Can someone tell me the error in the following Staad code

[cgstrucg]

For background - smaller 3.5 ft WT member are supposed to be cantilever that's why only My released.

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 04-Apr-18
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 1.67 0 0; 3 19.66 0 0; 4 21.33 0 0; 5 1.67 -6.5 0; 6 19.66 -6.5 0;
7 0.29 0 0; 8 5.33 0 0; 9 10.67 0 0; 10 16 0 0; 11 21.04 0 0; 12 0.29 0 3.67;
13 0.29 0 -3.67; 14 5.33 0 3.67; 15 5.33 0 -3.67; 16 10.67 0 3.67;
17 10.67 0 -3.67; 18 16 0 3.67; 19 16 0 -3.67; 20 21.04 0 3.67;
21 21.04 0 -3.67;
MEMBER INCIDENCES
1 1 7; 2 2 5; 3 3 6; 4 7 12; 5 8 14; 6 9 16; 7 10 18; 8 11 20; 9 7 13; 10 8 15;
11 9 17; 12 10 19; 13 11 21; 14 2 8; 15 3 11; 16 7 2; 17 8 9; 18 9 10; 19 10 3;
20 11 4; 21 12 14; 22 14 16; 23 16 18; 24 18 20; 25 13 15; 26 15 17; 27 17 19;
28 19 21;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.176e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 5184 FU 8352 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 14 TO 20 TABLE ST W10X33
2 3 TABLE ST W8X35
MEMBER PROPERTY AMERICAN
4 TO 13 PRIS YD 0.6675 ZD 0.5833 YB 0.6254 ZB 0.0254
MEMBER PROPERTY AMERICAN
21 TO 28 TABLE ST HSST4X2X0.375
CONSTANTS
BETA 90 MEMB 2 3
MATERIAL STEEL ALL
SUPPORTS
5 6 FIXED
MEMBER RELEASE
4 TO 13 START MY
21 TO 28 START MY MZ
21 TO 28 END MY MZ
LOAD 1 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1
MEMBER LOAD
*Load of Channel
21 TO 28 UNI GY -0.02
*10psf Load of deck plus misc on trib 5.34
5 TO 7 10 TO 12 UNI GY -0.0534
*10psf Load of deck plus misc on trib 2.7
4 8 9 13 UNI GY -0.027
PERFORM ANALYSIS
FINISH

 

[dozer]

Your model will be unstable in certain load conditions. You essentially have a collection of 4 bar links. For gravity only loads it will work, you can ignore the warning. Better yet, get rid of "4 TO 13 START MY". You will get almost identical results and no warning. You say you released MY because they are cantilevered. That makes no sense. You should not release it at all where they tie into that main center beam.

 

[phanikrishnabadipati]

Instead of doing My release alternately provide light braces for stability. As connection cost will be more.

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 04-Apr-18
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 1.67 0 0; 3 19.66 0 0; 4 21.33 0 0; 5 1.67 -6.5 0; 6 19.66 -6.5 0;
7 0.29 0 0; 8 5.33 0 0; 9 10.67 0 0; 10 16 0 0; 11 21.04 0 0; 12 0.29 0 3.67;
13 0.29 0 -3.67; 14 5.33 0 3.67; 15 5.33 0 -3.67; 16 10.67 0 3.67;
17 10.67 0 -3.67; 18 16 0 3.67; 19 16 0 -3.67; 20 21.04 0 3.67;
21 21.04 0 -3.67;
MEMBER INCIDENCES
1 1 7; 2 2 5; 3 3 6; 4 7 12; 5 8 14; 6 9 16; 7 10 18; 8 11 20; 9 7 13; 10 8 15;
11 9 17; 12 10 19; 13 11 21; 14 2 8; 15 3 11; 16 7 2; 17 8 9; 18 9 10; 19 10 3;
20 11 4; 21 12 14; 22 14 16; 23 16 18; 24 18 20; 25 13 15; 26 15 17; 27 17 19;
28 19 21; 29 19 11; 30 18 11;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.176e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 5184 FU 8352 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 14 TO 20 TABLE ST W10X33
2 3 TABLE ST W8X35
MEMBER PROPERTY AMERICAN
4 TO 13 PRIS YD 0.6675 ZD 0.5833 YB 0.6254 ZB 0.0254
MEMBER PROPERTY AMERICAN
21 TO 28 TABLE ST HSST4X2X0.375
29 30 TABLE ST L20202
CONSTANTS
BETA 90 MEMB 2 3
MATERIAL STEEL ALL
SUPPORTS
5 6 FIXED
MEMBER RELEASE
4 TO 13 START MY
21 TO 30 START MY MZ
21 TO 30 END MY MZ
LOAD 1 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1
MEMBER LOAD
*Load of Channel
21 TO 28 UNI GY -0.02
*10psf Load of deck plus misc on trib 5.34
5 TO 7 10 TO 12 UNI GY -0.0534
*10psf Load of deck plus misc on trib 2.7
4 8 9 13 UNI GY -0.027
PERFORM ANALYSIS
FINISH