HOME 20" DOUBLE TEE
Composite with 2½" Concrete Topping (f'c = 4000 psi)
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20 inch Topped Double Tee X-Section

SECTION PROPERTIES
I  = 26389  in4 Ztc  = 6151  in3 Zif  = 6707  in3 Zbc  = 1643  in3
w  = 86  psf Ytc  = 6.43  in Yif  = 3.93  in Ybc  = 16.07  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                
6 (straight) 157 100 62 28                          
6 (harped) 176 114 73 40                          
8 (straight) 212 141 90 51 22                        
8 (harped) 250 170 117 74 42                        
10 (straight) 257 173 111 68 36                        
10 (harped) 319 222 157 106 68 39                      
12 (harped) 384 270 195 136 92 59 34                    
14 (harped) 443 315 230 164 115 78 50 28                  
16 (harped) 497 356 261 189 135 95 64 40 20                
18 (harped) 546 392 290 211 154 110 77 51 30                

NOTES:

  1. The standard top flange reinforcement is WWF 8x4-W2.9/W2.9, and the maximum safe uniform load on the flange with this reinforcement, without the topping, is 80 psf. The maximum safe concentrated load without the topping is 500 lbs.
  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).