RIMS Update - Bridge Data Guidelines for Asset Management of Road Bridges

Bridge Data Guidelines for Asset Management of Road Bridges

Simon Bush: Opus ConsultantsPiotr Omenzetter: University of Auckland

Theuns F. P. Henning: University of AucklandPeter McCarten: Opus Consultants

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

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

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.

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

The underlying frameworkData Collection Level

Core Asset Management Advanced Asset Management

Core

Basic functionality of asset management achieved including valuations and prioritisation of annual budget

Core data may be insufficient for advanced asset management

IntermediateCore asset management may be insufficient for as long term planning cannot be undertaken

Used for network level analysis, forecasting condition/risk and investment level scenario analysis

Advanced

Core asset management may be insufficient as long-term planning and detailed analysis cannot be undertaken

Used for further analyses/ at a detailed level, such as diagnostics. Used in the development of more accurate intervention measures/costs

Outcome: criticality and risk diagram

Data collection tools available to bridge asset managers

AHB, 3.0, 20.6

NM, 3.0, 8.2SC, 2.0, 10.6

MH, 2.0, 15.6GB, 2.0, 16.6 WRB, 3.0, 17.2

MSLN, 1.0, 4.8

TSSR, 1.0, 8.8

LCNS, 1.0, 5.9SBNS, 1.0, 7.4

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Core Intermediate Advanced

Criticality Rating

Risk Rating

Risk – and criticality-diagram

Bridge data detailed in guidelineG

overnance/Policy Directives: G

overnment Strategic

Objectives

Recommended data for collection

Collection methods detailed in guideline

Data collection tools available to bridge asset managers

Strategy application: example

a) Auckland Harbour Bridge b) Newmarket Viaduct c) Small culvert on SH1 d) Small rural timber bridge

Strategy application: example

a) Auckland Harbour Bridge b) Newmarket Viaduct c) Small culvert on SH1 d) Small rural timber bridge

Performance criteriaCulvert Timber Bridge AHB Newmarket

Risk Cons. Risk Cons. Risk Cons. Risk Cons.

Structural safety 10.02

7.51

27.03

11.33

Hydraulic/geotech. safety 10.0 5.0 22.5 3.8Serviceability 5.0 1 5.0 1 12.0 2 7.5 2Functionality 15.0 2 5.0 1 18.0 2 7.5 2Aggregate: risk (RMS) / criticality (max cons.) 10.6 2 5.7 1 20.6 3 8.0 3

Data collection regime Intermediate Core Advanced Advanced

Asset management level Advanced Core Advanced Advanced

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

Questions?More Information?See NZTA website for the data collection and monitoring [email protected]