***WARNING - INSTABILITY AT JOINT 407 DIRECTION = MY

(Please visit the site to view this file)Dear Engineers,

In attached model, there is a warning regarding the instability, can anyone explain to remove that.

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 08-Sep-16
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
71 -3 0 0.03; 72 -3 0.417 0.03; 73 -4.014 0.141 0.03; 360 -3 0 2.004;
361 -3 0.417 2.004; 362 -4.014 0.141 2.004; 369 -3 0 3.978; 370 -3 0.417 3.978;
371 -4.014 0.141 3.978; 378 -3 0 5.952; 379 -3 0.417 5.952;
380 -4.014 0.141 5.952; 387 -3 0 7.926; 388 -3 0.417 7.926;
389 -4.014 0.141 7.926; 399 -3 0.311 0.03; 400 -3 0.311 2.004;
401 -3 0.311 3.978; 402 -3 0.311 5.952; 403 -3 0.311 7.926; 404 -3 0 9.9;
405 -3 0.311 9.9; 406 -3 0.417 9.9; 407 -4.014 0.141 9.9;
MEMBER INCIDENCES
1 72 73; 2 361 362; 3 370 371; 4 379 380; 5 388 389; 6 406 407; 11 399 400;
12 400 401; 13 401 402; 14 402 403; 15 403 405; 29 71 399; 155 360 400;
161 369 401; 167 378 402; 173 387 403; 197 399 72; 198 400 361; 199 401 370;
200 402 379; 201 403 388; 207 404 405; 209 405 406;
DEFINE MATERIAL START
ISOTROPIC CONCRETE
E 2.17185e+007
POISSON 0.17
DENSITY 23.5616
ALPHA 1e-005
DAMP 0.05
TYPE CONCRETE
STRENGTH FCU 27579
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 COLDFORMED INDIAN
29 155 161 167 173 197 TO 201 207 209 TABLE ST 60CS30X2
1 TO 6 TABLE ST 50LU50X2
11 TO 15 TABLE ST 40CU25X2
CONSTANTS
BETA 45 MEMB 1 TO 6
BETA 270 MEMB 29 155 161 167 173 197 TO 201 207 209
MATERIAL STEEL ALL
SUPPORTS
71 73 360 362 369 371 378 380 387 389 404 407 PINNED
MEMBER RELEASE
11 TO 15 START MX MY MZ
11 TO 15 END MX MY MZ
LOAD 1 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1
MEMBER LOAD
1 6 UNI GY -0.11
2 TO 5 UNI GY -0.22
LOAD 2 LOADTYPE Wind TITLE WIND X+
MEMBER LOAD
29 155 161 167 173 197 TO 201 207 209 UNI GX 0.114
1 TO 6 UNI Y -1.25
LOAD 3 LOADTYPE Wind TITLE WIND X-
MEMBER LOAD
29 155 161 167 173 197 TO 201 207 209 UNI GX -0.114
1 TO 6 UNI Y -1.25
LOAD 4 LOADTYPE Wind TITLE WIND Z+
MEMBER LOAD
29 155 161 167 173 197 TO 201 207 209 UNI GZ 0.057
1 TO 6 UNI Y -1.25
LOAD 5 LOADTYPE Wind TITLE WIND Z-
MEMBER LOAD
29 155 161 167 173 197 TO 201 207 209 UNI GZ -0.057
1 TO 6 UNI Y -1.25
LOAD COMB 6 DL+WIND X+
1 1.0 2 1.0
LOAD COMB 8 DL+WIND X-
1 1.0 3 1.0
LOAD COMB 7 DL+WIND Z+
1 1.0 4 1.0
LOAD COMB 9 DL+WIND Z-
1 1.0 5 1.0
PERFORM ANALYSIS
PARAMETER 1
CODE IS801
BEAM 1 ALL
FYLD 250000 ALL
TRACK 2 ALL
LZ 0.417 MEMB 29 155 161 167 173 197 TO 201 207 209
CHECK CODE ALL
FINISH

Thank You,

Regards,

Saikiran.