ACI CODE-318-25: Building Code for Structural Concrete- Code Requirements and Commentary (ACI CODE-318-25)

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Description

The “Building Code for Structural Concrete” (“Code”) provides minimum requirements for the materials, design, and detailing of structural concrete buildings and, where applicable, nonbuilding structures. The Code was developed using a consensus process and addresses structural systems, members, and connections, including cast-in-place, precast, shotcrete, plain, nonprestressed, and prestressed, construction. Among the subjects covered are: design and construction for strength, serviceability, and durability; load combinations, load factors, and strength reduction factors; structural analysis methods; deflection limits; mechanical and adhesive anchoring to concrete; development and splicing of reinforcement; construction document information; field inspection and testing; methods to evaluate the strength of existing structures; design verification using nonlinear response history analysis in Appendix A; performance-based wind design in Appendix B, and sustainability and resilience in Appendix C.

Uses of the Code include adoption by reference in a general building code, and earlier editions have been widely used in this manner. The Code is written in a format that allows such reference without change to its language. Commentary is provided for background information and further explanation of the code requirements. Cited references provide research data useful in studying technical issues in greater detail. Other references, provide greater insight into the code the requirements. Technical changes from ACI CODE-318-19 to ACI CODE-318-25 are indicated by change bars in the margins of the print and PDF versions. Technical changes from ACI CODE-318-19 to ACI CODE-318-25 may also be viewed in red highlights within the PLUS version (https://www.concrete.org/publications/aci318plus.aspx).

Special thanks to Bentley Systems, Incorporated, for use of their ProConcrete software to produce many of the figures found in the Commentary.

Keywords:

admixtures; aggregates; anchorage (structural); beam-column frame; beams (supports); caissons; cements; cold weather; columns (supports); combined stress; composite construction (concrete to concrete); compressive strength; concrete; construction documents; construction joints; continuity (structural); contraction joints; cover; curing; deep beams; deep foundations; deflections; drilled piers; earthquake-resistant structures; flexural strength; floors; footings; formwork (construction); hot weather; inspection; isolation joints; joints (junctions); joists; lightweight concretes; load tests (structural); loads (forces); mixture proportioning; modulus of elasticity; moments; piles; placing; plain concrete; precast concrete; prestressed concrete; prestressing steels; quality control; reinforced concrete; reinforcing steels; resilience; roofs; serviceability; shear strength; shotcrete; spans; splicing; strength analysis; stresses; structural analysis; structural design; structural integrity; structural walls; sustainability; T-beams; torsion; walls; water; welded wire reinforcement.

 

Document Details

Author: ACI Committee 318

Publication Year: 2025

Pages: 702

ISBN: 9781641953092

Categories: Codes

Formats: Protected PDF/Web View

Table of Contents

Part 1: General

Chapter 1: General

1.1—Scope of ACI CODE-318, p. 9

1.2—General, p. 9

1.3—Purpose, p. 10

1.4—Applicability, p. 10

1.5—Interpretation, p. 12

1.6—Building official, p. 13

1.7—Licensed design professional, p. 13

1.8—Construction documents and design records, p. 13

Chapter 2:Notation and Terminology

2.1—Scope, p. 15

2.2—Notation, p. 15

2.3—Terminology, p. 33

Chapter 3: Referenced Standards

3.1—Scope, p. 55

3.2—Referenced standards, p. 55

Chapter 4: Structural System Requirements

4.1—Scope, p. 59

4.2—Materials, p. 59

4.3—Design loads, p. 59

4.4—Structural system and load paths, p. 59

4.5—Structural analysis, p. 62

4.6—Strength, p. 62

4.7—Serviceability, p. 64

4.8—Durability, p. 64

4.9—Sustainability and resilience, p. 64

4.10—Structural integrity, p. 64

4.11—Fire resistance, p. 65

4.12—Requirements for specific types of construction, p. 65

4.13—Construction and inspection, p. 68

4.14—Strength evaluation of existing structures, p. 68

Part 2: Loads & Analysis

Chapter 5: Loads

5.1—Scope, p. 69

5.2—General, p. 69

5.3—Load factors and combinations, p. 69

Chapter 6: Structural Analysis

6.1—Scope, p. 75

6.2—General, p. 75

6.3—Modeling assumptions, p. 81

6.4—Arrangement of live load, p. 82

6.5—Simplified method of analysis for nonprestressed continuous beams and one-way slabs, p. 83

