Question:
Why do I get message 28) in RF‑CONCRETE Members saying that I have to make a "calculation without second order effect" with the internal forces according to the geometrically linear analysis?
Answer:
RF-CONCRETE Columns determines the equivalent moment M-0e from the moment M-02 at the column head and M-01 at the column base according to EN 1992‑1‑1, 5.8.8.2 (2), and performs the design according to the model column method with this equivalent moment M-0e.
However, it is possible that, for example, a numerically larger required reinforcement area would result purely from the cross-section design with the moment M-01 at the column head.
To ensure this, message 28) is displayed, according to which the user should perform a standard design with the internal forces according to the linear static analysis. To do this, simply open the RF‑CONCRETE Members add-on module and perform pure design of the internal forces according to the linear static analysis for the member designed in RF‑CONCRETE Columns.
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