| It is common to see that the compatible distortion which reverses coordinated by the main beam of the overall frame work of the reinforced concrete structure. As for the overall structure of the the reinforced concrete frame, being different from the elasticity calculation which doesn't take the factor of floor into consideration, the compatible reverse's torque varies with floor restraint and the nature of the elastic-plastic properties. In order to adjust torque to meet the design requirements, the torsional reduction coefficient is introduced in the present structural design software. The research of the reasonableness of the coefficient and analysis of relevant factors are necessary for the economic and secure design of the structure, simultaneously the choice of reasonable bending moment amplitude modulation coefficient is also very necessary for a reasonable structure design in a reinforced concrete frame design.This paper begins with the analysis on the factors that effect the beam torque changes, then a single layer of reinforced concrete frame structure is analyzed elastically with SAP2000. Taking the floor thickness, ratio of stiffness of beam into account to obtain the obvious influence factor, the results got from SAP2000 analysis is also contrasted with the SATWE calculated value in the paper. Finally, in the paper the reasonable torsional reduction coefficient in the elasticity working stage is worked out with the regression analysis.Reasonable value of bending moment amplitude modulation coefficient of the end of frame beam has made the structure of the project more convenient, more economical and more reasonable. Finite element software ANSYS is adopted in the paper to conduct a nonlinear analysis of the two cross simple frame beam. The reasonable value of the amplitude modulation is obtained by a nonlinear analysis of the amplitude modulation coefficient and crack opening's diagram of curves.
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