Perform Buckling Analysis tab
Used to instruct STAAD.Pro to perform a buckling analysis.
Refer to TR.37.4 Buckling Analysis for additional information.
Setting  Description  

Iterative method  When this option is selected, the program will perform a PDelta analysis including Kg Stiffening (geometric stiffness of members & plates) due to large & small PDelta effects. If a nonsingular stiffness matrix can be created, then buckling has not occurred. Then the load is increased from the last increment repeatedly until buckling does occur. Then the load is decreased halfway back to the prior increment. This bounds the buckling factor between the last 2 increments. Then STAAD.Pro proceeds to halve the interval until either the change between increments is 0.1% of each other, or the specified number of increments has been exceeded. The resulting factor is reported in the output file. The buckling deformed shape is simply the deformed shape from a static analysis with the near buckling load applied. This could appear more like a crushing, small displacement shape rather than a buckling mode shape. At least 15 iterations are recommended. Buckling will be applied to all primary cases.  
Eigen method  This buckling method may only be used if an Advanced Analysis license is available. When using the Advanced Solver, the corresponding "buckling modes" are included in the output file.  
Print Option  Standard STAAD.Pro analysis print options:
