ACI 423.10R 2016 wERRATA2021
$43.60
ACI PRC-423.10-16 Guide to Estimating Prestress Losses with ERRATA as of March 30, 2021
| Published By | Publication Date | Number of Pages |
| ACI | 2016 | 69 |
This guide is intended for estimation of prestress losses in concrete structures. Methods presented include lump sum, simplified approaches addressing individual source of loss, and additional estimation methods. They address losses in pretensioned and post-tensioned members, including bonded, unbonded, and external tendons. Note that these estimation methods have not been evaluated for relative merits. A discussion of the variability of prestress losses caused by the variability in concrete properties is also presented. Several example problems are included. Keywords: creep; friction; post-tensioning; prestress loss; prestressed concrete; relaxation; shrinkage.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | TITLE PAGE |
| 4 | CHAPTER 1—INTRODUCTION 1.1—Introduction 1.2—Scope |
| 5 | 1.3—Historical development 1.4—Guide organization and use |
| 6 | CHAPTER 2—NOTATION AND DEFINITIONS 2.1—Notation |
| 9 | 2.2—Definitions CHAPTER 3—LUMP-SUM METHOD 3.1—Scope 3.2—Historical code requirements |
| 10 | 3.3—Industry practice 3.4—Measured losses |
| 14 | CHAPTER 4—INITIAL LOSSES 4.1—Scope |
| 15 | 4.2—Pretensioning losses before transfer |
| 18 | 4.3—Elastic shortening losses in pretensioned members |
| 20 | 4.4—Post-tensioning losses during tensioning and transfer |
| 23 | 4.5—Elastic shortening loss in post-tensioned members |
| 24 | 4.6—Elastic gain under superimposed loads CHAPTER 5—LONG-TERM LOSSES: SIMPLIFIED METHOD 5.1—Scope |
| 25 | 5.2—Creep of concrete (∆fpCR) 5.3—Concrete shrinkage (∆fpSH) |
| 27 | 5.5—AASHTO LRFD approximate estimate of time-dependent losses CHAPTER 6—LONG-TERM LOSSES: DETAILED METHODS 6.1—Scope 6.2—Creep and shrinkage models |
| 28 | 6.3—Age-adjusted effective modulus approaches |
| 32 | 6.4—Incremental time-step method |
| 33 | 6.5—Computer programs 6.6—Effects of deck temperature during casting of composite deck or topping |
| 34 | CHAPTER 7—VARIABILITY OF LOSS CALCULATIONS 7.1—Objective 7.2—Scope 7.3—Contributions to prestress loss |
| 35 | 7.4—Modulus of elasticity |
| 37 | 7.5—Creep 7.6—Variational analysis |
| 38 | 7.7—Shrinkage case study 7.8—Self-consolidating concrete |
| 39 | 7.9—Conclusions |
| 40 | CHAPTER 8—EXAMPLES 8.1—Pretensioned double-tee beam |
| 50 | 8.2—Post-tensioned slab with unbonded tendons |
| 54 | 8.3—Post-tensioned beam with bonded tendons |
| 59 | 8.4—Example with heat of hydration during casting |
| 63 | CHAPTER 9—REFERENCES Authored documents |
