Civil Engineering Reference
In-Depth Information
Figure 11.10 CPM network solution to example 11.2
and
σ
E
=
√
3
.
14
=
1
.
77 days
To find the duration with a minimum level of confidence of 95%, find the
Z
values associated with the probability of 0.95. From the table, this
Z
value is
1.645 and
T
S
=σ
E
Z
+
T
E
=
1
.
771
.
645
+
55
.
50
=
58
.
41 days
Applying the same calculations to path ABDG, we find
T
E
=
5
.
00
+
12
.
00
+
17
.
33
+
22
.
00
=
56
.
33days
V
E
=
0
.
11
+
0
.
44
+
1
.
78
+
21
.
78
=
24
.
11
σ
E
=
√
24
.
11
=
4
.
91days
and
T
S
=σ
E
Z
+
T
E
=
4
.
911
.
645
+
56
.
33
=
64
.
41days
Applying the same calculations again to path ABEHI, we find
T
E
=
5
.
00
+
12
.
00
+
16
.
67
+
12
.
27
+
9
.
00
=
54
.
83days
V
E
=
0
.
11
+
0
.
44
+
11
.
11
+
0
.
69
+
0
.
11
=
12
.
47
σ
E
=
√
12
.
47
=
3
.
53days
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