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 Use No. 3 stirrups at 11 inches in each stem
Av > 0.0015 bs = .0015 x 4.75 x 11
= 0.08 in2 < 0.22 in2
O.K.
Calculate shear at support:
Vd = ruL/2
= 124(40 x 12)/2
= 29,760 lb
Calculate maximum allowable direct shear
Vd = 0.18 f'dcbwd
= 0.18 (5,500)4.75(22.0)
= 103,455 lb > 29,760 lb
O.K.
(17) Check section for service loads.
This section as designed for blast loads is shown in
Figure 70. Using the PCI design handbook and the latest
ACI code, the section must be checked to make sure it is
adequate for service loads.
2.08-265
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