Research Of Interface Slip Displacement And Constitutive Relation On Src Structures Member

With the development of construction technique, steel reinforced concrete structure is widely used in the structural design, especially in high-rise and super-tall structures engineering, which has significant superiority. The bond-slip between the steel and concrete is the crucial topic of the theoretical research of SRC. Domestic and foreign scholars have developed a lot of research work. Some research findings have been got but it hasn't formed a unified theory. Therefore, the further research on the bond-slip of SRC structures has great theoretical and practical significance. The main researches of the article are as follow:1.The development and application of steel reinforced concrete structures in home and abroad are summarized. According to the theoretical and experimental materials of bond-slip behaviors and constitutive relations, the basic problems and the mechanism of the bond-slip of SRC structures and main influence factors are introduced here. The basic theories, basic concept and research findings of bond-slip constitutive relation are summarized, and the present problems are analyzed in this paper.2.The constitutive relation of bond-slip on steel tube and concrete interface has been established. By using the method of elastic mechanics, constitutive relation in different anchor-hold place of push and pull member on steel tube and concrete interface has been set up, according to the force analysis, equilibrium and boundray conditions of concrete filled square steel tubular column. It lays down the theoretical principle for constitutive relation of SRC members and provides the basis for analyzing the non-linear numerical simulation of SRC members by use of ANSYS.3.Based on the principle of minimum potential energy, the interface slips in concrete filled square steel tubular column is calculated. According to the experimental and theoretical study of bond-slip behaviors of steel reinforced concrete and steel tube concrete, a pull-out mechanics model of concrete filled square steel tubular column has been built. The slip displacement calculation formula on the interface of steel and concrete of the column along the embedment length is derived by the principle of minimum potential energy. The expressions are obtained and numerical calculation and analysis are taken.4. According to the study of bond-slip behaviors of steel reinforced concrete, the slip displacement on the interface of steel and concrete of the column along the embedment length is studied by use of the principle of minimum potential energy. The analysis methods can be applies to other section forms of SRC.