Research Of Bond Behavior Between Reinforcing Bar And Concrete

It is collectively referred to as reinforcing bar which is able to be in the cooperative work with concrete, and improve the bearing capacity of concrete structure and component. The reinforcing bar basically is:reinforcing steel bar and fiber reinforce plastic rebar (FRP rebar) in the reinforcing bar concrete structure. But, it is some insufficient in the reinforcing bar concrete theory. In especial, the basis of reinforcing bar concrete theory-the bond of reinforcing bar and concrete-is not formed the system theory, and these disadvantages limit the development and application. Because of these insufficient, it is obtained the system theory of the bond of reinforcing bar and concrete and introduced bond mechanism, stress process, influence factors, bond strength, bond length and constitutive relation and embedment length in this paper. And it is especially researched and completed as following works:(1) It is obtained the theoretical calculation methods of limit load via macro analysis of reinforcing bar and concrete, and theoretical calculation methods of ultimate bond strength of reinforcing bar and concrete via microscopic analysis of reinforcing bar and concrete. And it is synthesized the macroscopic and microscopic results, and obtained the practical calculation method of bond of reinforcing bar and concrete. Finally, it is contrasted the data of theoretical calculation and experiment, and found that experiment is consistent with theory.(2) It is obtained the theoretical calculation methods of bond-slip constitutive relation via microscopic analysis of reinforcing bar and concrete, and bond stress distribution and macro bond-slip constitutive relation via theoretical and finite element analysis. Finally, it is contrasted the data of theoretical calculation and experiment, and found that experiment is consistent with theory.(3) In order to promote the development of the theory and application in engineering of reinforcing bar concrete, it is obtained the reliability analysis via the center point algorithm and checking point algorithm and embedment length design suggestions according with existing code for safety level.