As of version 2024.f, CYPECAD generates the new "Consideration of second-order effects" report, which analyses whether P-Delta effects are to be taken into account in the analysis.
For this purpose, the stability coefficient or sensitivity coefficient (θ) is calculated per floor and per analysis direction for each seismic loadcase.
When the stability coefficient (θ) is lower than the minimum limit value (θmin), second-order effects can be neglected.
If the coefficient θ is between the minimum and maximum limit values set, θmin < θ ≤ θmax, second-order effects must be considered.
This can be simplified by considering the P-Delta effects, amplifying the effects of the seismic action. If the coefficient θ is higher than the maximum limit (θmax), the structure is potentially unstable and must be stiffened.