6.6—Linear elastic first-order analysis, p. 84

6.7—Linear elastic second-order analysis, p. 95

6.8—Inelastic analysis, p. 96

6.9—Acceptability of finite element analysis, p. 97

Part 3: Members

Chapter 7: One-Way Slabs

7.1—Scope, p. 99

7.2—General, p. 99

7.3—Design limits, p. 99

7.4—Required strength, p. 101

7.5—Design strength, p. 101

7.6—Reinforcement limits, p. 102

7.7—Reinforcement detailing, p. 105

Chapter 8: Two-Way Slabs

8.1—Scope, p. 111

8.2—General, p. 111

8.3—Design limits, p. 112

8.4—Required strength, p. 114

8.5—Design strength, p. 120

8.6—Reinforcement limits, p. 121

8.7—Reinforcement detailing, p. 124

8.8—Nonprestressed two-way joist systems, p. 138

8.9—Lift-slab construction, p. 139

Chapter 9: Beams

9.1—Scope, p. 141

9.2—General, p. 141

9.3—Design limits, p. 142

9.4—Required strength, p. 144

9.5—Design strength, p. 147

9.6—Reinforcement limits, p. 149

9.7—Reinforcement detailing, p. 152

9.8—Nonprestressed one-way joist systems, p. 163

9.9—Deep beams, p. 164

Chapter 10: Columns

10.1—Scope, p. 169

10.2—General, p. 169

10.3—Design limits, p. 169

10.4—Required strength, p. 170

10.5—Design strength, p. 171

10.6—Reinforcement limits, p. 171

10.7—Reinforcement detailing, p. 172

Chapter 11: Walls

11.1—Scope, p. 179

11.2—General, p. 179

11.3—Design limits, p. 180

11.4—Required strength, p. 180

11.5—Design strength, p. 182

11.6—Reinforcement limits, p. 184

11.7—Reinforcement detailing, p. 185

11.8—Alternative method for out-of-plane slender wall analysis, p. 186

Chapter 12: Diaphragms

12.1—Scope, p. 189

12.2—General, p. 190

12.3—Design limits, p. 192

12.4—Required strength, p. 192

12.5—Design strength, p. 195

12.6—Reinforcement limits, p. 202

12.7—Reinforcement detailing, p. 202

Chapter 13: Foundations

13.1—Scope, p. 205

13.2—General, p. 207

13.3—Shallow foundations, p. 211

13.4—Deep foundations, p. 214

Part 4: Joints/Connections/Anchors

Chapter 14: Plain Concrete

14.1—Scope, p. 221

14.2—General, p. 222

14.3—Design limits, p. 222

14.4—Required strength, p. 224

14.5—Design strength, p. 225

14.6—Reinforcement detailing, p. 227

Chapter 15: Cast-in-Place Joints

15.1—Scope, p. 229

15.2—General, p. 229

15.3—Design limits, p. 229

15.4—Required strength, p. 230

15.5—Design strength, p. 230

15.6—Reinforcement limits, p. 233

15.7—Reinforcement detailing, p. 233

15.8—Transfer of column axial force through the floor system, p. 234

Chapter 16: Connections Between Members

16.1—Scope, p. 235

16.2—Connections of precast members, p. 235

16.3—Connections to foundations, p. 240

16.4—Horizontal shear transfer in composite concrete flexural members, p. 243

16.5—Brackets and corbels, p. 246

Chapter 17: Anchoring to Concrete

17.1—Scope, p. 253

17.2—General, p. 254

17.3—Design Limits, p. 255

17.4—Required strength, p. 257

17.5—Design strength, p. 257

17.6—Tensile strength, p. 266

17.7—Shear strength, p. 282

17.8—Tension and shear interaction, p. 292

17.9—Edge distances, spacings, and thicknesses to preclude splitting failure, p. 293

17.10—Earthquake-resistant anchor design requirements, p. 295

17.11—Attachments with shear lugs, p. 300

Part 5: Earthquake Resistance

Chapter 18: Earthquake-Resistant Structures

18.1—Scope, p. 307

18.2—General, p. 308

18.3—Ordinary moment frames, p. 315

18.4—Intermediate moment frames, p. 316

18.5—Intermediate precast structural walls, p. 325

18.6—Beams of special moment frames, p. 325

18.7—Columns of special moment frames, p. 334

18.8—Joints of special moment frames, p. 340

18.9—Special moment frames constructed using precast concrete18.9.1, p. 344

18.10—Special structural walls, p. 346

18.11—Special structural walls constructed using precast concrete, p. 374

18.12—Diaphragms and trusses, p. 374

18.13—Foundations, p. 382

18.14—Members not designated as part of the seismic-force-resisting system, p. 390

Part 6: Materials & Durability

Chapter 19: Concrete: Design and Durability Requirements

19.1—Scope, p. 395

19.2—Concrete design properties, p. 395

19.3—Concrete durability requirements, p. 398

19.4—Grout durability requirements, p. 410

Chapter 20: Steel Reinforcement Properties, Durability, and Embedments

20.1—Scope, p. 409

20.2—Nonprestressed bars and wires, p. 409

20.3—Prestressing strands, wires, and bars, p. 415

20.4—Headed shear stud reinforcement, p. 419

20.6—Embedments, p. 427

Part 7: Strength & Serviceability

Chapter 21: Strength Reduction Factors

21.1—Scope, p. 429

21.2—Strength reduction factors for structural concrete members and connections, p. 429

