Numerical Simulation On The Bond-slip Behavior Of Steel Reinforced Concrete

With the development of construction techniques and emerging of tall buildings, composite structures emerged. Steel reinforced concrete structure is widely used in the structural design for its excellent performance, domestic and foreign scholars have developed a lot of research work, One of the most important tasks is to study the bond-slip behaviors between steel and concrete, because of the complexity of the problem, it hasn't formed a unified theory, so there exist important theoretical and applied significance to develop the numerical simulation analysis.This paper summarizes the development and application of steel reinforced concrete structures in home and abroad; the basic problems and mechanism of bond-slip of SRC structures is introduced, as well as the study results of bond-slip properties and the still existing problems. The current common method of handling the numerical simulation about concrete constitutive relation against the decline phase is summarized.A mathematical model of the bond stress between steel shapes and concrete was established through the theoretic analysis of the bond stress. The entire mechanical behavior of concrete and reinforced concrete short columns is analyzed through arc-length method, considering the constitutive relation against the decline phase. And the feasibility of using ANSYS software to analyze the limit bearing capacity of concrete structures is discussed.Nonlinear finite element analysis of SRC short columns using ANSYS software is conducted and the mechanical behaviors of these columns are analyzed. The load-displacement curve is gained when the bond-slip behavior between steel and concrete is unconsidered; on this basis, the bond-slip numerical model is established, adopting a link-element composed of a nonlinear spring element named combination-39 element in the ANSYS program to represent the interaction on interfaces between shape-steel and concrete at different positions. The numerical simulation results were agreement with the experimental results conducted in the article.