Rebar Estimation Class: 17 (Slab on Grade) Part - 2

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  Slab Bolster & Slab Bolster Upper   Slab Bolster height = 2”   Length of Slab Bolster = 5+4 = 9’- 0”  Number of Slab Bolster = 200/9  = 22.22                                            = 23+1 = 24            No. of SB   =  150 -  (2 X ½ Spacing)                                          Spacing                             =  150  -   4                                       4                                            =  146 / 4                             =  36.5 + 1  = 38                         Total number of SB =  24 X 38                                   =  720 Nos.   Total linear feet = 720 X 5                            = 3600 L ft     Required = 720 Nos. 2” Height of SB (5’-0”) Length The total length of the Beam Bolster 3600’- 0” L ft         Individual high chair  ( I H C )            No. of IHC   =  200 -  (2 X ½ Spacing)                                          Spacing                             = 
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Rebar Estimation Class :14 (Grade Beam Part - 3)

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 Grade Beam

 

Reinforcement calculation

 

Beam length = 400’-0” lft

Lap length    = 2’-6” lft

Cover           = 3” inches

Stock length = 40’-0” lft

2#6 Continuous Top & Bottom

 

Step 1  = 400’-(2*3”)

            = 399’-6”

            = 399’-6”/40’-0”

            = 9.98  round down = 9               [9]

 

 

Step 2  = 9’-0” X 2’-6”

            = 22’-6”                     (9 X 40’) = 360’-0”

 

 

 

Step 3  = 399’-6” + 22’-6”

             = 422’-0”

             = 422’-0” – 360’-0”

             = 62’-0”

 

Step 4  = 62’-0” – 40’-0”                      [1]

            = 22’-0”

            = 22’-0” + 2’-6”

            = 24’-6”

 

 

           2 #5 Cont T&B   (10X2X2 = 40)  (40 Bars  40’-0” lft)

           2#5 odd T&B      (2 X 2 = 4)         (4 Bars 24’-6” lft)

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