摘要
通过梁式试验法研究了锈蚀对配箍钢筋混凝土构件粘结性能的影响,探讨了试件表面锈胀裂缝宽度和钢筋锈蚀率对极限粘结强度及钢筋自由端滑移量的影响规律.试验研究表明,钢筋混凝土梁表面纵向锈胀裂缝产生与否及其宽度大小,并不是影响配箍构件粘结性能的本质因素,它与粘结强度或滑移性能的相关性均不显著.锈蚀率对粘结性能有着重要影响,极限粘结强度和粘结刚度均随锈蚀率增加先增大后减小,但锈蚀率在5%以内时不会低于未锈蚀钢筋水平;达极限粘结强度时,钢筋自由端滑移量随锈蚀量增加明显减小,当锈蚀率为4.6%时滑移量仅为未锈蚀梁的17.6%.
Beam tests were conducted to study the bond behavior of corroded steel bar in concrete. The effects of surface crack width and corrosion percentage of steel bar on the ultimate bond strength and the free end slip of reinforcement bar were investigated. Based on the study, the following conclusions had been reached. Surface crack width had little influence on bond strength of corroded RC members with stirrups and free end slip, while the corrosion percentage had strong effect on bond behavior. With the increase of the corrosion percentage, the ultimate bond strength and bond stiffness increased first and then decreased, but they will not be weakened within 5% corrosion. The free end slip at the ultimate bond strength decreased rapidly as the corrosion level increased, the free end slip at 4. 6% corrosion was only 17.6% of that of noncorroded specimens.
出处
《应用基础与工程科学学报》
EI
CSCD
2009年第4期549-557,共9页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(50278039
5078068
50538070)
