HOME 28" DOUBLE TEE
Composite with 2½" Concrete Topping (f'c = 4000 psi)
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28 inch Topped Double Tee X-Section

SECTION PROPERTIES
I  = 60971  in4 Ztc  = 10339  in3 Zif  = 9609  in3 Zbc  = 2816  in3
w  = 96  psf Ytc  = 8.84  in Yif  = 6.34  in Ybc  = 21.66  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        
6 (straight) 169 114 75 47 26                        
6 (harped) 184 125 84 54 32                        
8 (straight) 236 166 117 81 52 26                      
8 (harped) 266 189 135 96 67 39                      
10 (straight) 296 213 154 112 74 45 22                    
10 (harped) 344 250 184 136 100 67 41 20                  
12 (harped) 418 308 231 174 131 93 64 40 21                
14 (harped) 490 363 275 211 161 119 86 59 37                
16 (harped) 558 416 317 245 190 143 107 77 53 33              
18 (harped) 621 466 357 278 217 166 126 94 68 46 29            
20 (harped)   513 394 308 243 188 145 110 82 59 40 23          
22 (harped)       337 267 208 162 125 95 71 50 33          
24 (harped)           227 178 139 108 81 60 41 26        
26 (harped)               152 118 91 68 49 32        

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).