ACI 421.1R-08 - Guide to Shear Reinforcement for Slabs

Tests have established that punching shear in slabs can be effectively resisted by reinforcement consisting of vertical rods mechanically anchored at the top and bottom of slabs. ACI 318 sets out the principles of design for slab shear reinforcement and makes specific reference to stirrups, headed studs, and shearheads. This guide reviews other available types and makes recommendations for their design. The application of these recommendations is illustrated through numerical examples. 23pp.

Contents:

Chapter 1-Introduction and scope, p. 421.1R-2
• 1.1-Introduction
• 1.2-Scope
• 1.3-Evolution of practice
Chapter 2-Notation and definitions, p. 421.1R-2
• 2.1-Notation
• 2.2-Definitions
Chapter 3-Role of shear reinforcement, p. 421.1R-3
Chapter 4-Punching shear design equations, p. 421.1R-4
• 4.1-Strength requirement
• 4.2-Calculation of factored shear stress vu
• 4.3-Calculation of shear strength vn
• 4.4-Design procedure
Chapter 5-Prestressed slabs, p. 421.1R-9
• 5.1-Nominal shear strength
Chapter 6-Tolerances, p. 421.1R-10
Chapter 7-Requirements for seismic-resistant slab-column connections, p. 421.1R-10
Chapter 8-References, p. 421.1R-10

• 8.1-Referenced standards and reports
• 8.2-Cited references
Appendix A-Details of shear studs, p. 421.1R-12
• A.1-Geometry of stud shear reinforcement
• A.2-Stud arrangements
• A.3-Stud length
Appendix B-Properties of critical sections of general shape, p. 421.1R-13
Appendix C-Values of vc within shear-reinforced zone, p. 421.1R-14
Appendix D-Design examples, p. 421.1R-17
• D.1-Interior column-slab connection
• D.2-Edge column-slab connection
• D.3-Corner column-slab connection
• D.4-Prestressed slab-column connection