Analysis and design for torsion in reinforced and prestressed concrete beams

This paper presents a simplified method for the design and analysis of non-prestressed,<br />partially prestressed, and fully prestressed concrete beams subjected to pure torsion. The proposed model<br />relates the torsional strength to the concrete compressive strength and to the amounts of transverse and<br />longitudinal reinforcement. To check the adequacy of this simple method, the calculated strength and<br />mode of failure are checked against the experimental results of 17 prestressed concrete 66 reinforced<br />concrete beam tests available in the literature, and very good agreement is found. The simplicity of the<br />method is illustrated by two examples, one for design and another for analysis.