كتاب Cold-Formed Steel Design

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Cold-Formed Steel Design
Third Edition
Wei-wen Yu, Ph.d., P.e.
Curators’ Professor Emeritus of Civil Engineering
Director, Center for Cold-formed Steel Structures
University of Missouri-rolla

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Contents
Preface Ix
1. Introduction 1
1.1 General Remarks 1
1.2 Types of Cold-formed Steel Sections and Their
Applications 3
1.3 Standardized Metal Buildings and Industrialized
Housing 9
1.4 Methods of Forming 15
1.5 Research and Design Specifications 22
1.6 General Design Considerations of Cold-formed
Steel Construction 28
1.7 Economic Design and Optimum Properties 37
2. Materials Used in Cold-formed Steel Construction 39
2.1 General Remarks 39
2.2 Yield Point, Tensile Strength, and
Stress–strain Curve 40
2.3 Modulus of Elasticity, Tangent Modulus, and Shear
Modulus 41
2.4 Ductility 50
2.5 Weldability 53
2.6 Fatigue Strength and Toughness 54
2.7 Influence of Cold Work on Mechanical Properties of
Steel 54
2.8 Utilization of Cold Work of Forming 58
2.9 Effect of Temperature on Mechanical Properties
Of Steel 65
2.10 Testing of Full Sections and Flat Elements 66
2.11 Residual Stresses Due to Cold Forming 67
2.12 Effect of Strain Rate on Mechanical Properties 68
3. Strength of Thin Elements and Design Criteria 71
3.1 General Remarks 71vi Contents
3.2 Definitions of General Terms 71
3.3 Design Basis 80
3.4 Serviceability 88
3.5 Structural Behavior of Compression Elements and
Design Criteria 89
3.6 Structural Behavior of Perforated Elements 139
3.7 Plate Buckling of Structural Shapes 143
3.8 Additional Information 145
4. Flexural Members 146
4.1 General Remarks 146
4.2 Bending Strength and Deflection 147
4.3 Design of Beam Webs 252
4.4 Bracing Requirements of Beams 297
4.5 Torsional Analysis of Beams 310
4.6 Additional Information on Purlins 311
5. Compression Members 312
5.1 General Remarks 312
5.2 Yielding 313
5.3 Flexural Column Buckling 313
5.4 Torsional Buckling and Torsional–flexural
Buckling 317
5.5 Effect of Local Buckling on Column Strength 329
5.6 Effect of Cold Work on Column Buckling 333
5.7 Aisi Design Formulas for Concentrically Loaded
Compression Members 334
5.8 Effective Length Factor K 342
5.9 Design Examples 346
5.10 Wall Studs 357
5.11 Additional Information on Compression
Members 359
6. Combined Axial Load and Bending 360
6.1 General Remarks 360
6.2 Combined Tensile Axial Load and Bending 361
6.3 Combined Compressive Axial Load and Bending
(Beam-columns) 365
6.4 Aisi Design Criteria 376
6.5 Additional Information on Beam-columns 407
7. Cylindrical Tubular Members 408
7.1 General Remarks 408contents Vii
7.2 Types of Cylindrical Tubes 408
7.3 Flexural Column Buckling 409
7.4 Local Buckling 410
7.5 Aisi Design Criteria 417
7.6 Design Examples 423
8. Connections 430
8.1 General Remarks 430
8.2 Types of Connectors 430
8.3 Welded Connections 430
8.4 Bolted Connections 466
8.5 Screw Connections 502
8.6 Other Fasteners 507
8.7 Rupture Failure of Connections 510
8.8 I- or Box-shaped Compression Members Made by
Connecting Two C-sections 512
8.9 I-beams Made by Connecting Two C-sections 514
8.10 Spacing of Connections in Compression
Elements 521
9. Steel Shear Diaphragms and Shell Roof Structures 526
9.1 General Remarks 526
9.2 Steel Shear Diaphragms 526
9.3 Structural Members Braced by Diaphragms 546
9.4 Shell Roof Structures 567
10. Corrugated Sheets 588
10.1 General Remarks 588
10.2 Applications 588
10.3 Sectional Properties and Design of Arc-andtangent-type Corrugated Sheets 589
10.4 Sectional Properties and Design of Trapezoidal-type
Corrugated Sheets 599
11. Composite Design 600
11.1 General Remarks 600
11.2 Steel-deck-reinforced Composite Slabs 601
11.3 Composite Beams or Girders With Cold-formed
Steel Deck 602
12. Introduction to Stainless Steel Design 607
12.1 General Remarks 607viii Contents
12.2 Differences Between the Specifications for Carbon
Steels and Stainless Steels 610
13. Computer-aided Design 615
13.1 General Remarks 615
13.2 Computer Programs for the Design of Cold-formed
Steel Structures 615
14. Residential Construction 619
14.1 General Remarks 619
14.2 Prescriptive Method 619
14.3 Aisi Residential Manual 620
14.4 Framing Standards 621
Appendix a: Thickness of Base Metal 622
Appendix B: Torsion 625
Appendix C: Formulas for Computing Cross-sectional
Property y 644
Nomenclature 646
Acronyms and Abbreviations 664
Conversion Table 666
References 667
Index 75

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