I think about doing that (writing my own)but it's such a small part of what I do that it's not worth the time to generate them--I do something like this one or two times a year. He does a great job with the spreadsheets it just seems like every year or so I get jammed up between a license glitch...
I've been using Li's Engineering-International spreadsheets for small peripheral concrete structural design; mostly, footings, small retaining walls, and box culverts. The stuff works fine and the hand checks pass, but I am sick to death of dealing with the licensing issues with the...
