Unit 2179: Comprehensive Steel Structures Design and Construction

1. Introduction to Steel Structures

1.1 Overview of Steel as a Construction Material

• History and evolution of steel structures
• Types of structural steel

1.2 Properties of Steel

• Mechanical properties (strength, ductility, toughness)
• Physical properties (density, thermal conductivity)
• Corrosion resistance and durability

1.3 Advantages of Steel in Construction

• High strength-to-weight ratio
• Speed of construction
• Flexibility and adaptability
• Recyclability

1.4 Common Structural Steel Shapes

• I-beams, channels, angles, tees
• Hollow structural sections (HSS)
• Plates and sheets

2. Load and Resistance Factor Design (LRFD) Method

2.1 Introduction to LRFD

• Purpose and benefits
• Comparison with allowable stress design

2.2 Load Types and Combinations

• Dead loads, live loads, environmental loads
• Load combination factors

2.3 Resistance Factors

• Definition and application
• Material resistance factors

2.4 LRFD Design Process

• Steps for design using LRFD
• Examples of design checks

3. Structural Steel Connections

3.1 Types of Connections

• Bolted connections
• Welded connections
• Riveted connections (historical context)

3.2 Design Considerations

• Load transfer mechanisms
• Connection detailing
• Failure modes

3.3 Bolted Connection Design

• Types of bolts and installation
• Bearing and shear in bolts
• Bolt spacing and edge distances

3.4 Welded Connection Design

• Types of welds
• Weld sizing and inspection
• Common welding defects and remedies

4. Design of Steel Beams

4.1 Beam Types and Applications

• Simply supported, cantilever, continuous beams

4.2 Bending Analysis

• Moment diagrams
• Section modulus and bending stress calculations

4.3 Shear Analysis

• Shear force diagrams
• Shear strength and design

4.4 Deflection Calculations

• Limits and serviceability criteria
• Methods of calculation

4.5 Beam Design Examples

• Step-by-step design using code provisions

5. Design of Steel Columns

5.1 Behavior under Axial Loads

• Axial compression fundamentals
• Slenderness ratio and classification

5.2 Eccentric Loading Effects

• Moment and axial load interaction
• Interaction curves

5.3 Design Principles and Codes

• Buckling modes
• Effective length factors
• Design using relevant standards

5.4 Column Design Examples

• Practical design scenarios

6. Steel Design for Lateral Loads

6.1 Types of Lateral Loads

• Wind loads
• Seismic loads

6.2 Structural Systems for Lateral Resistance

• Bracing systems (cross, K, V-bracing)
• Moment-resisting frames
• Shear walls

6.3 Analysis Methods

• Static and dynamic analysis
• Load path and distribution

6.4 Design Considerations

• Drift limits
• Connection detailing for lateral forces

7. Composite Steel Structures

7.1 Introduction to Composite Construction

• Benefits of combining steel and concrete

7.2 Types of Composite Members

• Composite beams
• Composite columns

7.3 Interaction between Steel and Concrete

• Shear connectors
• Composite action and load transfer

7.4 Design Principles and Examples

• Code requirements
• Sample design calculations

8. Steel Bridge Design

8.1 Overview of Steel Bridges

• Types of steel bridges (girder, truss, arch)
• Components and functions

8.2 Design Considerations

• Loadings specific to bridges
• Fatigue and durability

8.3 Construction Methods

• Fabrication
• Erection techniques
• Quality control

8.4 Case Studies

• Examples of steel bridge projects

9. Steel Structure Stability

9.1 Stability Concepts

• Importance of stability in design

9.2 Buckling Analysis

• Types of buckling (local, global, lateral-torsional)
• Critical load calculations

9.3 Bracing Systems

• Role of bracing in stability
• Types and placement

9.4 Stability Criteria and Checks

• Code requirements
• Design examples

10. Fabrication and Erection of Steel Structures

10.1 Fabrication Processes

• Cutting, drilling, welding, and assembly
• Tolerances and quality control

10.2 Quality Assurance

• Inspection methods
• Non-destructive testing

10.3 Erection Practices

• Safety procedures
• Lifting and handling
• Temporary supports and bracing

10.4 Site Management

• Coordination with other trades
• Scheduling and logistics

Summary

• Recap of key concepts
• Integration of design and construction practices