RIMS Forum 22 March 2012 by Simon Bush Opus

1. Bridge Data Guidelines for Asset
Management of Road Bridges
Simon Bush: Opus Consultants
Piotr Omenzetter: University of Auckland
Theuns F. P. Henning: University of Auckland
Peter McCarten: Opus Consultants

2. Our role as asset managers
• How do you prove you are contributing to national strategic
outcomes?
• How do you prove you are achieving value from money from
bridge management funding?
• Why? Our role is to ensure the assets we manage provide for
the nations needs and therefore support the economy
• How? Through the use of an advanced asset management
approach

3. It is important to get it right
• Close to 18000 bridges nationally (circa 4500 on state
highways and 13500 on Local roads).
• On average a bridge every 5km nationally and every 2.5km
on state Highways. New Zealand therefore functions on its
bridges.
• Aging local bridge stock

4. New Zealand bridge asset management
• NZGAO 2003: Limited evidence of an advanced asset
management approach
• USGAO 2008: The bridge program does not fully align with GAO’s
principles… …in that the program lacks focus, performance
measures. For example, the program’s statutory goals are not
focused on a clearly identified federal or national interest.
• NZGAO 2010: As asset information improves over time, there is a
need to ensure the information is cost-effective to collect, and is
as complete and up to date as possible, and remains useful.

5. New Zealand benchmark survey
• Areas of innovation
• Risk based inspections
• Changes to the visual inspection programme
• Areas of good practice
• Compliance with standards/expectations
• Good level of inventory data
• Area for improvement
• Understanding of bridge performance and strategic outcomes
• Performance data collected, but not generally stored
• Data management
• Reliance on visual inspections
• Knowledge and use of other forms of data collection

6. The underlying framework
Data
Collection Core Asset Management Advanced Asset Management
Level
Basic functionality of asset
management achieved including Core data may be insufficient for
Core
valuations and prioritisation of advanced asset management
annual budget
Core asset management may be Used for network level analysis,
Intermediate insufficient for as long term forecasting condition/risk and
planning cannot be undertaken investment level scenario analysis
Core asset management may be Used for further analyses/ at a
insufficient as long-term planning detailed level, such as diagnostics.
Advanced
and detailed analysis cannot be Used in the development of more
undertaken accurate intervention measures/costs

7. Outcome: criticality and risk diagram
40.0
35.0 Risk Rating
30.0
25.0
Core Intermediate Advanced
20.0 AHB, 3.0, 20.6
GB, 2.0, 16.6 WRB, 3.0, 17.2
15.0 MH, 2.0, 15.6
10.0 SC, 2.0, 10.6
TSSR, 1.0, 8.8 NM, 3.0, 8.2
SBNS, 1.0, 7.4
LCNS, 1.0, 5.9
5.0 MSLN, 1.0, 4.8
Criticality Rating
0.0
0.0 0.5 Data collection tools available to bridge asset2.0
1.0 1.5 managers 2.5 3.0
Risk – and criticality-diagram

8. Bridge data detailed in guideline
Governance/Policy Directives: Government Strategic
Objectives
Recommended data for collection

9. Collection methods detailed in guideline
Data collection tools available to bridge asset managers

10. Strategy application: example
a) Auckland Harbour Bridge b) Newmarket Viaduct c)
Small culvert on SH1 d) Small rural timber bridge

11. Strategy application: example
Culvert Timber Bridge AHB Newmarket
Performance criteria
Risk Cons. Risk Cons. Risk Cons. Risk Cons.
Structural safety 10.0 7.5 27.0 11.3
2 1 3 3
Hydraulic/geotech. safety 10.0 5.0 22.5 3.8
Serviceability 5.0 1 5.0 1 12.0 2 7.5 2
Functionality 15.0 2 5.0 1 18.0 2 7.5 2
Aggregate: risk (RMS) /
10.6 2 5.7 1 20.6 3 8.0 3
criticality (max cons.)
Data collection regime Intermediate Core Advanced Advanced
Asset management level Advanced Core Advanced Advanced
a) Auckland Harbour Bridge b) Newmarket Viaduct c)
Small culvert on SH1 d) Small rural timber bridge

12. Conclusion
• Asset managers have new challenges going forwards
• Have to adopt new technology
• Have to start to understand their asset in greater detail
• They have to do this if the bridges are to last 100 years and
economically sustainable outcome is to be achieved

13. Questions?
More Information?
See NZTA website for the data
collection and monitoring strategy
Simon.bush@opus.co.nz