STAAD calculation vs hand calculation difference LRFD

Hello,

I am comparing results, STAAD vs hand calculation.

A pipe support, 700cm high, loaded with 2500kg earthquake load.

Please find attached pdf with hand calc. and staad file below.

In STAAD the utilization ratio is 0.862 while in hand calc. is 1.13.

Please help me to understand where is the error.

Thanks,

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 08-Jun-14
END JOB INFORMATION
INPUT WIDTH 79
UNIT CM KG
JOINT COORDINATES
1 0 0 0; 2 0 700 0;
MEMBER INCIDENCES
1 1 2;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.09042e+006
POISSON 0.3
DENSITY 0.00783341
ALPHA 1.2e-005
DAMP 0.03
TYPE STEEL
STRENGTH FY 2581.92 FU 4158.4 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TABLE ST PIPE OD 32.385 ID 30.48
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 FIXED
LOAD 1 LOADTYPE Seismic TITLE EX
JOINT LOAD
2 FX 2500
PERFORM ANALYSIS PRINT ALL
PARAMETER 1
CODE LRFD
FYLD 2396 ALL
TRACK 2 ALL
CHECK CODE ALL
FINISH