Description
This document applies to structures in regions of high seismic risk or to structures assigned to high seismic performance or design categories. It defines the minimum experimental evidence that can be deemed to satisfy the use of unbonded post-tensioned precast structural walls (shear walls) for bearing wall and building frame special reinforced concrete shear wall systems, as defined in ASCE/SEI 7-10, when those walls do not fully satisfy the intent of the prescriptive requirements of Chapter 18 of ACI 318-14. This document includes mandatory Acceptance Criteria and nonmandatory Commentary, and has been written in such a form that its requirements can be coordinated directly with the requirements for special precast structural walls in 18.11 of ACI 318-14. Among the subjects covered are requirements for the procedures that shall be used to design unbonded post-tensioned precast test modules and their configurations, as well as requirements for testing, reporting, and assessing satisfactory performance of the test modules.
The references of the Commentary provide documentary evidence, additional to the references of Chapter 18 of ACI 318R-14, that support the acceptance criteria. Consistent with the approach of ACI 318, no comparison is made, either in the body of the Acceptance Criteria or Commentary, of research results for precast test modules satisfying ACI 318 with those for modules that, although not satisfying ACI 318, do satisfy the Acceptance Criteria. Such comparisons, both experimental and analytical, are available in the Commentary references.
In this document, consistent with the format of ACI 318-14, the word “Section” is not included before a reference to a section of ACI 318-14. To more clearly designate a section in this document, however, the word “Section” is used before any reference to a section of this document.
The section numbering for the Commentary is the same as that for the Standard, with numbers preceded by an “R” and the text in italics to distinguish them from the corresponding section numbers of the Standard.
Keywords:
acceptance criteria; coupling element; drift; drift angle; energy dissipation; lateral resistance; post-tensioning; precast concrete; prestressed concrete; seismic design; shear wall; structural wall; test module; toughness.
Table of Contents
CHAPTER 1—INTRODUCTION
1.1—Introduction
1.2—Historical background of AAC
1.3—Scope and objectives of this guide
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
2.2—Definitions
CHAPTER 3—TYPICAL MATERIAL AND THERMAL CHARACTERISTICS AND MANUFACTURE OF AAC
3.1—Materials used in manufacturing of AAC
3.2—Typical mechanical and thermal characteristics of AAC
3.3—Thermal considerations
3.4—Manufacture of AAC
3.5—Typical dimensions of AAC units
3.6—Dimensional tolerances
3.7—Identification and marking of AAC units
CHAPTER 4—STRUCTURAL DESIGN OF REINFORCED AAC PANELS
4.1—Applications of AAC panels
4.2—Overview of proposed design provisions for reinforced AAC panels
CHAPTER 5—HANDLING, ERECTION, AND CONSTRUCTION WITH AAC PANELS
5.1—Handling of AAC panels
5.2—Erection of AAC wall panels
5.3—Erection of AAC floor and roof panels
5.4—Electrical and plumbing installations in AAC
5.5—Exterior finishes for AAC
5.6—Interior finishes for AAC panels
CHAPTER 6—TECHNICAL JUSTIFICATION FOR PROPOSED DESIGN PROVISIONS
6.1—Key mechanical characteristics of AAC
6.2—Bond strength between factory-installed wire reinforcement and AAC
6.3—Flexural design of AAC beams
6.4—Control of deflections
6.5—Shear design of AAC beam elements
6.6—Design of AAC shear walls
6.7—Behavior of AAC panels under eccentric axial compression
6.8—Special provisions to avoid longitudinal cracking at location of vertical reinforcement
6.9—Design of AAC diaphragms
CHAPTER 7—REFERENCES
Authored documents
APPENDIX A
A.1—Example 1: Design of AAC floor panel
A.2—Example 2: Design of AAC shear wall
A.3—Example 3: Design of AAC diaphragm
A.4—Example 4: Design of load-bearing vertical wall panel subjected to eccentric gravity and out-of-plane wind loads
A.5—Example 2: design of AAC shear wall (metric units)
APPENDIX B—TYPICAL DESIGN DETAILS
B.1—Cladding wall panel systems
B.2—Load-bearing vertical wall panel systems
B.3—Floor and roof details