FAQ 004872 | The RF‑CONCRETE Columns add-on module cannot determine any sufficient reinforcement. However, the columns can be easily designed in a comparative calculation. Can you help us?

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Question

The RF‑CONCRETE Columns add-on module cannot determine any sufficient reinforcement. However, the columns can be easily designed in a comparative calculation. Can you help us?

Answer

First, you should set the reinforcement layout to "Uniformly surrounding" in the Reinforcement tab in Window 1.4.


Then, open one of the result windows to compare the results from RF‑CONCRETE Columns and the comparative calculation (for example, 3.1 Required Reinforcement by Cross-Section). There you can check the location where the calculation deviates or where there are serious differences in the results.

The first point to check would be the determination of internal forces according to the second-order analysis. These internal forces are ultimately applied for the cross-section design and may lead to different amounts of reinforcement.


With this procedure, you can compare the results step by step and, if necessary, identify different calculation methods.

Furthermore, it should be checked in which way the stability analysis was performed in the comparative calculation. RF‑CONCRETE Columns designs columns with the nominal curvature method according to EN 1992‑1‑1. If the comparative calculation was performed with a general nonlinear calculation, it is possible that the different results can be linked to the method of calculation.

Furthermore, it should be noted that the nominal curvature method for columns in usual building construction with the slenderness λ ≤ 70 gives relatively good results. In the case of greater slenderness, however, this method becomes inefficient relatively quickly.

Keywords

Dlubal FAQ Nominal curvature method Comparative calculation Column Reinforcement Slenderness Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal

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  • Updated 02/18/2021

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