Chapter 22: Sectional Strength

22.1—Scope, p. 437

22.2—Design assumptions for moment and axial strength, p. 437

22.3—Flexural strength, p. 439

22.4—Axial strength or combined flexural and axial strength, p. 440

22.5—One-way shear strength, p. 441

22.7—Torsional strength, p. 459

22.8—Bearing, p. 468

22.9—Shear friction, p. 470

Chapter 23: Strut-and-Tie Method

23.1—Scope, p. 477

23.2—General, p. 479

23.3—Design strength, p. 484

23.4—Strength of struts, p. 484

23.5—Minimum distributed reinforcement, p. 486

23.7—Strength of ties, p. 489

23.8—Tie reinforcement detailing, p. 490

23.9—Strength of nodal zones, p. 491

23.10—Curved-bar nodes, p. 492

23.11—Earthquake-resistant design using the strut-and-tie method, p. 494

Chapter 24: Serviceability

24.1—Scope, p. 497

24.2—Deflections due to service-level gravity loads, p. 497

24.3—Distribution of flexural reinforcement in one-way slabs and beams, p. 502

24.4—Shrinkage and temperature reinforcement, p. 504

24.5—Permissible stresses in prestressed concrete flexural members, p. 506

Part 8: Reinforcement

Chapter 25: Reinforcement Details

25.1—Scope, p. 509

25.2—Minimum spacing of reinforcement, p. 509

25.3—Standard hooks, seismic hooks, crossties, and minimum inside bend diameters, p. 511

25.5—Splices, p. 534

25.6—Bundled reinforcement, p. 542

25.7—Transverse reinforcement, p. 544

25.8—Post-tensioning anchorages and couplers, p. 556

25.9—Anchorage zones for post-tensioned tendons, p. 557

Part 9: Construction

Chapter 26: Construction Documents and Inspection

26.1—Scope, p. 567

26.2—Design criteria, p. 568

26.3—Member information, p. 568

26.4—Concrete materials, mixture requirements, and grouts, p. 568

26.5—Concrete production and construction, p. 578

26.6—Reinforcement materials and construction requirements, p. 587

26.7—Anchoring to concrete, p. 592

26.8—Embedments, p. 595

26.9—Additional requirements for precast concrete, p. 595

26.10—Additional requirements for post-tensioned concrete, p. 597

26.11—Formwork, p. 599

26.12—Evaluation and acceptance of hardened concrete, p. 601

26.13—Inspection, p. 607

Part 10: Evaluation

Chapter 27: Strength Evaluation of Existing Structures

27.1—Scope, p. 613

27.2—General, p. 613

27.3—Analytical strength evaluation, p. 614

27.4—Strength evaluation by load test, p. 615

Appendices & References

Appendix A: Design Verification Using Nonlinear Response History Analysis

A.1—Notation and terminology, p. 621

A.2—Scope, p. 621

A.3—General, p. 622

A.4—Earthquake ground motions, p. 622

A.5—Load factors and combinations, p. 623

A.6—Modeling and analysis, p. 623

A.7—Action classification and criticality, p. 624

A.8—Effective stiffness, p. 625

A.9—Expected material strength, p. 627

A.10—Acceptance criteria for deformation-controlled actions, p. 628

A.11—Expected strength for force-controlled actions, p. 629

A.12—Enhanced detailing requirements, p. 631

A.13—Independent structural design review, p. 632

Appendix B: Performance-based Wind Design

B.1—Notation and Terminology, p. 635

B.2—Scope, p. 636

B.3—General, p. 636

B.4—Wind loading, p. 638

B.5—Load factors and combinations, p. 639

B.6—Modeling and analysis, p. 640

B.7—Action classification and requirements, p. 642

B.8—Effective stiffness, p. 642

B.9—Expected material strength, p. 644

B.10—Required strength and acceptance criteria for continuous occupancy, limited interruption performance objective—general, p. 644

B.11—Required strength and acceptance criteria for continuous occupancy, limited interruption performance objective by Method 1, p. 645

B.12—Required strength and acceptance criteria for continuous occupancy, limited interruption performance objective by Methods 2 and 3, p. 647

B.13—Detailing requirements, p. 648

B.14—Independent structural design review, p. 652

Appendix C: Sustainability and Resilience

C.1—Terminology, p. 655

C.2—Scope, p. 656

C.3—Evaluation of Sustainability of Structural Concrete Systems, p. 656

C.4—Resilience, p. 658

C.5—Concrete Mixtures, p. 660

Appendix D: STEEL REINFORCEMENT INFORMATION, p. 663

Appendix E: Equivalence Between SI-Metric, MKS-Metric, and U.S. Customary Units of Nonhomogeneous Equations in the Code

Commentary References

INDEX

ERRATA INFO

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