BeginnerTopic 15 of 112Civil & Structural
Structural steel
Strong, ductile material used for frames and bridges.
In depth
Structural steel has high strength (yield 250–460 MPa), ductility and uniform quality. Sections: I, H, channels, angles, hollow sections; plates and built-up members. Advantages: fast construction, recyclable; disadvantages: corrosion, fire and buckling issues.
Key points
- Grades S275, S355
- Hot-rolled vs cold-formed
- Fire protection coatings
ExampleWarehouses and bridges commonly use steel frames.
Structural steel is strong, ductile and fast to erect, which makes it ideal for long spans, tall buildings and industrial structures.
What is Structural steel?
Strong, ductile material used for frames and bridges.
Why is it important to understand structural steel?
Structural steel is strong, ductile and fast to erect, which makes it ideal for long spans, tall buildings and industrial structures.
What makes steel a good structural material?
High strength and stiffness, ductility that gives warning before failure, and the ability to be manufactured to precise shapes.
What are the main concerns with steel?
Corrosion, fire weakening, fatigue under repeated loads and brittle fracture at low temperature must all be addressed.
How is Structural steel used in practice?
Typical applications include designing a steel frame for a multi-storey office, choosing a steel grade for a bridge girder and fabricating a truss for an airport roof.
What should I learn before Structural steel?
Study "Reinforced concrete concept" first (topic 14 of 112 in Civil & Structural). It covers the groundwork this topic builds on.
What are the key points of Structural steel?
Grades S275, S355. Hot-rolled vs cold-formed. Fire protection coatings.
Can you give an example of Structural steel?
Warehouses and bridges commonly use steel frames.
What comes after Structural steel?
The next topic is "Timber and masonry", which builds directly on this one.
How difficult is Structural steel?
It is classed as Beginner in Civil & Structural (topic 15 of 112). It is an entry-level topic. It relies only on basic school mathematics and the ideas introduced earlier in this discipline.