Geology Reference
In-Depth Information
Figure 8. Time-dependant median values of fragility curves obtained for the two -span bridges with the
column height of 10 m: (a) at least slight damage state; (b) at least moderate damage state; (c) at least
extensive damage state; (d) complete damage state
n
pier cost can be estimated by assuming $4 per kg
of steel and $840 per m
3
of concrete according to
Caltrans contract cost data (2008). The average
total construction cost of short-, medium-, and
long-span bridges under study can be seen in
Table 5. Their inspection and maintenance costs
as well as their failure costs will be discussed in
the upcoming sections.
∑
1
C
=
S i
z(
∆
t
(15)
IN
i
=
where
S
is the cost of each inspection,
n
, the num-
ber of maintenance intervals, and
z
, the discount
factor from Equation 14. It can be seen that by
increasing the number of inspections,
n
, during
the life-cycle of the bridge, the inspection cost
rises accordingly. For the bridges under study,
the inspection cost is assumed to equal 0.5% of
the construction cost. The maintenance cost over
a structure's life span can be expressed as:
6.1. Inspection and Maintenance
Costs
The cost of inspection and maintenance is expected
to be incurred at regular time intervals, Δ
t
. The
inspection cost is calculate as:
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