高强钢筋高强混凝土粘结性能的试验与分析

通过对48个高强钢筋高强混凝土试件的拉拔试验,研究影响高强钢筋与高强混凝土之间粘结性能的主要因素。对试件破坏现象进行分析,在试验的基础上对不同基体间典型的荷载滑移曲线进行比较。研究表明:与其他基体类似,高强钢筋高强混凝土间粘结强度随锚固长度的减小、配箍率的提高、保护层厚度的增大、锚筋屈服强度及混凝土强度的提高而增大;通过比较荷载滑移曲线可看到,高强钢筋高强混凝土间的粘结刚度较其他基体大,且退化速度相对较慢。

EXPERIMENT AND ANALYSIS OF BOND PERFORMANCE BETWEEN HIGH-STRENGTH REINFORCING BAR AND HIGH-STRENGTH CONCRETE

It is studied the main affection on bond performance between high-strength reinforcing bar and high-strength concrete by pull-out experiment of 48 specimens. It is analysed the causes of devastating phenomenon and compared to the classical load-slip curves of different base based on experiment. The test results revealed that its bond strength increases by decreasing anchorage length and increasing stirrup ratio, thickness of concrete cover, yield strength of reinforcing bar, concrete strength, which is similar to other base. Its bond stiffness is bigger and the degraded speed is slower than other base by the comparison of load-slip curves.