In this post I shall provide a introduction to buckling analysis with Standard solver using STAAD.Pro 2007. By including the command PERFORM BUCKLING ANALYSIS, the program will perform a P-Delta analysis including Kg Stiffening (geometric stiffness of members & plates) due to large & small P-Delta effects. If a non-singular 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 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. 15+ iterations are recommended. Buckling will be applied to all primary cases.
The option is activated using the new option in the Analysis/Print dialog thus:-
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| P-Delta analysis with STAAD.Pro |
The results of the Buckling analysis are presented in the output file thus:-
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| P-Delta analysis with STAAD.Pro |
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