Finite Element Analysis On Bonding Property Of Reinforced Concrete

The beam-slab structural high-piled wharf is applied widely in silt coast. However, because of the increase of the construction scale and speed and useful time, the durability and safety problem of high-piled wharf becomes more serious. And the structural safety problem due to reinforcement corrosion and fatigue has been paid closer attention to. Consequently, the reason is that bond strength of reinforcement and concrete decreases and the structure has debonding failure. Therefore, it is of great significance in the research on bonding property of reinforced concrete.This paper firstly summarizes the factors affecting the bonding property of reinforcement concrete, discusses the basic concept, properties and mechanism of bond, and makes clear the research direction. Furthermore, the effect on strength weakening and cementing degradation of reinforcement caused by corrosion is studied. The formula describing the reinforcement strength changed by corrosion rate and the bonding degradation coefficient of reinforcement corrosion are introduced. In addition, the bonding property of reinforced concrete under the fatigue loading is studied.Based on the theory and calculation formula on bonding property of reinforced concrete, this paper develops the finite element software ANSYS to establish the bond-slip model which includes concrete strength, reinforcement corrosion, fatigue loading and other factors. With the introduction of reinforcement corrosion influence coefficient, the Combine39 nonlinear spring element is applied to connect reinforcement element and concrete element, and simulate the bond-slip relation between reinforcement and concrete. The finite element calculation obtains some results and provides a parametric research method to the analysis of cementing power influence factor. The model program written by parametric language APDL, which simplifies the writing process and increase the calculation efficiency, establishes the foundation for further finite element calculation considering bond-slip property and has certain value in engineering application.