ACI 369.1-2017 Standard Requirements for Seismic Evaluation and Retrofit of Existing Concrete Buildings (ACI 369.1-17) and Commentary.pdf

1、ACI 369.1-17 An ACI Standard Standard Requirements for Seismic Evaluation and Retrofit of Existing Concrete Buildings (ACI 369.1-17) and Commentary Reported by ACI Committee 369First Printing October 2017 ISBN: 978-1-945487-78-1 Standard Requirements for Seismic Evaluation and Retrofit of Existing C

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14、ll not be made in contract documents. If items found in this document are desired by the Architect/Engineer to be a part of the contract documents, they shall be restated in mandatory language for incorporation by the Architect/Engineer. ACI 369.1-17 Standard Requirements for Seismic Evaluation and

15、Retrofit of Existing Concrete Buildings (ACI 369.1-17) and Commentary An ACI Standard Reported by Committee 369 Wassim M. Ghannoum, Chair Siamak Sattar, Secretary Anna C. Birely Sergio F. Brena Casey Champion Jeffrey J. Dragovich Kenneth J. Elwood Una M. Gilmartin Arne Halterman Wael Mohammed Hassan

16、 Mohammad Iqbal Jose M. Izquierdo-Encarnacion Afshar Jalalian Thomas Kang Dominic J. Kelly Insung Kim Laura N. Lowes Kenneth A. Luttrell Adolfo B. Matamoros Steven L. McCabe Murat Melek Jack P. Moehle Arif M. Ozkan Robert G. Pekelnicky Jose A. Pincheira Mario E. Rodriguez Murat Saatcioglu Siamak Sat

17、tar Halil Sezen Roberto Stark Andreas Stavridis John W. Wallace Tom C. Xia Consulting Members Sergio M. Alcocer David Bonowitz Charles J. Hookham Shyh-Jiann Hwang Regan Milam Andrew D. Mitchell Raj Valluvan PREFACE This standard provides retrofit and rehabilitation criteria for reinforced concrete b

18、uildings based on results from the most recent research on the seismic performance of existing concrete buildings. The intent of this standard is to provide a continuously updated resource document for modifications to Chapter 10 of ASCE 41-17, similar to how the National Earthquake Hazards Reductio

19、n Program (NEHRP) Recom- mended 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 prede - cessor building codes. Specifically, this version of ACI 369.1 serves as the basis for Ch

20、apter 10, “Concrete,” of ASCE 41-17. This standard should be used in conjunction with Chapters 1 through 7 of ASCE 41-17. Chapter 1 of ASCE 41-17 provides general requirements for evaluation and retrofit, including the selec- tion of performance objectives and retrofit strategies. Chapter 2 of ASCE

21、41-17 defines performance objectives and seismic hazards. Chapter 3 of ASCE 41-17 provides the requirements for evaluation and retrofit, including treating as-built information and selecting the appropriate screening procedures. Chapter 4 of ASCE 41-17 summarizes Tier 1 screening procedures, while C

22、hapters 5 and 6 summarize Tier 2 deficiency-based procedures and Tier 3 system- atic procedures for evaluation and retrofit, respectively. Chapter 7 of ASCE 41-17 details analysis procedures referenced in ACI 369.1, including linear and nonlinear analysis procedures, accep- tance criteria, and alter

23、native methods for determining modeling parameters and acceptance criteria. Chapter 8 of ASCE 41-17 provides geotechnical engineering provisions for building founda- tions and assessment of seismic-geologic site hazards. References to these chapters can be found throughout the standard. The design p

24、rofessional 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 design professional is referred to FEMA 306, FEMA 307, and FEMA 308 for information

25、on evaluation and repair of damaged concrete wall components. This standard does not provide modeling procedures, accep- tance criteria, and rehabilitation measures for concrete-encased steel composite components. Future versions will provide provision updates for concrete moment frames and will add

26、 provisions for concrete components and systems omitted in the present version of the standard. 1 ACI 369.1-17 was adopted September 22, 2017 and published October 2017. Copyright 2017, American Concrete Institute. All rights reserved including rights of reproduction and use in any form or by any me

27、ans, including the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for sound or visual reproduc- tion or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprieto

28、rs.CONTENTS PREFACE, p. 1 INTRODUCTION, p. 3 CHAPTER 1GENERAL, p. 5 1.1Scope, p. 5 CHAPTER 2MATERIAL PROPERTIES AND CONDITION ASSESSMENT, p. 6 2.1General, p. 6 2.2Properties of in-place materials and components, p. 6 2.3Condition assessment, p. 15 2.4Knowledge factor, p. 17 CHAPTER 3GENERAL ASSUMPTI

29、ONS AND REQUIREMENTS, p. 18 3.1Modeling and design, p. 18 3.2Strength and deformability, p. 21 3.3Flexure and axial loads, p. 22 3.4Shear and torsion, p. 24 3.5Development and splices of reinforcement, p. 25 3.6Connections to existing concrete, p. 29 3.7Retrofit measures, p. 31 CHAPTER 4CONCRETE MOM

30、ENT FRAMES, p. 32 4.1Types of concrete moment frames, p. 32 4.2Reinforced concrete beam-column moment frames, p. 33 4.3Post-tensioned concrete beam-column moment frames, p. 43 4.4Slab-column moment frames, p. 46 CHAPTER 5PRECAST CONCRETE FRAMES, p. 53 5.1Types of precast concrete frames, p. 53 5.2Pr

31、ecast concrete frames expected to resist seismic forces, p. 53 5.3Precast concrete frames not expected to resist seismic forces directly, p. 54 CHAPTER 6CONCRETE FRAMES WITH INFILLS, p. 56 6.1Types of concrete frames with infills, p. 56 6.2Concrete frames with masonry infills, p. 56 6.3Concrete fram

