Imperfection Analysis – considers the secondary effects of loads acting on members that have an initial curvature (camber) or an initial drift This analysis is used on structures that have members with an Imperfection specification applied to them.This feature requires a license for the Advanced Analysis Engine. This is particularly useful in the analysis of floor systems supporting vibrating equipment. Generate Floor Spectrum – used to request the calculation of floor and/or joint response spectra from time history results.However, this analysis calculates modifications to the stiffness matrix using the τb factors described in AISC 360-05. This analysis is similar to a P-Delta Analysis with the Use Geometric Stiffness (Kg) and Small Delta options selected. This method accounts for the second-order effects resulting from deformation in the structure due to applied loading, imperfections, and reduced bending stiffness of members due to the presence of axial loads. Direct Analysis – performs a Direct Analysis.Cable Analysis – performs a non-linear cable analysis on a structure that contains non-linear cable members.Finally, this analysis includes an option to include the Geometric Stiffness (Kg) matrix, which modifies the member stiffnesses based on the applied loads. There is also an option to include the P-δ (small delta) effect, which considers the effect of applied loads acting on the deformed shape of individual members. This analysis type also has options to specify the number of iterations to be performed or to place a convergence tolerance on the displacements from successive iterations. This type of analysis is generally preferred by most building codes. P-Delta Analysis – performs a second-order elastic analysis that considers the effects of the applied loads acting on the displaced structure (P-Δ effect).Perform Analysis – instructs STAAD to perform a linear elastic (stiffness) analysis. STAAD.Pro offers several analysis methods as noted below:
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