Hi,
I'm trying to solve a simply buckling analysis (see input below). STAAD seems to only calculate the flexural buckling modes and not the torsional buckling modes.
Is there a command/parameter I'm missing to enable STAAD to calculate the torsional buckling factor
STAAD SPACEUNIT MMS NEWTONJOINT COORDINATES1 0.000 0.000 0.0002 0.000 1250.000 0.0003 0.000 2500.000 0.0004 0.000 3750.000 0.0005 0.000 5000.000 0.000MEMBER INCIDENCES1 1 22 2 33 3 44 4 5START USER TABLETABLE 1UNIT MMS NEWTONWIDE FLANGE300X150X9-6.54533 300 6.5 150 9 69325191 5068953.6875 94330.0162878788 1950 2700ENDMEMBER PROPERTY1 TO 4 UPTABLE 1 300X150X9-6.5SUPPORTS1 FIXED5 FIXED BUT FYDEFINE MATERIAL STARTISOTROPIC MAT1E 205000POISSON 0.3DENSITY 7.6985E-05END DEFINE MATERIALCONSTANTSMATERIAL MAT1 ALLDEFINE REFERENCE LOADSLOAD R1 LOADTYPE Dead TITLE EXTERNAL PRESSUREJOINT LOAD5 FY -10000END DEFINE REFERENCE LOADSLOAD 1 LOADTYPE Dead TITLE EXTERNAL PRESSUREREFERENCE LOADR1 1.0PERFORM BUCKLING ANALYSIS PRINT ALLFINISH
You may try modelling the I-shaped section by meshed plate elements to get the Torsional Buckling Mode.