I have a question. In SNiP II-23-81* F.(57) table 10 ALPHA=0,65+0,05mx. But in STAAD ALPHA=0,55+0,05mx.
Thus mx=1,07, ALPHA=0,65+0,05*1,07= 0,70. C=1/(1+0,70*1,07)=0,57.
F.(56): 1300 / (0,57*0,63*1,42E-02) = 255 MPa > 245MPa. Member FAIL.
In STAAD: ALPHA=0,55+0,05*1,07= 0,6. C=0,61. F.(56) 235 MPa. Member PASS.
ALPHA is wrong.
ver. 20.07.11.50.
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
1 TABLE ST SH1-50
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 40 FY -1300
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
FINISH