The Study On Torsional Behavior Of Steel Reinforced Concrete Members Under Bending And Torsion

This thesis is based on the theory of torsion calculation of reinforced concrete members,the model of box-shaped steel reinforced concrete flexural and torsional members are created by ABAQUS finite element software,and the forced mechanism and failure characteristic of the members in the bending and torsion are described.The torsional property of the members are studied by different influencing factors,the correlation of bending and torsion in box-shaped steel reinforced concrete members is analyzed,and deduced the formulae for calculating the cracking torque and ultimate torque of box-shaped SRC flexural and torsional members,which are of great significance to application in combined action of bending-shear-torsion of structure.(1)Firstly,this paper introduces the constitutive relation and failure criterion.The SSRBC-2 of specimen in the reference is selected to simulate,then the results of the simulation are compared with the experimental results,show that the coincidence of the two results is more accurate,and indicating that the model modeling method is reasonable and effective.(2)The seven steel reinforced concrete component model(5 bending,a pure twist and a pure bend)are created by software.The mechanical properties of box-shaped steel reinforced concrete members under different bending and twisting ratios are explored.Based on the data obtained from the pure bending and pure torsion members,the bearing capacity and deformation capacity of SRC members under bending and torsion are studied.Then,the models of six steel reinforced concrete flexural and torsional members were established,and the influence of different influencing factors on the torsional performance of steel reinforced concrete flexural and torsional members was investigated.(3)According to the results of finite element analysis,Based on the strength correlation equation of variable-angle truss model,the failure characteristics of the flexural and torsional of the steel reinforced concrete members under the bending and torsion are analyzed.Flexure-torsion-correlation equation of the steel reinforced concrete is deduced.By comparing the value of finite element and formula value,the correctness of the formula is verified preliminarily.this paper innovatively introduces the influence coefficient of bending moment,and puts forward the formula of cracking torque and ultimate torque of box steel reinforced concrete bending and torsion members.