Page 110 - Trenchless Technology Piping Installation and Inspection

76 Cha pte r T w o

a. Determine load
w × H × R
q = 0 433 × H + s w + W
.
t w s
144
⎛ H ⎞
R = 10 33–. × ⎜ w ⎟
w
⎝ H s ⎠
R = 0.835
w
w = 120 pcf
1. Live load
a. Concentrated
×
033 × C × P F
.
W = sc sc
sc
12 × D
where W = concentrated live load, psi
sc
P = concentrated load, lb
F = impact factor (concentrated)
sc
C = load influence coefficient (concentrated)
sc
D = inside diameter of existing pipe (or liner pipe outside
diameter), in.
b. Distributed
C ××
p F
W = sd sd
sd
144
where W = distributed live load, psi
sd
p = applied surface load, psf
F = impact factor (distributed)
sd
C = load influence coefficient (distributed)
sd
D = inside diameter of existing pipe (or outside diameter), in.
Concentrated L.L P = 16,000 lb
C = 0.03826 (Table 2.12)
sc
F = 1.00
sc
Distributed L.L P = 0 psf
C = 0.000 (Table 2.12)
sd
F = 0.00
sd
.
,
.
= 035.
W = 0 33 × 0 03826 × 16 000 × 1 psi
sc
× 48
12
.
W = 0 000 × 0 × 0 = 000. psi
sd 144
W = W + W = 0.35 psi
s sc sd
2. Total external load
.
.
.
q = 0 433 × 8 00 + 120 × 16 × 0.835 + 035
t
144
q = 14.90 psi
t