423.3R-05: Recommendations for Concrete Members Prestressed with Unbonded Tendons

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This report is a guide for the design of flexural concrete members in buildings post-tensioned with unbonded tendons. Suggestions for revisions and additions to ACI 318 regarding this subject are presented. Consideration is given to determination of fire endurance, design for seismic forces, and design for catastrophic loadings, in addition to design for gravity and lateral loads. Recommendations concerning details and properties of tendons, protection against corrosion, and construction procedures are presented.

Keywords: anchorage (structural); beams (supports); bond (concrete to reinforcement); concrete construction; concrete slabs; cover; cracking

(fracturing); earthquake-resistant structures; fire resistance; flat concrete plates; flat concrete slabs; joints (junctions); loads (forces); post-tensioning; prestressed concrete; prestressing; prestressing steels; shear properties; stresses; structural analysis; structural design; unbonded prestressing.


Document Details

Author: Joint ACI-ASCE Committee 423

Publication Year: 2005

Pages: 21

ISBN: 9780870311864

Categories: Prestressed Concrete

Formats: PDF

This document is Historical

Table of Contents

Chapter 1—Introduction




1.4—Notations and definitions

Chapter 2—Design considerations


2.2—Continuous members

2.3—Corrosion protection

2.4—Fire resistance

2.5—Earthquake loading

Chapter 3—Design


3.2—One-way systems

3.3—Two-way systems

3.4—Tendon stress at factored load

3.5—Prestress losses

3.6—Average prestress

3.7—Supporting walls and columns

3.8—Serviceability requirements

3.9—Design strength

3.10—Anchorage zone reinforcement

Chapter 4—Materials


4.2—Protection materials

4.3—Protection of anchorage zones

4.4—Concrete cover

Chapter 5—Construction

5.1—Construction joints

5.2—Closure strips

5.3—Placement of tendons

5.4—Concrete placement and curing

5.5—Stressing operations

5.6—Form removal and reshoring

5.7—Welding and burning

5.8—Protection of tendons

Chapter 6—References

6.1—Referenced standards and reports

6.2—Cited references


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