Question:
What is the purpose of the function "Design of longitudinal reinforcement for percentage of utilization" in the setting for nonlinear calculation in RF‑CONCRETE Members? I have selected this option but the system is unstable anyway. Why?
Answer:
This option is only effective if the utilization of 1/γ > 1.000 results in the NL calculation with the existing longitudinal reinforcement (resulting from the statically required reinforcement, linear analysis) or preset basic reinforcement.
If you select this option, the required reinforcement or the basic reinforcement will be increased accordingly to achieve the utilization < 1.00 in the NL calculation (see result window 6.1.1., Column E).
Important Note: If there is a stability problem (message = structural resistance not sufficient, for example, a stability analysis of a column according to the second-order analysis), this option does not help. In this case, it is necessary to specify the reinforcement manually or adjust the structural system / load.