In order to investigate the behavior of bond slip between shape steel and high strength concrete after high temperature and water cooling,19 steel reinforced high strength concrete specimens were designed for the push out test.The appearance change and crack propagation of the specimen were observed,the load-slip curves with the characteristic point parameters,such as ultimate bond strength and residual bond strength,were gotten.The influence of various parameters on the bond strength bond,bond shear stiffness and energy dissipation capacity was researched.The results show that the bond strength and shear stiffness of specimens decrease,while the energy dissipation capacity increases with the constant temperature increasing.With the strength grade increasing,the bond strength generally increases,the shear stiffness fluctuates and the energy dissipation capacity changes slightly.With the increase of constant temperature duration,the bond strength and shear stiffness of the specimen increase,but the energy dissipation capacity decreases.The constant temperature has a significant influence on the interface shear strength and energy dissipation capacity.Moreover,the interface bond damage of the specimens with low temperature developed earlier and more rapidly.Based on the test data,the bond slip constitutive model of steel reinforced high strength concrete and the evaluation formula of bond strength of steel reinforced high strength concrete is proposed,and the calculated values are in good agreement with the measured values.
关键词
高温喷水冷却/型钢高强混凝土/黏结滑移本构关系/剩余黏结强度评估
Key words
high temperature and water cooling/steel reinforced high strength concrete/bond slip constitutive relation/evaluation of residual bond strength
万方数据