32、es with concrete infills, p. 60 CHAPTER 7CONCRETE STRUCTURAL WALLS, p. 63 7.1Types of concrete structural walls and associated components, p. 63 7.2Reinforced concrete structural walls, wall segments, and coupling beams, p. 65 CHAPTER 8PRECAST CONCRETE STRUCTURAL WALLS, p. 77 8.1Types of precast str

33、uctural walls, p. 77 8.2Precast concrete structural walls and wall segments, p. 78 CHAPTER 9CONCRETE BRACED FRAMES, p. 83 9.1Types of concrete-braced frames, p. 83 9.2General, p. 83 9.3Stiffness of concrete braced frames, p. 83 9.4Strength of concrete-braced frames, p. 84 9.5Acceptance criteria for

34、concrete-braced frames, p. 84 9.6Retrofit measures for concrete-braced frames, p. 85 CHAPTER 10CAST-IN-PLACE CONCRETE DIAPHRAGMS, p. 86 10.1Components of cast-in-place concrete diaphragms, p. 86 10.2Analysis, modeling, and acceptance criteria for cast-in-place concrete diaphragms, p. 86 10.3Retrofit

35、 measures for cast-in-place concrete diaphragms, p. 87 CHAPTER 11PRECAST CONCRETE DIAPHRAGMS, p. 88 11.1Components of precast concrete diaphragms, p. 88 11.2Analysis, modeling, and acceptance criteria for precast concrete diaphragms, p. 88 11.3Retrofit measures for precast concrete diaphragms, p. 88

36、 CHAPTER 12CONCRETE FOUNDATIONS, p. 89 12.1Types of concrete foundations, p. 89 12.2Analysis of existing concrete foundations, p. 90 12.3Evaluation of existing condition, p. 90 12.4Retrofit measures for concrete foundations, p. 91 CHAPTER 13NOTATION AND DEFINITIONS, p. 93 13.1Notation, p. 93 13.2Def

37、initions, p. 98 REFERENCES, p. 104 Authored references, p. 106 American Concrete Institute Copyrighted Materialwww.concrete.org 2 STANDARD REQUIREMENTS FOR SEISMIC EVALUATION AND RETROFIT OF EXISTING CONCRETE BUILDINGS (ACI 369.1-17)INTRODUCTION Earthquake reconnaissance has clearly demonstrated tha

38、t existing concrete buildings designed before the introduction of seismic design codes in the 1980s are more vulnerable to severe damage or collapse when subjected to strong ground motion than concrete buildings built after that period. Seismic rehabilitation of existing buildings where new componen

39、ts are added or existing components are modified or retrofitted with new materials, or both, can be used to mitigate the risk to damage in future earthquakes. Seismic rehabilitation is encouraged not only to reduce the risk of damage and injury in future earthquakes, but also to extend the life of e

40、xisting buildings and reduce using new materials in the promotion of sustainability objectives. It is not possible to codify all problems encountered in the process of performing the seismic evaluation and retrofit of rein- forced concrete buildings, nor is the intent of the standard to do so. The s

41、tandard provides a basic framework for modeling and evaluation of structures that reflects the latest information available from researchers and practicing engineers, so that seismic evaluation and retrofit can be performed with a consistent set of criteria. Many provisions in the standard rely on t

42、he use of sound engineering judgement for their implementation. The commentary of the standard provides references that describe in detail the implementation of methodologies adopted in the standard. Keywords: acceptance criteria; building; deformation-controlled; dynamic analysis; earthquake; force

43、-controlled; modeling parameters; nonlinear analysis; retrofit; seismic evaluation. American Concrete Institute Copyrighted Materialwww.concrete.orgSTANDARD REQUIREMENTS FOR SEISMIC EVALUATION AND RETROFIT OF EXISTING CONCRETE BUILDINGS (ACI 369.1-17) 3THIS PAGE INTENTIONALLY LEFT BLANK. American Co

44、ncrete Institute Copyrighted Materialwww.concrete.org 4 STANDARD REQUIREMENTS FOR SEISMIC EVALUATION AND RETROFIT OF EXISTING CONCRETE BUILDINGS (ACI 369.1-17)CHAPTER 1GENERAL 1.1Scope This standard sets forth requirements for the seismic eval- uation and retrofit of concrete components of the seism

45、ic- force-resisting system of an existing building. These building standard requirements apply to existing concrete compo- nents, retrofitted concrete components, and new concrete components. Provisions of this standard do not apply to concrete-encased steel composite components. Chapter 2 specifies

46、 data collection procedures for obtaining material properties and performing condition assessments. Chapter 3 provides general analysis and design requirements for concrete components. Chapters 4 through 9 provide modeling procedures; component strengths; acceptance criteria and retrofit measures fo

47、r cast-in-place and precast concrete moment frames; concrete frames with masonry infills; cast-in-place and precast concrete structural walls; and concrete braced frames. Chapters 10 through 12 provide modeling procedures, strengths, acceptance criteria, and retrofit measures for concrete diaphragms

48、 and concrete foundation systems. C1.1Scope These standard requirements were developed based on the best knowledge of the seismic performance of existing concrete buildings at the time of publication. These require- ments are not intended to restrict the licensed design profes- sional from using new

49、 information that becomes available before the issuance of the next edition of this standard. Such new information can include tests conducted to address specific building conditions. This standard provides short descriptions of potential seismic retrofit measures for each concrete building system. The licensed design professional, however, is referred to FEMA 547 for detailed information on seismic retrofit measures for concrete buildings. Repair techniques for earth- quake-damaged concrete components are not included in this s