Classification of Steel Structures are
Truss Systems and Frame Systems
Built-up Members and Structures
- Chord Members in trusses
- In diagonal bracing in bracing systems
- Cable elements in suspension roofs, main cables of suspension bridges and suspenders.
- Columns in buildings
- Chord Members in trusses and diagonal members in end panels of trusses
- Stability is an important consideration in design and behavior of compression members
- Area is generally spread out to maximize Radius of Gyration
- Primarily loaded transverse to the longitudinal axis and resist loading by flexure
- X-sectional area is located as far from the neutral axis as is practical
- Commonly W shapes are used in most cases
- For deeper beams I-shaped sections made by welding plates are commonly used
- For smaller loads and spans open-web joists are commonly used
- Instability due to lateral Torsional Buckling is an important consideration
Open-Web Steel Joist
- Economical & popular for Roof & floor framing.
- Bar joist are supported by bearing walls or steel girders.
- Floor of thin concrete reinforced in both directions with rebars or welded wire fabric.