ACI 550.5 2018 wERRATA2022
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ACI CODE-550.5-18:Code Requirements for the Design of Precast Concrete Diaphragms for Earthquake Motions (ACI 550.5) and Commentary (ACI 550.5R) with ERRATA as of September 30, 2022
| Published By | Publication Date | Number of Pages |
| ACI | 2018 |
This standard describes code requirements for the design of precast concrete diaphragms subject to earthquake motions where used under the design provisions of ASCE/SEI 7-16 Section 12.10.3 and ACI 318. The response of precast concrete diaphragms under earthquake motions depends primarily on the strength, stiffness, and deformation capacities of the connectors and the reinforcement at joints between the precast concrete members. The seismic forces specified in ASCE/SEI 7 for the design of precast concrete diaphragms, their chords, and collectors in structures assigned to Seismic Design Category (SDC) C, D, E, or F are tied to force reduction factors specified in ASCE/SEI 7-16 Chapter 12, and to the shear overstrength provided by the connections and the reinforcement at joints specified in ASCE/SEI 7-16 Chapter 14. The shear overstrength depends on the design methodology, elastic or ductile, used for the diaphragm and targets elastic response for the maximum considered earthquake for shear connections regardless of the design option selected. The design option that can be used depends on the assigned design category and on the span and aspect ratio of the diaphragm. The selection of the design option is associated with minimum requirements for the tensile deformation capacity of the connections and the reinforcement at joints. Keywords: connections; diaphragms; earthquake-resistant structures; precast concrete; seismic design.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | TITLE PAGE |
| 5 | CHAPTER 1—GENERAL 1.1—Introduction CHAPTER 1—GENERAL 1.1—Introduction |
| 6 | 1.2—Scope 1.3—Structural drawings 1.2—Scope 1.3—Structural drawings |
| 7 | 1.4—Units 1.4—Units |
| 8 | CHAPTER 2—NOTATION AND DEFINITIONS 2.1—Notation 2.2—Definitions CHAPTER 2—NOTATION AND DEFINITIONS 2.1—Notation 2.2—Definitions |
| 10 | CHAPTER 3—REFERENCED STANDARDS CHAPTER 3—REFERENCED STANDARDS |
| 11 | CHAPTER 4—GENERAL CONSIDERATIONS 4.1—General design considerations 4.2—Materials 4.3—Minimum thickness 4.4—Tolerances CHAPTER 4—GENERAL CONSIDERATIONS 4.1—General design considerations 4.2—Materials 4.3—Minimum thickness 4.4—Tolerances |
| 13 | CHAPTER 5—DESIGN FORCES, SEISMIC DEMAND LEVELS, AND ANALYSIS 5.1—General 5.2—Diaphragm seismic design force CHAPTER 5—DESIGN FORCES, SEISMIC DEMAND LEVELS, AND ANALYSIS 5.1—General 5.2—Diaphragm seismic design force |
| 14 | 5.3—Diaphragm seismic demand level 5.3—Diaphragm seismic demand level |
| 15 | 5.4—Diaphragm nominal shear strength 5.4—Diaphragm nominal shear strength |
| 17 | 5.5—Diaphragm modeling and analysis 5.5—Diaphragm modeling and analysis |
| 19 | CHAPTER 6—DIAPHRAGM DESIGN OPTIONS 6.1—General CHAPTER 6—DIAPHRAGM DESIGN OPTIONS 6.1—General |
| 22 | 6.2—Elastic design option 6.3—Basic design option 6.4—Reduced design option 6.2—Elastic design option 6.3—Basic design option 6.4—Reduced design option |
| 23 | CHAPTER 7—DIAPHRAGM CONNECTIONS AND REINFORCEMENT AT JOINTS 7.1—General 7.2—Connection classifications CHAPTER 7—DIAPHRAGM CONNECTIONS AND REINFORCEMENT AT JOINTS 7.1—General 7.2—Connection classifications |
| 24 | 7.3—Deformed bar reinforcement 7.4—Special inspection 7.3—Deformed bar reinforcement 7.4—Special inspection |
| 25 | R8—COMMENTARY REFERENCES AND ACRONYMS R8.1—References R8.2—Acronyms R8—COMMENTARY REFERENCES AND ACRONYMS R8.1—References R8.2—Acronyms |
