SRC Torsional Nonlinear Finite Element Analysis Based On The Bond-slip

Steel-reinforced concrete is widely adapted in high-rise buildings because of its extraordinary performance of bearing capacity, fire resistance, durability, and earthquake resistance. There is no regular code of bond slip between steel-reinforced concrete and concrete in technical specification of steel-reinforced concrete structures and Technical specification for steel reinforced concrete composite structure. The former recognizes there is no bond slip between steel ribs and concrete, meanwhile, the later recognizes there should be calculation based on assumption of horizontal scanning interval section. However, quantity of researches demonstrate that the bond slip between steel ribs and concrete should not be ignored. This dissertation adapts finite element software ABAQUS to study sorsion performance of torsion component of steel ribs concrete. The result are as follows:(1) This dissertation studies pattern theory of shaping concrete damage of software ABAQUS which includes foundation of constitutive model and calculation of damage factor. Meanwhile, this dissertation simulates mutual relation of steel ribs and concrete by Cohesive element and Coulomb friction model and also demonstrates its validity.(2) This dissertation considers torsional property under pure torsion effect influenced by many factors of superposition principles, restrain range, longitudinal reinforcement change stirrup change, steel bone form changes and bond slip of steel-reinforced concrete by analyzing 12 ABAQUS components.(3) This dissertation studies torsion ratio-torque curves, equivalent stress distribution, distribution of plastic strain affected and surface compressive stress distribution of steel-reinforced concrete to figure out 4 torsion deformation processes of shape steel-reinforced concrete under torsion activity-elastic process, cracking stage, plastic process and damage process.(4) Theoretical calculating value seems to be lower and conservative comparing the result by adapting addition method with number by finite element analysis. Based on ABAQUS finite element analysis, it founds satisfied calculation method of limited torque of box-shape steel-reinforced concrete under pure torsion activity combined with current specification, pattern theory and plastic theory of the corner space truss on the basis of traditional addition principle.