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Why do I get such a small amount of reinforcement for the upstand beam? The amount of reinforcement for the downstand beams is significantly larger.

Answer

While Member 1 is an upstand beam, Member 2 is a downstand beam. This results in a compression axial force for Member 1, and a tensile force for Member 2.

For the concrete design, a compressed cross-section is more favorable than a tensioned cross-section. For comparison purposes, here are the axial forces of the members:

Image 01 - Results of Axial Force

Now, if you deactivate the axial forces for the design in RF‑CONCRETE Members, the result is a required reinforcement that is affine to the moment distribution:

Image 02 - Deactivating Axial Force

With this setting, you are on the safe side for Member 1, but on the unsafe side for Member 2.

Keywords

Upstand beam Downstand beam Design Amount of reinforcement

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  • Updated 26 February 2021

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