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 Check that vu - vc >/= vc
vu - vc = 202.7 - 111.7
= 91 < vc, therefore use vc
Assume ss = 10 in
Av = 111.7 x 18 x 10/(0.85 x 60,000)
= 0.394 in2
Use No. 4 tie
Av = 0.40 in2
(17) Minimum tie reinforcing area:
Av (min) = 0.0015 bss
= 0.0015 x 18 x 10
= 0.27 in2 < 0.40 in2
O.K.
Maximum tie spacing:
4 [phi] (f'c)1/2 = 4 x 0.85 x (4,000)1/2
= 215 psi > vc = 111.7 > vu - vc = 91.0
psi
smax = d/2
27.125
=
2
= 13.56 in > 10 in
O.K.
(18) Determine required resistance for rebound, r -, from
Figure 6-8 of NAVFAC P-397.
Xm
r -/ru = 0.75 for T/TN = 2.40 and = 17.0
XE
Required r - = 0.75 x 1,065.85
= 799.4 lb/in
(19) Assume A -s = 1.64 in2, two No. 7 + one No. 6.
(20) Repeat Steps (3) to (5)
p
-N
at
support
=
0.0034 > 200/fy
p
-p
at
mid-span
=
0.0033 = 200/fy
M
-N
at
support
=
2,859,500 in-lbs
M
-p
at
midspan
=
2,913,600 in-lbs
r -
=
801.8 lb/in > 799.4 lb/in
2.08-114
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