Abstract
Many structural elements are subjected to the effects of combined torsional and flexural movements. This paper presents an extension of an existing simplified method for combined stress-resultants model. The extension is used for the design and analysis of reinforced and partially- and fully-prestressed concrete beams subjected to combined torsional and bending moments. The interaction between torsion and flexure is achieved by superposing the steel required for the two moments. The observed ultimate loads of 111 beams are compared with the calculations of the proposed model. This includes comparing interaction diagrams and the effects of concrete strength, stirrups spacing, and T-beam flange width on the ultimate capacity. Very good agreement was obtained. The calculations by the American Concrete Institute code equations are also evaluated and shown to give satisfactory and, in some cases, overly conservative, results. Design and analysis examples are used to demonstrate the simplicity of the proposed model.
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