ACI PRC-435-20: Report on Deflection of Nonprestressed Concrete Structures

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Description

This report presents a consolidated treatment of initial and time-dependent deflection of nonprestressed reinforced concrete members such as simple and continuous beams and one-way and two-way slab systems. It presents the current state of practice of deflection prediction as well as analytical methods for computer use in deflection estimation. Topics include material properties, deflection of reinforced concrete one-way flexural members, deflection of two-way slab systems, and reducing deflection of concrete members.

Keywords:

camber; cracking; creep; curvature; deflection; modulus of rupture; moments of inertia; serviceability; shrinkage; time-dependent deflection.

 

Document Details

Author: ACI Committee 435

Pages: 56

ISBN: 9781641951289

Categories: Cracking, Deflections

Formats: Printed Document or Protected PDF/Web View

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE, p. 2

1.1—Introduction, p. 2

1.2—Scope, p. 2

CHAPTER 2—NOTATION AND DEFINITIONS, p. 3

2.1—Notation, p. 3

2.2—Definitions, p. 3

CHAPTER 3—MATERIAL PROPERTIES, p. 3

3.1—Objective, p. 3

3.2—Material properties affecting deflection, p. 4

3.3—Concrete material properties, p. 4

3.4—Reinforcement material properties, p. 9

CHAPTER 4—DEFLECTION OF REINFORCED CONCRETE ONE-WAY FLEXURAL MEMBERS, p. 9

4.1—General, p. 9

4.2—Control of deflection, p. 10

4.3—Short-term deflection calculation, p. 11

4.4—Long-term deflection calculation, p. 18

4.5—Temperature-induced deflections, p. 21

CHAPTER 5—DEFLECTION OF A TWO-WAY SLAB SYSTEM, p. 22

5.1—Introduction, p. 22

5.2—Deflection calculation methods for two-way slab systems, p. 23

5.3—Minimum thickness requirements, p. 26

5.4—Loads for deflection calculation, p. 28

5.5—Variability of deflections, p. 31

5.6—Allowable deflections, p. 32

CHAPTER 6—REDUCING DEFLECTION OF CONCRETE MEMBERS, p. 32

6.1—Introduction, p. 32

6.2—Design techniques, p. 32

6.3—Construction techniques, p. 34

6.4—Materials selection, p. 35

6.5—Summary, p. 36

CHAPTER 7—REFERENCES, p. 36

Authored documents, p. 36

APPENDIX A—DEFLECTION DESIGN EXAMPLES, p. 39

Example A.1—Deflection of a simply supported slab, p. 39

Example A.2—Age-adjusted deflection of simply supported slab, p. 43

Example A.3—Short- and long-term deflection of a fourspan continuous beam, p. 44

Example A.4—Temperature-induced deflections, p. 48

APPENDIX B—TWO-WAY SLAB DEFLECTION EXAMPLES, p. 48

Example B.1—Deflection design example for long-term deflection of a two-way slab, p. 48

Example B.2—Deflection calculation for a flat plate using the crossing beam method, p. 52

Example B.3—Minimum thickness calculation, p. 54

ERRATA INFO

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