高加载速率(30~30000 mm/min,应变率10^(-4)~10^(-1)s^(-1))下锈蚀梁的粘结滑移力学行为。研究表明:(1)加载速率对锈蚀钢筋混凝土梁式试件的粘结应力-滑移曲线形状以及粘结强度与残余粘结强度的比值影响不大;(2)随着加载速率的增加,锈蚀钢筋与混凝土的粘结强度和残余粘结强度显著增加,粘结区应力峰值显著增加并逐渐向加载端靠近;(3)本工作提出的考虑加载速率和钢筋锈蚀影响的粘结强度计算公式在0.5~30000 mm/min的加载速率范围内有很好的适用性。
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—30000 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—30000 mm/min.
作者
金浏
张晓旺
郭莉
吴洁琼
杜修力
JIN Liu;ZHANG Xiaowang;GUO Li;WU Jieqiong;DU Xiuli(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第8期150-158,共9页
Materials Reports
基金
国家自然科学基金(52108106)
国家重点研发项目(2019YFC1511003)。
关键词
加载速率
钢筋锈蚀
粘结性能
数值模拟
loading rate
steel corrosion
bond performance
numerical simulation
