> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/e3d-user-manual/interface/toc175916526/concrete/toc442029138.md).

# RC Member Input

How to enter beams and columns for concrete design with their class, criteria, and cracking factors.

Concrete Design > RC Member Input prompts you with the following dialog.

![](https://560001759-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWNe8U6EBBBdUJHdb2X9G%2Fuploads%2Fgit-blob-9df2ecd4b9952d684690d5585b562b92605ba57b%2FFASTFR~1_img195.png?alt=media)

It allows you to enter beams and columns for concrete design in a spreadsheet. Each element includes the class (“B” for beam, “C” for column), design criteria ID, cracking factor, and exclusion design flag (0 for included, 1 for excluded). The element cracking factor with a value between 0 (fully cracked) and 1 (uncracked) applies to the moments of inertia of member elements. You may not modify the member ID. Design criteria IDs must be valid (defined). Beam and column design criteria dialogs are provided for you to correctly pick and apply proper element class and design criteria to selected members.


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