I lost this method years ago and now have found it. The routine is on my HP41 Structures Pac (old faithful still working after 32 years)
Perfect for a small program or spreadsheet
J
I see this thread has expired.
I want to work out the load capacity of a pipe that is divided into into 4 equal sections : small dia, larger dia, small dia & large dia.
I have found this MSc Thesis, that looks hopeful.