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Torsion for Dead Load Case

Torsion for Dead Load Case

Torsion for Dead Load Case

(OP)
Hello,
Can someone explain to me why I am seeing Torsion in this STAAD model even for Dead Load? I don't know what's wrong in the model and any help will be appreciated.
Thanks

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 18-Jun-19
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 6.5 0 0; 3 6.5 0 6.5; 4 0 0 6.5; 5 0 12.5 0; 6 0 12.5 6.5;
7 6.5 9.5 0; 8 6.5 9.5 6.5; 9 0 8 0; 10 0 8 6.5; 11 6.5 8 0; 12 6.5 8 6.5;
13 -0.25 0 6.5; 14 -0.25 0 0; 15 6.75 0 0; 16 6.75 0 6.5; 17 0 3 0; 18 0 3 6.5;
19 6.5 3 6.5; 20 6.5 3 0;
MEMBER INCIDENCES
1 1 2; 3 4 3; 5 5 9; 6 6 10; 7 2 20; 8 3 19; 9 5 7; 10 6 8; 11 7 8; 12 5 6;
13 10 18; 14 11 7; 15 12 8; 16 9 10; 17 10 12; 18 11 12; 19 9 11; 20 9 17;
21 14 1; 22 13 4; 23 2 15; 24 3 16; 25 17 1; 26 18 4; 27 17 18; 28 19 12;
29 18 19; 30 20 11; 31 20 19; 32 17 20;
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 3 21 TO 24 TABLE ST W10X22
5 TO 8 13 TO 20 25 TO 32 TABLE ST HSST3X3X0.375
9 TO 12 TABLE ST HSSP1.660X0.14
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
13 TO 16 PINNED
LOAD 1 LOADTYPE Dead TITLE DEAD
SELFWEIGHT Y -1 LIST 1 3 5 TO 8 13 TO 32
MEMBER LOAD
16 TO 19 27 29 31 32 UNI GY -0.01625
LOAD 2 LOADTYPE Snow TITLE SNOW SLOPE
JOINT LOAD
5 TO 8 FY -0.2
LOAD 3 LOADTYPE Ice TITLE ICE
JOINT LOAD
5 TO 8 FY -0.152
LOAD 4 LOADTYPE Wind TITLE WINDX+
MEMBER LOAD
5 6 13 16 20 25 TO 27 UNI GX 0.01
1 3 UNI GX 0.21
1 3 UMOM GZ -1.12
LOAD 5 LOADTYPE Wind TITLE WINDX-
MEMBER LOAD
7 8 14 15 18 28 30 31 UNI GX -0.01
1 3 UNI GX -0.21
1 3 UMOM GZ 1.12
LOAD 6 LOADTYPE Wind TITLE WINDZ+
MEMBER LOAD
5 7 14 19 20 25 30 32 UNI GZ 0.01
1 3 UNI GZ 0.22
1 3 UMOM GX 1.21
LOAD 7 LOADTYPE Wind TITLE WINDZ-
MEMBER LOAD
6 8 13 15 17 26 28 29 UNI GZ -0.01
1 3 UNI GZ -0.22
1 3 UMOM GX -1.21
LOAD COMB 11 1.4D
1 1.4
LOAD COMB 12 1.2D+0.5S
1 1.2 3 0.5
LOAD COMB 13 1.2D+1.6S+0.8WX+
1 1.2 2 1.6 4 0.8
LOAD COMB 14 1.2D+1.6S+0.8WX-
1 1.2 2 1.6 5 0.8
LOAD COMB 15 1.2D+1.6S+0.8WZ+
1 1.2 2 1.6 6 0.8
