Reduced results for wall panel with openings supported on a steel beam

[skellyRSA2023]

hi,

I was wondering could somebody give me a an explanation for a result which I have from a wall panel. The wall panel has 3 openings as per the attached pdf. It is supported on a steel beam continuously under the wall panel at its base, the steel beam is then further supported on primary beams either side. I have taken 4 panel cuts along the bottom of the panel for a specific load combination (which is permanent dead load i.e. all vertical dead load acting downwards). the end panel cuts to the piers at each end of the wall (A1 and A4) have given me a downward force (-) and the panel cuts for the two central piers (A2 and A3) have given me an upward force? is this correct and is it to do with the stiffness of the beam compared to the stiffness of the wall i.e. the wall is a lot stiffer/rigid?

As I was trying to take the panel cuts so as to design the beam separately outside RSA so as to get bending moment diagram with loads directly acting down on beam.

Thanks,

Simon.

[skellyRSA2023]

By the way there are three pages in the pdf showing the panel and cut results etc.

[Artur.Kosakowski]

Hi @skellyRSA2023

Leaving aside the doubt of influence of the walls sizes on the deformation of the steel beam you may consider replacing the walls with bar elements (columns) with rigid links connecting their top nodes with bottom edge nodes of the above defined panel within the real size of the columns. In this way you will have an easy to transfer point forces for the outside of RSA beam design.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[skellyRSA2023]

Artur,

To be honest it was more a question whether the stiffness of the support beam beneath effects the reactions, where you have an upward reactions in the middle of the panel? basically is this correct when you have openings in panels like this?

Its easier for me to draw a panel and put openings in it, rather than form columns with rigid links/beams etc. as this would be more time consuming considering the amount of panels I needed the draw.

Rgds,

Simon.