Pipe - AISC 360-10 Eqn H3-6

Why STAAD does not check Eqn H3-6 (combined torsion, shear and flexure)? Here are design details for one member. Also torsion capacity should be divided by 12 (8.307/12=0.692). I use STAAD.Pro V8i (SELECT series 4) 20.07.09.21

 ALL UNITS ARE - KIP  INCH (UNLESS OTHERWISE NOTED)

  MEMBER NO:     1    CRITICAL RATIO:  0.959(PASS)     LOAD:     1
  LOCATION (ft): 0.00  CONDITION: Sec. F1
  SECTION: PIPS15                  (AISC SECTIONS)

  UNIT: KIP FEET

  STRENGTH CHECKS:
  CRITICAL RATIO:  0.959(PASS)     LOAD CASE:     1  LOCATION (ft): 0.00  CONDITION: Sec. F1
  DESIGN FORCES:   Fx:      0.00(T)    Fy:     0.00      Fz:     -0.22
                   Mx:  -1.99E-01      My:  7.05E-01     Mz:   0.00E+00
 
  SLENDERNESS:   ACTUAL SLENDERNESS RATIO:      43.198  LOAD:     1   LOC.(ft):   0.187
                 ALLOWABLE SLENDERNESS RATIO:  200.000

  MOMENT CAPACITY UNIT: KIP FEET

  DETAILS:              CAPACITY    RATIO     LOC     LOAD CASE:   CRITERIA:
 
  TENSION:                15.719     0.000     0.000      1         Eq. D2-1
  MAJOR COMPRESSION:      14.287     0.000     0.000      1         Sec. E1
  MINOR COMPRESSION:      14.287     0.000     0.000      1         Sec. E1
  MAJOR SHEAR:             4.716     0.048     0.000      1         Eq. G6-1
  MINOR SHEAR:             4.716     0.000     0.000      1         Eq. G6-1
  TORSION:                 8.307     0.288     0.000      1         Eq. H3-1
  MAJOR FLEXURE YIELD:  7.35E-01     0.000     0.000      1         Sec. F1
  MINOR FLEXURE YIELD:  7.35E-01     0.959     0.000      1         Sec. F1
  FLEX COMP INTER:        N/A        0.959     0.000      1         Eq. H1-1b
  FLEX TENS INTER:        N/A        0.959     0.000      1         Eq. H1-1b
  FLEX TEN TOR SHEAR:     N/A        0.083     0.000      1         Eq. H3-6
  FLEX COMP TOR SHEAR:    N/A        0.083     0.000      1         Eq. H3-6

Below is my STAAD input file

STAAD SPACE
START JOB INFORMATION
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 8 0 0; 3 16 0 0; 4 -2 2.25 0; 5 0 2.25 0; 6 8 2.25 0; 7 16 2.25 0;
8 -2 3.75 0; 9 0 3.75 0; 10 8 3.75 0; 11 16 3.75 0;
MEMBER INCIDENCES
1 1 5; 2 2 6; 3 3 7; 4 5 4; 5 5 6; 6 6 7; 7 4 8; 8 5 9; 9 6 10; 10 7 11;
11 9 8; 12 9 10; 13 10 11;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.176e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 1.2e-005
DAMP 0.03
G 1.64674e+006
TYPE STEEL
STRENGTH FY 5288.19 FU 8517.08 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TO 3 8 TO 10 TABLE ST PIPS15
4 TO 7 11 TO 13 TABLE ST PIPS12
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 TO 3 FIXED
*
LOAD 1 LOADTYPE Live  TITLE GUARD
JOINT LOAD
8 FZ 0.2
PERFORM ANALYSIS
*
PARAMETER 1
CODE AISC UNIFIED 2010
METHOD ASD
TRACK 1 ALL
FYLD 5040 ALL
CHECK CODE MEMB 1
*
FINISH