447R-18: Design Guide for Twisting Moments in Slabs

447R-18: Design Guide for Twisting Moments in Slabs

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Description

This guide assists practitioners in understanding: 1) twisting moments in two-way slabs, when twisting moments are an essential consideration; 2) methods that can be used to account for twisting moments in design; and 3) the options available for each method of the various system geometries. Descriptions of twisting moments are provided theoretically and visually in the guide, and six methods of accounting for twisting moments in design are discussed. Applicability of the various methods is evaluated through a comparison of designs resulting from each method for a variety of two-way slab types and geometries. The theories described in the guide also apply to the design of two-way wall and two-way dome systems.

Keywords: finite element analysis; shell design; slab design; torsion; twist; twisting moments; wall design.

 

Document Details

Author: ACI Committee 447

Pages: 30.00

ISBN: 9781641950107

Categories: Slabs

Formats: Printed Document or PDF

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE

1.1—Introduction

1.2—Scope

CHAPTER 2—NOTATION AND DEFINITIONS

2.1—Notation

2.2—Defintions

CHAPTER 3—BACKGROUND

3.1—Qualitative introduction to twisting moments in slabs

3.2—Behavior of linear-elastic isotropic slabs

3.3—Equilibrium in slabs

3.4—Principal axes

3.5—Orthogonal reinforcement and equilibrium for twisting moments

3.6—Effects of slab geometry on twisting moments

3.7—Traditional slab design methods

3.8—Finite element analysis (FEA)-based slab design resultants

CHAPTER 4—AVAILABLE DESIGN METHODS

4.1—Finite element analysis (FEA)-based design ignoring twist

4.2—Design using the Wood and Armer method

4.3—Design using the sandwich model

4.4—Design using element nodal forces

4.5—Design using twist-free analysis

CHAPTER 5—COMPARISON OF DESIGN METHODS

5.1—Sensitivity to angle of principal axes

5.2—Typical design conditions

CHAPTER 6—TWO-WAY WALLS

6.1—General considerations

6.2—Impact of twisting moment on walls exhibiting two adjacent fixed edges

CHAPTER 7—SHELL STRUCTURES

7.1—General considerations

7.2—Typical bulk material storage hemisphere

7.3—Typical loading conditions

7.4—Typical design regions

CHAPTER 8—REFERENCES

Authored documents

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