LOAD COMB 16 1.2D+1.6S+0.8WZ-
1 1.2 2 1.6 7 0.8
LOAD COMB 17 1.2D+1.6WX++0.5S
1 1.2 4 1.6 2 0.5
LOAD COMB 18 1.2D+1.6WX-+0.5S
1 1.2 5 1.6 2 0.5
LOAD COMB 19 1.2D+1.6WZ++0.5S
1 1.2 6 1.6 2 0.5
LOAD COMB 20 1.2D+1.6WZ-+0.5S
1 1.2 7 1.6 2 0.5
LOAD COMB 21 1.2D+0.2S
1 1.2 3 0.2
LOAD COMB 22 0.9D+1.6WX+
1 0.9 4 1.6
LOAD COMB 23 0.9D+1.6WX-
1 0.9 5 1.6
LOAD COMB 24 0.9D+1.6WZ+
1 0.9 6 1.6
LOAD COMB 25 0.9D+1.6WZ-
1 0.9 7 1.6
LOAD COMB 26 0.9D
1 0.9
LOAD COMB 31 1.2D+0.2I+0.5S
1 1.2 3 0.2 2 0.5
LOAD COMB 32 1.2D+I+0.5S
1 1.2 3 1.6 2 0.5
LOAD COMB 33 0.9D+I
1 0.9 3 1.0
LOAD COMB 41 D
1 1.0
LOAD COMB 42 D+S
1 1.0 2 1.0
LOAD COMB 43 D+0.75S
1 1.0 2 0.75
LOAD COMB 44 D+WX+
1 1.0 4 1.0
LOAD COMB 45 D+WX-
1 1.0 5 1.0
LOAD COMB 46 D+WZ+
1 1.0 6 1.0
LOAD COMB 47 D+WZ-
1 1.0 7 1.0
LOAD COMB 48 D+0.75WX++0.75S
1 1.0 4 0.75 2 0.75
LOAD COMB 49 D+0.75WX-+0.75S
1 1.0 5 0.75 2 0.75
LOAD COMB 50 D+0.75WZ++0.75S
1 1.0 6 0.75 2 0.75
LOAD COMB 51 D+0.75WZ-+0.75S
1 1.0 7 0.75 2 0.75
LOAD COMB 52 0.6D+WX+
1 0.6 4 1.0
LOAD COMB 53 0.6D+WX-
1 0.6 5 1.0
LOAD COMB 54 0.6D+WZ+
1 0.6 6 1.0
LOAD COMB 55 0.6D+WZ-
1 0.6 7 1.0
LOAD COMB 56 0.6D
1 0.6
LOAD COMB 61 D+0.7I
1 1.0 3 0.7
LOAD COMB 62 D+0.7I+S
1 1.0 3 0.7 2 1.0
LOAD COMB 63 0.6D+0.7I
1 0.6 3 0.7
PERFORM ANALYSIS
DEFINE ENVELOPE
41 TO 56 61 TO 63 ENVELOPE 1 TYPE SERVICEABILITY
11 TO 26 31 TO 33 ENVELOPE 2 TYPE STRENGTH
END DEFINE ENVELOPE
LOAD LIST ENV 1 2
PARAMETER 1
CODE AISC UNIFIED 2010
METHOD LRFD
FYLD 6624 MEMB 5 TO 8 13 15 TO 20 25 TO 32
FYLD 7200 MEMB 1 3 21 TO 24
FU 8352 MEMB 5 TO 8 13 15 TO 20 25 TO 32
FU 9360 MEMB 1 3 21 TO 24
RATIO 0.8 MEMB 1 3 5 TO 8 13 TO 32
DJ2 1 MEMB 5 20 25
DJ1 5 MEMB 5 20 25
DJ2 4 MEMB 6 13 26
DJ1 6 MEMB 6 13 26
DJ2 3 MEMB 8 15 28
DJ1 8 MEMB 8 15 28
DJ2 2 MEMB 7 14 30
DJ1 7 MEMB 7 14 30
DJ2 16 MEMB 3 22 24
DJ1 13 MEMB 3 22 24
DJ2 15 MEMB 1 21 23
DJ1 14 MEMB 1 21 23
DFF 360 MEMB 1 3 5 TO 8 13 TO 32
LZ 5 MEMB 5 TO 8 13 TO 15 20 25 26 28 30
LY 5 MEMB 5 TO 8 13 TO 15 20 25 26 28 30
UNT 0 MEMB 9 TO 12
CHECK CODE MEMB 1 3 5 TO 8 13 TO 32
FINISH

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