Numerical Analysis On Torsional Property Of Steel Reinforced Concrete Members Under Axial Compression And Torsion

With the steel reinforced concrete structure widely used in building structure,the research on bearing capacity of steel reinforced structure becomes increasingly important.What's more,the torque load is widespread in building structure.In this paper,the torsional behavior of steel reinforced concrete member is analyzed by the torsion theory and research method of reinforced concrete members.The specific content of this article has the following aspects:(1)In this paper,the ABAQUS finite element software was used to create the reinforced concrete torsion member model and the steel reinforced concrete torsion member model.The constitutive relation and failure criterion of concrete,steel bar and structural steel are analyzed.During the modeling process,the bond-slip action between the concrete and the section steel is taken into account and the accuracy of the model analysis process is ensured.(2)Through ABAQUS finite element software on the analysis of steel reinforced concrete pure torsion member and compression torsion member,the failure modes,crack development and distribution of SRC under pure torsion and compression load are revealed,the strength,stiffness and load-displacement curves of the steel reinforced concrete members subjected to torsion are obtained,which reflects the crack torque limit torque and deformation performance.(3)Steel reinforced concrete members are divided into two groups.The first group of five components,with different axial compression ratio as the parameter,mainly studied the damage characteristics,bearing capacity and deformation properties of the member under the compression torsion load;the second group of five components,fixed axial compression ratio,from the stirrup change,steel size,steel form three main aspects of the impact of different factors affecting the torsional behavior of steel reinforced concrete compression components.(4)In view of the torsional characteristics of box-shaped steel and concrete members,this paper argues that the box-shaped steel has played a role in the early stage of torsion because of the large torsional rigidity of the box-shaped steel.Based on the superposition principle and considering the influence of the interaction coefficient between the concrete and the structural steel,the formulas for calculating the cracking torque and ultimate torque of the box-shaped SRC are obtained.