Answer:
When defining an imperfection, there are four options available for activating the precamber.
- Always : The precamber is always taken into account.
- EN 1993-1-1 (5.8): The precamber is only taken into account if the slenderness ratio is greater than in Formula (5.8) of the standard EN 1993‑1‑1 (see Image 01).
- DIN 18800 (207): For calculations of existing buildings, this option has been left in the program according to the withdrawn standard DIN 18800.
- Manually: Here, you can specify a value for the member coefficient ε0. The member coefficient is determined according to the formula in Image 02.
The attached example video shows that the limit slenderness is not exceeded for the middle column. No imperfection is applied. The bending moment Mz is zero.
