The Finite Element Analysis And Research For Torsion Performance Of Different Types Of Steel-reinforced Concrete Member Subjected To Pure Torsion

Steel reinforced concrete is selected for study in this paper. By the finite elementanalysis for11SRC specimens，studying the performances of SRC subjected to puretorsion with the change of main influence factors, which are divided into groups. Withthe foundation of analysis metadata，combining the classical theory and the traditionalstrength superposition principle，established the equation of the cracking torque andultimate torque of two kinds of SRC, the rectangular cross-section and the H-shapedcross-section.The content is summed up in the following respects:(1)This paper selects the representative RC and H-shaped SRC members to becontrasted each other for my study. The load-displacement curve, stress condition ofsteel bar and concrete, as well as the stress and deformation condition of steel in SRCare analyzed by studying each specimen separately. The torsion properties of two kindsof components are discussed. Discussing the effect on concrete members by thepresence of steel，And the differences and similarities in force mechanism between themare also studied.(2)The limitations and conservative of the traditional strength superpositionprinciple is explored by simulating the standard SRC members and their correspondingbox hollow concrete member and concrete filled steel rectangular tubes.(3) With the foundation of the traditional strength superposition principle research,torsion properties of SRC members by the different range of constraint between steeland concrete is discussed by setting and comparative studying of3SRC members whichcontain the same section modulus in torsion.(4)Three important parameters which affect the pure torsion performance of SRCare studied. By contrasting three SRC members which contain different reinforcementratio and three SRC members which contain different stirrup reinforcement ratio,theeffect on its torsional behavior by the change of the reinforcement ratio and stirrupreinforcement ratio are summed up based on keeping other parameters being constant.By contrasting two members which contain different shaped cross-section of the SRCsteel, analyzing t the effect on its torsional behavior by the change of steel.(5)The equation of the cracking torque two kinds of SRC, the rectangular cross-section and the H-shaped cross-section, subjected to pure torsion is obtainedbased on the finite element analysis in ABAQUS and the traditional superpositionprinciple. The correctness of this formula is also validating by contrasting the finiteelement analysis results in ABAQUS and the calculated results.(6)The equation of the ultimate torque of two kinds of SRC, the rectangularcross-section and the H-shaped cross-section,are obtained firstly separately by thesuperposition principle, taking into full account of the constraint effect between steelbar and concrete in RC and the constraint effect between steel and concrete in SRC,based on variable-angle spatial truss model and add revision coefficients. Thepreliminary correctness of this formula is also validating by contrasting the finiteelement analysis results in ABAQUS and the calculated results.