A few months ago I discovered a mistake in STAADpro brace design according to AISC 360-10 and reported that here in the forum, thanks to STAAD team for the correction and reissuing a new patch (the current one), but unfortunately they didn't mension the impact of correction in their comment upon issuing.
Now I am working in a project to be design according to the Australian code AS4100, I've discovered that STAAD output provide wrong checking compared with hand calculations.
I attached an example here:
STAAD output consider a brace member of HSS4x4x1/4,5m length and subjected to comression (156 kN) pass the code with stress ratio of 0.665. This should fail!!!!!
STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 17-Apr-13
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 5 0 0; 3 0 3 0; 4 5 3 0; 5 0 0 4; 6 5 0 4; 7 0 3 4; 8 5 3 4;
MEMBER INCIDENCES
1 3 4; 2 1 3; 3 2 4; 4 7 8; 5 5 7; 6 6 8; 7 3 7; 8 4 8; 9 5 3; 10 6 4; 11 1 4;
12 5 8;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 1.99947e+008
POISSON 0.3
DENSITY 76.8191
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 248210 FU 399894 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TO 8 TABLE ST W8X40
9 TO 12 TABLE ST TUB40404
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 2 5 6 PINNED
MEMBER TRUSS
9 TO 12
MEMBER RELEASE
1 4 7 8 START MPY 0.99 MPZ 0.99
1 4 7 8 END MPY 0.99 MPZ 0.99
LOAD 1 LOADTYPE None TITLE LOAD CASE 1
JOINT LOAD
3 FZ 125
SELFWEIGHT Y -1
PERFORM ANALYSIS
PARAMETER 1
CODE AUSTRALIAN
FYLD 345000 MEMB 1 TO 8
FYLD 317000 MEMB 9 TO 12
CHECK CODE ALL
FINISH
Please STAAD team, investigate the matter ASAP