ACI CODE-349-23: Nuclear Safety-Related Concrete Structures—Code Requirements and Commentary

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Description

This Code covers the design and construction of concrete structures that form part of a nuclear facility and that have nuclear safety-related functions but does not cover concrete reactor vessels and concrete containment structures, as defined by ASME BPVC Section III Division 2:2019, or steel-plate composite walls and steel-plate composite slabs, as defined by ANSI/AISC N690.

The structures covered by this Code include concrete structures inside and outside the containment system.

This Code may be referenced and applied subject to agreement between the owner and the Regulatory Authority.

The format of this Code is such that it depends on the “Building Code Requirements for Structural Concrete (ACI CODE-318-14)” and should be used in conjunction with that Code. Unless otherwise stated, all instances of ACI 318 are referring to ACI CODE-318-14. When searching for subsections, tables, and figures in this Code, first refer to the main section of this Code to see if it is included and to find potential exceptions to the corresponding subsection, table or figure in ACI-318.

The Commentary, which is presented after the Code, discusses some of the considerations of ACI Committee 349 in developing “Code Requirements for Nuclear Safety-Related Concrete Structures (ACI 349).” This information is provided in the Commentary because the Code is written as a legal document and therefore cannot present background details or suggestions for carrying out its requirements

 

Document Details

Author: ACI Committee 349

Publication Year: 2024

Pages: 273

ISBN: 9781641952644

Formats: Printed Document or Protected PDF/Web View

Table of Contents

CHAPTER 1—GENERAL, p. 5

1.1—Scope, p. 5

1.2—General, p. 5

1.3—Purpose, p. 6

1.4—Applicability, p. 6

1.5—Interpretation, p. 7

1.6—Authority having jurisdiction, p. 7

1.7—Licensed design professional, p. 7

1.8—Construction documents and design records, p. 7

1.10—Approval of special systems of design, construction, or alternative construction materials, p. 8

CHAPTER 2—NOTATION AND TERMINOLOGY, p. 9

2.1—Scope, p. 9

2.2—Notation, p. 9

2.3—Terminology, p. 22

CHAPTER 3—REFERENCED STANDARDS, p. 37

3.1—Scope, p. 37

3.2—Referenced standards, p. 37

CHAPTER 4—STRUCTURAL SYSTEM REQUIREMENTS, p. 40

4.1—Scope, p. 40

4.2—Materials, p. 40

4.3—Design loads, p. 40

4.4—Structural system and load paths, p. 40

4.5—Structural analysis, p. 42

4.6—Strength, p. 42

4.7—Serviceability, p. 43

4.8—Durability, p. 43

4.9—Sustainability, p. 43

4.10—Structural integrity, p. 43

4.11—Fire resistance, p. 43

4.12—Requirements for specific types of construction, p. 43

4.13—Construction and inspection, p. 44

4.14—Strength evaluation of existing structures, p. 44

Chapter 5—LOADS, p. 45

5.1—Scope, p. 45

5.2—General, p. 45

5.3—Load factors and combinations, p. 47

Chapter 6—STRUCTURAL ANALYSIS, p. 52

6.1—Scope, p. 52

6.2—General, p. 52

6.3—Modeling assumptions, p. 52

6.4—Arrangement of live load, p. 52

6.5—Simplified method of analysis for nonprestressed continuous beams and one-way slabs, p. 52

