ACI 435R 2020

$59.04

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

Published By	Publication Date	Number of Pages
ACI	2020	60

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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.

PDF Catalog

PDF Pages	PDF Title
3	TITLE PAGE
4	CHAPTER 1—INTRODUCTION AND SCOPE 1.1—Introduction 1.2—Scope
5	CHAPTER 2—NOTATION AND DEFINITIONS 2.1—Notation 2.2—Definitions CHAPTER 3—MATERIAL PROPERTIES 3.1—Objective
6	3.2—Material properties affecting deflection 3.3—Concrete material properties
11	3.4—Reinforcement material properties CHAPTER 4—DEFLECTION OF REINFORCED CONCRETE ONE-WAY FLEXURAL MEMBERS 4.1—General
12	4.2—Control of deflection
13	4.3—Short-term deflection calculation
20	4.4—Long-term deflection calculation
23	4.5—Temperature-induced deflections
24	CHAPTER 5—DEFLECTION OF A TWO-WAY SLAB SYSTEM 5.1—Introduction
25	5.2—Deflection calculation methods for two-way slab systems
28	5.3—Minimum thickness requirements
30	5.4—Loads for deflection calculation
33	5.5—Variability of deflections
34	5.6—Allowable deflections CHAPTER 6—REDUCING DEFLECTION OF CONCRETE MEMBERS 6.1—Introduction 6.2—Design techniques
36	6.3—Construction techniques
37	6.4—Materials selection
38	6.5—Summary CHAPTER 7—REFERENCES Authored documents
41	APPENDIX A—DEFLECTION DESIGN EXAMPLES Example A.1—Deflection of a simply supported slab
45	Example A.2—Age-adjusted deflection of simply supported slab
46	Example A.3—Short- and long-term deflection of a four-span continuous beam
50	Example A.4—Temperature-induced deflections APPENDIX B—TWO-WAY SLAB DEFLECTION EXAMPLES Example B.1—Deflection design example for long-term deflection of a two-way slab
54	Example B.2—Deflection calculation for a flat plate using the crossing beam method
56	Example B.3—Minimum thickness calculation