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1
Ministry of Transport, Public Works
and Water Management
2
New Developments in Life-Cycle Cost Analysis of Civil Infrastructure
Leo Klatter
August 20th 2003
3
Presentation Outline
• National Water and Road Network
• Life-Cycle Based Asset Management
• Case Study Main Road Network
• Conclusions
4
National Water Systems the
Netherlands• 724 km canals
• 828 km navigable rivers
• 63.360 km2 water area• Object categories
– Canal, river beds– Dikes, embankments– Structures – Water– Facilities
5
Structures in NL Water Systems
Structure type NumberAsset size paramater
Replacement value [M€]
Bridges (fixed) 156 16.628 m1 932
Bridges (moveable) 66 2.754 m1 350
Pumping stations 26 501 m3/s 241
Storm surge barriers 4 3.780 m1 4.151
Sluices 15 17.980 m3/s 1.438
Shipping locks 143 4.170.417 m3 5.700
Weirs 20 1.162 m3 532Total 430 13.344
6
Age Distribution Structures
0
5
10
15
20
25
30
35
40
45
Nu
mb
er o
f st
ruct
ure
s
< 19
00
1901
-190
5
1906
-191
0
1911
-191
5
1916
-192
0
1921
-192
5
1926
-193
0
1931
-193
5
1936
-194
0
1941
-194
5
1946
-195
0
1951
-195
5
1956
-196
0
1961
-196
5
1966
-197
0
1971
-197
5
1975
-198
0
1981
-198
5
1986
-199
0
1991
-199
5
1996
-200
0
2001
-200
5
Year of construction
Bridges (fixed) Bridges (moveable) Pumping stations Storm surge barriersSluices Shipping locks Weirs
7
Main Road Network the
Netherlands• 3200 km road, of which 2300 km
motorway
• Object categories
– pavements
– structures
– traffic facilities
– environmental assets
8
Structures in NL Road NetworkType of structure Number Deck area Replacement
value
[m2] [M Euro]
Concrete bridge 3.131 3.319.002 6.559 Steel bridge (fixed) 88 301.997 600 Moveable bridge 43 347.876 1.101 Tunnel 14 475.228 1.710 Aqueduct 7 86.491 235 Total 3.283 4.530.593 10.205
Replacement Value – Year of
Construction
0,0
0,2
0,4
0,6
0,8
1,0
1,2
1,4
1,6
1,8
2,0
billion
Eu
ro
< 1
930
30-3
5
36-4
0
41-4
5
46-5
0
51-5
5
56-6
0
61-6
5
66-7
0
71-7
5
76-8
0
81-8
5
86-9
0
91-9
5
96-2
000
year of construction
Concrete bridges Steel bridges Movable bridges Tunnel Aqueduct
10
Management Challenges
• Ageing structures
– Maintenance cost increase
– Rehabilitation and improvement necessary
– Replacement comes in sight
• User demands increase
• Limited resources
• Accountability and efficiency
11
Life-Cycle Based Asset Management USA Federal Highways Administration (FHWA)
• Customer satisfaction and return on
investment
• Comprehensive; all asset classes of network
• Record value long-lived infrastructure
Asset management;
Life-Cycle Costing in broader context
12
Asset Management
System Performance:Engineering – Cost-Efficient and EffectiveEconomics – Optimal Resource AllocationBusiness Practices -Process Improvement
Business Practices
EngineeringEconomics
13
EngineeringDesign
• Safety, reliability; design life time
• Load < > strength
Construction quality
• Materials
Preservation
• Maintenance strategy
• Condition
14
Economics
Life-cycle cost analysis• Maintenance• Replacement• User cost
Optimisation
Return on investments
Financial strategies
15
Business Practices
Determines costs and performance to high
extend!
