5ta edicion Wei-Wen Yu Roger A Laboube - Cold-Formed Steel Design-Wiley (2019)-1-6

Cold-Formed Steel Design
Cold-Formed Steel Design
Fifth Edition
Wei-Wen Yu
Missouri University of Science and Technology
Rolla, Missouri
Roger A. LaBoube
Missouri University of Science and Technology
Rolla, Missouri
Helen Chen
American Iron and Steel Institute
Washington, DC
This edition first published 2020
©2020 John Wiley & Sons, Inc.
Edition History
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Library of Congress Cataloging-in-Publication Data
Names: Yu, Wei-Wen, author. | LaBoube, Roger A., author. | Chen,
Helen, author.
Title: Cold-formed steel design / Wei-Wen Yu and Roger A. LaBoube, Missour University of Science
and Tech; Helen Chen, American Iron and Steel Institute.
Description: Fifth edition. | Hoboken : Wiley, 2020. | Includes
bibliographical references and index.
Identifiers: LCCN 2019023220 (print) | LCCN 2019023221 (ebook) | ISBN
9781119487395 (cloth) | ISBN 9781119487388 (adobe pdf) | ISBN
9781119487418 (epub)
Subjects: LCSH: Building, Iron and steel. | Sheet-steel. | Thin-walled
structures. | Steel—Cold working.
Classification: LCC TA684 .Y787 2020 (print) | LCC TA684 (ebook) | DDC
624.1/821—dc23
LC record available at https://lccn.loc.gov/2019023220
LC ebook record available at https://lccn.loc.gov/2019023221
Cover Design: Wiley
Cover Image: Courtesy of Steel Framing Alliance
Set in 10/12pt TimesLTStd by SPi Global, Chennai, India
10 9 8 7 6 5 4 3 2 1
CONTENTS
CHAPTER 1
Preface
ix
INTRODUCTION
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
CHAPTER 2
General Remarks
Types of Cold-Formed Steel Sections and Their Applications
Metal Buildings and Industrialized Housing
Methods of Forming
Research and Design Specifications
General Design Considerations of Cold-Formed Steel Construction
Economic Design and Optimum Properties
Design Basis
Serviceability
1
2
7
13
15
21
26
27
35
MATERIALS USED IN COLD-FORMED STEEL CONSTRUCTION
37
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
2.12
37
44
45
45
47
48
48
51
53
54
55
57
General Remarks
Yield Stress, Tensile Strength, and Stress–Strain Curve
Modulus of Elasticity, Tangent Modulus, and Shear Modulus
Ductility
Weldability
Fatigue Strength and Toughness
Influence of Cold Work on Mechanical Properties of Steel
Utilization of Cold Work of Forming
Effect of Temperature on Mechanical Properties of Steel
Testing of Full Sections and Flat Elements
Residual Stresses Due to Cold Forming
Effect of Strain Rate on Mechanical Properties
v
vi
CONTENTS
CHAPTER 3
STRENGTH OF THIN ELEMENTS AND DESIGN CRITERIA
59
3.1
3.2
3.3
59
59
3.4
3.5
3.6
3.7
CHAPTER 4
CHAPTER 5
CHAPTER 6
CHAPTER 7
General Remarks
Definitions of Terms
Structural Behavior of Compression Elements and Effective Width Design
Criteria
Perforated Elements and Members
Direct Strength Method and Consideration of Local and Distortional
Buckling
Plate Buckling of Structural Shapes
Additional Information
61
97
100
117
117
FLEXURAL MEMBERS
119
4.1
4.2
4.3
4.4
4.5
4.6
119
119
183
209
216
216
General Remarks
Bending Strength and Deflection
Design of Beam Webs
Bracing Requirements of Beams
Torsional Analysis of Beams and Combined Bending and Torsional Loading
Additional Information on Beams
COMPRESSION MEMBERS
217
5.1
5.2
5.3
5.4
5.5
5.6
217
218
226
228
228
General Remarks
Column Buckling
Local Buckling Interacting with Yielding and Global Buckling
Distortional Buckling Strength of Compression Members
Effect of Cold Work on Column Buckling
North American Design Formulas for Concentrically Loaded Compression
Members
5.7 Effective Length Factor K
5.8 Built-Up Compression Members
5.9 Bracing of Axially Loaded Compression Members
5.10 Design Examples
5.11 Compression Members in Metal Roof and Wall Systems
5.12 Additional Information on Compression Members
230
234
236
237
238
247
250
COMBINED AXIAL LOAD AND BENDING
251
6.1
6.2
6.3
6.4
6.5
6.6
6.7
251
251
253
261
265
266
283
General Remarks
Combined Tensile Axial Load and Bending
Combined Compressive Axial Load and Bending (Beam–Columns)
Member Forces Considering Structural Stability
North American Design Criteria for Beam–Column Check
Design Examples
Additional Information on Beam–Columns
CLOSED CYLINDRICAL TUBULAR MEMBERS
285
7.1
7.2
7.3
285
285
285
General Remarks
Types of Closed Cylindrical Tubes
Flexural Column Buckling