6.6—First-order analysis, p. 52

6.7—Elastic second-order analysis, p. 52

6.8—Intentionally left blank, p. 53

6.9—Acceptability of finite element analysis, p. 53

CHAPTER 7—ONE-WAY SLABS, p. 54

7.1—Scope, p. 54

7.2—General, p. 54

7.3—Design limits, p. 54

7.4—Required strength, p. 54

7.5—Design strength, p. 54

7.6—Reinforcement limits, p. 55

7.7—Reinforcement detailing, p. 55

CHAPTER 8—TWO-WAY SLABS, p. 56

8.1—Scope, p. 56

8.2—General, p. 56

8.3—Design limits, p. 56

8.4—Required strength, p. 58

8.5—Design strength, p. 58

8.6—Reinforcement limits, p. 58

8.7—Reinforcement detailing, p. 59

8.8—Nonprestressed two-way joist systems, p. 59

8.9—Lift-slab construction, p. 59

8.10—Direct design method, p. 59

8.11—Equivalent frame method, p. 59

CHAPTER 9—BEAMS, p. 60

9.1—Scope, p. 60

9.2—General, p. 60

9.3—Design limits, p. 60

9.4—Required strength, p. 60

9.5—Design strength, p. 60

9.6—Reinforcement limits, p. 61

9.7—Reinforcement detailing, p. 61

9.8—Nonprestressed one-way joist systems, p. 61

9.9—Deep beams, p. 61

CHAPTER 10—COLUMNS, p. 62

10.1—Scope, p. 62

10.2—General, p. 62

10.3—Design limits, p. 62

10.4—Required strength, p. 62

10.5—Design strength, p. 62

10.6—Reinforcement limits, p. 63

10.7—Reinforcement detailing, p. 63

CHAPTER 11—WALLS, p. 64

11.1—Scope, p. 64

11.2—General, p. 64

11.3—Design limits, p. 64

11.4—Required strength, p. 64

11.5—Design strength, p. 64

11.6—Reinforcement limits, p. 65

11.7—Reinforcement detailing, p. 65

11.8—Alternative method for out-of-plane slender wall analysis, p. 65

CHAPTER 12—DIAPHRAGMS, p. 66

12.1—Scope, p. 66

12.2—General, p. 66

12.3—Design limits, p. 67

12.4—Required strength, p. 67

12.5—Design strength, p. 68

12.6—Reinforcement limits, p. 70

12.7—Reinforcement detailing, p. 70

CHAPTER 13—FOUNDATIONS, p. 72

13.1—Scope, p. 72

13.2—General, p. 72

13.3—Shallow foundations, p. 73

13.4—Deep foundations, p. 73

CHAPTER 14—INTENTIONALLY LEFT BLANK, p. 75

CHAPTER 15—BEAM-COLUMN AND SLAB-COLUMN JOINTS, p. 76

15.1—Scope, p. 76

15.2—General, p. 76

15.3—Transfer of column axial force through the floor system, p. 76

15.4—Detailing of joints, p. 76

CHAPTER 16—CONNECTIONS BETWEEN MEMBERS, p. 77

16.1—Scope, p. 77

16.2—Connections of precast members, p. 77

16.3—Connections to foundations, p. 77

16.4—Horizontal shear transfer in composite concrete flexural members, p. 77

16.5—Brackets and corbels, p. 77

CHAPTER 17—ANCHORING TO CONCRETE, p. 79

17.1—Scope, p. 79

17.2—General, p. 86

17.3—Design limits, p. 90

17.4—Required strength, p. 91

17.5—General requirements for strength of anchors, p. 91

17.7—Design requirements for shear loading, p. 110

17.8—Tension and shear interaction, p. 119

17.9—Required edge distances, spacings, and thicknesses to preclude splitting failure, p. 120

17.10—Attachments with shear lugs, p. 122

CHAPTER 18—PROVISIONS FOR EARTHQUAKE-RESISTANT DESIGN, p. 129

18.1—Scope, p. 129

18.2—General, p. 129

18.3—Intentionally left blank, p. 132

18.4—Intentionally left blank, p. 132

18.5—Intentionally left blank, p. 132

18.6—Beams, p. 133

18.7—Columns, p. 139

18.8—Joints of moment frame, p. 144

18.9—Intentionally left blank, p. 148

18.10—Structural walls, p. 148

18.11—Intentionally left blank, p. 159

18.12—Diaphragms, p. 159

18.13—Foundations, p. 164

18.14—Intentionally left blank, p. 166

CHAPTER 19—CONCRETE DESIGN AND DURABILITY, p. 167

19.1—Scope, p. 167

19.2—Concrete design properties, p. 167

19.3—Concrete durability requirements, p. 168

19.4—Grout durability requirements, p. 170

CHAPTER 20—STEEL REINFORCEMENT PROPERTIES, DURABILITY, AND EMBEDMENTS, p. 171

20.1—Scope, p. 171

20.2—Nonprestressed bars and wires, p. 171

20.3—Prestressing strands, wires, and bars, p. 174

20.4—Structural steel, pipe, and tubing for composite columns, p. 174

20.5—Headed shear stud reinforcement, p. 174

20.6—Provisions for durability of steel reinforcement, p. 174

20.7—Embedments, p. 175

CHAPTER 21—STRENGTH REDUCTION FACTORS, p. 176

21.1—Scope, p. 176

21.2—Strength reduction factors for structural concrete members and connections, p. 176

