Structural Steel Column vs Structural Steel Beam: What’s the Difference?

Structural steel beams , known as Universal Beams (UBs), and columns, known as Universal Columns (UCs), are often confused due to their similar structural steel profiles and almost identical appearance. The main difference is not necessarily what they look like, but how they are used within a structure.

A structural steel column and a structural steel beam often work together, but they do different jobs. In a typical steel frame, structural steel beams run horizontally and carry loads across a span, while structural steel columns provide vertical support and transfer those loads down towards the foundations. From an engineering point of view, beams are primarily designed to resist bending, while columns mainly resist compression and must also be checked against buckling and other forces. 

Understanding the difference between a beam and a column, and knowing that the terms do not always refer to a particular steel profile, can make ordering, specifying and installing structural steel much easier. Here is what you need to know before choosing, cutting or installing either type.

Structural steel columns and beams explained

A structural steel frame commonly consists of vertical columns supporting horizontal beams. Together, they create a load path that carries the weight of floors, roofs, and other parts of the structure safely to its supports and foundations. 

Universal beams, also called I-beams or H-beams have a straight vertical web (the middle section) and wider horizontal flanges (or protruded ridges) on the top and bottom, forming an I or H shape in the cross-section. A structural steel beam normally spans between supports and needs to carry loads over a distance without excessive bending or deflection. Loads from a floor, roof, wall or other part of the building act on the beam, creating bending and shear forces.

Structural steel beams are commonly used because their I-shaped profile places much of the steel in the top and bottom flanges, which play a major role in resisting bending while the web contributes strongly to shear resistance. Increasing flange size or section depth can increase rigidity, although the correct section must always be determined from the actual design requirements rather than appearance alone. 

This is why a UB is normally deeper than it is wide. It puts material where it is useful for carrying loads across a span.

A structural steel column, by comparison, normally stands vertically. Its main job is to carry compression forces from beams and other structural elements above it. Columns must also resist the possibility of buckling, which means their capacity depends on more than simply how much steel is in the section. Length, restraint, loading and connection details all matter. 

Because a structural steel column normally carries compression along its length, it needs sufficient capacity and stiffness to resist both direct compression and instability. As columns become longer or less effectively restrained, buckling becomes an increasingly important design consideration. 

UCs are generally stockier than UBs, with a relatively wide flange in relation to their depth. This geometry makes UCs well suited to axial loads and other situations where strength and stiffness are required in more than one direction. They are widely used as building columns, support posts and other heavily loaded structural members. 

A UC is not limited to vertical work, however. UCs can also be engineered for use as beams, including situations where a shallower section is useful because headroom is restricted.

Structural steel column vs beam: key differences at a glance

Both UBs and UCs are standard hot-rolled structural sections. AS/NZS 3679.1 sets requirements for the production and supply of hot-rolled structural steel bars and sections, while AS 4100 sets minimum requirements for the design and engineering aspects of steel structures.

The simplest way to understand the difference is to look at what each member is expected to do.

These distinctions reflect typical structural use rather than an absolute rule. Australian steel design resources recognise both Universal Beams and Universal Columns as structural open sections with different geometric and capacity properties, and a designer may select a section according to the actual forces, restraints and space available.

Choosing the right structural steel section for your project

It can be tempting to choose a structural component based on a familiar size or simply move up to something that looks heavier. For structural work, that is not a reliable approach.

The right structural steel beam depends on factors including the span, the magnitude and position of loads, how the beam is supported, lateral restraint, acceptable deflection and the connections at each end. 

The right structural steel column depends on axial load, height, effective length, restraint, bending forces and how it connects to the structure above and below. 

Australian structural design requirements account for member capacity, connections, fabrication and erection rather than section size alone. 

For that reason, always work from engineering drawings or a specification prepared for the project when the steel forms part of a load-bearing structure. Edcon Steel also recommends confirming load and section requirements with a suitably qualified engineer or builder before purchasing critical structural members.

Edcon’s range of structural steel beams and columns

Edcon Steel stocks structural steel beams and columns, including Universal Beams, Universal Columns, Parallel Flange Channels (PFC), angles, RHS, SHS and CHS, alongside a much broader range of steel, metals, fasteners, tools and accessories.

Both trade customers and DIY buyers can order structural steel cut to size, reducing unnecessary material, additional cutting and preparation on site. 

For structural work, start with the approved design or engineering specification, confirm the exact section and length, and plan connections, finish, handling and delivery before placing your order. That approach helps avoid costly changes and makes installation far smoother. 

Important Safety & Specification Disclaimer

This article is intended as a general guide only and should not be relied upon as engineering, design, safety or compliance advice. Steel hollow section product requirements can vary significantly depending on the application, loads, environment and installation method, so always check relevant Australian Standards, building codes and workplace safety requirements, and consult a qualified engineer, builder or other appropriate professional where required before specifying, fabricating or installing these products.