摘要
光圆钢筋与混凝土的粘结作用主要通过胶着力和界面摩擦粘结作用实现,冻融循环作用将削弱或破坏钢筋与混凝土之间的粘结性能。通过光圆钢筋与混凝土在遭受冻融循环作用后的粘结性能试验研究,分析光圆钢筋与混凝土粘结性能随着冻融循环作用次数增加的退化规律;基于静水压力理论和粘着摩擦理论,分析冻融循环对光圆钢筋与混凝土粘结性能破坏的作用机理。研究结果表明:钢筋混凝土在其受冻界面上产生的最大静水压力超过了钢筋与混凝土的正向胶结作用,致使冻融后钢筋与混凝土的粘结强度迅速下降。
The bond between plain steel bar and concrete mainly includes gumming force and bond friction on the interface,the bond behavior can be weakened or destroyed after freezing and thawing.The bond behavior between steel bar and concrete after freezing and thawing was studied.The bond degradation was discussed based on analyzing the experimental data.Based on the theory of hydraulic pressure and bond friction,the mechanism of bond degradation after freeze-thaw cycling was investigated.The results show that the hydraulic pressure maximal value on the interface between concrete and steel bar after freezing and thawing is larger than the cross section adhesion,which is the main reason of bond strength decreasing.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2011年第1期70-74,共5页
Journal of Building Structures
基金
国家自然科学基金项目(50679007)
