Question:
For the design, I can only select the surrounding reinforcement for a rectangular cross-section. Why?
Answer:
Once circular cross-sections are available in the structure, they can only be designed with the surrounding reinforcement (Image 01). The reason for this is the fact that there is no "top" and "bottom" for the circular cross-section.
In RF-CONCRETE Members, you can only define one reinforcement layout for each reinforcement group. If the circular cross-section and the rectangular cross-section are designed together, the surrounding reinforcement can only be used for all cross-sections.
To circumvent this restriction, it would be necessary to define an additional or a separate reinforcement group (Image 02).