Hi ,
Plz help me to resolve this " instability at joint"
How should I go about rectifying this. And will it affect the design?
Attached staad
STAAD SPACE FRAME
START JOB INFORMATION
ENGINEER DATE 19-Jul-16
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 34.64 0 0; 3 0 6 0; 4 34.64 6 0; 5 17.32 7.732 0;
6 2.28859 6.22886 0; 7 32.355 6.2285 0; 8 19.8076 7.48324 0; 9 14.836 7.4836 0;
MEMBER INCIDENCES
1 1 3; 2 2 4; 3 3 6; 4 5 8; 5 9 6; 6 4 7; 7 8 7; 8 5 9;
UNIT CM KN
MEMBER PROPERTY BRITISH
5 7 TABLE ST UB533X210X122
1 2 TABLE ST UB610X305X149
UNIT METER KN
MEMBER PROPERTY BRITISH
3 4 6 8 TAPERED 0.95 0.012 0.7 0.2 0.016 0.2 0.016
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 2.05e+008
POISSON 0.3
DENSITY 77
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
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 2 PINNED
LOAD 1 DEADLOAD
SELFWEIGHT Y -1
MEMBER LOAD
3 TO 8 UNI GY -1.56
LOAD 2 LIVELOAD
MEMBER LOAD
3 TO 8 UNI GY -3.75
LOAD 3 COLLATERAL LOAD
MEMBER LOAD
3 TO 8 UNI GY -1.25
LOAD 4 WINDLEFT
MEMBER LOAD
1 UNI GX 1.4
3 5 8 UNI Y 5.4
4 6 7 UNI Y 3.4
2 UNI GX 2.9
LOAD 5 WINDRIGHT
MEMBER LOAD
1 UNI GX -2.9
3 5 8 UNI Y 3.4
4 6 7 UNI Y 5.4
2 UNI GX -1.4
LOAD 6 WINDEND
MEMBER LOAD
1 UNI GX -3.9
3 5 8 UNI Y 5.4
4 6 7 UNI Y 5.4
2 UNI GX 3.9
** ASCE 7-05 -2.3.2 LRFD COMBOS
LOAD COMB 7 1.2XDEADLOAD + 1.6XLIVELOAD + 1.2XCOLLATERALLOAD
1 1.2 2 1.6 3 1.2
LOAD COMB 8 1.2XDEADLOAD + 0.5XLIVELOAD + 1.2XCOLLATERALLOAD
1 1.2 2 0.5 3 1.2
LOAD COMB 9 1.2XDEADLOAD +0.5XLIVE LOAD + 1.6XWINDLEFT
1 1.2 2 0.5 4 1.6
LOAD COMB 10 1.2XDEADLOAD +0.5XLIVE LOAD+1.6WINDRIGHT
1 1.2 3 0.5 5 1.6
LOAD COMB 11 1.2XDEADLOAD +0.5XLIVE LOAD +1.6XWINDEND
1 1.2 2 0.5 6 1.6
LOAD COMB 12 0.9XDEADLOAD +1.6XWINDLEFT
1 0.9 4 1.6
LOAD COMB 13 0.9XDEADLOAD + 1.6XWINDRIGHT
1 0.9 5 1.44
LOAD COMB 14 0.9XDEADLOAD +1.6XWINDEND
1 0.9 6 1.6
LOAD COMB 15 1.6XDEADLOAD
1 1.6
PERFORM ANALYSIS
LOAD LIST 7 TO 14
PARAMETER 1
CODE LRFD
FYLD 345000 ALL
LY 1.5 ALL
LZ 6 MEMB 1 2
LZ 34.82 MEMB 3 TO 8
KZ 2 MEMB 1 2
KY 1 ALL
UNB 1.5 ALL
UNT 1.5 ALL
CB 1 ALL
CHECK CODE ALL
STEEL TAKE OFF ALL
*SELECT OPTIMIZED
FINISH