[RC] Singly and doubly reinfoced concrete rectangular sections analysis formulas (EN 1992-1-1) [Part 1]

Hello everybody! In all concrete design manuals (EN 1992-1-1) formulas are ready for readers without any deriavation. And formula analsysis are made only for British national annex. But I am interesting in to derive equations for "clean" eurocodes, without any annexes. This will solve any problem with reinforced concrete analysis in future.


In pictures (you can see them below). I derive main formulas for bend rectangular RC section (with tension and compress reinforcing). Now anybody can do analyse file in Excel, MathCad, SmathStudio and etc based on my flowchart (see page 6, 7)
You can also download this papers as pdf - LINK_PDF

P.s.
If you find any mistakes, please, write about it in comments.