• Strategic planning
• Operational planning
– Inspections
– Prioritization
• Data systems
=> Reliable models are essential tools
16
Case Main Road Network
• Maintenance cost
• Strategic plan
• Operational programs
• Replacement
17
Bridge Elements
Joint
Bridge deck / PavementMain
carrying element
bearing
Guard rail
Railing
Abutment Pier
Guard rail
18
Data for a Typical Bridge (< 200 m)Bridge data Width
Length
Deck area
Replacement value
Lifetime
16 m
54 m
864 m2
1.7 * 106 €
68 years
Replacement cost elements
(exchangeable elements)
Pavement
Joints
Bearings
Guard rail
Railing
39,000 €
44,000 €
145,000 €
14,000 €
6,000 €
Total 248,000 €
19
Maintenance Strategy of Elements• Functional demands
• Deterioration process
• Measures
– Type / extend
– Intervals
– Cost
• Inspections
Maintenance Costs of a
Typical Bridgemaintenance cost of a concrete highway bridge
0
50
100
150
200
250
1-5 6-1011-15
16-2021-25
26-3031-35
36-4041-45
46-5051-55
56-6061-65
66-70
Age (year)
Co
st
(K€
)
routine maintenance inspections concreterailing guard rail pavementjoints bearings
Annual cost 14 €/m2
21
Annual Maintenance Cost (Network)
annual
Type of structure Number maintenance
cost
[M Euro]
Concrete bridge 3.131 37 Steel bridge (fixed) 88 7 Moveable bridge 43 10 Tunnel 14 13 Aqueduct 7 1 Total 3.283 68
22
Breakdown of Road Management
Costs (variable)
pavements45%
structures31%
traff ic facilities8%
environmental assets
4%
traff ic management
systems11%
exploitation1%
23
Strategic Document Needed
Transparent budget estimate forms start of
discussion
24
Strategic Document
10-page management summary
Content:
– Structure stock and its functionality
– Maintenance strategy
– Basic maintenance level
– Options
– Program and budget
25
Basic Maintenance Level
Tra
ffic
safe
ty
En
vir
on
men
tal
qu
alit
y
Use
r co
mfo
rt
Ap
peara
nce
Mob
ility
Qualit
y
level minimu
m
26
Operational practice
• Life-cycle cost based on maintenance
strategy for element types
• Standard plan customised to individual
bridge
• Update with inspection results
Operational maintenance
program
27
Operational maintenance program
Maintenanceexecution
Adjusting the maintenance plan
Inspection
Clustering and optimization
Decomposition / maintenance plan
End of service life
Road management
Operational program
Bridgemanagement
Actual budgetneed
Strategic budget need
Position strategic document
Maintenanceexecution
Adjusting the maintenance plan
Inspection
Clustering and optimization
Decomposition / maintenance plan
End of service life
29
Annual Maintenance Budget (variable)
0
50
100
150
200
250
300
350
400
450
strategicdocument
needed 2003/4 available budget
Mai
nte
nan
ce c
ost
[M
Eu
ro]
total
Other cat.
structures
30
“To replace or not to …..”
Replace, rehabilitate or maintain
Decision based on
• Safety
• Functionality
• Economics
• Available budgets
Forecasted Replacement CostVerwachte vervangingskosten -
Scenario ontwerplevensduur en functionele levensduur
0
200
400
600
800
1.000
1.200
1.400
Tijd
Ve
rvan
gin
gsk
os
ten
(in
mil
joe
ne
n e
uro
's)
verwachting basis
verwachting praktijk
Design
Practice
Repla
cem
ent
cost
M E
uro
Year
32
Research items• Integration of reliability and condition
analysis using life-cycle cost approach=> Beyond “living apart together”
• Dealing with uncertainty in inspections=> Modelling inspection strategy
• Use of inspections for prediction=> Matching strategy and reality
• Modelling total life-cycle cost of structure stock=> Merging maintenance and replacement
ColophonMinistry of Transport, Public Works and
Water Management
Civil Engineering Division