Experimental Study On Bond Slip Of Steel Reinforced High-strength Concrete

The steel reinforced high-strength concrete structure is one of the major directions of the development of the modern construction field,and its application scope in the construction field will be more and more extensive.The research on bond slip of steel reinforced high-strength concrete is still an important topic.In this paper,14 groups of specimens were made,and the influence factors including concrete grade,stirrup spacing and anchorage length were studied by the push-out test method.The main research contents are as follows:(1)Observe the crack development and failure pattern of the specimen during loading,draw the load-slip(P-S)curve,analyze and summarize the curve law;(2)Draw the strain-displacement of each specimen based on the slip data(ε-S)Curve,get the corresponding fitting formula,and study the influence of influencing factors on the curve;(3)Based on the loading data,the characteristic bond strength of each specimen is calculated,and the influence of various influencing factors on the characteristic bond strength is studied;(4)Formulas for calculating the effective anchorage length and effective bond strength are derived to obtain the effective bond stress-slip(τ-S)Curve,analyze the whole process of the curve,and study the key influencing factors at each stage;Through this study,the bond theory is summarized and the curve relationship is drawn,which can provide experimental basis and data reference for the theoretical calculation and numerical simulation of bond slip of steel reinforced high-strength concrete.