Report on Torsion in Structural Concrete: Chapter 8 and 9-Report on Torsion in Structural Concrete Chapter 8 and 9 (PDF)

Report on Torsion in Structural Concrete Chapter 8 and 9 (PDF)

Pdf Summary

This document is a comprehensive report on the effects of torsion in structural concrete, detailing its critical aspects for the safe and economical design of reinforced and prestressed concrete members. It emphasizes the historical evolution of torsion theories, including contributions from pioneers like Navier and Saint-Venant, as well as modern theories like the compression field theory (CFT) and the softened truss model (STM). Emphasizing theoretical foundations, it highlights that members must satisfy equilibrium, compatibility, and constitutive conditions of materials, especially focusing on the stress-strain relationships.<br /><br />The report discusses how members react to torsion combined with other forces such as bending, axial load, and shear. It also addresses various design issues related to torsion, such as compatibility torsion, spandrel beams, torsional limit design, and the effects of open sections and size. Furthermore, it includes detailing requirements for torsional members with extensive examples of reinforced and prestressed concrete beams under torsional stress following standards like ACI, European, and Canadian.<br /><br />It also offers illustrations of detailing standards for transverse and longitudinal reinforcement requirements, emphasizing the need for precise reinforcement configurations to handle torsional forces. The report includes two detailed design examples: a simple rectangular concrete beam under pure torsion and a prestressed box girder subjected to combined loading, analyzing each according to international standards.<br /><br />In summary, the document underscores the importance of meticulous planning and analysis in torsional design to ensure safety and efficiency in concrete structures. It is a vital resource for professionals in the field, offering guidelines on historical and current theories, design scenarios, and reinforcement detailing. For a complete understanding, acquiring the full document through the ACI Store is recommended.

Keywords

torsion

structural concrete

reinforced concrete

prestressed concrete

compression field theory

softened truss model

stress-strain relationships

design standards

reinforcement detailing

concrete beams