Cold Formed Steel Structures

Wei-Wen Yu

Department of Civil Engineering, University of Missouri, Rolla, MO

6.1 Introduction 6-1

6.2 Design Standards 6-4

6.3 Design Bases 6-4

Allowable Strength Design (United States and Mexico) • Load and Resistance Factor Design (United States and Mexico) • Limit States Design (Canada)

6.4 Materials and Mechanical Properties 6-7

Yield Point, Tensile Strength, and Stress-Strain Relationship • Strength Increase from Cold Work of Forming • Modulus of Elasticity, Tangent Modulus, and Shear Modulus • Ductility

6.5 Element Strength 6-11

Maximum Flat Width to Thickness Ratios • Stiffened Elements under Uniform Compression • Stiffened Elements with Stress Gradient • Unstiffened Elements under Uniform Compression • Uniformly Compressed Elements with an Edge Stiffener • Uniformly Compressed Elements with Intermediate Stiffeners

6.6 Member Design 6-20

Sectional Properties • Linear Method for Computing Sectional Properties • Tension Members • Flexural Members • Concentrically Loaded Compression Members • Combined Axial Load and Bending • Closed Cylindrical Tubular Members

6.7 Connections and Joints 6-41

Welded Connections • Bolted Connections • Screw Connections • Rupture

6.8 Structural Systems and Assemblies 6-46

Metal Buildings • Shear Diaphragms • Shell Roof Structures •

Wall Stud Assemblies • Residential Construction • Composite Construction

6.9 Computer-Aided Design and Direct Strength Method 6-52

Glossary 6-53

References 6-54

Further Reading 6-56

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