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ACI 421.2 2021

ACI 421.2 2021

$31.96

ACI PRC-421.2-21: Seismic Design of Punching Shear Reinforcement in Flat Plates – Guide

Published By Publication Date Number of Pages
ACI 2021 40
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During an earthquake, moments transferred at flat plate-column connections can produce significant shear stresses that increase their vulnerability to brittle punching shear failure. This guide provides recommendations for designing flat plate-column connections with sufficient ductility to withstand reversals of lateral drift without punching shear failure or loss of moment transfer capacity. Reinforced concrete flat plates with or without post-tensioning are discussed in this guide. Keywords: ductility; flat plate; post-tensioning; punching shear; seismic design; shear reinforcement; shear stud reinforcement.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE
4 CHAPTER 1—INTRODUCTION AND SCOPE
1.1—General
1.2—Scope
5 CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
6 2.2—Definitions
7 CHAPTER 3—LATERAL STORY DRIFT
3.1—Lateral-force-resisting systems
3.2—Limits on story drift ratio
3.3—Effects of gravity loads on story drift capacity
9 3.4—Design recommendations for flat plates with and without shear reinforcement
CHAPTER 4—MINIMUM SHEAR AND INTEGRITY REINFORCEMENTS IN FLAT PLATES
10 CHAPTER 5—ASSESSMENT OF DUCTILITY
11 CHAPTER 6—DESIGN MOMENT transferred between slab and column
6.1—Frame analysis
12 6.2—Simplified elastic analysis
13 6.3—Probable flexural strength
14 CHAPTER 7—DESIGN OF SHEAR REINFORCEMENT
7.1—Strength design
7.2—Summary of design steps
7.3—ACI 318 provisions
7.4—Safety in seismic design
16 CHAPTER 8—POST-TENSIONED FLAT PLATES
8.1—General
8.2—Sign convention
8.3—Post-tensioning effects
18 8.4—Effective compressive stress fpc
19 8.5—Extension of punching shear design procedure to post-tensioned flat plates
20 8.6—Research on post-tensioned flat plates
CHAPTER 9—REFERENCES
21 Authored documents
23 APPENDIX A—VERIFICATION OF PROPOSED MINIMUM AMOUNT OF SHEAR REINFORCEMENT FOR EARTHQUAKE-RESISTANT FLAT PLATE-COLUMN CONNECTIONS
24 APPENDIX B—VERIFICATION OF REDUCED Msc VALUE PERMITTED IN PUNCHING SHEAR DESIGN
27 APPENDIX C—NOTES ON PROPERTIES OF SHEAR CRITICAL SECTION
C.1—Equations for Jx and Jy
C.2—Equations for γv
28 APPENDIX D—DESIGN EXAMPLES
D.1—General
D.2—Example 1: Interior flat plate-column connection
29 D.3—Example 2: Edge flat plate-column connection
30 D.4—Example 3: Corner flat plate-column connection
31 D.5—Example 4: Use of stirrups—interior flat plate-column connection
32 D.6—Example 5: Interior flat plate-column connection of Example 1, repeated using SI units
33 D.7—Post-tensioned flat plate structure
34 D.8—Example 6: Post-tensioned flat plate connection with interior column
35 D.9—Example 7: Post-tensioned flat plate connection with edge column

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