How to determine the equivalent characteristics of a steel beam supporting a concrete floor?

Steel beams supporting a concrete slab are quite common in building practice.

Yet, one might need to determine the equivalent characteristics of the whole system (for quick assessment of dynamic behaviour for example).

This can be achieved manually or with a section editor program.

Let’s consider the system below:

The distance between the centres of gravity is 14cm + 4cm = 18cm:

Modelling in Advance Design

In Advance Design, this result could easily be achieved by using the Section Editor:

First, a rectangular contour is introduced, with concrete material, to account for the slab:

Then, the HEB280 profile is called from the library and positioned right below the slab:

In the calculation settings, we select the intended material for the equivalent member:

Learn more about Advance Design!


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