We are about half way through having an extension added to our home. A lot of the project has involved structural work and some pretty heavy steel work.
I employed a structural engineer to do all of the calculations and specify the steel beams that are ultimately going to support the structure. The scary part of all of this is that human error happens, and on 2 of the 3 areas that needed the structural engineers attention, mistakes were made (i.e. supporting structural beams on non load bearing stud wall).
Luckily I was able to catch this, and we were able to rectify the situation BEFORE any work was carried out.
Below is a picture of the major structural work. We knocked out a corner of the bottom floor, and needed to support our upstairs neighbours. From the image below, you can see the opening in the walls, and pretty much the full extent of the steels.
This area of the project was the highest risk, and because of this, I ran some of my own calculations in Inventor using the FEA environment.
My Stress studies showed that the maximum Von Mises stress was well within the yield for the material used. The main area of interest was actually the deflection, as the larger of the 2 beams is 5.5 meters (18 feet) long.
The maximum deflection result was around 1mm, which I was quite happy with!
Below is an update photo, taken roughly 9 months later, as you can see, the steels have been covered over with plasterboard, and the structure is still standing!