A friend of mine requested me to check his hand written calculations of moment distribution
of a simple 2 storey building with 2 spans. Since I am not a professional structural engineer,
I had to recollect basics by referring some text books, and found a suitable example.
The exercise was completed in EXCEL, using substitute frame analysis method.

Then I thought why not try SMath Studio also, but could not find an example.
Attached is the outcome of my attempt. It is only a basic approach.
Cheers!

MacGinley and Choo_Ex_13.1_TO_FORUM.sm (419.49 KiB) downloaded 829 time(s).
MacGinley and Choo_Ex_13.1_TO_FORUM.pdf (743.17 KiB) downloaded 526 time(s).

Moment Distribution Revisited.
A different method using a While Loop for any threshold value.
Sufficient explanatory notes added.

Cheers!

MacGinley and Choo_Ex_13.1_TO_FORUM_New.sm (354.35 KiB) downloaded 808 time(s).

MacGinley and Choo_Ex_13.1_TO_FORUM_New.pdf (731.59 KiB) downloaded 436 time(s).