Table of Contents
CHAPTER 1—INTRODUCTION
1.1—Introduction
1.2—Scope
1.3—Historical development
1.4—Guide organization and use
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
2.2—Definitions
CHAPTER 3—LUMP-SUM METHOD
3.1—Scope
3.2—Historical code requirements
3.3—Industry practice
3.4—Measured losses
CHAPTER 4—INITIAL LOSSES
4.1—Scope
4.2—Pretensioning losses before transfer
4.3—Elastic shortening losses in pretensioned members
4.4—Post-tensioning losses during tensioning and transfer
4.5—Elastic shortening loss in post-tensioned members
4.6—Elastic gain under superimposed loads
CHAPTER 5—LONG-TERM LOSSES: SIMPLIFIED METHOD
5.1—Scope
5.2—Creep of concrete (∆fpCR)
5.3—Concrete shrinkage (∆fpSH)
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
6.3—Age-adjusted effective modulus approaches
6.4—Incremental time-step method
6.5—Computer programs
6.6—Effects of deck temperature during casting of composite deck or topping
CHAPTER 7—VARIABILITY OF LOSS CALCULATIONS
7.1—Objective
7.2—Scope
7.3—Contributions to prestress loss
7.4—Modulus of elasticity
7.5—Creep
7.6—Variational analysis
7.7—Shrinkage case study
7.8—Self-consolidating concrete
7.9—Conclusions
CHAPTER 8—EXAMPLES
8.1—Pretensioned double-tee beam
8.2—Post-tensioned slab with unbonded tendons
8.3—Post-tensioned beam with bonded tendons
8.4—Example with heat of hydration during casting
CHAPTER 9—REFERENCES
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