ACI 447R 18:2018 Edition

$29.52

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

Published By	Publication Date	Number of Pages
ACI	2018	36

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Category: ACI

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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.

PDF Catalog

PDF Pages	PDF Title
3	TITLE PAGE
4	CHAPTER 1—INTRODUCTION AND SCOPE 1.1—Introduction 1.2—Scope CHAPTER 2—NOTATION AND DEFINITIONS 2.1—Notation
5	2.2—Defintions CHAPTER 3—BACKGROUND 3.1—Qualitative introduction to twisting moments in slabs
6	3.2—Behavior of linear-elastic isotropic slabs 3.3—Equilibrium in slabs 3.4—Principal axes
7	3.5—Orthogonal reinforcement and equilibrium for twisting moments 3.6—Effects of slab geometry on twisting moments
8	3.7—Traditional slab design methods 3.8—Finite element analysis (FEA)-based slab design resultants
9	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
10	4.4—Design using element nodal forces
11	4.5—Design using twist-free analysis
12	CHAPTER 5—COMPARISON OF DESIGN METHODS 5.1—Sensitivity to angle of principal axes
13	5.2—Typical design conditions
23	CHAPTER 6—TWO-WAY WALLS 6.1—General considerations 6.2—Impact of twisting moment on walls exhibiting two adjacent fixed edges
26	CHAPTER 7—SHELL STRUCTURES 7.1—General considerations 7.2—Typical bulk material storage hemisphere
27	7.3—Typical loading conditions 7.4—Typical design regions
31	CHAPTER 8—REFERENCES Authored documents