Result error in Staad 20.07.11.50

Question

I am analyzing a small equipment platform using Staad build 20.07.11.50. I have built in T-section that fails and I am wondering why it failed. 
 I tried running it in an old version of Staad build 20.07.4.12 (Yes, we still have this) and the T-section column is fine. 
 Can someone give me a clear answer on this one? I have investigated it already myself. If there's an error in the Staad analysis, this should be corrected. 
 There seems to be an error when the built-in member is under tension. Thanks 
 Staad input: 
 
 STAAD SPACE START JOB INFORMATION ENGINEER DATE 24-Aug-16 END JOB INFORMATION INPUT WIDTH 79 UNIT METER KN JOINT COORDINATES 1 0 0 0; 2 2.1 0 0; 3 0 0 -3.5; 4 2.1 0 -2.6; 6 0.813 0 -3.5; 7 0.813 0 -2.6; 8 1.2 0 0; 9 0.4 0 0; 10 0 0 -0.7; 11 0 0 -2.2; 12 0.4 0 -1.1; 13 0.4 0 -2.2; 14 1.2 0 -1.1; 15 1.6 0 -1.1; 16 1.6 0 -2.2; 17 2.1 0 -1.1; 18 1.6 0 -2.6; 19 0 0 -3.35; 20 0.813 0 -2.2; 21 0.4 0 -1.65; 22 1.6 0 -1.65; 23 1.2 0 -2.2; 25 0.95 0 -2.2; 26 1 0 -1.1; 27 1.2 -0.52 -1.1; 28 1.2 -0.52 -2.2; 29 1.6 -0.56 -1.65; 33 0.15 0 -3.13782; 34 0.15 0 -0.85; 37 0.695252 -0.740162 -2.36656; 38 0.4 -0.425 -1.1; 39 1.2 0 -0.3; 41 1.2 -0.537402 -0.837402; MEMBER INCIDENCES 1 2 8; 2 1 10; 3 2 17; 5 4 18; 6 3 6; 8 7 6; 9 8 9; 10 9 1; 11 10 11; 12 11 19; 13 9 12; 14 12 21; 15 8 39; 16 15 22; 17 17 4; 18 15 17; 19 18 7; 20 16 18; 21 11 13; 22 13 20; 24 12 26; 25 14 15; 26 10 34; 27 19 3; 28 20 25; 29 19 33; 30 21 13; 31 22 16; 32 23 16; 35 21 25; 36 25 23; 37 26 14; 38 26 22; 39 28 23; 40 27 14; 41 29 22; 45 33 20; 47 34 12; 49 37 33; 50 38 34; 51 39 14; 53 41 39; START GROUP DEFINITION MEMBER FLOOR _A 1 9 10 GEOMETRY END GROUP DEFINITION START USER TABLE TABLE 1 UNIT METER KN TEE T150X90X10 0.0024 0.09 0.15 0.01 0.01 2.02625e-006 2.82e-006 7.48652e-008 0.07 - 0.0009 0.0015 END DEFINE MATERIAL START ISOTROPIC STEEL E 2.05e+008 POISSON 0.3 DENSITY 76.8195 ALPHA 1.2e-005 DAMP 0.03 ISOTROPIC DUMMY E 2.05e+008 POISSON 0.3 DENSITY 0 ALPHA 1.2e-005 DAMP 0.03 END DEFINE MATERIAL MEMBER PROPERTY KOREAN 1 TO 3 5 6 8 TO 22 24 TO 32 35 TO 38 45 47 51 TABLE ST C200X90X8/14 49 50 53 TABLE ST L90X10 MEMBER PROPERTY KOREAN 39 TO 41 UPTABLE 1 T150X90X10 **************************************************** CONSTANTS BETA 180 MEMB 3 5 8 15 TO 17 19 TO 22 28 31 32 36 38 51 BETA 45 MEMB 49 50 53 BETA 90 MEMB 39 BETA 270 MEMB 40 MATERIAL STEEL ALL SUPPORTS 27 TO 29 FIXED 37 38 41 PINNED MEMBER RELEASE 49 50 53 END MY MZ 39 TO 41 END FZ MY MZ LOAD 1 SELF WEIGHT SELFWEIGHT Y -1.1 * LOAD 2 GRATING/FLOORINGS