HOME 22" THICK-FLANGE DOUBLE TEE
Next deeper size,   Next shallower size,   Thin-flange double tee,   Design criteria for the span load table


22 inch Double Tee X-Section

SECTION PROPERTIES
I  = 26782  in4 Zt  = 4666  in3 Zb  = 1647  in3 A  = 746  in2
W  = 81  psf Yt  = 5.74  in Yb  = 16.26  in    


ALLOWABLE SUPERIMPOSED LOAD (in pounds per square foot)
SIMPLE SPAN (in feet)
Number of ½" Ø strands per tee 26 30 34 38 42 46 50 54 58 62              
6 (straight) 158 102 65 38                          
6 (harped) 177 117 76 47 27                        
8 (straight) 214 144 98 65 41 21                      
8 (harped) 252 173 120 82 55 34                      
10 (straight) 261 179 125 86 56 34                      
10 (harped) 323 226 161 116 82 55 34                    
12 (harped) 390 276 200 147 105 74 50 32                  
14 (harped) 453 323 237 174 127 93 66 45 28                
16 (harped) 511 367 268 199 148 110 80 57 39 24              
18 (harped) 564 404 297 221 166 125 93 68 49 32              

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).