This code provides retrofit and rehabilitation criteria for reinforced concrete buildings based on results from the most recent research on the seismic performance of existing concrete buildings. The intent of this code is to provide provisions related to concrete material and concrete members, including material testing criteria, modeling parameters, and acceptance criteria for use within the ASCE 41 framework, similar to how the National Earthquake Hazards Reduction Program (NEHRP) Recommended Seismic Provisions produced by the Federal Emergency Management Agency (FEMA) (FEMA 450) have served as source documents for the International Building Code (IBC) and its predecessor building codes. Starting in the 2023 edition, ASCE 41 references ACI 369.1 directly for concrete-related provisions. Chapter and section numbers of ASCE 41 cited in ACI 369.1 correspond to ASCE 41-17 unless otherwise noted. This code should be used in conjunction with Chapters 1 through 8 of ASCE 41-17 and applicable sections of the ACI 318-19 Building Code. Chapter 1 of ASCE 41 provides general requirements for evaluation and retrofit, including the selection of performance objectives and retrofit strategies. Chapter 2 of ASCE 41 defines performance objectives and seismic hazards. Chapter 3 of ASCE 41 provides requirements for evaluation and retrofit, including treating as-built information and selecting appropriate screening procedures. Chapter 4 of ASCE 41 summarizes Tier 1 screening procedures, while Chapters 5 and 6 summarize Tier 2 deficiency-based procedures and Tier 3 systematic procedures for evaluation and retrofit, respectively. Chapter 7 of ASCE 41 details analysis procedures referenced in ACI 369.1, including linear and nonlinear analysis procedures, acceptance criteria, and alternative methods for determining modeling parameters and acceptance criteria. Chapter 8 of ASCE 41 provides geotechnical engineering provisions for building foundations and assessment of seismic-geologic site hazards. References to these chapters can be found throughout the standard. The design professional is referred to FEMA 547 for detailed information on seismic rehabilitation measures for concrete buildings. Repair techniques for earthquake-damaged concrete components are not included in ACI 369.1. The licensed design professional is referred to ACI 562, FEMA 306, FEMA 307, and FEMA 308 for information on evaluation and repair of damaged concrete wall components. This code does not provide modeling procedures, acceptance criteria, or rehabilitation measures for concrete-encased steel composite components. Keywords: acceptance criteria; building; deformation-controlled; dynamic analysis; earthquake; force-controlled; modeling parameters; nonlinear analysis; retrofit; seismic evaluation, seismic assessment; structural evaluation.