MEMBER LOAD 2 8 11 12 14 19 27 28 30 32 35 36 38 UNI GY -0.1 13 UNI GY -0.3 15 51 UNI GY -0.43 3 UNI GY -0.23 16 17 20 31 UNI GY -0.13 29 45 UNI GY -0.1 * LOAD 3 HANDRAILS MEMBER LOAD 1 TO 3 5 6 9 TO 12 17 27 UNI GY -0.15 * LOAD 4 LOADTYPE None TITLE LADDER LOAD MEMBER LOAD 19 CON GY -3 * LOAD 5 LIVE1 MEMBER LOAD 2 8 11 12 14 19 27 28 30 32 35 36 38 UNI GY -0.96 13 UNI GY -2.88 15 51 UNI GY -4.08 3 UNI GY -2.16 16 17 20 31 UNI GY -1.2 29 45 UNI GY -0.96 * LOAD 6 LIVE2 JOINT LOAD 2 FY -4.5 * LOAD 7 OPE * LOAD 8 TEST * LOAD 100 TOTAL DEAD LOAD REPEAT LOAD 1 1.1 2 1.1 3 1.1 4 1.0 7 1.0 * LOAD 11 WIND LOAD +X MEMBER LOAD 2 11 12 27 UNI GX 0.722 41 UNI GX 0.541 39 40 49 50 53 UNI GX 0.325 * LOAD 12 WIND LOAD +Z MEMBER LOAD 5 6 19 UNI GZ 0.722 39 40 UNI GZ 0.541 41 49 50 53 UNI GZ 0.325 * LOAD 13 WIND LOAD -X MEMBER LOAD 3 8 17 UNI GX -0.722 41 UNI GX -0.541 39 40 49 50 53 UNI GX -0.325 * LOAD 14 WIND LOAD -Z MEMBER LOAD 1 9 10 UNI GZ -0.722 39 40 UNI GZ -0.541 41 49 50 53 UNI GZ -0.325 * LOAD 21 SEISMIC ACTION X NOTIONAL LOAD 100 X 0.061 * LOAD 22 SEISMIC ACTION Z NOTIONAL LOAD 100 Z 0.061 * LOAD 23 SEISMIC ACTION -X NOTIONAL LOAD 100 X -0.061 * LOAD 24 SEISMIC ACTION -Z NOTIONAL LOAD 100 Z -0.061 * ***************** LOAD COMBINATIONS (LRFD) LOAD COMB 101 1.4DL 100 1.4 LOAD COMB 102 1.2DL + 1.6LL1 100 1.2 5 1.6 LOAD COMB 103 1.2DL + 0.5WL+X 100 1.2 11 0.5 LOAD COMB 104 1.2DL + 0.5WL+Z 100 1.2 12 0.5 LOAD COMB 105 1.2DL + 0.5WL-X 100 1.2 13 0.5 LOAD COMB 106 1.2DL + 0.5WL-Z 100 1.2 14 0.5 LOAD COMB 107 1.2DL + 1.0WL+X + 1.0LL1 100 1.2 11 1.0 5 1.0 LOAD COMB 108 1.2DL + 1.0WL+Z + 1.0LL1 100 1.2 12 1.0 5 1.0 LOAD COMB 109 1.2DL + 1.0WL-X + 1.0LL1 100 1.2 13 1.0 5 1.0 LOAD COMB 110 1.2DL + 1.0WL-Z + 1.0LL1 100 1.2 14 1.0 5 1.0 LOAD COMB 111 1.2DL + 1.0SL+X + 1.0LL1 100 1.2 21 1.0 5 1.0 LOAD COMB 112 1.2DL + 1.0SL+Z + 1.0LL1 100 1.2 22 1.0 5 1.0 LOAD COMB 113 1.2DL + 1.0SL-X + 1.0LL1 100 1.2 23 1.0 5 1.0 LOAD COMB 114 1.2DL + 1.0SL-Z + 1.0LL1 100 1.2 24 1.0 5 1.0 LOAD COMB 115 0.9DL + WL+X 100 0.9 11 1.0 LOAD COMB 116 0.9DL + WL+Z 100 0.9 12 1.0 LOAD COMB 117 0.9DL + WL-X 100 0.9 13 1.0 LOAD COMB 118 0.9DL + WL-Z 100 0.9 14 1.0 LOAD COMB 119 0.9DL + 1.0SL+X 100 0.9 21 1.0 LOAD COMB 120 0.9DL + 1.0SL+Z 100 0.9 22 1.0 LOAD COMB 121 0.9DL + 1.0SL-X 100 0.9 23 1.0 LOAD COMB 122 0.9DL + 1.0SL-Z 100 0.9 24 1.0 LOAD COMB 123 1.2DL + 1.6LL2 100 1.2 6 1.6 LOAD COMB 124 1.2DL + 1.0WL+X + 1.0LL2 100 1.2 11 1.0 6 1.0 LOAD COMB 125 1.2DL + 1.0WL+Z + 1.0LL2 100 1.2 12 1.0 6 1.0 LOAD COMB 126 1.2DL + 1.0WL-X + 1.0LL2 100 1.2 13 1.0 6 1.0 LOAD COMB 127 1.2DL + 1.0WL-Z + 1.0LL2 100 1.2 14 1.0 6 1.0 LOAD COMB 128 1.2DL + 1.0SL+X + 1.0LL2 100 1.2 21 1.0 6 1.0 LOAD COMB 129 1.2DL + 1.0SL+Z + 1.0LL2 100 1.2 22 1.0 6 1.0 LOAD COMB 130 1.2DL + 1.0SL-X + 1.0LL2 100 1.2 23 1.0 6 1.0 LOAD COMB 131 1.2DL + 1.0SL-Z + 1.0LL2 100 1.2 24 1.0 6 1.0 LOAD COMB 132 1.4DL + 1.4TL 100 1.4 8 1.4 LOAD COMB 200 DL 100 1.0 LOAD COMB 201 DL + LL1 100 1.0 5 1.0 LOAD COMB 202 DL + 0.6WL+X 100 1.0 11 0.6 LOAD COMB 203 DL + 0.6WL+Z 100 1.0 12 0.6 LOAD COMB 204 DL + 0.6WL-X 100 1.0 13 0.6 LOAD COMB 205 DL + 0.6WL-Z 100 1.0 14 0.6 LOAD COMB 206 DL + 0.7SL+X 100 1.0 21 0.7 LOAD COMB 207 DL + 0.7SL+Z 100 1.0 22 0.7 LOAD COMB 208 DL + 0.7SL-X 100 1.0 23 0.7 LOAD COMB 209 DL + 0.7SL-Z 100 1.0 24 0.7 LOAD COMB 210 DL + 0.75LL1 + 0.45WL+X 100 1.0 5 0.75 11 0.45 LOAD COMB 211 DL + 0.75LL1 + 0.45WL+Z 100 1.0 5 0.75 12 0.45 LOAD COMB 212 DL + 0.75LL1 + 0.45WL-X 100 1.0 5 0.75 13 0.45 LOAD COMB 213 DL + 0.75LL1 + 0.45WL-Z 100 1.0 5 0.75 14 0.45 LOAD COMB 214 DL + 0.75LL1 + 0.525SL+X 100 1.0 5 0.75 21 0.525 LOAD COMB 215 DL + 0.75LL1 + 0.525SL+Z 100 1.0 5 0.75 22 0.525 LOAD COMB 216 DL + 0.75LL1 + 0.525SL-X 100 1.0 5 0.75 23 0.525 LOAD COMB 217 DL + 0.75LL1 + 0.525SL-Z 100 1.0 5 0.75 24 0.525 LOAD COMB 218 DL + LL2 100 1.0 6 1.0 LOAD COMB 219 DL + 0.75LL2 + 0.45WL+X 100 1.0 6 0.75 11 0.45 LOAD COMB 220 DL + 0.75LL2 + 0.45WL+Z 100 1.0 6 0.75 12 0.45 LOAD COMB 221 DL + 0.75LL2 + 0.45WL-X 100 1.0 6 0.75 13 0.45 LOAD COMB 222 DL + 0.75LL2 + 0.45WL-Z 100 1.0 6 0.75 14 0.45 LOAD COMB 223 DL + 0.75LL2 + 0.525SL+X 100 1.0 6 0.75 21 0.525 LOAD COMB 224 DL + 0.75LL2 + 0.525SL+Z 100 1.0 6 0.75 22 0.525 LOAD COMB 225 DL + 0.75LL2 + 0.525SL-X 100 1.0 6 0.75 23 0.525 LOAD COMB 226 DL + 0.75LL2 + 0.525SL-Z 100 1.0 6 0.75 24 0.525 LOAD COMB 227 DL + TL 100 1.0 8 1.0 PERFORM ANALYSIS PRINT STATICS CHECK DEFINE ENVELOP 101 TO 131 ENVELOP 1 TYPE STRESS 200 TO 226 ENVELOP 2 TYPE SERVICEABILITY END DEFINE ENVELOP LOAD LIST 101 TO 131 ** PARAMETER 1 CODE AISC UNIFIED METHOD LRFD FYLD 248000 MEMB 1 TO 3 5 6 8 TO 22 24 TO 32 35 TO 38 45 47 49 TO 51 53 FU 400000 MEMB 1 TO 3 5 6 8 TO 22 24 TO 32 35 TO 38 45 47 49 TO 51 53 FYLD 335000 MEMB 39 TO 41 FU 510000 MEMB 39 TO 41 * CHECK CODE ALL FINISH

Sye · Accepted Answer

Yes we did find an issue with design of Tee sections which was resulting in underestimation of it's capacity. That has been rectified in version 20.07.11.70. I would suggest that you download the latest 20.07.11.82 and the issue should not be there anymore. I checked your model with 20.07.11.82 and all the members passed the code check.