RE: Eccentrically Compressed I-beam in SNiP II-23-81*

Also there additional comment to BETA In table 10 SNiP II-23-81*

LaY=127,5.
LaC=3,14*SQRT(E/Ry)=3,14*SQRT(206000/240000)=92.

F.(9) SNiP: FIC=1,47-13*240000/206000-(0,371-27,3*240000/206000)*3,14+(0,0275-5,53*240000/206000)*3,14^2=0,597.
FIY=0,378. (See CHANGE in example below).

If LaY>LaC:
BETA=SQRT ( FIC / FIY)=SQRT(0,597/0,378)=1,257.
In STAAD BETA=1.

BETA is wrong.

ver. 20.07.11.45.
STAAD SPACE
START JOB INFORMATION
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 0 6 0;
MEMBER INCIDENCES
1 1 2;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.05e+008
POISSON 0.3
DENSITY 76.8195
ALPHA 1.2e-005
DAMP 0.03
END DEFINE MATERIAL
MEMBER PROPERTY RUSSIAN STOASCHM
1 TABLE ST SH30-1
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 FIXED
2 FIXED BUT FX FY MX MY MZ
LOAD 1 LOADTYPE None TITLE LOAD CASE 1
JOINT LOAD
2 FX 10 FY -450
PERFORM ANALYSIS
PARAMETER 1
CODE RUSSIAN 1990
CMN 9 ALL
KY 1 ALL
KZ 2 ALL
SGR 2 ALL
TRACK 2 ALL
CHECK CODE ALL

CHANGE
*For FIY
LOAD 2 LOADTYPE None TITLE LOAD CASE 1
JOINT LOAD
2 FY -450
PERFORM ANALYSIS
PARAMETER 2
CODE RUSSIAN 1990
CMN 9 ALL
KY 1 ALL
KZ 2 ALL
SGR 2 ALL
TRACK 2 ALL
CHECK CODE ALL
FINISH