Classification of Steel Structures

1- Tension Members

2- Compression Members

3- Truss Systems and Frame Systems

4- Built-up Members and Structures

5- Shell Structures

6- Suspension Structures

Tension Members

Primarily occur as

1- Chord Members in trusses

2- In diagonal bracing in bracing systems

3- Cable elements in suspension roofs, main cables of suspension bridges and suspenders.

Compression Members

Primarily Occur as

1- Columns in buildings;

2- Chord Members in trusses and diagonal members in end panels of trusses

3- Stability is an important consideration in the design and behaviour of compression members

4- Area is generally spread out to maximize Radius of Gyration

Beam Members

1- Primarily loaded transverse to the longitudinal axis and resist loading by flexure

2- X-sectional area is located as far from the neutral axis as is practical

3- Commonly W shapes are used in most cases

4- For deeper beams I-shaped sections made by welding plates are commonly used

5- For smaller loads and spans open-web joists are commonly used

6- Instability due to lateral Torsional Buckling is an important consideration

Open-Web Steel Joist

1- Economical & popular for Roof & floor framing.

2- Bar joist are supported by bearing walls or steel girders.

3- Floor of thin concrete reinforced in both directions with rebars or welded wire fabric.

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