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PDF Pages	PDF Title
3	TITLE PAGE
4	INTRODUCTION
7	CHAPTER 1—GENERAL 1.1—Scope CHAPTER R1—GENERAL R1.1—Scope
8	CHAPTER R2—MATERIAL PROPERTIES AND CONDITION ASSESSMENT R2.1—General CHAPTER 2—MATERIAL PROPERTIES AND CONDITION ASSESSMENT 2.1—General
9	2.2—Properties of in-place materials and components R2.2—Properties of in-place materials and components
17	2.3—Condition assessment R2.3—Condition assessment
19	2.4—Knowledge factor R2.5—Properties of new materials
20	2.5—Properties of new materials
21	CHAPTER 3—GENERAL ASSUMPTIONS AND REQUIREMENTS 3.1—Modeling and design CHAPTER R3—GENERAL ASSUMPTIONS AND REQUIREMENTS R3.1—Modeling and design
31	3.2—Strength and deformability R3.2—Strength and deformability
32	3.3—Flexure and axial loads R3.3—Flexure and axial loads
35	3.4—Shear and torsion R3.4—Shear and torsion R3.5—Development and splices of reinforcement
36	3.5—Development and splices of reinforcement
38	3.6—Connections to existing concrete R3.6—Connections to existing concrete
41	3.7—Retrofit measures
42	CHAPTER R4—CONCRETE MOMENT FRAMES CHAPTER 4—CONCRETE MOMENT FRAMES 4.1—Types of concrete moment frames
43	R4.2—Reinforced concrete beam-column moment frames 4.2—Reinforced concrete beam-column moment frames
61	R4.3—Post-tensioned concrete beam-column moment frames 4.3—Post-tensioned concrete beam-column moment frames
62	4.4—Slab-column moment frames 4.4—Slab-column moment frames
69	CHAPTER 5—PRECAST CONCRETE FRAMES 5.1—Types of precast concrete frames 5.2—Precast concrete frames expected to resist seismic forces CHAPTER R5—PRECAST CONCRETE FRAMES R5.1—Types of precast concrete frames R5.2—Precast concrete frames expected to resist seismic forces
70	5.3—Precast concrete frames not expected to resist seismic forces directly R5.3—Precast concrete frames not expected to resist seismic forces directly
72	CHAPTER R6—CONCRETE FRAMES WITH INFILLS R6.1—Types of concrete frames with infills R6.2—Concrete frames with masonry infills CHAPTER 6—CONCRETE FRAMES WITH INFILLS 6.1—Types of concrete frames with infills 6.2—Concrete frames with masonry infills
76	R6.3—Concrete frames with concrete infills 6.3—Concrete frames with concrete infills
79	CHAPTER 7—CONCRETE STRUCTURAL WALLS 7.1—Types of concrete structural walls and associated components CHAPTER R7—CONCRETE STRUCTURAL WALLS R7.1—Types of concrete structural walls and associated components
81	R7.2—Strength of reinforced concrete structural walls, wall segments, and coupling beams 7.2—Strength of reinforced concrete structural walls, wall segments, and coupling beams
83	R7.3—Linear static and dynamic procedures for reinforced concrete structural walls and wall segments 7.3—Linear static and dynamic procedures for reinforced concrete structural walls and wall segments
89	R7.4—Nonlinear static and dynamic procedures for reinforced concrete structural walls and wall segments 7.4—Nonlinear static and dynamic procedures for reinforced concrete structural walls and wall segments
95	R7.5—Linear static and dynamic procedures for reinforced concrete coupling beams 7.5—Linear static and dynamic procedures for reinforced concrete coupling beams
97	7.6—Nonlinear static and dynamic procedures for reinforced concrete coupling beams
99	7.7—Retrofit measures for reinforced concrete structural walls, wall segments, and coupling beams R7.7—Retrofit measures for reinforced concrete structural walls, wall segments, and coupling beams
101	CHAPTER 8—PRECAST CONCRETE STRUCTURAL WALLS 8.1—Types of precast structural walls CHAPTER R8—PRECAST CONCRETE STRUCTURAL WALLS R8.1—Types of precast structural walls
102	8.2—Precast concrete structural walls and wall segments R8.2—Precast concrete structural walls and wall segments
107	CHAPTER 9—CONCRETE-BRACED FRAMES 9.1—Types of concrete-braced frames 9.2—General 9.3—Stiffness of concrete-braced frames CHAPTER R9—CONCRETE-BRACED FRAMES
108	9.4—Strength of concrete-braced frames 9.5—Acceptance criteria for concrete-braced frames
109	9.6—Retrofit measures for concrete-braced frames R9.6—Retrofit measures for concrete-braced frames
110	CHAPTER 10—CAST-IN-PLACE CONCRETE DIAPHRAGMS R10.1—Components of cast-in-place concrete diaphragms R10.2—Analysis, modeling, and acceptance criteria for cast-in-place concrete diaphragms CHAPTER 10—CAST-IN-PLACE CONCRETE DIAPHRAGMS 10.1—Components of cast-in-place concrete diaphragms 10.2—Analysis, modeling, and acceptance criteria for cast-in-place concrete diaphragms
111	R10.3—Retrofit measures for cast-in-place concrete diaphragms 10.3—Retrofit measures for cast-in-place concrete diaphragms
112	CHAPTER R11—PRECAST CONCRETE DIAPHRAGMS R11.1—Components of precast concrete diaphragms R11.2—Analysis, modeling, and acceptance criteria for precast concrete diaphragms R11.3—Retrofit measures for precast concrete diaphragms CHAPTER 11—PRECAST CONCRETE DIAPHRAGMS 11.1—Components of precast concrete diaphragms 11.2—Analysis, modeling, and acceptance criteria for precast concrete diaphragms 11.3—Retrofit measures for precast concrete diaphragms
113	CHAPTER 12—CONCRETE FOUNDATIONS 12.1—Types of concrete foundations CHAPTER R12—CONCRETE FOUNDATIONS R12.1—Types of concrete foundations
114	12.2—Analysis of existing concrete foundations 12.3—Evaluation of existing condition 12.4—Retrofit measures for concrete foundations R12.2—Analysis of existing concrete foundations R12.4—Retrofit measures for concrete foundations
117	CHAPTER 13—NOTATION AND DEFINITIONS 13.1—Notation
121	13.2—Definitions
123	CHAPTER 14—REFERENCES
124	Authored references

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Standard Title	ACI CODE-369.1-22: Seismic Evaluation and Retrofit of Existing Concrete Buildings—Code and Commentary – SI Edition
Published Code	ACI
Publication Date	2022

ACI 369.1 2022 SI

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