Linear Buckling Analysis - Torsional Buckling Modes

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 SPACE
UNIT MMS NEWTON
JOINT COORDINATES
1 0.000 0.000 0.000
2 0.000 1250.000 0.000
3 0.000 2500.000 0.000
4 0.000 3750.000 0.000
5 0.000 5000.000 0.000
MEMBER INCIDENCES
1 1 2
2 2 3
3 3 4
4 4 5
START USER TABLE
TABLE 1
UNIT MMS NEWTON
WIDE FLANGE
300X150X9-6.5
4533 300 6.5 150 9 69325191 5068953.6875 94330.0162878788 1950 2700
END
MEMBER PROPERTY
1 TO 4 UPTABLE 1 300X150X9-6.5
SUPPORTS
1 FIXED
5 FIXED BUT FY
DEFINE MATERIAL START
ISOTROPIC MAT1
E 205000
POISSON 0.3
DENSITY 7.6985E-05
END DEFINE MATERIAL
CONSTANTS
MATERIAL MAT1 ALL
DEFINE REFERENCE LOADS
LOAD R1 LOADTYPE Dead  TITLE EXTERNAL PRESSURE
JOINT LOAD
5 FY -10000
END DEFINE REFERENCE LOADS
LOAD 1 LOADTYPE Dead TITLE EXTERNAL PRESSURE
REFERENCE LOAD
R1 1.0
PERFORM BUCKLING ANALYSIS PRINT ALL
FINISH

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