Hi All,
I have done 2 similar staad model in the attached file. All loads, structure size are same, but the change is only in bracing size. i.e. one with single angle 120x120x8 & other with double angle 120x120x8 back to back and assigned all required parameters.
But single angle is passing & double with higher cross section is showing fails. Please rectify.
INPUT FILE
STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 12-Jun-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 0 3 0; 3 5 0 0; 4 5 3 0; 5 0 0 5; 6 0 3 5; 7 5 0 5; 8 5 3 5;
MEMBER INCIDENCES
1 1 2; 2 3 4; 3 2 4; 4 2 3; 5 1 4; 6 5 6; 7 7 8; 8 6 8; 9 6 7; 10 5 8;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.05e+008
POISSON 0.3
DENSITY 76.8195
ALPHA 1.2e-005
DAMP 0.03
TYPE STEEL
STRENGTH FY 253200 FU 407800 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY BRITISH
1 TO 3 6 TO 8 TABLE ST UB305X127X37
4 5 TABLE ST UA120x120x8
9 10 TABLE SD UA120x120x8 SP 0.01
CONSTANTS
BETA 90 MEMB 1 2 6 7
BETA 45 MEMB 4 5
MATERIAL STEEL ALL
MEMBER TRUSS
4 5 9 10
MEMBER RELEASE
3 8 START MY MZ
3 8 END MY MZ
SUPPORTS
1 3 5 7 FIXED
LOAD 1 LOADTYPE None TITLE LOAD CASE 1
JOINT LOAD
2 6 FX 15
PERFORM ANALYSIS
PARAMETER 1
CODE BS5950
SGR 0 ALL
MAIN 1 MEMB 1 2 6 7
MAIN 2 MEMB 3 TO 5 8 TO 10
KY 0.9 MEMB 4 5 9 10
KZ 0.9 MEMB 4 5 9 10
TRACK 0 ALL
RATIO 1 ALL
CHECK CODE ALL
FINISH
Thanks & regards
Raghuveer