Advanced Prestressed Concrete Part 6: Transverse Design of Double Tee Flanges-Advanced Precast, Prestressed Concrete Module 6: Special Topics

Advanced Precast, Prestressed Concrete Module 6: Special Topics

Pdf Summary

The document outlines an advanced course on Prestressed Concrete Design, led by Sergio F. Breña from the University of Massachusetts Amherst. The course includes six sessions covering various topics crucial in prestressed concrete design, such as torsion design, ledge design, bearing on concrete, dapped end design, design of axially loaded members, corbel design, and special topics.<br /><br />One significant segment focuses on the transverse design of double tee (DT) flanges, which involves understanding how to design and detail DT flanges under transverse bending stresses. It includes methods like elastic plate solutions, yield-line theory, and the effective slab width method, with the latter preferred for its simplicity. The effective slab width method assumes a certain width of the slab is effective in resisting applied loads, affecting transverse design.<br /><br />Details are provided for determining transverse flexural strength, factoring uniform dead and live loads, and concentrated loads to design flanges for maximum moments. Additionally, practical examples and calculations illustrate designing DT flanges under various loading conditions, including handling construction loads and in-service conditions.<br /><br />The document also covers specific design recommendations for web openings in beams, noting that web openings must be positioned to avoid high shear zones and strand development regions. Research-based design procedures, such as those by Kennedy, Abdalla, and Barney et al., are referenced for guidance on handling shear and preventing cracking around openings.<br /><br />Finally, the document addresses the warping (twisting) of double tees to facilitate drainage. Various practical considerations and methodologies, including those proposed by Mack et al. and Banks et al., are discussed. These guidelines assist in estimating torsional stresses in double tee sections and evaluating potential flange cracking due to warping.<br /><br />Overall, the comprehensive overview and detailed design examples aim to equip participants with specialized knowledge in advanced prestressed concrete design.

Keywords

Prestressed Concrete

Sergio F. Breña

University of Massachusetts Amherst

Double Tee Flanges

Transverse Bending Stresses

Effective Slab Width Method

Web Openings

Torsional Stresses

Shear Zones

Flange Cracking