Last Updated on February 21, 2026 by Maged kamel
Introduction to Structural Steel.
The item included in this post will be the advantages and disadvantages of structural steel.
The content of the post.
We are going to talk about a new subject: structural steel. We need to discuss several points. The first point is about the advantages and disadvantages of using steel as a construction material.
The second item is the relationship between stress and strain in steel.
The next items will be discussed in the next posts.
The third item is about the different values of Yield stress for steel.
The fourth item concerns steel composition. What are the different steel grades?
The last item is about the different steel shapes and how we can estimate a given steel section. This is the content of the lecture, as shown in the next slide.
Structural steel and its advantages as a construction material.
We begin by discussing the advantages of structural steel. The great strength is the initial benefit.
Given its lightweight nature, steel can support heavier loads. Compared to concrete, steel has a higher unit weight.
For bridges, tall buildings, and constructions built on shoddy foundations, to paraphrase.
That was Steel’s advantage. Its weight is more than that of any other building material.
Consistency is the second benefit. Elasticity is steel’s third benefit. The steel structure’s moment of inertia can be precisely calculated.
The three different steel benefits are displayed in the next slide.
Performance is the fourth benefit of a steel structure. I quote: “Steel frames with proper maintenance will last a lifetime.” Thus, with proper upkeep, steel constructions can last longer.
I quote: “Under certain circumstances, research on some of the more recent steels suggests that.” Painting is not necessary.
The next benefit is that the material has ductility, which allows it to withstand significant deformation under high tensile stresses without failing. After a substantial quantity of elongation, failure will happen.
Disadvantages of structural steel as a construction material.
The first disadvantage is corrosion. Most steels are susceptible to corrosion when freely exposed to air and water and, therefore, should be painted periodically.
Weathering steels are a family of low-carbon steels that contain additional alloying elements in addition to carbon and iron.
These alloying elements give weathering steel greater strength and improved corrosion resistance than typical low-carbon steel grades; however, suitable applications tend to reduce maintenance costs.
The next disadvantage is the cost of fireproofing.
The strength of steel is affected by fire.
I quote that many disastrous fires have occurred in empty buildings, where the only fuel was the building itself. Steel is an excellent heat conductor.
Additional disadvantages of steel.
Non-fireproofed steel members may transmit enough heat from a burning section.
Buckling susceptibility is steel’s next disadvantage.
Two factors are considered for buckling: length and radius of gyration.
One can estimate the member’s slenderness. The slenderness ratio rises as the buckling length decreases and the cross-section shrinks.
By adding bracing to the columns, more steel is added, making the columns stiffer and preventing buckling. Steel’s fatigue is the next drawback.
Steel should not be fatigued, as fatigue reduces its strength. A high number of stress reversals is fatigue.
I quote: “Tenseness contributes to fatigue issues.” Many variations in tensile stress can cause fatigue. Another drawback of steel is its brittle fracture.
This brittle fracture occurs at points of stress concentration.
The PDF for this post can be viewed or downloaded from the following link.
The following post discusses the relationship between stress and strain in steel.
This is a link to a very good reference, Chapter 1 – Introduction–An Overview of the AISC Steel Construction Manual, 14th Edition
This is a link to a very good reference, Chapter 1 – Introduction–An Overview of the AISC Steel Construction Manual, 15th Edition
This is a link to a very good reference, Chapter 1 – Introduction–An Overview of the AISC Steel Construction Manual, 16th Edition