421.1R-20: Guide for Shear Reinforcement for Slabs

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Description

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

Keywords:

column-slab connection; concrete flat plate; headed shear studs; moment transfer; prestressed concrete; punching shear; shear heads; shear stresses; slabs; two-way slabs.

 

Document Details

Author: Joint ACI-ASCE Committee 421

Pages: 28

ISBN: 9781641950893

Categories: Shear

Formats: PDF

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE

1.1—Introduction

1.2—Scope

1.3—Evolution of the practice

CHAPTER 2—NOTATION AND DEFINITIONS

2.1—Notation

2.2—Definitions

CHAPTER 3—ROLE OF SHEAR REINFORCEMENT

CHAPTER 4—PUNCHING SHEAR DESIGN EQUATIONS

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

5.1—Nominal shear strength

CHAPTER 6—TOLERANCES

CHAPTER 7—MOMENT TRANSFER AT SLAB-COLUMN CONNECTION

7.1—Shear stress due to moment transfer Msc

7.2—Reduction of γv

7.3—Anchorage of shear reinforcement

7.4—Layout of shear reinforcement

7.5—Minimum shear reinforcement

CHAPTER 8—REFERENCES

Authored documents

APPENDIX A—DETAILS OF SHEAR REINFORCEMENT

A.1—Geometry of shear reinforcement

A.2—Stud arrangements

A.3—Stud length

APPENDIX B—PROPERTIES OF CRITICAL SECTIONS OF GENERAL SHAPE

APPENDIX C—VALUES OF vc WITHIN SHEAR-REINFORCED ZONE

APPENDIX D—DESIGN EXAMPLES

D.1—Interior column-slab connection

D.2—Edge column-slab connection

D.3—Corner column-slab connection

D.4—Prestressed slab-column connection

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