The Study On Nonlinear Finite Element Analysis And Calculation Of Torsional Capacity For The Compound Torsion Members Of Steel Reinforced Concrete

Based on fully exerting both concrete and steel material property, the Steel Reinforced Concrete structure shows serious advantages in great strenghth, excellent ductility, improved aseismic capacity, fine fire and corrosion proof performace and easy in construction. It becomes more widely used in earthquake zone architecture , high-level structures, high-rise structures and large span structures. However, the current study of steel reinforced concrete construction is still lagging behind the demand of the constrction, there are many of the key scientific and technical issues have to be settled urgently, such as research on steel reinforced concrete in the composite sress state under Torsion.China's relevant regulations don't give the relevant method and formulas calculating the Torsion bearing capacity of the steel reinforced concrete members.To solve the above problems, this paper carried out the following aspects of the research on steel reinforced concrete members under combined force.(1) This paper analyzed the steel reinforced concrete members under combined force by method of nonlinear fimite element analysis under monotonic loading. This paper pointed out the selection of cell type and material properties during the analysis process with the software. This provided the referential value for the use of ANSYS software in analyzing twisted steel reinforced concrete structure.(2) By using some affecting factors of non-linear finite element analysis like bending shear to axial compression ratio, section size, concrete strength and steel ratio, this paper studied the change of mechanical properties and crack development law, and determined the major factors that affect the carrying capacity and deformation capacity of the comporcents of the steel reinforced concrete.(3) According to the constitutive relation of concrete and steel , based on the result of analysis, combined with plasticity theory, this paper established a cracking torque formula for the steel reinforced concrete, and this paper also proposed a Torsion bearing formula for the steel reinforced concrete by adopting the super position principle.