HOME 30" THICK-FLANGE DOUBLE TEE
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30 inch Double Tee X-Section

SECTION PROPERTIES
I  = 62255  in4 Zt  = 7724  in3 Zb  = 2838  in3 A  = 843  in2
W  = 91  psf Yt  = 8.06  in Yb  = 21.94  in    


ALLOWABLE SUPERIMPOSED LOAD (in pounds per square foot)
SIMPLE SPAN (in feet)
Number of ½" Ø strands per tee 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86    
6 (straight) 171 117 78 50 29                        
6 (harped) 186 128 87 58 36                        
8 (straight) 239 170 121 85 58 38 22                    
8 (harped) 268 192 138 100 70 48 30                    
10 (straight) 300 217 159 116 84 60 40 23                  
10 (harped) 347 254 188 140 104 77 55 37 21                
12 (harped) 424 314 236 179 137 104 79 56 37 22              
14 (harped) 498 371 282 217 168 131 99 74 53 36 22            
16 (harped) 569 426 326 253 198 155 120 91 69 50 34 21          
18 (harped) 636 479 368 288 226 177 139 108 83 63 46 31          
20 (harped)   529 408 320 251 199 157 124 97 75 56 41 28        
22 (harped)       349 276 219 175 139 110 87 67 50 36 24      
24 (harped)           238 191 153 123 97 76 59 44 31 20    
26 (harped)               166 134 108 85 67 51 37 26    

NOTES:

  1. The minimum top flange reinforcement is WWF 4x4-W2.9/W2.9, and the maximum safe uniform load on the flange with minimum reinforcement is 180 psf. Additional flange reinforcement will be required for loads in excess of 180 psf.
  2. Interpolation between values shown is acceptable.  Do not extrapolate values into the blank spaces of the table.
  3. These Span-Load Tables are intended as an aid to preliminary sizing. Sound engineering judgement is required for the application of this information to specific design cases.
  4. Values in the lower left of the table in bold type represent conditions where shear reinforcement is required. See SHEAR in "Design Criteria..." for discussion.
  5. Values in the lower left of the table in bold red type represent conditions where (1) shear reinforcement is required and (2) top flange tension reinforcement is required in addition to the standard flange mesh.
  6. See "Design Criteria..." for definitions of HIGHLIGHTING. Highlighting not visible on printed copy (screen only).