摘要
鉴于现在广泛应用的拉拔式试验结果不能反映实际受弯构件中钢筋与混凝土的粘结性能,设计了梁式试件来研究钢筋与混凝土之间粘结性能。采用半干法的钢筋通电快速锈蚀法对钢筋进行锈蚀。在此基础上,对锈蚀钢筋的混凝土梁受力各阶段特征点的粘结应力及滑移值进行试验测定,拟合出粘结滑移曲线及锈蚀对粘结性能影响曲线。基于试验数据,提出了锈蚀率及锈胀裂缝宽度对钢筋与混凝土粘结强度影响系数的建议表达式。
In view of the fact that pull - out test can not reflect the bond behavior of practical flexural member be- tween concrete and corroded steel bar, the device of beam model experiment was designed to study the bond be- havior between concrete and corroded steel bar. The semidry accelerated corrosion method with current was used simultaneously. On the basis, the bond strength and free - end slip of the corrosion reinforced concrete beam un- der various loading stages were measured by experiment, and nonlinear fitting curves were made to disclose the bond stress - slip relationship and the influence of reinforcement corrosion on the bond characteristics of rein- forced concrete. Besides, on the basis of test data, the bond strength effect coefficient was recommended here, which can be used to easily calculate the bond strength of corroded steel bars and concrete in the states of different corrosion ration and crack width.
出处
《铁道科学与工程学报》
CAS
CSCD
2009年第4期28-31,共4页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50578068)
关键词
梁式试验
锈蚀钢筋
滑移曲线
粘结性能
beam model experiment
corroded steel bar
bond-slip curve
bond behavior
