The Nonlinear Finite Element Analysis And Research For Torsion Performance Of Steel Reinforced Concrete Member Subjected To Pure Torsion

Steel reinforced concrete structures are replied more and more widely in the practical engineering applications in recent years. Combining of two kinds of steel and concrete material performance advantages, it shows more excellent performance than steel structure and reinforced concrete structure in aspects of strength, stiffness,ductility and energy dissipation. At present there are few domestic research of the torsion properties of the steel reinforced concrete structures. It has important practical significance on studying of pure torsional stress behavior of steel reinforced concrete structures. In this paper, based on the FINITE ELEMENT ANALYSIS ANAQUS, it studied the searches about steel reinforced concrete structures under the action of the pure torsion through finite element analysis of 18 components.Adopting the method of finite element nonlinear analysis, this paper analyzed the components of nonlinear finite element under the action of the pure torsion of steel reinforced concrete. Applied the concrete damage model available in ABAQUS reflecting the stiffness degradation phenomenon of concrete, based on the coulomb friction model "PENALTY" function to reflect the interaction relationship between steel and concrete, through the test component of numerical analysis, the results obtained were in good agreement with the test structure.Through establishing Reinforced concrete members by finite element software ABAQUS, the steel reinforced concrete structures, steel reinforced concrete hollow components of numerical model, it discussed the various stages of the concrete, steel bar, the stress and displacement deformation of the steel case and made a research of reinforced concrete, steel reinforced concrete and hollow steel concrete component force mechanism of the differences and similarities.By means of numerical simulation of 8 steel reinforced concrete components, as the steel constraint range, aspect ratio, steel ratio, steel form parameters for research, it studied the section size shape change effect on torsional performance of steel reinforced concrete structure.In this paper, based on the traditional intensity superposition principle, considering the interaction between steel and concrete, it put forward the new method of superposition, which as hollow rectangular steel reinforced concrete member as contrast artifacts and through the study of finite element numerical model of 12 member toverify the effectiveness of the new method of superposition and accuracy.On the basis of the results of numerical model analysis, combined with relevant torsion bearing capacity theory, this paper deduced theoretically hollow and Micronesia steel reinforced concrete component cracking torque, ultimate torque calculation formula. Based on the variable Angle space truss model and intensity superposition principle, through analysis of the data regression model, considering the interaction between steel and concrete, it calculated the correction coefficient for the first time,improving the calculation precision of the formula, preliminary verified the correctness of this formula through the comparison and test components.