Bridge Design Practice 5.2 • October 2022 Chapter 5.2 – Post-Tensioned Concrete Girders 5.2-1 Copyright 2022 California Department of Transportation. All Rights Reserved CHAPTER 5.2 POST-TENSIONED CONCRETE GIRDERS TABLE OF CONTENTS 5.2.1 INTRODUCTION ........................................................................................ 5.2-3 5.2.1.1 General ............................................................................................ 5.2-3 5.2.1.2 Basic Concepts ................................................................................ 5.2-3 5.2.2 MATERIAL PROPERTIES.......................................................................... 5.2-5 5.2.3 GIRDER LAYOUT AND STRUCTURAL SECTION .................................... 5.2-7 5.2.4 PRESTRESSING CABLE LAYOUT ........................................................... 5.2-8 5.2.5 PRESTRESS LOSSES FOR POST-TENSIONING .................................. 5.2-10 5.2.5.1 Instantaneous Losses .................................................................... 5.2-11 5.2.5.2 Long-Term Losses ......................................................................... 5.2-16 5.2.6 SECONDARY MOMENTS AND RESULTING PRESTRESS LOSS ........ 5.2-18 5.2.7 STRESS LIMITATIONS ............................................................................ 5.2-19 5.2.7.1 Prestressing Tendons .................................................................... 5.2-19 5.2.7.2 Concrete ........................................................................................ 5.2-20 5.2.8 STRENGTH DESIGN ............................................................................... 5.2-21 5.2.9 DEFLECTION AND CAMBER .................................................................. 5.2-21 5.2.10 POST-TENSIONING ANCHOR DESIGN ................................................. 5.2-23 5.2.11 DESIGN PROCEDURE ............................................................................ 5.2-25 5.2.12 DESIGN EXAMPLE .................................................................................. 5.2-33 5.2.12.1 Prestressed Concrete Girder Bridge Data ..................................... 5.2-33 5.2.12.2 Design Requirements .................................................................... 5.2-34 5.2.12.3 Select Girder Layout and Section .................................................. 5.2-34 5.2.12.4 Determine Basic Design Data ........................................................ 5.2-36 5.2.12.5 Design Deck Slab and Soffit .......................................................... 5.2-36 5.2.12.6 Select Prestressing Cable Path ..................................................... 5.2-37 5.2.12.7 Calculate Post-Tensioning Losses................................................. 5.2-46 5.2.12.8 Calculate Cable Path Eccentricities ............................................... 5.2-53 5.2.12.9 Calculate Moment Coefficients ...................................................... 5.2-56
CHAPTER 5.2 POST-TENSIONED CONCRETE GIRDERS
Jun 18, 2023
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