The Study On Calculation Of Torsional Capacity For The Compound Torsion Members Of Closed Steel Reinforced Concrete

Based on fully exerting both concrete and steel material property,the SRC structure shows serious advantages in improved aseismic capacity,great strength,fine fire and corrosion proof performace,excellent ductility and easy in construction.Therefore,high-frequency seismic region,large-span structure,tall and super high-rise structures are more extensive use of the SRC structures.However,the present situation,the study of SRC sonstruction at home and abroad compared with the actual construction is still in a state of relative lag,which there are many key scientific and technological problems need to be resolved,such as the study on calculation of torsional capacity for the compound torsion members of closed SRC.So far,Chinese relevant regulations don't give the relevant method and formulas calculating the Torsion bearing capacity of the SRC members.To solve the above problems,the research on the torsional behavior and the formula of the bearing capacity of the closed SRC under the combined torsion is carried out in the following aspects.(1)In this paper,finite element simulation of closed SRC members subjected to composite torsion is carried out by ABAQUS finite element simulation software.In the process of simulation analysis,the component unit type and material property are selected,and the detailed operation steps of the software are introduced.(2)By using some affecting factors of non-linear finite element analysis like the steel constraint range,the vary of the reinforcement ratio,steel ratio and steel form parameters,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)On the basis of the constitutive relation of concrete,reinforcement and steel,based on the ABAQUS finite element simulation,combined with plasticity theory and the non-linear analysis of concrete,assumed that the deformation between the three isconsistent,and the bond slip between the three is neglected,this paper establishe a cracking torque and limit torque formula.