CHAPTER 22—SECTIONAL STRENGTH, p. 178

22.1—Scope, p. 178

22.2—Design assumptions for moment and axial strength, p. 178

22.3—Flexural strength, p. 178

22.4—Axial strength or combined flexural and axial strength, p. 178

22.5—One-way shear strength, p. 178

22.6—Two-way shear strength, p. 178

22.7—Torsional strength, p. 179

22.8—Bearing, p. 179

22.9—Shear-friction, p. 180

CHAPTER 23—STRUT-AND-TIE MODELS, p. 181

23.1—Scope, p. 181

23.2—General, p. 181

23.3—Design strength, p. 181

23.4—Strength of struts, p. 181

23.5—Reinforcement crossing bottle-shaped struts, p. 181

23.6—Strut reinforcement detailing, p. 181

23.7—Strength of ties, p. 181

23.8—Tie reinforcement detailing, p. 181

23.9—Strength of nodal zones, p. 181

CHAPTER 24—SERVICEABILITY REQUIREMENTS, p. 182

24.1—Scope, p. 182

24.2—Control of deflections, p. 182

24.3—Distribution of flexural reinforcement in one-way slabs and beams, p. 184

24.4—Minimum reinforcement, p. 185

24.5—Permissible stresses in prestressed concrete flexural members, p. 186

24.6—Walls, p. 186

CHAPTER 25—REINFORCEMENT DETAILS, p. 187

25.1—Scope, p. 187

25.2—Minimum spacing of reinforcement, p. 187

25.3—Standard hooks, seismic hooks, crossties, and minimum inside bend diameters, p. 187

25.4—Development of reinforcement, p. 187

25.5—Splices, p. 199

25.6—Bundled reinforcement, p. 201

25.7—Transverse reinforcement, p. 201

25.8—Post-tensioning anchorages and couplers, p. 201

25.9—Anchorage zones for post-tensioned tendons, p. 201

CHAPTER 26—CONSTRUCTION DOCUMENTS AND INSPECTION, p. 204

26.1—Scope, p. 204

26.2—Design criteria, p. 205

26.3—Member information, p. 205

26.4—Concrete materials and mixture requirements, p. 205

26.5—Concrete production and construction, p. 208

26.6—Reinforcement materials and construction requirements, p. 210

26.7—Anchoring to concrete, p. 211

26.8—Embedments, p. 212

26.9—Additional requirements for precast concrete, p. 213

26.10—Additional requirements for prestressed concrete, p. 214

26.11—Formwork, p. 214

26.12—Concrete evaluation and acceptance, p. 214

26.13—Inspection, p. 215

CHAPTER 27—STRENGTH AND EVALUATION OF EXISTING STRUCTURES, p. 218

27.1—Scope, p. 218

27.2—General, p. 218

27.3—Analytical strength evaluation, p. 218

27.4—Strength evaluation by load test, p. 219

27.5—Reduced load rating, p. 221

APPENDIX A—SHELLS, p. 222

A.1—Scope and definitions, p. 222

A.2—General, p. 222

A.3—Design strength of materials, p. 223

A.4—Section design and reinforcement requirements, p. 224

A.5—Construction, p. 224

APPENDIX B—INTENTIONALLY LEFT BLANK, p. 225

APPENDIX C—ALTERNATIVE LOAD AND STRENGTH-REDUCTION FACTORS, p. 226

C.1—Scope, p. 226

C.2—Required strength, p. 226

C.3—Design strength, p. 228

APPENDIX D—INTENTIONALLY LEFT BLANK, p. 231

APPENDIX E—THERMAL CONSIDERATIONS, p. 232

E.1—Scope, p. 232

E.2—General design requirements, p. 233

E.3—Concrete temperatures, p. 234

APPENDIX F—SPECIAL PROVISIONS FOR IMPULSIVE AND IMPACTIVE EFFECTS, p. 237

F.1—Scope, p. 237

F.2—Dynamic strength increase, p. 238

F.3—Deformation, p. 240

F.4—Requirements to assure ductility, p. 245

F.5—Shear strength, p. 247

F.6—Impulsive effects, p. 249

F.7—Impactive effects, p. 252

F.8—Impactive and impulsive loads, p. 262

F.9—Splices, p. 263

Authored documents, p. 267

Summary of Changes in the Code, p. 272

ERRATA INFO

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